DialogFragment在按下主页后解散或隐藏

Question

我正在显示一个不可取消的dialogFragment。但是当我按下主页按钮或锁定屏幕并返回我的应用程序时，dialogFragment消失了。之后我可以单击后退按钮，当我单击后退按钮并再次返回应用程序时，会再次出现对话框片段...

private void showRoutePauseDialog() {

    FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
    Fragment prev = getFragmentManager().findFragmentByTag(RouteActivityPausedDialogFragment.TAG);
    if (prev != null) {
        ft.remove(prev);
    }
    ft.commit();

    routeActivityPausedDialogFragment = new RouteActivityPausedDialogFragment();
    routeActivityPausedDialogFragment.setListener(this);
    routeActivityPausedDialogFragment.setCancelable(false);
    routeActivityPausedDialogFragment.show(getActivity().getSupportFragmentManager(), RouteActivityPausedDialogFragment.TAG);
}

仅在此对话框片段中发生这种情况。我在这个片段中有其他dialogFragments并且它们工作正常...我还注意到如果我显示另一个dialogFragment（一个工作正常）并按home并返回到应用程序，之后显示RouteActivityPausedDialogFragment并按Home并返回然后此dialogFragment也行得很好......