Transparent floor-background which makes floor black.

.gitignore

@@ -1,4 +1,5 @@
 .settings
+.DS_store
 .gradle
 .idea
 bin
@@ -8,6 +9,7 @@ nbandroid
 private
 build
 app/src/main/res/values/version.xml
+app/release
 compiler/compiler.obj
 compiler/compiler.exe
 compiler/test/compiler.exe

app/.gitignore

@@ -0,0 +1 @@
+/build

app/build.gradle

@@ -1,11 +1,15 @@
-apply plugin: 'com.android.application'
+plugins {
+    id 'com.android.application'
+}
+
+apply plugin: "androidx.navigation.safeargs"
 
 //
 //	Creates version.xml	
 //
 task createVersionXML {
 	doLast {
-        def versionP = 'git describe --tags --long --dirty=-x --abbrev=8'
+        def versionP = 'git describe --tags --long --dirty=-x --always --abbrev=8'
 						.execute()
 		versionP.waitFor()
         def version = versionP.text.trim()
@@ -35,64 +39,64 @@ preBuild.dependsOn createVersionXML
 //
 //	Convert SVG images from art directory into PNG files.
 //
-task generateDrawablesFromArt {
+//task generateDrawablesFromArt {
-	doLast {
+//	doLast {
-		def buildDir = (new File(project.buildDir,'art')).toString()
+//		def buildDir = (new File(project.buildDir,'art')).toString()
-        def p = ('make -C app/src/main/art RES=../res TMP='+buildDir).execute()
+//        def p = ('make -C app/src/main/art RES=../res TMP='+buildDir).execute()
-		p.consumeProcessOutput()
+//		p.consumeProcessOutput()
-		p.waitFor()
+//		p.waitFor()
-		if ( p.exitValue() )
+//		if ( p.exitValue() )
-			throw new GradleException("Generation of art failed.")
+//			throw new GradleException("Generation of art failed.")
-	}
+//	}
-}
+//}
-preBuild.dependsOn generateDrawablesFromArt
+//preBuild.dependsOn generateDrawablesFromArt
 
 android {
-    compileSdkVersion 10
+    compileSdk 31
-    buildToolsVersion "21.1.1"
 
     defaultConfig {
-        applicationId "org.vostan.sokoban"
+        applicationId "org.vostan.banvor"
-        minSdkVersion 10
+        minSdk 21
-        targetSdkVersion 14
+        targetSdk 31
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
-    apply from: new File(getRootDir(),'/.secret.gradle')
+
     buildTypes {
         release {
-            runProguard true
+            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
-            signingConfig signingConfigs.sokoban_release
-        }
-
-        debug {
-            applicationIdSuffix ".debug"
         }
     }
-
+    compileOptions {
-    sourceSets {
+        sourceCompatibility JavaVersion.VERSION_1_8
-        /*
+        targetCompatibility JavaVersion.VERSION_1_8
-        main {
-            java.srcDirs = ['src']
-
-            resources.srcDirs = ['src']
-            aidl.srcDirs = ['src']
-
-            renderscript.srcDirs = ['src']
-
-            res.srcDirs = ['res']
-            assets.srcDirs = ['assets']
-
     }
-        */
+    buildFeatures {
-        debug {
+        viewBinding true
-            main.manifest.srcFile "src/main/AndroidManifest-debug.xml"
-        }
-        androidTest.setRoot("src/tests")
     }
 }
 
-//repositories {}
-
 dependencies {
-    compile 'com.android.support:support-v4:18.0.0'
+    def nav_version = "2.3.5"
+
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'com.google.android.material:material:1.4.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+
+    // Java language implementation
+    implementation "androidx.navigation:navigation-fragment:$nav_version"
+    implementation "androidx.navigation:navigation-ui:$nav_version"
+    // Feature module Support
+    implementation "androidx.navigation:navigation-dynamic-features-fragment:$nav_version"
+    // Testing Navigation
+    androidTestImplementation "androidx.navigation:navigation-testing:$nav_version"
+    // Jetpack Compose Integration
+    implementation "androidx.navigation:navigation-compose:2.4.0-alpha10"
 }
+

app/proguard-project.txt

@@ -1,20 +0,0 @@
-# To enable ProGuard in your project, edit project.properties
-# to define the proguard.config property as described in that file.
-#
-# Add project specific ProGuard rules here.
-# By default, the flags in this file are appended to flags specified
-# in ${sdk.dir}/tools/proguard/proguard-android.txt
-# You can edit the include path and order by changing the ProGuard
-# include property in project.properties.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# Add any project specific keep options here:
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}

app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/org/vostan/banvor/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package org.vostan.banvor;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("org.vostan.banvor", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

@@ -1,30 +1,24 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-      package="org.vostan.sokoban"
+    package="org.vostan.banvor"
-      android:versionCode="0x00010001"
     android:versionName="@string/git_version">
-    <uses-sdk android:minSdkVersion="10" 
+
-			  android:targetSdkVersion="14"/>
+    <application
-    <application android:label="@string/app_name" 
+        android:name=".App"
         android:icon="@drawable/icon"
-				 android:name="org.vostan.sokoban.App"
-				 android:theme="@android:style/Theme">
-        <activity	android:name="org.vostan.sokoban.menu.MainActivity"
         android:label="@string/app_name"
-					android:configChanges="keyboardHidden|orientation"
+        android:roundIcon="@drawable/icon"
-					android:screenOrientation="portrait" >
+        android:theme="@style/Theme.Banvor">
+        <activity
+            android:name=".WelcomeActivity"
+            android:exported="true"
+            android:label="@string/title_activity_welcome"
+            >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity 	android:name="org.vostan.sokoban.play.PlayActivity"
-					android:label="@string/play_activity"
-					android:configChanges="keyboardHidden|orientation"
-					android:screenOrientation="portrait" >
-	        <meta-data
-	            android:name="android.support.PARENT_ACTIVITY"
-	            android:value="org.vostan.sokoban.MainMenu" />
-        </activity>
     </application>
+
 </manifest>

app/src/main/art/floor.svg

@@ -2,23 +2,23 @@
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 <svg
-   xmlns:dc="http://purl.org/dc/elements/1.1/"
-   xmlns:cc="http://creativecommons.org/ns#"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:xlink="http://www.w3.org/1999/xlink"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    width="500"
    height="500"
    id="svg3081"
    version="1.1"
-   inkscape:version="0.48.5 r10040"
+   inkscape:version="1.1.1 (c3084ef, 2021-09-22)"
    sodipodi:docname="floor.svg"
-   inkscape:export-filename="C:\Users\vahagnk\devel\_private\org.dyndns.vahagn.sokoban\res\drawable\goal.png"
+   inkscape:export-filename="/Users/vahagnk/devel/banvor/app/src/main/res/drawable/floor.png"
    inkscape:export-xdpi="90"
-   inkscape:export-ydpi="90">
+   inkscape:export-ydpi="90"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
   <defs
      id="defs3083">
     <linearGradient
@@ -61,7 +61,11 @@
        inkscape:label="Glow"
        inkscape:menu="Shadows and Glows"
        inkscape:menu-tooltip="Glow of object's own color at the edges"
-       color-interpolation-filters="sRGB">
+       color-interpolation-filters="sRGB"
+       x="-0.025040128"
+       y="-0.025040128"
+       width="1.0500803"
+       height="1.0500803">
       <feGaussianBlur
          id="feGaussianBlur3920"
          stdDeviation="5"
@@ -111,20 +115,21 @@
      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
      inkscape:zoom="0.83972969"
-     inkscape:cx="-95.341037"
+     inkscape:cx="458.48087"
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+     inkscape:cy="280.44739"
      inkscape:document-units="px"
-     inkscape:current-layer="layer5"
+     inkscape:current-layer="g134"
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      inkscape:snap-global="false"
-     inkscape:window-width="1920"
+     inkscape:window-width="1792"
-     inkscape:window-height="1018"
+     inkscape:window-height="1067"
-     inkscape:window-x="-8"
+     inkscape:window-x="0"
-     inkscape:window-y="-8"
+     inkscape:window-y="25"
      inkscape:window-maximized="1"
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      inkscape:showpageshadow="false"
-     showborder="true">
+     showborder="true"
+     inkscape:pagecheckerboard="true">
     <inkscape:grid
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@@ -141,22 +146,40 @@
         <dc:format>image/svg+xml</dc:format>
         <dc:type
            rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-        <dc:title />
       </cc:Work>
     </rdf:RDF>
   </metadata>
   <g
      inkscape:groupmode="layer"
      id="layer4"
-     inkscape:label="Back"
+     inkscape:label="White Background"
-     style="display:inline"
+     style="display:none"
      sodipodi:insensitive="true">
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-       style="fill:#ffffff;stroke:none;display:inline"
+       style="display:inline;fill:#ffffff;stroke:none"
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+  <g
+     inkscape:groupmode="layer"
+     id="g134"
+     inkscape:label="Black Background"
+     style="display:none"
+     sodipodi:insensitive="true">
+    <path
+       style="display:inline;fill:#ffffff;stroke:none"
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      inkscape:label="Tiles"
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app/src/main/art/lock.svg

@@ -2,23 +2,23 @@
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-   xmlns:svg="http://www.w3.org/2000/svg"
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-   xmlns:xlink="http://www.w3.org/1999/xlink"
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    version="1.1"
-   inkscape:version="0.48.5 r10040"
+   inkscape:version="1.1.1 (c3084ef, 2021-09-22)"
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    sodipodi:docname="lock.svg"
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    inkscape:export-xdpi="17.258801"
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+   inkscape:export-ydpi="17.258801"
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+   xmlns:xlink="http://www.w3.org/1999/xlink"
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+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
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@@ -332,7 +338,7 @@
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        inkscape:export-ydpi="90" />
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+       style="display:inline;fill:#d40000;fill-opacity:1;fill-rule:nonzero;stroke:none"
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@@ -341,7 +347,7 @@
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        inkscape:export-ydpi="90" />
     <path
-       style="fill:#d40000;fill-opacity:1;fill-rule:nonzero;stroke:none;display:inline"
+       style="display:inline;fill:#d40000;fill-opacity:1;fill-rule:nonzero;stroke:none"
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@@ -350,7 +356,7 @@
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     <path
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+       style="display:inline;fill:#d40000;fill-opacity:1;fill-rule:nonzero;stroke:none"
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@@ -359,7 +365,7 @@
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+       style="display:inline;fill:#d40000;fill-opacity:1;fill-rule:nonzero;stroke:none"
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@@ -368,7 +374,7 @@
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        inkscape:export-ydpi="90" />
     <path
-       style="fill:#d40000;fill-opacity:1;fill-rule:nonzero;stroke:none;display:inline"
+       style="display:inline;fill:#d40000;fill-opacity:1;fill-rule:nonzero;stroke:none"
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@@ -376,9 +382,4 @@
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-  <g
-     inkscape:groupmode="layer"
-     id="layer2"
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app/src/main/art/worker.svg

