Service分享

什么是Service?

• 通常意义的Service
• 定义

A Service is an application component representing either an application's desire to perform a longer-running operation while not interacting with the user or to supply functionality for other applications to use.

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为什么用Service?

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应用场景

• 举例

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了解Service

• 创建方式

  • startService
  • bindService

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• 生命周期

  • onCreate
  • onStartCommand

    START_STICKY START_NOT_STICKY START_REDELIVER_INTENT

  • onDestroy
  • onUnbind
  • onRebind
  • onBind

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• 重要方法

  • stopSelf (final)
    • stopSelf(int) 可以让Service处理完已经开始的Intent再停止
  • stopService
  • startForeground
  • stopForeground

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• Notes

  • service 可以是私有的
  • gracefully handle restarts by the system

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代码

private void acceptInterview() {

        Message message = JsonUtils.readModel(this, "sample.json",
                              "accept_message_sample", Message.class);
        //启动service
        startService(new Intent(this, MessageService.class) 
                        .putExtra("message", message));
    }

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    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        if (intent.getExtras() != null) {
            Message message = (Message) intent.getExtras().get("message");
            long id = ServiceFactory.getInstance()
                          .getMessageService().addMessage(message);
        }
        Ln.e("msg service onStartCommand");

        //停止Service
        stopSelf();

        return START_NOT_STICKY;
    }

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有什么问题吗？

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和它们之间的关系

• Activity
• Thread

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IntentService

• 什么要用它,除了它还是其它方法吗?

• 和它们之间的关系

  • Handler
  • AsynTask