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                #APP啟動過程 --- ![](http://7xntdm.com1.z0.glb.clouddn.com/activity_start_flow.png) * 上圖就可以很好的說明App啟動的過程 * ActivityManagerService組織回退棧時以ActivityRecord為基本單位,所有的ActivityRecord放在同一個ArrayList里,可以將mHistory看作一個棧對象,索引0所指的對象位于棧底,索引mHistory.size()-1所指的對象位于棧頂 * Zygote進程孵化出新的應用進程后,會執行ActivityThread類的main方法.在該方法里會先準備好Looper和消息隊列,然后調用attach方法將應用進程綁定到ActivityManagerService,然后進入loop循環,不斷地讀取消息隊列里的消息,并分發消息。 * ActivityThread的main方法執行后,應用進程接下來通知ActivityManagerService應用進程已啟動,ActivityManagerService保存應用進程的一個代理對象,這樣ActivityManagerService可以通過這個代理對象控制應用進程,然后ActivityManagerService通知**應用進程**創建入口Activity的實例,并執行它的生命周期方法
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