Agent's unfinished attempt to convert the project from AppCompat to AndroidX.

app/src/main/AndroidManifest.xml

@@ -2,8 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
-    <!-- Include required permissions for Google Mobile Ads to run. -->
-    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-sdk android:minSdkVersion="21" />    <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
     <application

app/src/main/java/com/hyperling/apps/games/GameActivity.java

@@ -1,7 +1,7 @@
 package com.hyperling.apps.games;
 
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.view.Window;
 import android.view.WindowManager;
 

app/src/main/java/com/hyperling/apps/games/HighScoreActivity.java

@@ -1,7 +1,7 @@
 package com.hyperling.apps.games;
 
 import android.content.SharedPreferences;
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.widget.LinearLayout;

app/src/main/java/com/hyperling/apps/games/MainActivity.java

@@ -2,7 +2,7 @@ package com.hyperling.apps.games;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;

app/src/main/java/com/hyperling/apps/games/OptionsActivity.java

@@ -3,7 +3,7 @@ package com.hyperling.apps.games;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.Button;