android 温故知新之fragment中易忽视的onViewStateRestored（）

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本文详细介绍了Android中Fragment的生命周期，包括onAttach、onCreate、onCreateView等关键方法的作用及调用时机，并补充了onViewStateRestored方法的相关内容。

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回顾知识，发现问题！

看了很多网上关于fragment的讲解教程，发现很多都少了onViewStateRestored()这个周期，在此补充。

参考：http://www.android-doc.com/reference/android/app/Fragment.html#Lifecycle，做如下翻译，不足忘回馈。

onAttach(Activity) ：
    called once the fragment is associated with its activity.
    调用该方法，将fragment与activity相关联

onCreate(Bundle) ：
    called to do initial creation of the fragment.
    调用该方法，将fragment初始化；

onCreateView(LayoutInflater, ViewGroup, Bundle) ：
    creates and returns the view hierarchy associated with the fragment.
    调用该方法，创建视图，返回结果View；

onActivityCreated(Bundle):
    tells the fragment that its activity has completed its own Activity.onCreate().
    调用该方法，通知fragment，activity中的oncreate()方法已完成；

onViewStateRestored(Bundle)：
    tells the fragment that all of the saved state of its view hierarchy has been restored.  
    调用该方法，通知fragment，该视图层已保存；

onStart()：
    makes the fragment visible to the user (based on its containing activity being started).
    调用该方法，和activity的started方法相关联，将fragment展示给用户；

onResume()：
    makes the fragment interacting with the user (based on its containing activity being resumed). 
    调用该方法，和activity的resumed方法相关联，使fragment与用户交互；

As a fragment is no longer being used, it goes through a reverse series of callbacks:
调用以下的方法，fragment将不再被使用；

onPause()：
    fragment is no longer interacting with the user either because its activity is being paused or a fragment operation is modifying it in the activity.
    调用该方法，fragment不与用户进行交互，此时activity的paused方法被调用，或者fragment正在被activity修改；

onStop()：
    fragment is no longer visible to the user either because its activity is being stopped or a fragment operation is modifying it in the activity.
    调用该方法，fragment不再展示，此时activity的stopped方法被调用，或者fragment正在被activity修改；

onDestroyView()：
    allows the fragment to clean up resources associated with its View.
    调用该方法，fragment清除掉资源与该activity的关联；

onDestroy() ：
    called to do final cleanup of the fragment's state.
    调用该方法，清除fragment的状态；

onDetach()：
    called immediately prior to the fragment no longer being associated with its activity. 
    调用该方法，清除fragment与该activity的关联；