@@ -2,22 +2,22 @@
 <!-- Created with Inkscape (http://www.inkscape.org/) -->
 
 <svg
-   xmlns:dc="http://purl.org/dc/elements/1.1/"
-   xmlns:cc="http://creativecommons.org/ns#"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    width="500"
    height="500"
    id="svg3081"
    version="1.1"
-   inkscape:version="0.48.5 r10040"
+   inkscape:version="1.1.1 (c3084ef, 2021-09-22)"
    sodipodi:docname="worker.svg"
    inkscape:export-filename="C:\Users\vahagnk\devel\_private\org.dyndns.vahagn.sokoban\art\worker_select.png"
    inkscape:export-xdpi="90"
-   inkscape:export-ydpi="90">
+   inkscape:export-ydpi="90"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
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      id="defs3083">
     <inkscape:perspective
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      inkscape:pageshadow="2"
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-     inkscape:cx="-34.823458"
+     inkscape:cx="193.12855"
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+     inkscape:cy="285.93632"
      inkscape:document-units="px"
      inkscape:current-layer="layer3"
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-     inkscape:window-width="1920"
+     inkscape:window-width="1307"
-     inkscape:window-height="1018"
+     inkscape:window-height="969"
-     inkscape:window-x="-8"
+     inkscape:window-x="0"
-     inkscape:window-y="-8"
+     inkscape:window-y="25"
-     inkscape:window-maximized="1">
+     inkscape:window-maximized="0"
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+     inkscape:showpageshadow="false"
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@@ -63,7 +66,6 @@
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-        <dc:title />
       </cc:Work>
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   </metadata>

app/src/main/java/org/vostan/banvor/App.java

@@ -0,0 +1,51 @@
+package org.vostan.banvor;
+
+import android.app.Application;
+import android.content.SharedPreferences;
+import android.util.Log;
+
+import org.vostan.banvor.game.State;
+import org.vostan.banvor.model.PuzzleContainer;
+import org.vostan.banvor.model.IPuzzleSource;
+
+public class App extends Application
+{	
+	public static final String TAG = "Sokoban";
+	public static final String PREFS = "org.dyndns.vahagn.sokoban.prefs";
+	public static final int MIN_LEVEL = 1;
+
+	private static App mApp = null;
+	protected State gameState;
+	protected SharedPreferences prefs;
+
+	/*
+	 *
+	 */
+	@Override
+	public void onCreate()
+	{
+	    super.onCreate();
+	    mApp = this;
+
+	    PuzzleContainer pc = new PuzzleContainer();
+		gameState = new State(pc);
+		prefs = getSharedPreferences(PREFS, MODE_PRIVATE);
+
+		gameState.loadState(prefs);
+	}
+
+	public void storeGameState(){
+		 gameState.storeState(prefs.edit());
+	}
+
+	//
+	//	This is a singleton object.
+	//
+	public static App theApp() {
+	    return mApp;
+	}
+
+	public State state(){
+		return gameState;
+	}
+}

app/src/main/java/org/vostan/banvor/PuzzleBoardFragment.java

@@ -0,0 +1,129 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.vostan.banvor;
+
+import static org.vostan.banvor.App.theApp;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+
+import org.vostan.banvor.board.PuzzleControl;
+import org.vostan.banvor.databinding.FragmentPuzzleBoardBinding;
+import org.vostan.banvor.game.State;
+
+/**
+ *
+ */
+public class PuzzleBoardFragment extends Fragment
+{
+	private FragmentPuzzleBoardBinding binding;
+	private State gameState;
+
+
+	@Override
+	public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
+	{
+		gameState = theApp().state();
+		binding = FragmentPuzzleBoardBinding.inflate(inflater, container, false);
+		return binding.getRoot();
+	}
+
+	public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
+		super.onViewCreated(view, savedInstanceState);
+
+		int gameLevel = PuzzleBoardFragmentArgs.fromBundle(getArguments()).getLevel();
+		gameState.setCurrentLevel(gameLevel);
+
+		initAndShowCurrentPuzzle();
+
+		binding.gameBoard.setPuzzleControlLister(new PuzzleControl.PuzzleControlLister() {
+			@Override
+			public void onSolved() {
+				PuzzleBoardFragment.this.onSolved();
+			}
+
+			@Override
+			public void onLongPress() {
+			}
+
+			@Override
+			public void onTouch() {
+			}
+		});
+		binding.btnPrev.setOnClickListener((View.OnClickListener) view1 -> {
+			gameState.setCurrentLevel(gameState.getCurrentLevel()-1);
+			PuzzleBoardFragment.this.initAndShowCurrentPuzzle();
+		});
+		binding.btnNext.setOnClickListener((View.OnClickListener) view2 -> {
+			gameState.setCurrentLevel(gameState.getCurrentLevel()+1);
+			PuzzleBoardFragment.this.initAndShowCurrentPuzzle();
+		});
+		binding.btnReset.setOnClickListener((View.OnClickListener) view3 -> {
+			PuzzleBoardFragment.this.initAndShowCurrentPuzzle();
+		});
+		binding.btnUndo.setOnClickListener((View.OnClickListener) view4 -> {
+			createNextLevelDialog((d, w) -> {
+				gameState.advanceCurrentLevel();
+				initAndShowCurrentPuzzle();
+			}).show();
+		});
+	}
+
+	private void initAndShowCurrentPuzzle() {
+		int gameLevel = gameState.getCurrentLevel();
+		binding.levelNumber.setText(Integer.toString(gameLevel));
+		binding.gameBoard.setPuzzle(gameState.getCurrentPuzzle());
+	}
+
+	private void onSolved(){
+		//
+		//	Since the puzzle is solved, we need to unlock next level if still locked.
+		//
+		gameState.levelSolved(gameState.getCurrentLevel());
+		//
+		//	Bring a dialog for user to choose to continue or stop.
+		//
+//		DialogFragment df = new DialogFragment() {
+//			public Dialog onCreateDialog(Bundle savedInstanceState) {
+//				return createNextLevelDialog(new DialogInterface.OnClickListener(){
+//					public void onClick(DialogInterface d, int w){
+//						gameState.advanceCurrentLevel();
+//						initAndShowCurrentPuzzle();
+//					}
+//				});
+//			}
+//		};
+//		df.show(getChildFragmentManager(), null);
+		createNextLevelDialog((d, w) -> {
+			gameState.advanceCurrentLevel();
+			initAndShowCurrentPuzzle();
+		}).show();
+	}
+
+	@Override
+	public void onDestroyView() {
+		super.onDestroyView();
+		binding = null;
+	}
+
+	private Dialog createNextLevelDialog(DialogInterface.OnClickListener listener){
+		AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+		builder.setTitle("Congratulations! You Won!");
+		builder.setMessage( "Would you like to try the next puzzle?" );
+		builder.setPositiveButton("Yes, please.", listener);
+		// Create the AlertDialog object and return it
+		Dialog dlg = builder.create();
+		dlg.setCancelable(true);
+		return dlg;
+	}
+}

app/src/main/java/org/vostan/banvor/PuzzleListFragment.java

@@ -0,0 +1,197 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.vostan.banvor;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.navigation.fragment.NavHostFragment;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import android.widget.AdapterView;
+import android.widget.BaseAdapter;
+import android.widget.GridView;
+import android.widget.ImageView;
+
+import static org.vostan.banvor.App.theApp;
+
+import org.vostan.banvor.databinding.FragmentPuzzleListBinding;
+import org.vostan.banvor.game.State;
+
+/**
+ *
+ */
+class PuzzlesAdapter extends BaseAdapter
+{
+	private State gameState;
+	private Context context;
+	private int icon_size;
+	private int text_size;
+	private int text_x;
+	private int text_y;
+	private Bitmap lock_icon;
+	private Bitmap unlock_icon;
+	private Paint paint;
+
+	public PuzzlesAdapter(Context c)
+	{
+		super();
+
+		gameState = theApp().state();
+		context = c;
+		icon_size = (int)c.getResources().getDimension(R.dimen.puzzle_list_icon_size);
+		text_size = (int)c.getResources().getDimension(R.dimen.puzzle_list_number_size);
+		text_x = (int)c.getResources().getDimension(R.dimen.puzzle_list_number_x_coord);
+		text_y = (int)c.getResources().getDimension(R.dimen.puzzle_list_number_y_coord);
+
+		//
+		//	Load locked icon
+		//
+		Bitmap lock_icon_tmp = BitmapFactory.decodeResource( c.getResources(), R.drawable.lock );
+		lock_icon = Bitmap.createBitmap(icon_size,icon_size,Bitmap.Config.ARGB_8888);
+		Canvas lock_canvas = new Canvas(lock_icon);
+		lock_canvas.drawBitmap(lock_icon_tmp,
+				new Rect(0,0,lock_icon_tmp.getWidth()-1,lock_icon_tmp.getHeight()-1),
+				new Rect(0,0, icon_size, icon_size),
+				null);
+
+		//
+		//	Load unlock icon
+		//
+		Bitmap unlock_icon_tmp = BitmapFactory.decodeResource( c.getResources(), R.drawable.unlock );
+		unlock_icon = Bitmap.createBitmap(icon_size,icon_size,Bitmap.Config.ARGB_8888);
+		Canvas unlock_canvas = new Canvas(unlock_icon);
+		unlock_canvas.drawBitmap(unlock_icon_tmp,
+				new Rect(0,0,unlock_icon_tmp.getWidth()-1,unlock_icon_tmp.getHeight()-1),
+				new Rect(0,0,icon_size, icon_size),
+				null);
+
+		paint = new Paint();
+	}
+
+	@Override
+	public int getCount()
+	{
+		return gameState.getPuzzleCount();
+	}
+
+	@Override
+	public Object getItem(int position)
+	{
+		return null;
+	}
+
+	public int getPositionLevel(int position)
+	{
+		return position+1;
+	}
+
+	@Override
+	public long getItemId(int position)
+	{
+		return getPositionLevel(position);
+	}
+
+	// create a new ImageView for each item referenced by the Adapter
+	@Override
+	public View getView(int position, View convertView, ViewGroup parent)
+	{
+		ImageView imageView;
+		if (convertView == null)
+		{  // if it's not recycled, initialize some attributes
+			imageView = new ImageView(context);
+			imageView.setLayoutParams(new GridView.LayoutParams(icon_size, icon_size));
+			imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
+		}
+		else
+			imageView = (ImageView) convertView;
+
+		imageView.setImageBitmap(getIcon(position));
+		return imageView;
+	}
+
+	private Bitmap getIcon(int position)
+	{
+		paint.setColor( Color.WHITE );
+		paint.setTextSize( text_size );
+		paint.setTextAlign(Paint.Align.RIGHT);
+
+		int level = getPositionLevel(position);
+		Bitmap icon = ( gameState.isLocked(level) )
+				? lock_icon.copy(Bitmap.Config.ARGB_8888,true)
+				: unlock_icon.copy(Bitmap.Config.ARGB_8888,true);
+
+		Canvas canvas = new Canvas(icon);
+		canvas.drawText( Integer.toString(level), text_x, text_y, paint);
+		return icon;
+	}
+}
+
+
+/**
+ *
+ */
+public class PuzzleListFragment extends Fragment
+{
+	private FragmentPuzzleListBinding binding;
+	private PuzzlesAdapter puzzleGridAdapter;
+	private State gameState;
+
+	@Override
+	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
+	{
+		gameState = theApp().state();
+		binding = FragmentPuzzleListBinding.inflate(inflater, container, false);
+		return binding.getRoot();
+	}
+
+	@Override
+	public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
+		super.onViewCreated(view, savedInstanceState);
+
+		puzzleGridAdapter = new PuzzlesAdapter(getActivity());
+		binding.puzzleGrid.setAdapter(puzzleGridAdapter);
+
+		binding.puzzleGrid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
+			@Override
+			public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
+				int level = puzzleGridAdapter.getPositionLevel(position);
+				if (!gameState.isLocked(level)){
+					PuzzleListFragmentDirections.ActionPuzzleListFragmentToPuzzleBoardFragment action =
+					PuzzleListFragmentDirections.actionPuzzleListFragmentToPuzzleBoardFragment();
+					action.setLevel(level);
+					NavHostFragment.findNavController(PuzzleListFragment.this)
+							.navigate(action);
+				}
+			}
+		});
+	}
+
+	@Override
+	public void onResume()
+	{
+		super.onResume();
+		if ( binding != null && binding.puzzleGrid != null ) {
+			puzzleGridAdapter.notifyDataSetChanged();
+		}
+	}
+
+	@Override
+	public void onDestroyView () {
+		super.onDestroyView();
+		binding = null;
+	}
+}

