如何在安卓系统中设置全屏VideoView而不产生新的活动

VideoView videoView = findViewById(R.id.videoView);
videoView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
    } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
    }
}

<activity
    android:name=".YourActivity"
    android:configChanges="keyboardHidden|orientation|screenSize"
    android:screenOrientation="portrait" />