AlertDialog出现时隐藏导航按钮

Question

无法在AlertDialog中隐藏导航按钮

在ProgressDialog中完成它-在onStart（）中，它可以很好地工作，但是在AlertDialog中，它将无法工作。

public class OwnAlertDialog extends AlertDialog {
protected OwnAlertDialog(Context context) {
    super(context);
}

protected OwnAlertDialog(Context context, boolean cancelable, OnCancelListener cancelListener) {
    super(context, cancelable, cancelListener);
}

public OwnAlertDialog(Context context, int themeResId) {
    super(context, themeResId);
}

@Override
public void onStart() {
    super.onStart();
    Window window = this.getWindow();
    window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
    int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN;
    window.getDecorView().setSystemUiVisibility(uiOptions);

    View decorView = getWindow().getDecorView();
    decorView.setOnSystemUiVisibilityChangeListener
            (visibility -> {
                if ((visibility & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0) {
                    decorView.setSystemUiVisibility(uiOptions);
                }
            });
}

@Override
public void show() {
    // Set the dialog to not focusable.
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);

    // Show the dialog with NavBar hidden.
    super.show();

    // Set the dialog to focusable again.
    getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
}
}       

导航按钮显示为隐藏...