高级进阶必会之服务

Service小结

• 按种类
  Local
  Remote
• 类型
  前台（Notification)
  后台
• 启动方式
  Start
  bind
• Service与Thread与Process
• Service的生命周期
  onCreate
  onStart
  onBind
  onDestory等

AndroidMainfest.xml中的Service

• android:name
• android:label
• android:icon
• android:permission
• android:process
• android:enabled
• android:exported

Service的一些补充知识点

• Service>

• 远程服务
  Messenger
  public class MessengerActivity extends Activity {
  private Messenger mMessenger;
  private ServiceConnection mServiceConnection = new ServiceConnection() {
  // 当与service的连接建立后被调用
  @Override
  public void onServiceConnected(ComponentName name, IBinder service) {
  mMessenger = new Messenger(service);
  }
  @Override
  public void onServiceDisconnected(ComponentName name) {
  }
  };
  @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  bindService(new Intent(this, MessengerService.class),mServiceConnection, Context.BIND_AUTO_CREATE);
  if(mMessenger != null){
  Message message = Message.obtain(null, 0, "hello");//发送Message
  try {
  mMessenger.send(message);
  } catch (RemoteException e) {
  e.printStackTrace();
  }
  }
  }}
  服务端（接收Message)

    public class MessengerService extends Service { 
       // 适合于多进程，单线程。。不需要考虑线程安全
        Messenger mMessenger = new Messenger(new IncomingHandler());
        class IncomingHandler extends Handler{
            @Override
            public void handleMessage(Message msg) { 
               super.handleMessage(msg);             // 处理消息
                switch (msg.what){
                    case 0:                    
    // fdsfdskfdlsj;
                        break;
                } 
           } 
       }
        @Nullable
        @Override
        public IBinder onBind(Intent intent) {
            return mMessenger.getBinder();
        }}