Activity生命週期事件實驗

突然發現最基礎的activity生命週期很重要，就決定作一些實驗，實驗在不一樣啓動模式下，Activity生命週期方法的調用時機

如下關於activity的生命週期實驗，是在2016.7.7，基於Android SDK VERSION 24 。

前面列出實驗的生命週期LOG，在最後寫出了分析總結。

1.Standard模式

這個標準模式是activity最經常使用的，啓動的生命週期方法變化你們也應該最熟悉

啓動StandardActivity：

com.example.lifecycle.StandardActivity---------onApplyThemeResource
com.example.lifecycle.StandardActivity---------onCreate
com.example.lifecycle.StandardActivity---------onContentChanged
com.example.lifecycle.StandardActivity---------onStart
com.example.lifecycle.StandardActivity---------onPostCreate
com.example.lifecycle.StandardActivity---------onResume
com.example.lifecycle.StandardActivity---------onPostResume
com.example.lifecycle.StandardActivity---------onAttachedToWindow
com.example.lifecycle.StandardActivity---------onWindowFocusChanged

而後按返回鍵：

com.example.lifecycle.StandardActivity---------finish
com.example.lifecycle.StandardActivity---------onPause
com.example.lifecycle.StandardActivity---------onWindowFocusChanged
com.example.lifecycle.StandardActivity---------onStop
com.example.lifecycle.StandardActivity---------onDestroy
com.example.lifecycle.StandardActivity---------onDetachedFromWindow

這樣一個StandardActivity的生命週期就結束了。

假如在StandardActivity resume的時候，按下Home鍵：

com.example.lifecycle.StandardActivity---------onUserLeaveHint
com.example.lifecycle.StandardActivity---------onPause
com.example.lifecycle.StandardActivity---------onWindowFocusChanged
com.example.lifecycle.StandardActivity---------onStop

而後再點擊應用圖標：

com.example.lifecycle.StandardActivity---------onRestart
com.example.lifecycle.StandardActivity---------onStart
com.example.lifecycle.StandardActivity---------onResume
com.example.lifecycle.StandardActivity---------onPostResume
com.example.lifecycle.StandardActivity---------onWindowFocusChanged

2.SingleTop模式

由StandardActivity跳轉到SingleTopActivity：

com.example.lifecycle.StandardActivity---------onUserLeaveHint
com.example.lifecycle.StandardActivity---------onPause
com.example.lifecycle.SingleTopActivity---------onApplyThemeResource
com.example.lifecycle.SingleTopActivity---------onCreate
com.example.lifecycle.SingleTopActivity---------onContentChanged
com.example.lifecycle.SingleTopActivity---------onStart
com.example.lifecycle.SingleTopActivity---------onPostCreate
com.example.lifecycle.SingleTopActivity---------onResume
com.example.lifecycle.SingleTopActivity---------onPostResume
com.example.lifecycle.SingleTopActivity---------onAttachedToWindow
com.example.lifecycle.SingleTopActivity---------onWindowFocusChanged
com.example.lifecycle.StandardActivity---------onWindowFocusChanged
com.example.lifecycle.StandardActivity---------onStop

由SingleTopActivity跳轉到該SingleTopActivity：

com.example.lifecycle.SingleTopActivity---------onPause
com.example.lifecycle.SingleTopActivity---------onNewIntent
com.example.lifecycle.SingleTopActivity---------onResume
com.example.lifecycle.SingleTopActivity---------onPostResume

而後再按返回鍵：

com.example.lifecycle.SingleTopActivity---------finish
com.example.lifecycle.SingleTopActivity---------onPause
com.example.lifecycle.StandardActivity---------onRestart
com.example.lifecycle.StandardActivity---------onStart
com.example.lifecycle.StandardActivity---------onResume
com.example.lifecycle.StandardActivity---------onPostResume
com.example.lifecycle.StandardActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTopActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTopActivity---------onStop
com.example.lifecycle.SingleTopActivity---------onDestroy
com.example.lifecycle.SingleTopActivity---------onDetachedFromWindow

