如何正确隐藏Android API 30的状态栏？

<application
    ...
    android:theme="@style/Theme.AppCompat.Light.NoActionBar">
    ...
</application>

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
    getWindow().getDecorView().getWindowInsetsController().hide(WindowInsets.Type.statusBars());
} else {
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
}

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if (hasFocus && Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        getWindow().getDecorView().getWindowInsetsController().hide(WindowInsets.Type.statusBars());
    }
}