app/src/main/java/org/vostan/banvor/WelcomeActivity.java

@@ -0,0 +1,77 @@
+package org.vostan.banvor;
+
+import android.os.Bundle;
+
+import com.google.android.material.snackbar.Snackbar;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+
+import androidx.navigation.NavController;
+import androidx.navigation.Navigation;
+import androidx.navigation.ui.AppBarConfiguration;
+import androidx.navigation.ui.NavigationUI;
+
+import org.vostan.banvor.databinding.ActivityWelcomeBinding;
+
+public class WelcomeActivity extends AppCompatActivity {
+
+    private AppBarConfiguration appBarConfiguration;
+    private ActivityWelcomeBinding binding;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        binding = ActivityWelcomeBinding.inflate(getLayoutInflater());
+        setContentView(binding.getRoot());
+
+//        setSupportActionBar(binding.toolbar);
+
+        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_welcome);
+
+//        appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();
+//        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
+
+//        binding.fab.setOnClickListener(new View.OnClickListener() {
+//            @Override
+//            public void onClick(View view) {
+//                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
+//                        .setAction("Action", null).show();
+//            }
+//        });
+    }
+
+//    @Override
+//    public boolean onCreateOptionsMenu(Menu menu) {
+//        // Inflate the menu; this adds items to the action bar if it is present.
+////        getMenuInflater().inflate(R.menu.menu_main, menu);
+//        return true;
+//    }
+//
+//    @Override
+//    public boolean onOptionsItemSelected(MenuItem item) {
+//        // Handle action bar item clicks here. The action bar will
+//        // automatically handle clicks on the Home/Up button, so long
+//        // as you specify a parent activity in AndroidManifest.xml.
+//        int id = item.getItemId();
+//
+//        //noinspection SimplifiableIfStatement
+//        if (id == R.id.puzzle_grid) {
+//            return true;
+//        }
+//
+//        return super.onOptionsItemSelected(item);
+//    }
+
+
+    @Override
+    public boolean onSupportNavigateUp() {
+        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_welcome);
+        return NavigationUI.navigateUp(navController, appBarConfiguration)
+                || super.onSupportNavigateUp();
+    }
+}

app/src/main/java/org/vostan/banvor/WelcomeFragment.java

@@ -0,0 +1,68 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.vostan.banvor;
+
+import static org.vostan.banvor.App.theApp;
+
+import android.os.Bundle;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.navigation.fragment.NavHostFragment;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+//import android.widget.Button;
+//import android.widget.TextView;
+//import static org.vostan.banvor.App.theApp;
+
+import org.vostan.banvor.databinding.FragmentWelcomeBinding;
+import org.vostan.banvor.game.State;
+
+/**
+ *
+ */
+public class WelcomeFragment extends Fragment
+{
+	private FragmentWelcomeBinding binding;
+	private State gameState;
+
+	@Override
+	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
+	{
+		gameState = theApp().state();
+		binding = FragmentWelcomeBinding.inflate(inflater, container, false);
+		return binding.getRoot();
+	}
+
+	public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
+		super.onViewCreated(view, savedInstanceState);
+
+		binding.btnContinue.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View view) {
+				WelcomeFragmentDirections.ActionWelcomeFragmentToPuzzleBoardFragment action =
+						WelcomeFragmentDirections.actionWelcomeFragmentToPuzzleBoardFragment();
+				action.setLevel(gameState.getCurrentLevel());
+				NavHostFragment.findNavController(WelcomeFragment.this)
+						.navigate(action);
+			}
+		});
+		binding.btnPuzzles.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View view) {
+				NavHostFragment.findNavController(WelcomeFragment.this)
+						.navigate(R.id.action_WelcomeFragment_to_PuzzleListFragment);
+			}
+		});
+	}
+
+	@Override
+	public void onDestroyView() {
+		super.onDestroyView();
+		binding = null;
+	}
+}

app/src/main/java/org/vostan/banvor/board/Animator.java

@@ -2,9 +2,9 @@
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
-package org.vostan.sokoban.play;
+package org.vostan.banvor.board;
 
-import android.support.v4.view.ViewCompat;
+import androidx.core.view.ViewCompat;
 import java.util.LinkedList;
 
 /**
@@ -13,92 +13,6 @@ import java.util.LinkedList;
  */
 public class Animator implements Runnable
 {
-	protected PuzzleView view;
-	protected LinkedList<Action> actions = new LinkedList<Action>();
-	protected boolean stop;
-	protected int step;
-	protected Action currentAction;
-	protected AnimationLister theLister;
-	
-	public interface AnimationLister
-	{
-		public void onAnimationEnd();
-	}
-	
-	public Animator( PuzzleView v)
-	{
-		view = v;
-	}
-	
-	public void setAnimationLister( AnimationLister lister )
-	{
-		theLister = lister;
-	}
-	
-	public void queue( Action a )
-	{
-		actions.addLast(a);
-	}
-	
-	public void play()
-	{
-		//
-		//	If no actions exist then nothing to do.
-		//
-		if ( actions.size() == 0 )
-			return;
-		//
-		//	Get the first action an play it.
-		//
-		stop = false;
-		step = 0;
-		currentAction = actions.removeFirst();
-		ViewCompat.postOnAnimation(view, this);
-	}
-	
-	public void stop()
-	{
-		stop = true;
-		view.removeCallbacks(this);
-		if ( theLister != null )
-			theLister.onAnimationEnd();
-	}
-	
-	public void clear()
-	{
-		actions.clear();
-		currentAction = null;
-	}
-	
-	public void run()
-	{
-		if ( currentAction == null )
-			return;
-		else if ( currentAction.steps > step )
-		{
-			currentAction.intermediate(this,step);
-			step++;
-			ViewCompat.postOnAnimation(view, this);
-		}
-		else
-		{
-			currentAction.last(this);
-			step = 0;
-			currentAction = null;
-			if ( !stop && actions.size() > 0 )
-			{
-				currentAction = actions.removeFirst();
-				step = 0;
-				ViewCompat.postOnAnimation(view, this);
-			}
-			else
-			{
-				if ( theLister != null )
-					theLister.onAnimationEnd();
-			}
-		}	
-	}
-	
 	public static abstract class Action
 	{
 		public int steps;
@@ -205,4 +119,90 @@ public class Animator implements Runnable
 		public void last( Animator ap )
 		{}
 	}
+
+	protected PuzzleView view;
+	protected LinkedList<Action> actions = new LinkedList<Action>();
+	protected boolean stop;
+	protected int step;
+	protected Action currentAction;
+	protected AnimationLister theLister;
+	
+	public interface AnimationLister
+	{
+		public void onAnimationEnd();
+	}
+	
+	public Animator( PuzzleView v)
+	{
+		view = v;
+	}
+	
+	public void setAnimationLister( AnimationLister lister )
+	{
+		theLister = lister;
+	}
+	
+	public void queue( Action a )
+	{
+		actions.addLast(a);
+	}
+	
+	public void play()
+	{
+		//
+		//	If no actions exist then nothing to do.
+		//
+		if ( actions.size() == 0 )
+			return;
+		//
+		//	Get the first action an play it.
+		//
+		stop = false;
+		step = 0;
+		currentAction = actions.removeFirst();
+		ViewCompat.postOnAnimation(view, this);
+	}
+	
+	public void stop()
+	{
+		stop = true;
+		view.removeCallbacks(this);
+		if ( theLister != null )
+			theLister.onAnimationEnd();
+	}
+	
+	public void clear()
+	{
+		actions.clear();
+		currentAction = null;
+	}
+	
+	public void run()
+	{
+		if ( currentAction == null )
+			return;
+		else if ( currentAction.steps > step )
+		{
+			currentAction.intermediate(this,step);
+			step++;
+			ViewCompat.postOnAnimation(view, this);
+		}
+		else
+		{
+			currentAction.last(this);
+			step = 0;
+			currentAction = null;
+			if ( !stop && actions.size() > 0 )
+			{
+				currentAction = actions.removeFirst();
+				step = 0;
+				ViewCompat.postOnAnimation(view, this);
+			}
+			else
+			{
+				if ( theLister != null )
+					theLister.onAnimationEnd();
+			}
+		}	
+	}
 }

app/src/main/java/org/vostan/banvor/board/PlayActivity.java

@@ -1,11 +1,13 @@
-package org.vostan.sokoban.play;
+package org.vostan.banvor.board;
 
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
+import androidx.fragment.app.DialogFragment;
-import android.support.v4.app.FragmentActivity;
+import androidx.fragment.app.FragmentActivity;
+
+import android.util.AttributeSet;
 import android.view.View;
 import android.view.Window;
 import android.view.animation.Animation;
@@ -13,11 +15,11 @@ import android.view.animation.AnimationUtils;
 import android.widget.FrameLayout;
 import android.widget.TextView;
 
