diff --git a/build.gradle b/build.gradle
index 7653fa4..501d988 100755
--- a/build.gradle
+++ b/build.gradle
@@ -1,11 +1,8 @@
 buildscript {
     ext.kotlin_version = '1.7.0'
     repositories {
-        jcenter()
-        maven {
-            url 'https://maven.google.com/'
-            name 'Google'
-        }
+        mavenCentral()
+        google()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:7.0.4'                        // Gradle
@@ -21,11 +18,8 @@ plugins {
 
 allprojects {
     repositories {
-        jcenter()
-        maven {
-            url 'https://maven.google.com/'
-            name 'Google'
-        }
+        mavenCentral()
+        google()
     }
 
     tasks.withType(Javadoc) {
diff --git a/demo/build.gradle b/demo/build.gradle
index a25bdfb..7bed00a 100755
--- a/demo/build.gradle
+++ b/demo/build.gradle
@@ -2,12 +2,12 @@ apply plugin: 'com.android.application'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 31
 
     defaultConfig {
         applicationId "dev.aspirasoft.apis.tiled.demo"
         minSdkVersion 15
-        targetSdkVersion 29
+        targetSdkVersion 31
         versionCode 1
         versionName "1.0.0"
     }
diff --git a/demo/src/main/AndroidManifest.xml b/demo/src/main/AndroidManifest.xml
index f7511ac..08e8fed 100755
--- a/demo/src/main/AndroidManifest.xml
+++ b/demo/src/main/AndroidManifest.xml
@@ -12,12 +12,14 @@
       android:theme="@style/AppTheme"
       tools:ignore="GoogleAppIndexingWarning">
 
-    <activity android:name=".MarioDemo">
-      <intent-filter>
-        <action android:name="android.intent.action.MAIN"/>
-        <category android:name="android.intent.category.LAUNCHER"/>
-      </intent-filter>
-    </activity>
+      <activity
+          android:name=".YoshiDemo"
+          android:exported="true">
+          <intent-filter>
+              <action android:name="android.intent.action.MAIN" />
+              <category android:name="android.intent.category.LAUNCHER" />
+          </intent-filter>
+      </activity>
   </application>
 
 </manifest>
\ No newline at end of file
diff --git a/tiles/src/main/java/dev/aspirasoft/apis/tiled/TiledView.kt b/tiles/src/main/java/dev/aspirasoft/apis/tiled/TiledView.kt
index c33b55c..52e72de 100755
--- a/tiles/src/main/java/dev/aspirasoft/apis/tiled/TiledView.kt
+++ b/tiles/src/main/java/dev/aspirasoft/apis/tiled/TiledView.kt
@@ -32,7 +32,8 @@ class TiledView(context: Context, attrs: AttributeSet?, defStyleAttr: Int) :
 
     private val lookupTable: HashMap<String, Int> = HashMap()
 
-    private lateinit var tileMap: TileMap
+    lateinit var map: TileMap
+        private set
 
     var pixelWidth: Double = 0.0
     var pixelHeight: Double = 0.0
@@ -114,7 +115,7 @@ class TiledView(context: Context, attrs: AttributeSet?, defStyleAttr: Int) :
         }
 
         val tileSize = calculateTileSize(rowCount, columnCount)
-        this.tileMap = TileMap(columnCount, rowCount, tileSize.first, tileSize.second)
+        this.map = TileMap(columnCount, rowCount, tileSize.first, tileSize.second)
 
         val grid = LinearLayout(context)
         grid.layoutParams = LayoutParams(
@@ -127,7 +128,7 @@ class TiledView(context: Context, attrs: AttributeSet?, defStyleAttr: Int) :
             val row = LinearLayout(context)
             row.layoutParams = LayoutParams(
                 ViewGroup.LayoutParams.WRAP_CONTENT,
-                this.tileMap.tileHeight.roundToInt()
+                this.map.tileHeight.roundToInt()
             )
             row.orientation = HORIZONTAL
 
