houtrry / ActivityLifeCycleSamples

Android Activity生命周期小结

ActivityLifeCycleSamples

运行日志

MainActivity创建

D/MainActivity: onCreate----------------> 创建界面 -->onCreate(savedInstanceState), savedInstanceState: null
D/MainActivity: onStart---> 用户可见
D/MainActivity: onResume---> 得到焦点
D/MainActivity: onPostResume--->
D/MainActivity: onAttachedToWindow---------------->
D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true

MainActivity跳转到Main2Activity

D/MainActivity: onPause---> 失去焦点
D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: false
D/Main2Activity: onCreate----------------> 创建界面 -->onCreate(savedInstanceState), savedInstanceState: null
D/Main2Activity: onStart---> 用户可见
D/Main2Activity: onResume---> 得到焦点
D/Main2Activity: onPostResume--->
D/Main2Activity: onAttachedToWindow---------------->
D/Main2Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true
D/MainActivity: onSaveInstanceState---------------> 开始保存界面的数据, .onSaveInstanceState(outState), outState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@212f37f2, 2131427405=android.view.AbsSavedState$1@212f37f2, 2131427406=android.view.AbsSavedState$1@212f37f2, 2131427407=android.support.v7.widget.Toolbar$SavedState@3b52be43, 2131427408=android.view.AbsSavedState$1@212f37f2}}]}]
D/MainActivity: onStop---> 用户不可见

Main2Activity点击返回按钮

D/Main2Activity: onPause---> 失去焦点
D/MainActivity: onRestart-----> 重新回到前台
D/MainActivity: onStart---> 用户可见
D/MainActivity: onResume---> 得到焦点
D/MainActivity: onPostResume--->
D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true
D/Main2Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: false
D/Main2Activity: onStop---> 用户不可见
D/Main2Activity: onDestroy---> 界面销毁
D/Main2Activity: onDetachedFromWindow---------------->

再次MainActivity跳转到Main2Activity

D/MainActivity: onPause---> 失去焦点
D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: false
D/Main2Activity: onCreate----------------> 创建界面 -->onCreate(savedInstanceState), savedInstanceState: null
D/Main2Activity: onStart---> 用户可见
D/Main2Activity: onResume---> 得到焦点
D/Main2Activity: onPostResume--->
D/Main2Activity: onAttachedToWindow---------------->
D/Main2Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true
D/MainActivity: onSaveInstanceState---------------> 开始保存界面的数据, .onSaveInstanceState(outState), outState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@212f37f2, 2131427405=android.view.AbsSavedState$1@212f37f2, 2131427406=android.view.AbsSavedState$1@212f37f2, 2131427407=android.support.v7.widget.Toolbar$SavedState@10b1faa1, 2131427408=android.view.AbsSavedState$1@212f37f2}}]}]
D/MainActivity: onStop---> 用户不可见

点击按钮调finish(), 销毁Main2Activity

D/Main2Activity: onPause---> 失去焦点
D/MainActivity: onRestart-----> 重新回到前台
D/MainActivity: onStart---> 用户可见
D/MainActivity: onResume---> 得到焦点
D/MainActivity: onPostResume--->
D/Main2Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: false
D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true
D/Main2Activity: onStop---> 用户不可见
D/Main2Activity: onDestroy---> 界面销毁
D/Main2Activity: onDetachedFromWindow---------------->

从MainActivity跳转到Main3Activity

D/MainActivity: onPause---> 失去焦点
D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: false
D/Main3Activity: onCreate----------------> 创建界面 -->onCreate(savedInstanceState), savedInstanceState: null
D/Main3Activity: onStart---> 用户可见
D/Main3Activity: onResume---> 得到焦点
D/Main3Activity: onPostResume--->
D/Main3Activity: onAttachedToWindow---------------->
D/Main3Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true
D/MainActivity: onSaveInstanceState---------------> 开始保存界面的数据, .onSaveInstanceState(outState), outState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@212f37f2, 2131427405=android.view.AbsSavedState$1@212f37f2, 2131427406=android.view.AbsSavedState$1@212f37f2, 2131427407=android.support.v7.widget.Toolbar$SavedState@3cb8da0a, 2131427408=android.view.AbsSavedState$1@212f37f2}}]}]
D/MainActivity: onStop---> 用户不可见

