一段时间后android后台服务停止

Question

I have created a background service which is hitting my server on a regular interval but unfortunately, the background service stops after some time.

public class LocationService extends Service{

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

    //TODO do something useful

        new DownloadFilesTask().execute("");
        Toast.makeText(getApplicationContext(), "start", Toast.LENGTH_SHORT).show();

  return START_STICKY;
}


private class DownloadFilesTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... params) {

    try {
        URL url = new URL(siteurl);
        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        try {
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
            StringBuilder stringBuilder = new StringBuilder();
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                stringBuilder.append(line).append("\n");
            }
            bufferedReader.close();
            return stringBuilder.toString();

        }
        finally{
            urlConnection.disconnect();
        }
    }
    catch(Exception e) {
        Log.e("ERROR", e.getMessage(), e);
       return null;
    }

    }

    @Override
    protected void onPostExecute(String result) {
    }

    @Override
    protected void onPreExecute() {
    }

    @Override
    protected void onProgressUpdate(Void... values) {
    }
}

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

@Override
public void onDestroy() {
    super.onDestroy();

   Intent myIntent = new Intent(getApplicationContext(), LocationService.class);

PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, myIntent, 0);

AlarmManager alarmManager1 = (AlarmManager) getSystemService(ALARM_SERVICE);


alarmManager1.cancel(pendingIntent);
Calendar calendar = Calendar.getInstance();

calendar.setTimeInMillis(System.currentTimeMillis());

calendar.add(Calendar.SECOND, 10);

alarmManager1.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
alarmManager1.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_FIFTEEN_MINUTES, pendingIntent);

}
@Override
public void onTaskRemoved(Intent rootIntent) {
    super.onTaskRemoved(rootIntent);

    Intent myIntent = new Intent(getApplicationContext(), LocationService.class);

PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 0, myIntent, 0);

AlarmManager alarmManager1 = (AlarmManager) getSystemService(ALARM_SERVICE);


alarmManager1.cancel(pendingIntent);
Calendar calendar = Calendar.getInstance();

calendar.setTimeInMillis(System.currentTimeMillis());

calendar.add(Calendar.SECOND, 10);

alarmManager1.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
alarmManager1.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_FIFTEEN_MINUTES, pendingIntent);


}

}

Answer 1

With the latest release of Android API level 26, there is limit put on background services. Please refer Background execution limits

Answer 2

onStartCommand will revoke automatically only if startService is called once from anywhere of your code. So declaring service only in Manifest would not enough.

So, run service by calling

startService(new Intent(context, serviceName.class));

Following above codes onStartCommand method will be revoked periodically if service is not stopped.

For your information, removing app from recent closes service. And

@Override
public void onTaskRemoved(Intent rootIntent) {

}

method is being called.

If you start service manually it will start again automatically even is being closed.