Change action bar color in android

Question

I am using the app theme Theme.Black in my app. In this theme the action bar is gray. How I can change color of my action bar? This is my attempt:

Answer 1

if you have in your layout activity_main

you have to put

in your Activity this code

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    toolbar.setBackgroundColor(Color.CYAN);
}