In first class AppActivity you set on button click listener to go to App2Activity, row:
Intent intent = new Intent(context, App2Activity.class);
Your another class is activity named PlayIt. You should change upper row to:
Intent intent = new Intent(context, PlayIt.class);
Another thing, Activity PlayIt should report error because you need to put setContenView(R.layout.your_layout) before using findViewById()
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