About Android 5 Service

启动和生命周期

• 启动方式
  • startService
    • 无限期运行
    • 生命周期
      • onCreate
      • onStartCommand
      • onDestory

  • bindService

    • onCreate
    • onBind
    • onUnbind
    • onDestory
• 手动调用
  • startService
    • 单次
      • onCreate
      • onStartCommand
    • 多次
      • onCreate
      • onStartCommand
      • onStartCommand
  • stopService
    • onDestory
  • bindService
    • onCreate
    • onBind
  • unbindService
    • onUnbind
    • onDestory
• 解绑绑定Service服务
  • unbindService() —> onUnbind(ture) —> bindService() —> onRebind()

Service 与 Thread

无相关，只是有点像。
Service运行与主线程，只要进程不消失则继续运行
Thread运行在其他线程，

IntentService

在IntentService的Oncreate中，开启一个新的线程，并绑定一个handler

@Override
public void onCreate() {
  super.onCreate()

  HandlerThread thread = new Handler("IntenteService["+ mName+"]")
  thread.start()

  mServiceLooper = thread.getLooper()

  mServiceHandler = new ServiceHandler(mServiceLooper);
}

public int onStartCommand(Intent intent, int flags, int startId) {
  onStart(intent,startId);
  return mRedelivery ? START_REDELIVER_INTENT : START_NOT_STICKY;
}

public void onStart(Intent intent, int startId) {
  Message msg = mServiceHandler.obtainMessage();
  msg.arg1 = startId;

  msg.obj = intent;

  mServiceHandler.sendMessage(msg)
}

ServiceHandler的源码

private final class ServiceHandler extends Handler {
  public ServiceHandler(Looper looper) {
    super(looper)
  }

  @Override
  public void handleMessage(Message msg) {
    onHandleIntent((Intent) msg.obj);
    stopSelf(msg.arg1);
  }
}

Service 与Activity通信

• onbind返回Ibinder对象
• unbindService和bindService的时候参入ServiceConnection对象

Remote Service IPC

• IPC
• AIDL

参考
1
2
3