-import org.vostan.sokoban.App;
+import org.vostan.banvor.App;
 
-import static org.vostan.sokoban.App.theApp;
+import static org.vostan.banvor.App.theApp;
-import org.vostan.sokoban.R;
+import org.vostan.banvor.R;
-import org.vostan.sokoban.Puzzle;
+import org.vostan.banvor.model.Puzzle;
 
 public class PlayActivity extends FragmentActivity
 							implements PuzzleControl.PuzzleControlLister
@@ -41,16 +43,17 @@ public class PlayActivity extends FragmentActivity
 		//
 		//	Create and set up the puzzle_view.
 		//
-		puzzle_view = new PuzzleControl( this );
+//		puzzle_view = new PuzzleControl(this, new AttributeSet() {
+//		});
 		setContentView( puzzle_view );
 		puzzle_view.setPuzzleControlLister( this );
 		//
 		//	Create action bar.
 		//
 		FrameLayout rootLayout = (FrameLayout)findViewById(android.R.id.content);
-		View.inflate(this, R.layout.puzzle_view_title, rootLayout);
+		View.inflate(this, R.layout.fragment_puzzle_board, rootLayout);
-		title_text = (TextView)findViewById(R.id.title_text);
+		title_text = (TextView)findViewById(R.id.level_text);
-		title_view = findViewById(R.id.puzzle_view_title_layout);
+//		title_view = findViewById(R.id.puzzle_view_title_layout);
 		//
 		//	Load the puzzle.
 		//
@@ -62,9 +65,9 @@ public class PlayActivity extends FragmentActivity
 		//
 		//	Advance current level and achieved level.
 		//
-		final int nextl = theApp().getCurrentLevel()+1;
+		final int nextl = theApp().state().getCurrentLevel()+1;
-		theApp().advanceAchivedLevel(nextl);
+//		theApp().state().(nextl);
-		theApp().setCurrentLevel(nextl);
+		theApp().state().setCurrentLevel(nextl);
 		//
 		//	Bring a dialog for user to choose to continue or stop.
 		//
@@ -146,9 +149,9 @@ public class PlayActivity extends FragmentActivity
 		//	If current level is less than achived level the move to next
 		//	puzzle.
 		//
-		if ( theApp().getCurrentLevel() > App.MIN_LEVEL )
+		if ( theApp().state().getCurrentLevel() > App.MIN_LEVEL )
 		{
-			theApp().setCurrentLevel( theApp().getCurrentLevel()-1 );
+			theApp().state().setCurrentLevel( theApp().state().getCurrentLevel()-1 );
 			loadCurrentPuzzle();
 			puzzle_view.invalidate();
 		}
@@ -163,9 +166,9 @@ public class PlayActivity extends FragmentActivity
 		//	If current level is less than achived level the move to next
 		//	puzzle.
 		//
-		if ( theApp().getCurrentLevel() < theApp().getAchivedLevel() )
+		if ( theApp().state().getCurrentLevel() < theApp().state().getHighestSolvedLevel() )
 		{
-			theApp().setCurrentLevel( theApp().getCurrentLevel()+1 );
+			theApp().state().setCurrentLevel( theApp().state().getCurrentLevel()+1 );
 			loadCurrentPuzzle();
 			puzzle_view.invalidate();
 
@@ -189,13 +192,13 @@ public class PlayActivity extends FragmentActivity
 
 	private void loadCurrentPuzzle()
 	{
-		puzzle = theApp().getCurrentPuzzle();
+		puzzle = theApp().state().getCurrentPuzzle();
 		puzzle_view.setPuzzle(puzzle);
 		updateTitle();
 	}
 	public void updateTitle()
 	{
-		String title = "Level " + new Integer(theApp().getCurrentLevel()).toString();
+		String title = "Level " + new Integer(theApp().state().getCurrentLevel()).toString();
 		setTitle(title);
 	}
 	public void setTitle(CharSequence title)

app/src/main/java/org/vostan/banvor/board/PuzzleControl.java

@@ -2,14 +2,17 @@
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
-package org.vostan.sokoban.play;
+package org.vostan.banvor.board;
 
 import android.content.Context;
 import android.graphics.Point;
+import android.util.AttributeSet;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.ScaleGestureDetector;
-import org.vostan.sokoban.Puzzle;
+
+import org.vostan.banvor.game.PuzzleLogic;
+import org.vostan.banvor.model.Puzzle;
 
 //import android.support.v4.view.GestureDetectorCompat;
 
@@ -39,9 +42,9 @@ public class PuzzleControl extends PuzzleView
 		public void onTouch();
 	}
 	
-	public PuzzleControl(Context c)
+	public PuzzleControl(Context c, AttributeSet attributeSet)
 	{
-		super(c);
+		super(c,attributeSet);
 		logic = new PuzzleLogic();
 		animator = new Animator( this );
 		animator.setAnimationLister(this);

app/src/main/java/org/vostan/banvor/board/PuzzleView.java

@@ -1,4 +1,4 @@
-package org.vostan.sokoban.play;
+package org.vostan.banvor.board;
 
 import android.content.Context;
 import android.graphics.Bitmap;
@@ -9,13 +9,15 @@ import android.graphics.Paint;
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.RectF;
-import android.support.v4.view.ViewCompat;
+import androidx.core.view.ViewCompat;
+
+import android.util.AttributeSet;
 import android.view.View;
 import static java.lang.Math.*;
 
-import org.vostan.sokoban.Puzzle;
+import org.vostan.banvor.model.Puzzle;
-import static org.vostan.sokoban.Puzzle.*;
+import static org.vostan.banvor.model.Puzzle.*;
-import org.vostan.sokoban.R;
+import org.vostan.banvor.R;
 
 /**
  */
@@ -38,9 +40,9 @@ public class PuzzleView extends View
     private Rect tile_src = new Rect();
     private RectF tile_dest = new RectF();
 
-    public PuzzleView(Context context)
+    public PuzzleView(Context context, AttributeSet attributeSet)
 	{
-        super(context);
+        super(context, attributeSet);
         setFocusable(true);
 		
 //
@@ -53,24 +55,22 @@ public class PuzzleView extends View
 //        a.recycle();
     }
 	
-	public void setPuzzle( Puzzle p )
+	public void setPuzzle( Puzzle p ){
-	{
 		puzzle = p;
 		board.set(0,0,puzzle.getColumnCount(),puzzle.getRowCount());
 		viewport.set(board);
 		tile_size.set(0,0);
 		calcTransforms();
 		initTiles();
+		invalidate();
 	}
 
-	public Puzzle getPuzzle()
+	public Puzzle getPuzzle(){
-	{
 		return puzzle;
 	}
 
 	@Override
-    protected void onSizeChanged(int w, int h, int oldw, int oldh)
+    protected void onSizeChanged(int w, int h, int oldw, int oldh){
-	{
 		screen.set(0, 0, w, h);
 		tile_size.set(0,0);
 		calcTransforms();
@@ -78,8 +78,7 @@ public class PuzzleView extends View
     }
 
 
-	public void scaleViewport( float focusX, float focusY, float scale )
+	public void scaleViewport( float focusX, float focusY, float scale ){
-	{
 		float left = scale*(focusX - screen.left);
 		float right = scale*(screen.right - focusX);
 		float top = scale*(focusY - screen.top);
@@ -91,14 +90,12 @@ public class PuzzleView extends View
 		ViewCompat.postInvalidateOnAnimation(this);
 	}
 
-	public void scaleViewportDone()
+	public void scaleViewportDone(){
-	{
 		//initTiles();
 		ViewCompat.postInvalidateOnAnimation(this);
 	}
 
-	public void scrollViewport( float distanceX, float distanceY )
+	public void scrollViewport( float distanceX, float distanceY ){
-	{
 		viewport.set( screen.left+distanceX,
 						screen.top+distanceY,
 						screen.right+distanceX,

app/src/main/java/org/vostan/banvor/game/PuzzleLogic.java

@@ -2,15 +2,16 @@
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
-package org.vostan.sokoban.play;
+package org.vostan.banvor.game;
 
 import static java.lang.Math.*;
 import java.util.Arrays;
-import org.vostan.sokoban.Puzzle;
+
+import org.vostan.banvor.board.Animator;
+import org.vostan.banvor.model.Puzzle;
 
 /**
  *
- * @author vahagnk
  */
 public class PuzzleLogic
 {

app/src/main/java/org/vostan/banvor/game/State.java

@@ -0,0 +1,134 @@
+package org.vostan.banvor.game;
+
+import static org.vostan.banvor.App.theApp;
+
+import android.content.SharedPreferences;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+
+import org.vostan.banvor.model.IPuzzleSource;
+import org.vostan.banvor.model.Puzzle;
+
+public class State {
+    public static final String TAG = "Sokoban.Sate";
+    public static final String CUR_LEVEL = "current_level";
+    public static final String HIGH_LEVEL = "highest_unlocked_level";
+
+    protected IPuzzleSource mPuzzleSource;
+    protected int mCurrentLevel;
+    protected int mHighestUnlockedLevel;
+    public static final int MIN_LEVEL = 1;
+    protected int mMaxLevel;
+
+    public State(@NonNull IPuzzleSource ps){
+        mPuzzleSource = ps;
+        mCurrentLevel = 0;
+        mHighestUnlockedLevel = 0;
+        mMaxLevel = mPuzzleSource.getCount();
+    }
+
+    //
+    //  These are to save the game state and restore it.
+    //
+    public void storeState(@NonNull SharedPreferences.Editor prefs){
+        prefs.putInt(CUR_LEVEL, mCurrentLevel);
+        prefs.putInt(HIGH_LEVEL, mHighestUnlockedLevel);
+        prefs.apply();
+        if ( !prefs.commit() ) {
+            Log.d(TAG, "prefs.edit().commit() failed.");
+        }
+    }
+
+    public void loadState(@NonNull SharedPreferences prefs){
+        mCurrentLevel = prefs.getInt(CUR_LEVEL, MIN_LEVEL);
+		mHighestUnlockedLevel = prefs.getInt(HIGH_LEVEL, MIN_LEVEL);
+    }
+
+    //
+    //	Provide amount of puzzles.
+    //
+    public final int getPuzzleCount()
+    {
+        return mPuzzleSource.getCount();
+    }
+
+    //
+    //	Puzzles.
+    //
+    public Puzzle getPuzzle(int level )
+    {
+        return mPuzzleSource.getPuzzle( level-1 );
+    }
+    public Puzzle getCurrentPuzzle()
+    {
+        return getPuzzle( getCurrentLevel() );
+    }
+    public Puzzle getPrevPuzzle()
+    {
+        if ( mCurrentLevel != MIN_LEVEL ) {
+            return getPuzzle(getCurrentLevel() - 1);
+        }
+        else {
+            return null;
+        }
+    }
+    public Puzzle getNextPuzzle()
+    {
+        if ( mCurrentLevel != mHighestUnlockedLevel) {
+            return getPuzzle(getCurrentLevel() + 1);
+        }
+        else {
+            return null;
+        }
+    }
+
+    //
+    //  Level Unlock logic
+    //
+    public Boolean isLocked(int level){
+        return level > mHighestUnlockedLevel;
+    }
+    private void unlockLevel( int l )
+    {
+        if ( l > mMaxLevel){
+            l = mMaxLevel;
+        }
+        if ( l > mHighestUnlockedLevel) {
+            mHighestUnlockedLevel = l;
+        }
+        theApp().storeGameState();
+    }
+    public void levelSolved(int l){
+        unlockLevel(l+1);
+    }
+
+    //
+    //	Provide highest solved puzzle.
+    //
+    public final int getHighestSolvedLevel(){
+        return mHighestUnlockedLevel;
+    }
+    //
+    //	Provide last played puzzle.
+    //
+    public final int getCurrentLevel(){
+        return mCurrentLevel;
+    }
+    //
+    //	Set the current puzzle level.
+    //
+    public void setCurrentLevel( int l ) {
+        if ( l > mHighestUnlockedLevel){
+            l = MIN_LEVEL;
+        }
+        else if ( l < MIN_LEVEL ) {
+            l = mHighestUnlockedLevel;
+        }
+        mCurrentLevel = l;
+        theApp().storeGameState();
+    }
+    public void advanceCurrentLevel(){
+        setCurrentLevel(mCurrentLevel+1);
+    }
+}

