android hide status bar and action bar daynamically

1import androidx.appcompat.app.AppCompatActivity;
2import android.os.Bundle;
3import android.view.Window;
4import android.view.WindowManager;
5public class MainActivity extends AppCompatActivity {
6   @Override
7   protected void onCreate(Bundle savedInstanceState) {
8      super.onCreate(savedInstanceState);
9      requestWindowFeature(Window.FEATURE_NO_TITLE);
10      getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
11      setContentView(R.layout.activity_main);
12   }
13}