显示Dialog

D/Main3Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: false

隐藏Dialog

D/Main3Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true

显示Toast

Toast已显示, 没走生命周期方法

Main3Activity崩溃, 重新创建

D/MainActivity: onCreate----------------> 创建界面 -->onCreate(savedInstanceState), savedInstanceState: Bundle[{android:viewHierarchyState=Bundle[mParcelledData.dataSize=528]}]
D/MainActivity: onStart---> 用户可见
D/MainActivity: onRestoreInstanceState------------> 开始恢复界面的数据-->onRestoreInstanceState(savedInstanceState), savedInstanceState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@180892, 2131427405=android.view.AbsSavedState$1@180892, 2131427406=android.view.AbsSavedState$1@180892, 2131427407=android.support.v7.widget.Toolbar$SavedState@fc45263, 2131427408=android.view.AbsSavedState$1@180892}}]}]
D/MainActivity: onResume---> 得到焦点
D/MainActivity: onPostResume--->
D/MainActivity: onAttachedToWindow---------------->
D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true

Main4Activity屏幕旋转

D/Main4Activity: onPause---> 失去焦点
E/Main4Activity: onSaveInstanceState---------------> 开始保存界面的数据, .onSaveInstanceState(outState), outState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@212f37f2, 2131427405=android.view.AbsSavedState$1@212f37f2, 2131427406=android.view.AbsSavedState$1@212f37f2, 2131427407=android.support.v7.widget.Toolbar$SavedState@23059cc0, 2131427408=android.view.AbsSavedState$1@212f37f2}}]}]
D/Main4Activity: onStop---> 用户不可见
D/Main4Activity: onDestroy---> 界面销毁
D/Main4Activity: onDetachedFromWindow---------------->
D/Main4Activity: onCreate----------------> 创建界面 -->onCreate(savedInstanceState), savedInstanceState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@212f37f2, 2131427405=android.view.AbsSavedState$1@212f37f2, 2131427406=android.view.AbsSavedState$1@212f37f2, 2131427407=android.support.v7.widget.Toolbar$SavedState@23059cc0, 2131427408=android.view.AbsSavedState$1@212f37f2}}]}]
D/Main4Activity: onStart---> 用户可见
E/Main4Activity: onRestoreInstanceState------------> 开始恢复界面的数据-->onRestoreInstanceState(savedInstanceState), savedInstanceState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@212f37f2, 2131427405=android.view.AbsSavedState$1@212f37f2, 2131427406=android.view.AbsSavedState$1@212f37f2, 2131427407=android.support.v7.widget.Toolbar$SavedState@23059cc0, 2131427408=android.view.AbsSavedState$1@212f37f2}}]}]
D/Main4Activity: onResume---> 得到焦点
D/Main4Activity: onPostResume--->
D/Main4Activity: onAttachedToWindow---------------->
D/Main4Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true

Main3Activity 点击home键

03-16 14:17:10.882 32204-32204/com.houtrry.activitylifeciycledemo D/Main3Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: false
03-16 14:17:10.920 32204-32204/com.houtrry.activitylifeciycledemo D/Main3Activity: onPause---> 失去焦点
03-16 14:17:11.338 32204-32204/com.houtrry.activitylifeciycledemo E/Main3Activity: onSaveInstanceState---------------> 开始保存界面的数据, .onSaveInstanceState(outState), outState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@3c0dff9, 2131427405=android.view.AbsSavedState$1@3c0dff9, 2131427406=android.view.AbsSavedState$1@3c0dff9, 2131427407=android.support.v7.widget.Toolbar$SavedState@d970d08, 2131427408=android.view.AbsSavedState$1@3c0dff9, 2131427422=android.view.AbsSavedState$1@3c0dff9, 2131427423=android.view.AbsSavedState$1@3c0dff9, 2131427424=android.view.AbsSavedState$1@3c0dff9, 2131427425=android.view.AbsSavedState$1@3c0dff9, 2131427426=android.view.AbsSavedState$1@3c0dff9}}]}]
03-16 14:17:11.338 32204-32204/com.houtrry.activitylifeciycledemo D/Main3Activity: onStop---> 用户不可见