app/src/main/java/org/vostan/banvor/model/Coord.java

@@ -0,0 +1,6 @@
+package org.vostan.banvor.model;
+
+public class Coord {
+    public int x;
+    public int y;
+}

app/src/main/java/org/vostan/banvor/model/IPuzzleSource.java

@@ -0,0 +1,6 @@
+package org.vostan.banvor.model;
+
+public interface IPuzzleSource {
+    public int getCount();
+    public Puzzle getPuzzle( int i );
+}

app/src/main/java/org/vostan/banvor/model/Puzzle.java

@@ -1,4 +1,4 @@
-package org.vostan.sokoban;
+package org.vostan.banvor.model;
 
 //import java.lang.Exception;
 import java.io.*;
@@ -7,7 +7,7 @@ import android.util.Log;
 
 import java.util.LinkedList;
 
-import static org.vostan.sokoban.App.TAG;
+import static org.vostan.banvor.App.TAG;
 
 public class Puzzle
 {

app/src/main/java/org/vostan/banvor/model/PuzzleContainer.java

@@ -1,12 +1,13 @@
-package org.vostan.sokoban;
+package org.vostan.banvor.model;
 
 import java.io.InputStream;
 import java.io.IOException;
-import static org.vostan.sokoban.App.theApp;
+import static org.vostan.banvor.App.theApp;
+import org.vostan.banvor.model.Puzzle;
 
-import org.vostan.sokoban.R;
+import org.vostan.banvor.R;
 
-public class PuzzleContainer
+public class PuzzleContainer implements IPuzzleSource
 {
 	protected int count;
 	

app/src/main/java/org/vostan/sokoban/App.java

@@ -1,123 +0,0 @@
-package org.vostan.sokoban;
-
-import android.app.Application;
-import android.content.SharedPreferences;
-import android.util.Log;
-
-public class App extends Application
-{	
-	public static final String TAG = "Sokoban";
-	public static final String PREFS = "org.dyndns.vahagn.sokoban.prefs";
-	public static final int MIN_LEVEL = 1;
-	
-	private static App mApp = null;
-	protected PuzzleContainer pc;
-	protected int current_level;
-	protected int achieved_level;
-	protected int max_level;
-	protected SharedPreferences prefs;
-	protected SharedPreferences.Editor prefsEdit;
-	
-	/*
-	 *
-	 */
-	@Override
-	public void onCreate()
-	{
-	    super.onCreate();
-	    mApp = this;
-	    pc = new PuzzleContainer();
-		prefs = getSharedPreferences(PREFS, MODE_PRIVATE);
-		prefsEdit = prefs.edit();
-	    max_level = pc.getCount();
-		current_level = prefs.getInt("current_level", MIN_LEVEL);
-		achieved_level = prefs.getInt("achieved_level", MIN_LEVEL+10);
-	}
-	//
-	//	This is a singleton object.
-	//
-	public static App theApp()
-	{
-	    return mApp;
-	}
-	//
-	//	Puzzles.
-	//
-	public Puzzle getPuzzle( int level )
-	{
-		return pc.getPuzzle( level-1 );
-	}
-	public Puzzle getCurrentPuzzle()
-	{
-		return getPuzzle( getCurrentLevel() );
-	}
-	public Puzzle getPrevPuzzle()
-	{
-		if ( current_level != MIN_LEVEL )
-			return getPuzzle( getCurrentLevel()-1 );
-		else
-			return null;
-	}
-	public Puzzle getNextPuzzle()
-	{
-		if ( current_level != achieved_level )
-			return getPuzzle( getCurrentLevel()+1 );
-		else
-			return null;
-	}
-	//
-	//	Provide amount of puzzles.
-	//
-	public final int getPuzzleCount()
-	{
-		return max_level;
-	}
-	//
-	//	Provide highest solved puzzle.
-	//
-	public final int getAchivedLevel()
-	{
-		return achieved_level;
-	}
-	//
-	//	Provide last played puzzle.
-	//
-	public final int getCurrentLevel()
-	{
-		return current_level;
-	}
-	//
-	//	Set the current puzzle level.
-	//
-	public void setCurrentLevel( int l )
-	{
-		if ( l > achieved_level )
-			l = MIN_LEVEL;
-		if ( l < MIN_LEVEL )
-			l = achieved_level;
-		if ( l != current_level )
-		{
-			current_level = l;
-			prefsEdit.putInt("current_level", current_level);
-			prefsEdit.apply();
-			if ( !prefs.edit().commit() )
-				Log.d(TAG, "prefs.edit().commit() failed.");
-		}
-	}
-	//
-	//	Set achieved level.
-	//
-	public void advanceAchivedLevel( int l )
-	{
-		if ( l > max_level )
-			l = max_level;
-		if ( l > achieved_level )
-		{
-			achieved_level = l;
-			prefsEdit.putInt("achieved_level", achieved_level);
-			prefsEdit.apply();
-			if ( !prefs.edit().commit() )
-				Log.d(TAG, "prefs.edit().commit() failed.");
-		}
-	}
-}

app/src/main/java/org/vostan/sokoban/menu/MainActivity.java

@@ -1,119 +0,0 @@
-package org.vostan.sokoban.menu;
-
-import org.vostan.sokoban.play.PlayActivity;
-
-import android.content.Intent;
-import android.view.View;
-import android.os.Bundle;
-import android.support.v4.app.FragmentActivity;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentTransaction;
-import android.view.Window;
-
-import org.vostan.sokoban.R;
-import static org.vostan.sokoban.App.theApp;
-
-public class MainActivity extends FragmentActivity 
-{
-	protected final String TAG = "SokobanMenu";
-	protected final String LEVEL= "org.dyndns.vahagn.sokoban.LEVEL";
-	protected MainFragment mainFragment;
-	protected PuzzleListFragment puzzleListFragment;
-	protected float puzzleListXScroll;
-	protected float puzzleListXScrollMax;
-    
-	/** Called when the activity is first created. */
-    @Override
-    public void onCreate(Bundle savedInstanceState)
-    {
-        requestWindowFeature(Window.FEATURE_NO_TITLE);
-    	
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.main_activity);
-
-		mainFragment = new MainFragment();
-		puzzleListFragment = new PuzzleListFragment();
-		puzzleListFragment.setOnPuzzleListAction(new PuzzleListFragment.OnPuzzleListAction() {
-			public boolean onPuzzleGridDown() {
-				return onPuzzleGridDown1();
-			}
-			public boolean onPuzzleGridXScroll(float x) {
-				return onPuzzleGridXScroll1(x);
-			}
-			public void onPuzzleLevelClicked(int level) {
-				onPuzzleClicked1(level);
-			}
-		});
-		puzzleListXScrollMax = getWindowManager().getDefaultDisplay().getWidth();
-
-		//
-		//	Set initila fragment.
-		//
-		FragmentManager fragmentManager = getSupportFragmentManager();
-		FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
-		fragmentTransaction.add(R.id.fragment_container, mainFragment);
-//		fragmentTransaction.add(R.id.fragment_container, puzzleListFragment);
-		fragmentTransaction.commit();
-    }
-   	    
-    //@Override
-    public void onConfigurationChanged()
-    {
-       // super.onConfigurationChanged();
-       // setContentView(R.layout-l.menu);
-    }
-    
-    public void onStartCurrentPuzzle(View v)
-    {
-    	Intent intent = new Intent(this, PlayActivity.class);		
-    	startActivity( intent );
-    }
-	
-    public void onPuzzleListShow(View v)
-    {
-		getSupportFragmentManager()
-			.beginTransaction()
-			.setCustomAnimations(R.animator.fragment_slide_left_enter,
-								R.animator.fragment_slide_left_exit)
-			.replace(R.id.fragment_container, puzzleListFragment)
-			.commit();
-    }
-	
-	public boolean onPuzzleGridDown1()
-	{
-		puzzleListXScroll = 0;
-		return true;
-	}
-	
-	public boolean onPuzzleGridXScroll1( float x )
-	{
-		puzzleListXScroll += x;
-		/*
-		getSupportFragmentManager()
-			.beginTransaction()
-			.setCustomAnimations(R.animator.fragment_slide_right_enter,
-								R.animator.fragment_slide_right_exit)
-			.commit();
-			*/
-		if ( -puzzleListXScroll/puzzleListXScrollMax > 0.5 )
-		{
-			getSupportFragmentManager()
-				.beginTransaction()
-				.setCustomAnimations(R.animator.fragment_slide_right_enter,
-									R.animator.fragment_slide_right_exit)
-				.replace(R.id.fragment_container, mainFragment)
-				.commit();
-		}
-		return true;
-	}
-		
-	public void onPuzzleClicked1( int level )
-    {
-		if ( level <= theApp().getAchivedLevel() )
-		{
-			theApp().setCurrentLevel(level);
-			Intent intent = new Intent(this, PlayActivity.class);
-			startActivity( intent );
-		}
-    }
-}

