Android - How to show App logo in action bar

This works for me with Theme.Light

android.support.v7.app.ActionBar menu = getSupportActionBar();
menu.setDisplayShowHomeEnabled(true);
menu.setLogo(R.drawable.ic_launcher);
menu.setDisplayUseLogoEnabled(true);

The actionbar uses the android:logo attribute from manifest file. Then use setDisplayUseLogoEnabled() to set it in the ActionBar