一、Activity的启动流程
startActivity
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startActivityForResult
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mInstrumentation.execStartActivity
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ActivityManager.getService().startActivity（即调用AMS的一个单例对象的startActivity方法）
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ams.startActivityAsUser
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mActivityStarter.startActivityMayWait
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mActivityStarter.startActivityLocked
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mActivityStarter.startActivityUnchecked
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...
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ActivityThread.main
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attach（绑定应用到AMS，保存ApplicationThread作为ActivityThread在AMS的代理对象）
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ActivityThrea.handleLaunchActivity
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ActivityThread.performLaunchActivity（通过ClassLoader创建Activity实例和Application实例，依次调用Application的attachBaseContext、onCreate、Activity的attach（创建window）、onCreate、onStart）
二、Service的工作过程
1、startService的代码调用流程
startService
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ContextImpl.startService
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ContextImpl.startServiceCommon
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ActivityManager.getService().startService
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mServices.startServiceLocked
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mServices.startServiceInnerLocked
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mServices.bringUpServiceLocked
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mServices.realStartServiceLocked
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app.thread.scheduleCreateService（app.thread即ApplicationThread）
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ActivityThread.handleCreateService（通过ClassLoader创建service实例并执行onCreate方法）
ActivityThread.handleServiceArgs（调用Service的onStartCommand方法）
2、bindService的代码调用流程
bindService
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ContextImpl.bindService
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ContextImpl.bindServiceCommon
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ActivityManager.getService().bindService
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mServices.bindServiceLocked
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mServices.bringUpServiceLocked
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mServices.realStartServiceLocked
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app.thread.scheduleCreateService
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同startService
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mServices.requestServiceBindingLocked
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r.app.thread.scheduleBindService
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ActivityThread.handleBindService（回调onBind方法）
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ActivityManager.getService().publishService
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(AMS)mServices.publishServiceLocked
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c.conn.connected（c.conn的类型是ServiceDispatcher.InnerConnection）
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ServiceDispatcher.connected
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ActivityThread.post(new RunConnection)（RunConnection的run方法调用了ServiceDispatcher的doConnected方法，doConnected方法调用ServiceConnection的onServiceConnected方法）
三、广播的工作过程
1、广播的静态注册
应用安装时由系统自动完成注册，和其它三大组件一样是通过PMS来完成注册过程的
2、广播的动态注册
registerReceiver
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ContextImpl.registerReceiver
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ContextImpl.registerReceiverInternal（IIntentReceiver是对BroadcastReceiver的封装，是一个Binder接口，便于在跨进程中传递）
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ActivityManager.getService().registerReceiver（和Service相似，通过ams完成相应的注册工作）
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mRegisteredReceivers.put(receiver.asBinder(), rl)
BroadcastFilter bf = new BroadcastFilter(filter, rl, callerPackage,permission, callingUid, userId, instantApp, visibleToInstantApps);
rl.add(bf);
最终把InnerReceiver和IntentFilter保存起来，就完成了注册
3、广播的发送和接收
sendBroadcast
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ContextImpl.sendBroadcast
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ActivityManager.getService().broadcastIntent
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(AMS)broadcastIntentLocked
// By default broadcasts do not go to stopped apps.（默认不发送广播给处于停止状态的App）
intent.addFlags(Intent.FLAG_EXCLUDE_STOPPED_PACKAGES);
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//根据intent-filter查找出匹配的广播接受者并经过一系列的条件过滤，最终将满足条件的广播接收器添加进BroadcastQueue中，再通过BroadcastQueue发送广播
BroadcastQueue queue = broadcastQueueForIntent(intent);
BroadcastRecord r = new BroadcastRecord(queue, ...);
queue.scheduleBroadcastsLocked();
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mHandler.sendMessage(mHandler.obtainMessage(BROADCAST_INTENT_MSG, this));
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processNextBroadcast
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deliverToRegisteredReceiverLocked
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performReceiveLocked
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app.thread.scheduleRegisteredReceiver（app.thread指得是ApplicationThread）
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LoaderApk.ReceiverDispatcher.performReceive
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mActivityThread.post(args.getRunnable())
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args.run
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receiver.onReceive(mContext, intent);
4、ContentProvider的工作过程
ContentProvider会在先于Application的onCreate创建并执行其onCreate方法
ActivityThread.main
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thread.attach(false);
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ActivityManager.getService().attachApplication(mAppThread)
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(ApplicationThread)mAppThread.bindApplication
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ActivityThread.handleBindApplication
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installContentProviders
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