Why getApplicationContext().setTheme() in a Activity does not work?

Question

i am currently have a hard time for calling to getApplicationContext().setTheme() in a activity, I just want to apply a theme resource in a application scope instead of activity scope in code style, but the trouble is that this does not work at all, can anybody explain to this.

Thanks a lot.!

He is the code skeleton:

public class StartUp extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
    /*
     * setTheme(android.R.style.Theme_Black_NoTitleBar_Fullscreen);
     * //that works!
     */
       this.getApplicationContext().setTheme(
            android.R.style.Theme_Black_NoTitleBar_Fullscreen);
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
    }
}

Answer 1

I had the same problem before and didn't find a way to fix this. Only god knows why, but I've even seen Android framework engineers (I believe it was Dianne Hackborn) say that setting themes like this is discouraged.

Set the theme for your Activity in the Manifest instead, and it will work.

Answer 2

you can use setTheme(..) before calling setContentView(...)and super.oncreate() and it should work fine