Activity生命周期

1、运行activity
onCreate -- onStart -- onReaume
2、点击返回键
onPause -- onStop -- onDestory

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1、运行
2、点击Home
onPause--onStop
3、在桌面，长按Home重新回到ActivityLifeCycle
onRestart -- onStart -- onResume

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1、运行
2、切换至SecondActivity之上
onPause -- onStop
3、切换回AcitivityLifeCycle
onCreate -- onStart -- onResume
4、点击返回键时
onRestart -- onStart -- onResume
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创建一个对话框样式的activity:DialogActivity
1、运行
2、切换至DoalogActivity
onPause
3、按返回键返回至ActivityLifeCycle
onResume
--------------------
创建AlertDialog对话框
显示对话框并返回，发现此时并不能触发ActivityLifeCycle
实例的状态变化，其生命周期中任何函数

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添加
protected void onRestoreInstanceState(Bundle savedInstanceState){
super.onRestoreInstanceState(savedInstanceState);
Log.i(TAG, "OnRestoreInstanceState()");
}
protected void onSaveInstanceState(Bundle outState){
super.onRestoreInstanceState(outState);
Log.i(TAG, "OnSaveInstanceState()");
}
1、运行程序
2、按Home
onSaveInstanceState —— onPause —— OnStop
3、在桌面，长按Home重新回到ActivityLifeCyde
onRestart —— onStart —— onResume
注意：此时并没用触发onRestoreInstanceState()