[Error]requestFeature() must be called before adding content

requestFeature() must be called before adding content

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().requestFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
    setContentView(R.layout.activity_menu);
}

setContentView()위에 getWindow().requestFeature()를 먼저해주자.