Android 服务运行多个

Question

这是我的服务代码：

public class MyCustomService extends Service {
public static final String INPUT_TEXT="INPUT_TEXT";
public static final String OUTPUT_TEXT="OUTPUT_TEXT";
private volatile HandlerThread mHandlerThread;
private ServiceHandler mServiceHandler;
public Socket client;

// ...

// Define how the handler will process messages
private final class ServiceHandler extends Handler {
    public ServiceHandler(Looper looper) {
        super(looper);
    }

    // Define how to handle any incoming messages here
    @Override
    public void handleMessage(Message message) {
        // ...
        // When needed, stop the service with
        // stopSelf();
    }
}

// Fires when a service is first initialized
public void onCreate() {
    super.onCreate();
    // An Android handler thread internally operates on a looper.
    mHandlerThread = new HandlerThread("MyCustomService.HandlerThread");
    mHandlerThread.start();
    // An Android service handler is a handler running on a specific background thread.
    mServiceHandler = new ServiceHandler(mHandlerThread.getLooper());

}


// Fires when a service is started up
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // Send empty message to background thread
    mServiceHandler.sendEmptyMessageDelayed(0, 500);
    // or run code in background
    mServiceHandler.post(new Runnable() {
        @Override
        public void run() {
            // Do something here in background!

            IO.Options opts = new IO.Options();
            opts.query = "auth_token=51";
            try {
                client = IO.socket("http://192.168.0.106:3000/",opts);
                client.on("message", onMessage);
                client.connect();
            } catch (URISyntaxException e) {
                e.printStackTrace();
            }


            // If desired, stop the service
            //stopSelf();
        }
    });
    // Keep service around "sticky"
    return START_STICKY;
}

// ...

// Defines the shutdown sequence
@Override
public void onDestroy() {
    // Cleanup service before destruction
    client.disconnect();
    client.close();
    mHandlerThread.quit();
}

private Emitter.Listener onMessage = new Emitter.Listener() {
    @Override
    public void call(Object... args) {
        String message = (String) args[0];
        Log.d("recive message message message", message);

        /*create new intent to broadcast our processed data to our activity*/
        Intent resultBroadCastIntent = new Intent();
        /*set action here*/
        //resultBroadCastIntent.setAction(TextCapitalizeResultReceiver.ACTION_TEXT_CAPITALIZED);
        resultBroadCastIntent.setAction(Intent.ACTION_SEND);
        /*set intent category as default*/
        // resultBroadCastIntent.addCategory(Intent.CATEGORY_DEFAULT);
        /*add data to intent*/
        resultBroadCastIntent.putExtra(OUTPUT_TEXT, message);
        /*send broadcast */
        sendBroadcast(resultBroadCastIntent);

    }
};


@Override
public IBinder onBind(Intent intent) {
    return null;
}
}

我运行它来自 activity onCreate 中的这段代码：

    Intent i = new Intent(this, MyCustomService.class);

    i.putExtra("foo", "bar");

    startService(i);

我的问题是，每次我进入 main Activity 并且它运行服务两次或 3 或 4 次，所以当我通过套接字接收新消息时，它会收到三到四次相同的消息。

Answer 1

您应该首先检查该服务是否已经运行宁，如果不是则只运行服务。

/**
     * @param serviceClass Class name of Service
     * @return - boolean indicating running status of Service
     */
    public static boolean isServiceRunning(Context context, Class<?> serviceClass) {
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
            if (serviceClass.getName().equals(service.service.getClassName())) {
                return true;
            }
        }
        return false;
    }

此外，如果您将消息保存在数据库中，您应该检查消息 ID，以免重复的消息堆积在那里。在很多情况下，套接字在连接后会尝试向您发送已收到的消息。

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