app/src/main/java/org/vostan/sokoban/menu/MainFragment.java

@@ -1,39 +0,0 @@
-/*
- * To change this template, choose Tools | Templates
- * and open the template in the editor.
- */
-package org.vostan.sokoban.menu;
-
-import android.os.Bundle;
-import android.support.v4.app.Fragment;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.Button;
-import android.widget.TextView;
-import static org.vostan.sokoban.App.theApp;
-import org.vostan.sokoban.R;
-
-/**
- *
- * @author vahagnk
- */
-public class MainFragment extends Fragment
-{
-	@Override
-	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle icicle)
-	{
-		super.onCreate(icicle);
-		View v = inflater.inflate(R.layout.main_fragment, container, false);
-		if ( theApp().getAchivedLevel() == 1 )
-			((Button)v.findViewById(R.id.btn_start)).setText(R.string.btn_start_begin);
-		//
-		//	Set Footer.
-		//
-		String str = getString(R.string.copyright) + "\n" 
-				+getString(R.string.version_tag) + " " + getString(R.string.git_version);
-		((TextView)v.findViewById(R.id.footer_txt)).setText(str);
-		
-		return v;
-	}
-}

app/src/main/java/org/vostan/sokoban/menu/PuzzleListFragment.java

@@ -1,183 +0,0 @@
-/*
- * To change this template, choose Tools | Templates
- * and open the template in the editor.
- */
-package org.vostan.sokoban.menu;
-
-import android.content.Context;
-import android.graphics.Bitmap;
-import android.graphics.BitmapFactory;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.graphics.Rect;
-import android.os.Bundle;
-import android.support.v4.app.Fragment;
-import android.util.TypedValue;
-import android.view.GestureDetector;
-import android.view.LayoutInflater;
-import android.view.MotionEvent;
-import android.view.View;
-import android.view.ViewGroup;
-import android.widget.AdapterView;
-import android.widget.BaseAdapter;
-import android.widget.GridView;
-import android.widget.ImageView;
-
-import org.vostan.sokoban.R;
-
-import static org.vostan.sokoban.App.theApp;
-
-/**
- *
- */
-public class PuzzleListFragment extends Fragment
-{
-	protected GridView puzzleGrid;
-	protected PuzzlesAdapter puzzleGridAdapter; 
-	protected GestureDetector gridViewXScrollDetector;
-	protected OnPuzzleListAction actionListener;
-
-	/*
-	 * These are events which the fragments delegates to activity.
-	 */
-	public interface OnPuzzleListAction
-	{
-		public boolean onPuzzleGridDown();
-		public boolean onPuzzleGridXScroll( float x );
-		public void onPuzzleLevelClicked( int level );
-	}
-	public void setOnPuzzleListAction( OnPuzzleListAction l )
-	{
-		actionListener = l;
-	}
-	
-	@Override
-	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle icicle)
-	{
-		super.onCreate(icicle);
-		View v = inflater.inflate(R.layout.puzzle_list_fragment, container, false);
-		//
-		//	Configure GridView.
-		//
-		puzzleGrid = (GridView)v.findViewById(R.id.puzzle_grid);
-		puzzleGridAdapter = new PuzzlesAdapter(getActivity());
-		puzzleGrid.setAdapter( puzzleGridAdapter );
-		puzzleGrid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
-			public void onItemClick(AdapterView<?> parent, View v, int position, long id)
-			{
-				onPuzzleClicked(v,(int)id);
-			}
-		});
-		puzzleGrid.setOnTouchListener( new View.OnTouchListener() {
-			public boolean onTouch(View view, MotionEvent me) {
-				gridViewXScrollDetector.onTouchEvent( me );
-				return false;
-			}
-		});
-		gridViewXScrollDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener() {
-			public boolean onDown(MotionEvent e) {
-				return (actionListener!=null) ? actionListener.onPuzzleGridDown() : false;
-			}
-			public boolean onScroll(MotionEvent e1, MotionEvent e2, float dx, float dy) {
-				return (actionListener!=null) ? actionListener.onPuzzleGridXScroll(dx) : false;
-			}
-		});
-		
-		return v;
-	}
-		
-	@Override
-	public void onResume()
-	{
-		super.onResume();
-		if ( puzzleGrid != null )
-			puzzleGridAdapter.notifyDataSetChanged();
-	}
-
-	public void onPuzzleClicked(View v, int level )
-    {
-		if (actionListener!=null)
-			actionListener.onPuzzleLevelClicked(level);
-    }
-	
-	public class PuzzlesAdapter extends BaseAdapter
-	{
-		private Context context;
-		private int icon_size;
-		private int text_x;
-		private int text_y;
-		private Bitmap lock_icon;
-		private Bitmap unlock_icon;
-		private Paint paint;
-
-		public PuzzlesAdapter(Context c)
-		{
-			context = c;
-			icon_size = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_MM, 10, getResources().getDisplayMetrics() );
-			int text_size = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_MM, 4, getResources().getDisplayMetrics() );
-			text_x = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_MM, 9, getResources().getDisplayMetrics() );
-			text_y = (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_MM, 9, getResources().getDisplayMetrics() );
-			
-			Bitmap lock_icon_tmp = BitmapFactory.decodeResource( getResources(), R.drawable.lock );
-			lock_icon = Bitmap.createBitmap(icon_size,icon_size,Bitmap.Config.ARGB_8888);
-			Canvas lock_canvas = new Canvas(lock_icon);
-			lock_canvas.drawBitmap(lock_icon_tmp, 
-				new Rect(0,0,lock_icon_tmp.getWidth()-1,lock_icon_tmp.getHeight()-1), 
-				new Rect(0,0,icon_size, icon_size),
-				null);
-		
-			Bitmap unlock_icon_tmp = BitmapFactory.decodeResource( getResources(), R.drawable.unlock );
-			unlock_icon = Bitmap.createBitmap(icon_size,icon_size,Bitmap.Config.ARGB_8888);
-			Canvas unlock_canvas = new Canvas(unlock_icon);
-			unlock_canvas.drawBitmap(unlock_icon_tmp, 
-				new Rect(0,0,unlock_icon_tmp.getWidth()-1,unlock_icon_tmp.getHeight()-1), 
-				new Rect(0,0,icon_size, icon_size),
-				null);
-			
-			paint = new Paint();
-			paint.setColor( Color.WHITE );
-			paint.setTextSize( text_size );
-			paint.setTextAlign(Paint.Align.RIGHT);
-		}
-
-		public int getCount()
-		{
-			return theApp().getPuzzleCount();
-		}
-
-		public Object getItem(int position)
-		{
-			return null;
-		}
-
-		public long getItemId(int position)
-		{
-			return position+1;
-		}
-
-		// create a new ImageView for each item referenced by the Adapter
-		public View getView(int position, View convertView, ViewGroup parent)
-		{
-			ImageView imageView;
-			if (convertView == null)
-			{  // if it's not recycled, initialize some attributes
-				imageView = new ImageView(context);
-				imageView.setLayoutParams(new GridView.LayoutParams(icon_size, icon_size));
-				imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
-			}
-			else
-				imageView = (ImageView) convertView;
-
-			int id = (int)getItemId(position);
-			Bitmap icon = ( id <= theApp().getAchivedLevel() ) 
-					? unlock_icon.copy(Bitmap.Config.ARGB_8888,true)
-					: lock_icon.copy(Bitmap.Config.ARGB_8888,true);
-			Canvas canvas = new Canvas(icon);
-			canvas.drawText( Integer.toString(id), text_x, text_y, paint);
-			imageView.setImageBitmap(icon);
-			return imageView;
-		}
-	}
-
-}

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

app/src/main/res/layout/activity_welcome.xml

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".WelcomeActivity">
+
+    <!--com.google.android.material.appbar.AppBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:theme="@style/AppBarOverlay">
+
+        <androidx.appcompat.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            app:popupTheme="@style/PopupOverlay" />
+
+    </com.google.android.material.appbar.AppBarLayout-->
+
+    <include
+        layout="@layout/content_welcome"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <!--fragment
+        android:id="@+id/welcome_fragment"
+        android:name="org.vostan.banvor.WelcomeFragment"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:defaultNavHost="true"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:navGraph="@layout/fragment_welcome" /-->
+
+    <!--com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_marginEnd="@dimen/fab_margin"
+        android:layout_marginBottom="16dp"
+        app:srcCompat="@android:drawable/ic_dialog_email" /-->
+
+<!--    <androidx.fragment.app.FragmentContainerView-->
+<!--        android:id="@+id/fragmentContainerView"-->
+<!--        android:name="org.vostan.banvor.WelcomeFragment"-->
+<!--        android:layout_width="match_parent"-->
+<!--        android:layout_height="match_parent" />-->
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/layout/content_welcome.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+    <fragment
+        android:id="@+id/nav_host_fragment_content_welcome"
+        android:name="androidx.navigation.fragment.NavHostFragment"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:defaultNavHost="true"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:navGraph="@navigation/nav_graph" />
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/fragment_puzzle_board.xml

@@ -0,0 +1,119 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	tools:context=".PuzzleBoardFragment">
+
+	<LinearLayout
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"
+		android:background="@color/blure"
+		android:orientation="vertical"
+		tools:layout_editor_absoluteX="1dp"
+		tools:layout_editor_absoluteY="1dp">
+
+		<LinearLayout
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:layout_weight="0"
+			android:orientation="horizontal">
+
+			<TextView
+				android:id="@+id/level_text"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:layout_weight="0"
+				android:gravity="center_vertical"
+				android:paddingLeft="5dp"
+				android:textColor="@color/puzzle_title"
+				android:textScaleX="1"
+				android:textSize="40dp"
+				android:textStyle="bold"
+				android:typeface="normal"
+				android:text="Level"/>
+
+			<TextView
+				android:id="@+id/level_number"
+				android:layout_width="wrap_content"
+				android:layout_height="match_parent"
+				android:layout_weight="0"
+				android:paddingLeft="10dp"
+				android:textColor="@color/puzzle_title"
+				android:textScaleX="1"
+				android:textSize="40dp"
+				android:textStyle="bold"
+				android:typeface="normal"
+				android:text="XX" />
+
+			<View
+				android:id="@+id/view"
+				android:layout_width="1dp"
+				android:layout_height="match_parent"
+				android:layout_weight="1" />
+
+			<ImageButton
+				android:id="@+id/btn_prev"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:layout_gravity="center_vertical"
+				android:layout_margin="0dp"
+				android:layout_weight="0"
+				android:background="@color/transparent"
+				android:scaleType="fitCenter"
+				android:src="@drawable/prev" />
+
+
+			<ImageButton
+                android:src="@drawable/next"
+              	android:scaleType="fitCenter"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+              	android:layout_gravity="center_vertical"
+              	android:layout_weight="0"
+              	android:layout_margin="0dp"
+				android:background="@color/transparent"
+                android:id="@+id/btn_next"/>
+
+			<ImageButton
+				android:id="@+id/btn_reset"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:layout_gravity="center_vertical"
+				android:layout_margin="0dp"
+				android:layout_weight="0"
+				android:background="@color/transparent"
+				android:scaleType="fitCenter"
+				android:src="@drawable/reset" />
+
+			<ImageButton
+				android:id="@+id/btn_undo"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:layout_gravity="center_vertical"
+				android:layout_margin="3dp"
+				android:layout_weight="0"
+				android:background="@color/transparent"
+				android:scaleType="fitCenter"
+				android:src="@drawable/undo"
+				android:visibility="gone"
+				tools:visibility="visible" />
+		</LinearLayout>
+
+<!--		<View-->
+<!--			android:layout_width="0dp"-->
+<!--			android:layout_height="match_parent"-->
+<!--			android:layout_weight="1" />-->
+
+		<org.vostan.banvor.board.PuzzleControl
+			android:id="@+id/game_board"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:layout_weight="1"
+			 />
+
+
+</LinearLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
+

