Source code for video tutorials of "Android 基础教程" on bilibili (longway777)
原视频录制的时候因为ViewModel-SavedState是较低的alpha版本，后来api改了，这里做了一个更新。 另外，在视频中似乎没有考虑屏幕翻转时候的界面保存，这里也做了修正。
当进入LoseFragment时，点击按钮返回
Navigation.findNavController(v).navigate(R.id.action_loseFragment_to_titleFragment);
这个时候会发现点击手机返回按键，又会回到LoseFragment，这是不合理的
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