服务始终在后台

Question

我确实创建了一个 Android 应用程序来每十五秒发送一次短信。我确实创建了一项服务，它永远不会结束，因为我需要向我的客户发送警报并且丢失消息很重要。服务代码如下：

public class AppService extends Service {
private static final long _updateIntervar = 15000;
private static final long _initialInterval = 100;
private static Timer timer = new Timer();
private PowerManager.WakeLock mWakeLock = null;

public AppService() {}

@Override
public void onCreate() {
    super.onCreate();
    PowerManager manager = (PowerManager) getSystemService(Context.POWER_SERVICE);
    mWakeLock = manager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, AppService.class.getName());
    this.runingAppService();
}

@Override
public void onDestroy() {
    super.onDestroy();
    mWakeLock.release();
    stopForeground(true);
}

public void runingAppService() {
    try {
        TimerTask task = new TimerTask() {
            @Override
            public void run() {
                sendMessages();
            }
        };
        timer.schedule(task, _initialInterval, _updateIntervar);
    } catch (Exception e) {
        Common.showToast(e.getMessage(), Common._shortPeriodToast);
    }
}

private void sendMessages() {
    if (InternalData.getStatusLogin() && InternalData.getStatusService()) {
        Map<String, String> data = new HashMap<String, String>();
        data.put("OPTION", "GET_MESSAGES");
        data.put("DISTRIBUTOR", String.valueOf(InternalData.getIdDistribuidor()));
        data.put("SMS_GATEWAY", String.valueOf(InternalData.getIdGateWay()));
        HttpServerRequest.getDataMessages(data);
        HttpServerRequest.setMessageReceived(SMS.readInboxSMS());
        System.gc();
    }
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    super.onStartCommand(intent, flags, startId);
    startForeground(Process.myPid(), new Notification());
    mWakeLock.acquire();
    return START_REDELIVER_INTENT;
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    //throw new UnsupportedOperationException("Null");
    return null;
}}

我在我的服务上使用 TimerTask 来调用方法 sendMessages () 并且确实如此，但是在五次或更少之后我的服务停止了。如果有人认为我做错了，我将非常感谢他们。

Answer 1

尝试从 onStartCommand 方法 return START_STICKY:

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    super.onStartCommand(intent, flags, startId);
    startForeground(Process.myPid(), new Notification());
    mWakeLock.acquire();
    return START_STICKY;

}

START_STICKY 用于根据需要显式启动和停止的服务： https://developer.android.com/reference/android/app/Service.html#START_STICKY

服务始终在后台

Service always in background

service

android

background

timertask