Android,旋转设备时如何不破坏活动？

<activity android:name=".MainActivity"
android:configChanges="screenSize|smallestScreenSize|screenLayout|orientation"
android:launchMode="singleTask" 
android:supportsPictureInPicture="true" />

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
            // 当屏幕方向变为横向时，执行此处所写的代码
        } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
            // 当屏幕方向变为纵向时，执行此处所写的代码
        }
    }
}

public class MainActivity extends AppCompatActivity {
    private OrientationLock orientationLock;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        orientationLock = new OrientationLock(this);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
            // 当屏幕方向变为横向时，执行此处所写的代码
            orientationLock.lock();
        } else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
            // 当屏幕方向变为纵向时，执行此处所写的代码
            orientationLock.unlock();
        }
    }
}