出错情景：
在Activity 中嵌套Fragment1，然后又在Fragemngt1中嵌套，FragmentA,FragmentB,FragmentC,然后将Fragment1中几个被嵌套的frg点一遍，然后销毁所有Activity，退出整个App的时候崩溃。
1.在Fragment1中应用getChildFragmentManager();添加子Fragemnt,而不是用getActivity().getSupportFragmentManager();
2.在Fragment1中重写onDestroyView()方法，注意不是onDestroy()
二者的区别在于：
onDestory():已经摆脱了与Activity的连接onDestroyView()：与Activity仍有连接
onDestroyView()
java.lang.IllegalStateException: The content of the adapt...
Causedby: java.lang.IllegalStateException:ThisActivityalr...
Caused by: java.lang.IllegalStateException: UiAutomationS...
java.lang.IllegalStateException: Software rendering doesn...
java.lang.IllegalStateException: Could not evaluate condi...
Caused by: java.lang.IllegalStateException: Immutable bit...
java.lang.IllegalStateException: Can not perform this act...
问题： Caused by: java.lang.IllegalStateException: No host a...
问题: java.lang.IllegalStateException: Fragment MusicNetFra...
java.lang.IllegalStateException:Can not perform this acti...
本文标题：Java.lang.IllegalStateException
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