1.Activity

? ?startActivity(Intent)/startActivityForResult(Intent)：來啟動一個Activity

2.Service

? ?startService(Intent)/bindService(Intent)：來啟動一個Service

3.BroadcastReceiver

? ?sendBroadcast：發(fā)送廣播到指定BroadcastReceiver

4.ContentProvider

5.Intent

? ?是四大組件間的樞紐，Android通信的橋梁

6.Fragment