fragment必须是依存于activity而存在的，因此activity的生命周期会直接影响到fragment的生命周期。官网这张图很好的说明了俩者的关系：
可以看到fragment比activity多了几个额外的生命周期回调函数：
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onattach(activity); //当activity与fragment发生关联时调用
oncreateview(layoutinflater,viewgroup,bundle); //创建该fragment的视图
onactivitycreate(bundle); //当activity的oncreate()；方法返回时调用
ondestoryview(); //与oncreateview相对应，当改fragment被移除时调用
ondetach(); //与onattach()相对应，当fragment与activity的关联被取消时调用
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注意：除了oncreateview，其他的所有方法如果你重写了，必须调用父类对于该方法的实现。
场景演示 :
切换到该fragment
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11-29 14:26:35.095: d/applistfragment(7649): onattach
11-29 14:26:35.095: d/applistfragment(7649): oncreate
11-29 14:26:35.095: d/applistfragment(7649): oncreateview
11-29 14:26:35.100: d/applistfragment(7649): onactivitycreated
11-29 14:26:35.120: d/applistfragment(7649): onstart
11-29 14:26:35.120: d/applistfragment(7649): onresume
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屏幕灭掉：
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11-29 14:27:35.185: d/applistfragment(7649): onpause
11-29 14:27:35.205: d/applistfragment(7649): onsaveinstancestate
11-29 14:27:35.205: d/applistfragment(7649): onstop
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屏幕解锁
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11-29 14:33:13.240: d/applistfragment(7649): onstart
11-29 14:33:13.275: d/applistfragment(7649): onresume
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切换到其他fragment:
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11-29 14:33:33.655: d/applistfragment(7649): onpause
11-29 14:33:33.655: d/applistfragment(7649): onstop
11-29 14:33:33.660: d/applistfragment(7649): ondestroyview
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切换回本身的fragment:
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11-29 14:33:55.820: d/applistfragment(7649): oncreateview
11-29 14:33:55.825: d/applistfragment(7649): onactivitycreated
11-29 14:33:55.825: d/applistfragment(7649): onstart
11-29 14:33:55.825: d/applistfragment(7649): onresume
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回到桌面
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11-29 14:34:26.590: d/applistfragment(7649): onpause
11-29 14:34:26.880: d/applistfragment(7649): onsaveinstancestate
11-29 14:34:26.880: d/applistfragment(7649): onstop
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回到应用
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11-29 14:36:51.940: d/applistfragment(7649): onstart
11-29 14:36:51.940: d/applistfragment(7649): onresume
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退出应用
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11-29 14:37:03.020: d/applistfragment(7649): onpause
11-29 14:37:03.155: d/applistfragment(7649): onstop
11-29 14:37:03.155: d/applistfragment(7649): ondestroyview
11-29 14:37:03.165: d/applistfragment(7649): ondestroy
11-29 14:37:03.165: d/applistfragment(7649): ondetach
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比activity多了一些生命周期，完整和activity对接上，大家好好利用。