3.SingleTask模式

由SingleTopActivity跳轉到SingleTaskActivity：

com.example.lifecycle.SingleTopActivity---------onUserLeaveHint
com.example.lifecycle.SingleTopActivity---------onPause
com.example.lifecycle.SingleTaskActivity---------onApplyThemeResource
com.example.lifecycle.SingleTaskActivity---------onCreate
com.example.lifecycle.SingleTaskActivity---------onContentChanged
com.example.lifecycle.SingleTaskActivity---------onStart
com.example.lifecycle.SingleTaskActivity---------onPostCreate
com.example.lifecycle.SingleTaskActivity---------onResume
com.example.lifecycle.SingleTaskActivity---------onPostResume
com.example.lifecycle.SingleTaskActivity---------onAttachedToWindow
com.example.lifecycle.SingleTaskActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTopActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTopActivity---------onStop

由SingleTaskActivity跳轉到該SingleTaskActivity：

com.example.lifecycle.SingleTaskActivity---------onPause
com.example.lifecycle.SingleTaskActivity---------onNewIntent
com.example.lifecycle.SingleTaskActivity---------onResume
com.example.lifecycle.SingleTaskActivity---------onPostResume

而後再按返回鍵：

com.example.lifecycle.SingleTaskActivity---------finish
com.example.lifecycle.SingleTaskActivity---------onPause
com.example.lifecycle.SingleTopActivity---------onRestart
com.example.lifecycle.SingleTopActivity---------onStart
com.example.lifecycle.SingleTopActivity---------onResume
com.example.lifecycle.SingleTopActivity---------onPostResume
com.example.lifecycle.SingleTopActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTaskActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTaskActivity---------onStop
com.example.lifecycle.SingleTaskActivity---------onDestroy
com.example.lifecycle.SingleTaskActivity---------onDetachedFromWindow

由SingleTaskActivity跳轉到SingleTopActivity，而後再跳轉到該SingleTaskActivity：

com.example.lifecycle.SingleTaskActivity---------onUserLeaveHint
com.example.lifecycle.SingleTaskActivity---------onPause
com.example.lifecycle.SingleTopActivity---------onApplyThemeResource
com.example.lifecycle.SingleTopActivity---------onCreate
com.example.lifecycle.SingleTopActivity---------onContentChanged
com.example.lifecycle.SingleTopActivity---------onStart
com.example.lifecycle.SingleTopActivity---------onPostCreate
com.example.lifecycle.SingleTopActivity---------onResume
com.example.lifecycle.SingleTopActivity---------onPostResume
com.example.lifecycle.SingleTopActivity---------onAttachedToWindow
com.example.lifecycle.SingleTopActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTaskActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTaskActivity---------onStop

//如下是再跳轉到該SingleTaskActivity
com.example.lifecycle.SingleTopActivity---------onPause
com.example.lifecycle.SingleTopActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTaskActivity---------onNewIntent
com.example.lifecycle.SingleTaskActivity---------onRestart
com.example.lifecycle.SingleTaskActivity---------onStart
com.example.lifecycle.SingleTaskActivity---------onResume
com.example.lifecycle.SingleTaskActivity---------onPostResume
com.example.lifecycle.SingleTaskActivity---------onWindowFocusChanged
com.example.lifecycle.SingleTopActivity---------onStop
com.example.lifecycle.SingleTopActivity---------onDestroy
com.example.lifecycle.SingleTopActivity---------onDetachedFromWindow

3.SingleInstance模式

由SingleTopActivity跳轉到SingleInstanceActivity：

com.example.lifecycle.StandardActivity---------onUserLeaveHint
com.example.lifecycle.StandardActivity---------onPause
com.example.lifecycle.SingleInstanceActivity---------onApplyThemeResource
com.example.lifecycle.SingleInstanceActivity---------onCreate
SingleInstanceActivity： getTaskId----------147
com.example.lifecycle.SingleInstanceActivity---------onContentChanged
com.example.lifecycle.SingleInstanceActivity---------onStart
com.example.lifecycle.SingleInstanceActivity---------onPostCreate
com.example.lifecycle.SingleInstanceActivity---------onResume
com.example.lifecycle.SingleInstanceActivity---------onPostResume
com.example.lifecycle.SingleInstanceActivity---------onAttachedToWindow
com.example.lifecycle.StandardActivity---------onWindowFocusChanged
com.example.lifecycle.SingleInstanceActivity---------onWindowFocusChanged
com.example.lifecycle.StandardActivity---------onStop