@@ -136,12 +137,12 @@ class TiledView(context: Context, attrs: AttributeSet?, defStyleAttr: Int) :
                 val tileImage = ImageView(context)
                 tileImage.scaleType = ImageView.ScaleType.FIT_XY
                 tileImage.layoutParams = ViewGroup.LayoutParams(
-                    ceil(this.tileMap.tileWidth).roundToInt(),
-                    ceil(this.tileMap.tileHeight).roundToInt(),
+                    ceil(this.map.tileWidth).roundToInt(),
+                    ceil(this.map.tileHeight).roundToInt(),
                 )
 
                 row.addView(tileImage)
-                this.tileMap[c, r] = id
+                this.map[c, r] = id
                 lookupTable[id]?.let { tileImage.setImageResource(it) }
 
                 tileImage.setOnClickListener {
@@ -173,7 +174,7 @@ class TiledView(context: Context, attrs: AttributeSet?, defStyleAttr: Int) :
     @UiThread
     @Throws(IllegalArgumentException::class, IndexOutOfBoundsException::class)
     operator fun set(c: Int, r: Int, id: String) {
-        this.tileMap[c, r] = id
+        this.map[c, r] = id
 
         val tileImage = getViewAt(c, r)
         val resId = lookupTable[id]
@@ -191,21 +192,21 @@ class TiledView(context: Context, attrs: AttributeSet?, defStyleAttr: Int) :
      */
     @Throws(IndexOutOfBoundsException::class)
     operator fun get(c: Int, r: Int): String {
-        return tileMap[c, r]
+        return map[c, r]
     }
 
     /**
      * Column in which horizontal position [x] (in pixels) lies.
      */
     fun getColumn(x: Double): Int {
-        return (x / tileMap.tileWidth).toInt()
+        return (x / map.tileWidth).toInt()
     }
 
     /**
      * Row in which vertical position [y] (in pixels) lies.
      */
     fun getRow(y: Double): Int {
-        return (y / tileMap.tileHeight).toInt()
+        return (y / map.tileHeight).toInt()
     }
 
     private fun calculateTileSize(rowCount: Int, columnCount: Int): Pair<Double, Double> {
diff --git a/tiles/src/test/java/dev/aspirasoft/apis/tiled/TileMapTest.kt b/tiles/src/test/java/dev/aspirasoft/apis/tiled/TileMapTest.kt
index 8e864a7..93a8a9a 100644
--- a/tiles/src/test/java/dev/aspirasoft/apis/tiled/TileMapTest.kt
+++ b/tiles/src/test/java/dev/aspirasoft/apis/tiled/TileMapTest.kt
@@ -9,15 +9,15 @@ internal class TileMapTest {
     private val tilemap = TileMap(3, 3, 35.0, 25.0)
 
     init {
-        tilemap[0, 0] = 'a'
-        tilemap[0, 1] = 'b'
-        tilemap[0, 2] = 'c'
-        tilemap[1, 0] = 'd'
-        tilemap[1, 1] = 'e'
-        tilemap[1, 2] = 'f'
-        tilemap[2, 0] = 'g'
-        tilemap[2, 1] = 'h'
-        tilemap[2, 2] = 'i'
+        tilemap[0, 0] = "a"
+        tilemap[0, 1] = "b"
+        tilemap[0, 2] = "c"
+        tilemap[1, 0] = "d"
+        tilemap[1, 1] = "e"
+        tilemap[1, 2] = "f"
+        tilemap[2, 0] = "g"
+        tilemap[2, 1] = "h"
+        tilemap[2, 2] = "i"
     }
 
     @Test
@@ -32,15 +32,15 @@ internal class TileMapTest {
 
     @Test
     fun testTileMapData() {
-        assertEquals('a', tilemap[0, 0])
-        assertEquals('b', tilemap[0, 1])
-        assertEquals('c', tilemap[0, 2])
-        assertEquals('d', tilemap[1, 0])
-        assertEquals('e', tilemap[1, 1])
-        assertEquals('f', tilemap[1, 2])
-        assertEquals('g', tilemap[2, 0])
-        assertEquals('h', tilemap[2, 1])
-        assertEquals('i', tilemap[2, 2])
+        assertEquals("a", tilemap[0, 0])
+        assertEquals("b", tilemap[0, 1])
+        assertEquals("c", tilemap[0, 2])
+        assertEquals("d", tilemap[1, 0])
+        assertEquals("e", tilemap[1, 1])
+        assertEquals("f", tilemap[1, 2])
+        assertEquals("g", tilemap[2, 0])
+        assertEquals("h", tilemap[2, 1])
+        assertEquals("i", tilemap[2, 2])
 
         assertThrows(IndexOutOfBoundsException::class.java) { tilemap[-1, 0] }
         assertThrows(IndexOutOfBoundsException::class.java) { tilemap[0, -1] }