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
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