Show black preview screen in task manager on ICS

问题:

I want to show a black screen in the task manager preview under Ice Cream Sandwich, like the German 'finanzstatus' app does. It would be nice if someone could point me in the right direction.

回答1:

Using FLAG_SECURE will block your app from screenshots, including the recent tasks list:

public class FlagSecureTestActivity extends Activity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    getWindow().setFlags(LayoutParams.FLAG_SECURE,
                         LayoutParams.FLAG_SECURE);

    setContentView(R.layout.main);
  }
}