Activity 启动过程：
startActivity()-> Instrumentation.execStartActivity()-> Binder->ActivityManagerService-> Zygote fork app -> Binder -> ApplicationThread.scheduleLaunchActivity() - > Handler -> ActivityThread.handleLaunchActivity() -> performLauncherActivity -> Instrumentation create Activity -> 设置 application ,创建 ContextImpl，调用 attatch 方法，调用 Instrumentation 的 callActivityOnCreate-> Activity.onCreate() startActivity()-> Instrumentatio
阅读背景：
Android 启动、绘制、显示过程
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