app/src/main/res/layout/fragment_puzzle_list.xml

@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:background="@drawable/splash"
+	tools:context=".PuzzleListFragment">
+
+	<LinearLayout
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"
+		android:background="@color/transparent"
+		android:orientation="vertical"
+		tools:layout_editor_absoluteX="1dp"
+		tools:layout_editor_absoluteY="1dp">
+
+<!--		<androidx.recyclerview.widget.RecyclerView-->
+<!--			android:layout_width="match_parent"-->
+<!--			android:layout_height="match_parent"-->
+<!--			android:layout_weight="1"-->
+<!--			android:background="@color/transparent"-->
+<!--			tools:itemCount="3" />-->
+		<View
+			android:layout_width="match_parent"
+			android:layout_height="20dp"
+			android:layout_weight="2"
+			android:background="@color/transparent" />
+
+		<GridView
+			android:id="@+id/puzzle_grid"
+			android:layout_width="match_parent"
+			android:layout_height="70dp"
+			android:layout_weight="7"
+			android:verticalSpacing="10dp"
+			android:columnWidth="@dimen/puzzle_list_icon_size"
+			android:numColumns="auto_fit"
+			android:stretchMode="columnWidth"
+			android:gravity="center"
+			android:background="@color/blure"/>
+		<View
+			android:layout_width="match_parent"
+			android:layout_height="10dp"
+			android:layout_weight="1"
+			android:background="@color/transparent" />
+
+
+	</LinearLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
+

app/src/main/res/layout/fragment_welcome.xml

@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:background="@drawable/splash"
+	tools:context=".WelcomeFragment">
+
+	<!--View
+    android:layout_width="match_parent"
+    android:layout_height="0dp"
+	android:layout_gravity="top"
+	android:layout_weight="1"
+	android:gravity="center" /-->
+	<!--Button
+    android:id="@+id/btn_start"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+	android:layout_marginTop="@dimen/main_menu_btn_vmargin"
+	android:layout_marginBottom="@dimen/main_menu_btn_vmargin"
+	android:layout_marginLeft="@dimen/main_menu_btn_hmargin"
+	android:layout_marginRight="@dimen/main_menu_btn_hmargin"
+	android:layout_gravity="center"
+	android:layout_weight="0"
+	android:padding="@dimen/main_menu_btn_padding"
+	android:background="@color/main_menu_btn_bg"
+	android:textColor="@color/main_menu_btn_text"
+	android:textSize="@dimen/main_menu_text_size"
+    android:text="@string/btn_start_continue"
+    android:onClick="onStartCurrentPuzzle" /-->
+	<!--Button
+    android:id="@+id/btn_puzzles"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+	android:layout_marginTop="@dimen/main_menu_btn_vmargin"
+	android:layout_marginBottom="@dimen/main_menu_btn_vmargin"
+	android:layout_marginLeft="@dimen/main_menu_btn_hmargin"
+	android:layout_marginRight="@dimen/main_menu_btn_hmargin"
+	android:layout_gravity="center"
+	android:layout_weight="0"
+	android:padding="@dimen/main_menu_btn_padding"
+	android:background="@color/main_menu_btn_bg"
+	android:textColor="@color/main_menu_btn_text"
+	android:textSize="@dimen/main_menu_text_size"
+    android:text="@string/btn_puzzles"
+    android:onClick="onPuzzleListShow" /-->
+	<!--View
+    android:layout_width="match_parent"
+    android:layout_height="0dp"
+	android:layout_gravity="bottom"
+	android:layout_weight="1"
+	android:gravity="center" /-->
+
+	<LinearLayout
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"
+		android:background="@color/transparent"
+		android:orientation="vertical"
+		tools:layout_editor_absoluteX="1dp"
+		tools:layout_editor_absoluteY="1dp">
+
+		<View
+			android:layout_width="match_parent"
+			android:layout_height="0dp"
+			android:layout_weight="10"
+			android:background="?android:attr/listDivider" />
+
+		<Button
+			android:id="@+id/btn_continue"
+			android:layout_width="match_parent"
+			android:layout_height="80dp"
+			android:background="@color/welcome_btn_bg"
+			android:text="@string/btn_start_continue" />
+
+
+		<View
+			android:layout_width="match_parent"
+			android:layout_height="10dp"
+			android:background="?android:attr/listDivider" />
+
+		<Button
+			android:id="@+id/btn_puzzles"
+			android:layout_width="match_parent"
+			android:layout_height="80dp"
+			android:background="@color/welcome_btn_bg"
+			android:text="@string/btn_puzzles" />
+
+		<View
+			android:layout_width="match_parent"
+			android:layout_height="0dp"
+			android:layout_weight="1"
+			android:background="?android:attr/listDivider" />
+
+		<TextView
+			android:id="@+id/footer_txt"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"
+			android:layout_gravity="center_vertical"
+			android:background="@color/transparent"
+			android:gravity="center"
+			android:text="@string/git_version"
+			android:textColor="@color/on_primary" />
+	</LinearLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
+

app/src/main/res/layout/main_activity.xml

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-	android:id="@+id/fragment_container"
-    android:orientation="horizontal"
-    android:layout_width="fill_parent"
-    android:layout_height="fill_parent">
-</LinearLayout>
-

app/src/main/res/layout/main_fragment.xml

@@ -1,61 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:orientation="vertical"
-    android:layout_width="fill_parent"
-    android:layout_height="fill_parent"
-	android:background="@drawable/splash"
-	android:gravity="center_vertical">
-<View
-    android:layout_width="match_parent"
-    android:layout_height="0dp"
-	android:layout_gravity="top"
-	android:layout_weight="1"
-	android:gravity="center" />
-<Button
-    android:id="@+id/btn_start"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-	android:layout_marginTop="@dimen/main_menu_btn_vmargin"
-	android:layout_marginBottom="@dimen/main_menu_btn_vmargin"
-	android:layout_marginLeft="@dimen/main_menu_btn_hmargin"
-	android:layout_marginRight="@dimen/main_menu_btn_hmargin"
-	android:layout_gravity="center"
-	android:layout_weight="0"
-	android:padding="@dimen/main_menu_btn_padding"
-	android:background="@color/main_menu_btn_bg"
-	android:textColor="@color/main_menu_btn_text"
-	android:textSize="@dimen/main_menu_text_size"
-    android:text="@string/btn_start_continue"
-    android:onClick="onStartCurrentPuzzle" />
-<Button
-    android:id="@+id/btn_puzzles"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-	android:layout_marginTop="@dimen/main_menu_btn_vmargin"
-	android:layout_marginBottom="@dimen/main_menu_btn_vmargin"
-	android:layout_marginLeft="@dimen/main_menu_btn_hmargin"
-	android:layout_marginRight="@dimen/main_menu_btn_hmargin"
-	android:layout_gravity="center"
-	android:layout_weight="0"
-	android:padding="@dimen/main_menu_btn_padding"
-	android:background="@color/main_menu_btn_bg"
-	android:textColor="@color/main_menu_btn_text"
-	android:textSize="@dimen/main_menu_text_size"
-    android:text="@string/btn_puzzles"
-    android:onClick="onPuzzleListShow" />
-<View
-    android:layout_width="match_parent"
-    android:layout_height="0dp"
-	android:layout_gravity="bottom"
-	android:layout_weight="1"
-	android:gravity="center" />
-<TextView
-    android:id="@+id/footer_txt"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content"
-    android:text="@string/git_version"
-	android:layout_gravity="bottom"
-	android:layout_weight="0"
-	android:gravity="center" />
-</LinearLayout>
-

app/src/main/res/layout/puzzle_list_fragment.xml

@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:orientation="vertical"
-    android:layout_width="fill_parent"
-    android:layout_height="fill_parent">
-<GridView
-    android:id="@+id/puzzle_grid"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-	android:horizontalSpacing="2mm"
-	android:verticalSpacing="2mm"
-	android:columnWidth="10mm"
-	android:numColumns="auto_fit"
-    android:stretchMode="columnWidth"
-    android:gravity="center" />
-</LinearLayout>
-

app/src/main/res/layout/puzzle_view_title.xml

@@ -1,71 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-	android:id="@+id/puzzle_view_title_layout"
-    android:orientation="horizontal"
-	android:gravity="center_horizontal"
-	android:background="#60404040"
-   	android:layout_height="48dp" 
-   	android:layout_width="match_parent">
-  	<!--ImageButton
-  		android:src="@drawable/prev"
-		android:scaleType="fitCenter"
-  		android:layout_width="wrap_content"
-  		android:layout_height="20dp"
-		android:layout_gravity="center_vertical"
-		android:layout_weight="0"
-		android:layout_margin="3dp"
-		android:background="#00000000"
-		android:onClick="onPrev"
-  		android:id="@+id/prev_btn"/-->
-  	<TextView
-  		android:text="Level"
-  		android:layout_width="wrap_content"
-  		android:layout_height="match_parent"
-		android:layout_weight="0"
-		android:textSize="40dp"
-		android:paddingLeft="5dp"
-		android:textScaleX="1"
-		android:textColor="#FFE680"
-		android:textStyle="bold"
-		android:typeface="normal"
-		android:gravity="center_vertical"
-  		android:id="@+id/title_text"/>
-	<View
-		android:layout_width="0dp"
-		android:layout_height="match_parent"
-		android:layout_weight="1"/>
-	<ImageButton
-  		android:src="@drawable/undo"
-		android:scaleType="fitCenter"
-  		android:layout_width="wrap_content"
-  		android:layout_height="match_parent"
-		android:layout_gravity="center_vertical"
-		android:layout_weight="0"
-		android:layout_margin="3dp"
-		android:background="#00000000"
-		android:onClick="onUndo"
-  		android:id="@+id/undo_btn"/>
-  	<ImageButton
-  		android:src="@drawable/reset"
-		android:scaleType="fitCenter"
-  		android:layout_width="wrap_content"
-  		android:layout_height="match_parent"
-		android:layout_gravity="center_vertical"
-		android:layout_weight="0"
-		android:layout_margin="3dp"
-		android:background="#00000000"
-		android:onClick="onReset"
-  		android:id="@+id/reset_btn"/>
-  	<!--ImageButton
-  		android:src="@drawable/next"
-		android:scaleType="fitCenter"
-  		android:layout_width="wrap_content"
-  		android:layout_height="20dp"
-		android:layout_gravity="center_vertical"
-		android:layout_weight="0"
-		android:layout_margin="3dp"
-		android:background="#00000000"
-		android:onClick="onNext"
-  		android:id="@+id/next_btn"/-->
-</LinearLayout>
-