Main3Activity 点击home键后，再次进入app

03-16 14:17:21.479 32204-32204/com.houtrry.activitylifeciycledemo D/Main3Activity: onRestart-----> 重新回到前台
03-16 14:17:21.487 32204-32204/com.houtrry.activitylifeciycledemo D/Main3Activity: onStart---> 用户可见
03-16 14:17:21.487 32204-32204/com.houtrry.activitylifeciycledemo D/Main3Activity: onResume---> 得到焦点
03-16 14:17:21.488 32204-32204/com.houtrry.activitylifeciycledemo D/Main3Activity: onPostResume--->
03-16 14:17:21.516 32204-32204/com.houtrry.activitylifeciycledemo D/Main3Activity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true

MainActivity 直接锁屏

03-16 14:35:53.203 847-847/com.houtrry.activitylifeciycledemo D/MainActivity: onPause---> 失去焦点
03-16 14:35:53.223 847-847/com.houtrry.activitylifeciycledemo E/MainActivity: onSaveInstanceState---------------> 开始保存界面的数据, .onSaveInstanceState(outState), outState: Bundle[{android:viewHierarchyState=Bundle[{android:views={16908290=android.view.AbsSavedState$1@e09952e, 2131427405=android.view.AbsSavedState$1@e09952e, 2131427406=android.view.AbsSavedState$1@e09952e, 2131427407=android.support.v7.widget.Toolbar$SavedState@51cb8cf, 2131427408=android.view.AbsSavedState$1@e09952e}}]}]
03-16 14:35:53.223 847-847/com.houtrry.activitylifeciycledemo D/MainActivity: onStop---> 用户不可见
03-16 14:35:54.222 847-847/com.houtrry.activitylifeciycledemo D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: false

MainActivity 解锁屏幕

03-16 14:36:51.213 847-847/com.houtrry.activitylifeciycledemo D/MainActivity: onRestart-----> 重新回到前台
03-16 14:36:51.227 847-847/com.houtrry.activitylifeciycledemo D/MainActivity: onStart---> 用户可见
03-16 14:36:51.229 847-847/com.houtrry.activitylifeciycledemo D/MainActivity: onResume---> 得到焦点
03-16 14:36:51.229 847-847/com.houtrry.activitylifeciycledemo D/MainActivity: onPostResume--->
03-16 14:36:51.311 847-847/com.houtrry.activitylifeciycledemo D/MainActivity: onWindowFocusChanged---------------> 用户焦点发生变化, hasFocus: true

总结

• 屏幕旋转时, 执行的方法顺序为:
  onPause --> onSaveInstanceState --> onStop --> onDestroy --> onDetachedFromWindow --> onCreate --> onStart --> onRestoreInstanceState -->onResume -->onAttachedToWindow --> onWindowFoucsChanged.
• onSaveInstanceState方法执行在onPause和onStop之间. 对应的, onRestoreInstanceState执行在onStart和onResume之间.
• 从B页面点击返回按钮返回到A页面或者B页面调用finish方法返回到A页面, 方法都是
  onPause(B) --> onRestart(A) --> onStart(A) --> onResume(A) --> onStop(B) -->onDestroy(B)
• 从A页面跳转到B页面时, 方法是
  onPause(A) --> onCreate(B) --> onStart(B) --> onResume(B) --> onSaveInstanceState(A) --> onStop(A)
• onWindowFoucsChanged 方法执行在onResume和onPause方法之后, 在onStop之前.
• 从A页面跳转到B页面,
  A会在onPause之后立刻执行onWindowFoucsChanged(false), 从而失去焦点.B在onResume后获取焦点.
  从B页面返回到A页面,
  A/B均是在B的onStop方法之前执行onWindowFoucsChanged, 两个onWindowFoucsChanged顺序不一定.