而後再啓動SingleInstanceActivity：

com.example.lifecycle.SingleInstanceActivity---------onPause
com.example.lifecycle.SingleInstanceActivity---------onNewIntent
com.example.lifecycle.SingleInstanceActivity---------onResume
                                                             --------- beginning of /dev/log/system
com.example.lifecycle.SingleInstanceActivity---------onPostResume

而後啓動StandardActivity：

com.example.lifecycle.SingleInstanceActivity---------onUserLeaveHint
com.example.lifecycle.SingleInstanceActivity---------onPause
com.example.lifecycle.StandardActivity---------onApplyThemeResource
com.example.lifecycle.StandardActivity---------onCreate
StandardActivity: getTaskId----------146
com.example.lifecycle.StandardActivity---------onContentChanged
com.example.lifecycle.StandardActivity---------onStart
com.example.lifecycle.StandardActivity---------onPostCreate
com.example.lifecycle.StandardActivity---------onResume
com.example.lifecycle.StandardActivity---------onPostResume
com.example.lifecycle.StandardActivity---------onAttachedToWindow
com.example.lifecycle.StandardActivity---------onWindowFocusChanged
com.example.lifecycle.SingleInstanceActivity---------onWindowFocusChanged
com.example.lifecycle.SingleInstanceActivity---------onStop

而後再啓動該SingleInstanceActivity：

com.example.lifecycle.StandardActivity---------onUserLeaveHint
com.example.lifecycle.StandardActivity---------onPause
com.example.lifecycle.SingleInstanceActivity---------onNewIntent
com.example.lifecycle.SingleInstanceActivity---------onRestart
com.example.lifecycle.SingleInstanceActivity---------onStart
com.example.lifecycle.SingleInstanceActivity---------onResume
com.example.lifecycle.SingleInstanceActivity---------onPostResume
com.example.lifecycle.SingleInstanceActivity---------onWindowFocusChanged
com.example.lifecycle.StandardActivity---------onWindowFocusChanged
com.example.lifecycle.StandardActivity---------onStop

總結

1.Standard模式的Activity啓動和退出，按照任務棧先進後出的原則，遵循正常的生命週期運轉。

2.SingleTop模式的Activity啓動和退出，和Standard模式大致同樣，區別在於若是該SingleTopActivity若是位於棧頂的話，再跳轉的話不會從新建立一個SingleTopActivity，這時的生命週期是onPause-----onNewIntent---------onResume。

3.SingleTask模式的Activity，若是再啓動時，任務棧裏面已經有了一個該Activity，那麼就不會建立新的SingleTaskActivity。這時若是該SingleTaskActivity在棧頂的話，和SingleTopActivity同樣走的生命週期是onPause-----onNewIntent---------onResume。若是SingleTaskActivity不在棧頂的話，會把它上面的Activity所有銷燬，此時SingleTaskActivity走的生命週期是onNewIntent---------onRestart----------onStart-----------onResume。

4.SingleInstance模式的Activity，區別於上面三種模式的一點是，SingleInstanceActivity的TaskId是單獨的一個，其餘三種模式的TaskId是同樣的在一個任務棧裏面。SingleInstanceActivity的生命週期和SingleTaskActivity的同樣，不過於SingleTaskActivity不一樣的一點是，若是Activity不在棧頂的話，SingleTaskActivity會把它上面的Activity所有銷燬，而SingleInstanceActivity會直接把SingleInstanceActivity調到棧頂而不會影響其餘的Activity，此時SingleInstanceActivity走的生命週期是onNewIntent---------onRestart----------onStart-----------onResume。