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/navigation/nav_graph.xml

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/nav_graph"
+    app:startDestination="@id/WelcomeFragment">
+
+    <fragment
+        android:id="@+id/WelcomeFragment"
+        android:name="org.vostan.banvor.WelcomeFragment"
+        android:label="@string/welcome_fragment_label"
+        tools:layout="@layout/fragment_welcome">
+        <action
+            android:id="@+id/action_WelcomeFragment_to_PuzzleListFragment"
+            app:destination="@id/PuzzleListFragment"
+            app:enterAnim="@anim/nav_default_enter_anim"
+            app:exitAnim="@anim/nav_default_exit_anim" />
+        <action
+            android:id="@+id/action_WelcomeFragment_to_PuzzleBoardFragment"
+            app:destination="@id/PuzzleBoardFragment" />
+    </fragment>
+    <fragment
+        android:id="@+id/PuzzleListFragment"
+        android:name="org.vostan.banvor.PuzzleListFragment"
+        android:label="fragment_puzzle_list"
+        tools:layout="@layout/fragment_puzzle_list">
+        <action
+            android:id="@+id/action_PuzzleListFragment_to_PuzzleBoardFragment"
+            app:destination="@id/PuzzleBoardFragment" />
+    </fragment>
+    <fragment
+        android:id="@+id/PuzzleBoardFragment"
+        android:name="org.vostan.banvor.PuzzleBoardFragment"
+        android:label="fragment_puzzle_board"
+        tools:layout="@layout/fragment_puzzle_board" >
+        <argument
+            android:name="level"
+            app:argType="integer"
+            android:defaultValue="1" />
+    </fragment>
+</navigation>

app/src/main/res/values-land/dimens.xml

@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="fab_margin">48dp</dimen>
+</resources>

app/src/main/res/values-night/themes.xml

@@ -0,0 +1,17 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.Banvor" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/secondary</item>
+        <item name="colorPrimaryVariant">@color/secondary_variant</item>
+        <item name="colorOnPrimary">@color/on_secondary</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/primary</item>
+        <item name="colorSecondaryVariant">@color/primary_variant</item>
+        <item name="colorOnSecondary">@color/on_primary</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+        <item name="android:background">@color/secondary_bg</item>
+    </style>
+</resources>

app/src/main/res/values-w1240dp/dimens.xml

@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="fab_margin">200dp</dimen>
+</resources>

app/src/main/res/values-w600dp/dimens.xml

@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="fab_margin">48dp</dimen>
+</resources>

app/src/main/res/values/colors.xml

@@ -18,6 +18,18 @@
 */
 -->
 <resources>
-    <color name="main_menu_btn_bg">#80404040</color>
+    <color name="transparent">#00000000</color>
+    <color name="blure">#80000000</color>
+    <color name="welcome_btn_bg">#40FFFFFF</color>
     <color name="main_menu_btn_text">#C0C0C0C0</color>
+    <color name="puzzle_title">#FFFFE680</color>
+
+    <color name="primary">#FFC107</color>
+    <color name="primary_bg">#000000</color>
+    <color name="primary_variant">#FF5722</color>
+    <color name="secondary">#913213</color>
+    <color name="secondary_bg">#000000</color>
+    <color name="secondary_variant">#AA6601</color>
+    <color name="on_secondary">#661C17</color>
+    <color name="on_primary">#FF5722</color>
 </resources>

app/src/main/res/values/dimens.xml

@@ -1,5 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
-<!--
 /* 
 **
 ** Copyright 2008, The Android Open Source Project
@@ -23,4 +22,11 @@
     <dimen name="main_menu_btn_hmargin">10pt</dimen>
     <dimen name="main_menu_btn_vmargin">2pt</dimen>
     <dimen name="main_menu_btn_padding">10pt</dimen>
+    <dimen name="fab_margin">16dp</dimen>
+    <dimen name="puzzle_list_icon_size">100dp</dimen>
+    <dimen name="puzzle_list_number_size">50dp</dimen>
+    <!--  Puzzle number is aligned to right of this coordinate. -->
+    <dimen name="puzzle_list_number_x_coord">95dp</dimen>
+    <dimen name="puzzle_list_number_y_coord">95dp</dimen>
+
 </resources>

app/src/main/res/values/strings.xml

@@ -9,4 +9,9 @@
     <string name="btn_puzzles">Puzzles</string>
     <string name="version_tag">Version:</string>
     <string name="copyright">(c) 2013 Vahagn Khachatryan</string>
+    <string name="title_activity_welcome">WelcomeActivity</string>
+    <!-- Strings used for fragments for navigation -->
+    <string name="welcome_fragment_label">Welcome Fragment</string>
+    <string name="puzzle_list_fragment_label">Puzzle List Fragment</string>
+
 </resources>

app/src/main/res/values/themes.xml

@@ -0,0 +1,26 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.Banvor" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/primary</item>
+        <item name="colorPrimaryVariant">@color/primary_variant</item>
+        <item name="colorOnPrimary">@color/on_primary</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/secondary</item>
+        <item name="colorSecondaryVariant">@color/secondary_variant</item>
+        <item name="colorOnSecondary">@color/on_secondary</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+        <item name="android:background">@color/primary_bg</item>
+    </style>
+
+    <style name="NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
+
+    <style name="AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
+
+    <style name="PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
+</resources>

app/src/test/java/org/vostan/banvor/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package org.vostan.banvor;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}

build.gradle

@@ -1,15 +1,20 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     repositories {
-        jcenter()
+        google()
+        mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:0.13.2'
+        classpath "com.android.tools.build:gradle:7.0.2"
+
+        def nav_version = "2.3.5"
+        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
     }
 }
 
-allprojects {
+task clean(type: Delete) {
-    repositories {
+    delete rootProject.buildDir
-        jcenter()
-    }
 }

gradle.properties

@@ -0,0 +1,19 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Apr 10 15:27:10 PDT 2013
+#Mon Sep 20 22:54:36 BST 2021
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.1-all.zip
+zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -1,4 +1,20 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
 
 ##############################################################################
 ##
@@ -6,12 +22,30 @@
 ##
 ##############################################################################
 
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+# Attempt to set APP_HOME
-DEFAULT_JVM_OPTS=""
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
 
 APP_NAME="Gradle"
 APP_BASE_NAME=`basename "$0"`
 
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD="maximum"
 
@@ -30,6 +64,7 @@ die ( ) {
 cygwin=false
 msys=false
 darwin=false
+nonstop=false
 case "`uname`" in
   CYGWIN* )
     cygwin=true
@@ -40,33 +75,14 @@ case "`uname`" in
   MINGW* )
     msys=true
     ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
 esac
 
-# For Cygwin, ensure paths are in UNIX format before anything is touched.
-if $cygwin ; then
-    [ -n "$JAVA_HOME" ] && JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
-fi
-
-# Attempt to set APP_HOME
-# Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
-done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >&-
-APP_HOME="`pwd -P`"
-cd "$SAVED" >&-
-
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
+
 # Determine the Java command to use to start the JVM.
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
@@ -90,7 +106,7 @@ location of your Java installation."
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
     MAX_FD_LIMIT=`ulimit -H -n`
     if [ $? -eq 0 ] ; then
         if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
@@ -110,11 +126,13 @@ if $darwin; then
     GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
 fi
 
-# For Cygwin, switch paths to Windows format before running java
+# For Cygwin or MSYS, switch paths to Windows format before running java
-if $cygwin ; then
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
     APP_HOME=`cygpath --path --mixed "$APP_HOME"`
     CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
 
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
     # We build the pattern for arguments to be converted via cygpath
     ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
     SEP=""
@@ -138,27 +156,30 @@ if $cygwin ; then
         else
             eval `echo args$i`="\"$arg\""
         fi
-        i=$((i+1))
+        i=`expr $i + 1`
     done
     case $i in
-        (0) set -- ;;
+        0) set -- ;;
-        (1) set -- "$args0" ;;
+        1) set -- "$args0" ;;
-        (2) set -- "$args0" "$args1" ;;
+        2) set -- "$args0" "$args1" ;;
-        (3) set -- "$args0" "$args1" "$args2" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
-        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
     esac
 fi
 
-# Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules
+# Escape application args
-function splitJvmOpts() {
+save () {
-    JVM_OPTS=("$@")
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
 }
-eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
+APP_ARGS=`save "$@"`
-JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
 
-exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -1,3 +1,19 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
 @if "%DEBUG%" == "" @echo off
 @rem ##########################################################################
 @rem
@@ -8,20 +24,23 @@
 @rem Set local scope for the variables with windows NT shell
 if "%OS%"=="Windows_NT" setlocal
 
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS=
-
 set DIRNAME=%~dp0
 if "%DIRNAME%" == "" set DIRNAME=.
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
 @rem Find java.exe
 if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto init
+if "%ERRORLEVEL%" == "0" goto execute
 
 echo.
 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
@@ -35,7 +54,7 @@ goto fail
 set JAVA_HOME=%JAVA_HOME:"=%
 set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
-if exist "%JAVA_EXE%" goto init
+if exist "%JAVA_EXE%" goto execute
 
 echo.
 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
@@ -45,34 +64,14 @@ echo location of your Java installation.
 
 goto fail
 
-:init
-@rem Get command-line arguments, handling Windowz variants
-
-if not "%OS%" == "Windows_NT" goto win9xME_args
-if "%@eval[2+2]" == "4" goto 4NT_args
-
-:win9xME_args
-@rem Slurp the command line arguments.
-set CMD_LINE_ARGS=
-set _SKIP=2
-
-:win9xME_args_slurp
-if "x%~1" == "x" goto execute
-
-set CMD_LINE_ARGS=%*
-goto execute
-
-:4NT_args
-@rem Get arguments from the 4NT Shell from JP Software
-set CMD_LINE_ARGS=%$
-
 :execute
 @rem Setup the command line
 
 set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
+
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
 
 :end
 @rem End local scope for the variables with windows NT shell

settings.gradle

@@ -1 +1,10 @@
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+        jcenter() // Warning: this repository is going to shut down soon
+    }
+}
+rootProject.name = "banvor"
 include ':app'