You need to use a Theme.AppCompat theme (or descendant) with this activity. Change to Theme.AppCompat causes other error

Question

I use appcompat v22.1.0 in my App and use Toolbar. Everything was fine when I use Theme.AppCompat.Light.NoActionBar. When I start implement AlertDialog

Answer 1

The probem is because of Context which You are passing to build the Alert Dialog.Don't Use getApplicationContext().Try using your Activity context.Use AlertDialog.Builder builder = new AlertDialog.Builder(MainActiviy.this);