Fragment的生命周期以及切换时得状态

Fragment一共拥有11个生命周期：

onAttach                         //Fragment和Activity关联
onCreate                        //创建Fragment
onCreateView                   //创建Fragment的视图
onActivityCreated             //初始化元素
onStart()                    //启动
onResume                    //获取焦点
onPause                    //失去焦点
onStop                    //停止或时间长移除
onDestroyView            //移除视图
onDestroy               //销毁
onDetach               //取消Fragment和Activity的关联

add时fragment和activity的生命周期执行

1. Activity --> onCreate()
2. Fragment --> onAttach()
3. Fragment --> onCreate()
4. Fragment --> onCreateView()
5. Fragment --> onActivityCreated()
6. Fragment --> onStart()
7. Activity --> onResume()
8. Fragment --> onResume()

replace时生命周期执行

1. 新Fragment --> onAttach()
2. 新Fragment --> onCreate()
3. 旧Fragment --> onPause()
4. 旧Fragment --> onStop()
5. 旧Fragment --> onDestroyView()
6. 旧Fragment --> onDesttoy()
7. 旧Fragment --> onDetach()
8. 新Fragment --> onCreateView()
9. 新Fragment --> onActivityCreated()
10. 新Fragment --> onStart()
11. 新Fragment --> onResume()

remove时生命周期执行
1.onPause()
2.onStop()
3.onDestoryView()
4.onDestory()
5.onDetach()

切换Fragment

1. onAttach
2. onCreate
3. onCreateView
4. onActivityCreated
5. onStart
6. onResume

屏幕灭掉：

1. onPause
2. onSaveInstanceState
3. onStop

屏幕解锁

1. onStart
2. onResume

回到桌面

1. onPause
2. onSaveInstanceState
3. onStop

回到应用

1. onStart
2. onResume

退出应用

1. onPause
2. onStop
3. onDestroyView
4. onDestroy