IllegalStateException: Can not perform this action after onSaveInstanceState
可能的原因之一：
Fragment 在显示或者隐藏，移除是出现Can not perform this action after onSaveInstanceState #解决办法：onSaveInstanceState方法是在该Activity即将被销毁前调用，来保存Activity数据的，如果在保存玩状态后 再给它添加Fragment就会出错。解决办法就是把commit（）方法替换成 commitAllowingStateLoss()
可能的原因之二：Activity被系统回收之后，重建时恢复缓存的Fragment的原因 #解决办法之一：在Activity 回收时 onSaveInstanceState 中不缓存Fragment ,在OnCreate 中移除缓存相应Fragment数据，代码如下
private static final String BUNDLE_FRAGMENTS_KEY = "android:support:fragments"; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { if (savedInstanceState != null && this.clearFragmentsTag()) { //重建时清除 fragment的状态 savedInstanceState.remove(BUNDLE_FRAGMENTS_KEY); } super.onCreate(savedInstanceState); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (outState != null && this.clearFragmentsTag()) { //销毁时不保存fragment的状态 outState.remove(BUNDLE_FRAGMENTS_KEY); } } protected boolean clearFragmentsTag() { return true; }
Can not perform this action after onSaveInstanceState
原文：https://www.cnblogs.com/huhe/p/12313518.html