apptheme android studio add actionbar code example

Example 1: getsupportactionbar activity

ActionBar mActionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();

Example 2: android java display icon in action bar

getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setLogo(R.mipmap.ic_launcher);
getSupportActionBar().setDisplayUseLogoEnabled(true);