下图描述了在source application中broadcast一个intent,注册此intent的Target Application如何启动和接收的流程。

The picture above is the flow chart for how the source Application broadcast an intent
(1) Inform AMS to broadcast the intent, in blue;
(2) AMS searched all registered receivers with the target intent, start the target application 
process once not yet created, also create the Activity Thread, in Aubergine;;
(3) Invoke the onReceive() callback, in red;

Android 四大组件 之 Broadcast/Receiver 流程