This Activity already has an action bar supplied by the window decor (FEATURE_ACTION_BAR)

Question

This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_ACTION_BAR and set windowActionBar to false in your theme to use a Toolba

Answer 1

Use style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar" and everywhere use the same Theme as this maintain flow of Context to Android as it do not get confused between two ActionBar.