Instrumentation->execStartActivity

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AMS

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IApplicationThread  这个接口里面包含了启动Activity，销毁Activity，启动Service，销毁Service等方法，ApplicationThread继承自IApplicationThrad

ApplicationThread  scheduleLaunchActivity->给一个叫做H的Handler发送一条消息->H会调用到ActivityThread的performLauchActivity

ActivityThread      performLauchActivity->handleonCreate->handleonResume->......依次调用Activity的生命周期