send data to server in background on every x sec or minutes

I need to send data to server continuously (say after every x seconds or min) even if app is in background.i know service is the best option for this.as i have never tried such scenario is there any handy example on how to make web-service call from service and then after deliver response to activity (whether data successfully or not).any approach or other way on how to achieve this. any help is appreciated.

First add this in mainactivity:

AlarmManager alarmManager;
PendingIntent pendingIntent;
Calendar calendar;
Intent alarm;
final int SDK_INT = Build.VERSION.SDK_INT;

    calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());

alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarm = new Intent(this, TestForecastService.class);
pendingIntent = PendingIntent.getService(this, 0, alarm, 0);

if (SDK_INT < Build.VERSION_CODES.KITKAT) {
    alarmManager.set(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000, pendingIntent);
    Log.d("lowerMF","hahah");
}
else if (Build.VERSION_CODES.KITKAT <= SDK_INT  && SDK_INT < Build.VERSION_CODES.M) {
    alarmManager.setExact(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000,pendingIntent);
    Log.d("kitkatMF","hahah");
}
else if (SDK_INT >= Build.VERSION_CODES.M) {
    alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000,pendingIntent);
    Log.d("marshmallowMF","hahah");
}

Now, TestForecastService: in which you can define your work:

public class TestForecastService extends IntentService {

    Context context;
    PowerManager powerManager;
    PowerManager.WakeLock wakeLock;
    final int SDK_INT = Build.VERSION.SDK_INT;
    AlarmManager alarmManager;
    PendingIntent pendingIntent;
    Intent alarm;

    public TestForecastService() {
        super("");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        powerManager = (PowerManager) getSystemService(POWER_SERVICE);
        wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "FCFCFCFC");

        wakeLock.acquire();
        sendDATA(city);

    }

    private void sendDATA(String city) {
        try {

           ......DO YOUR DATA SENDING WORK.........

        } catch (Exception e) {
            Log.v("fserviceerror","erre");
        }

        reSETALARAM();
        wakeLock.release();
    }

    private void reSETALARAM() {
        alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
        alarm = new Intent(this,TestForecastService.class);
        pendingIntent = PendingIntent.getService(this, 0, alarm, 0);

        if (SDK_INT < Build.VERSION_CODES.KITKAT) {
            alarmManager.set(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000, pendingIntent);
            Log.d("lowerFS","hahah");
        }
        else if (Build.VERSION_CODES.KITKAT <= SDK_INT  && SDK_INT < Build.VERSION_CODES.M) {
            alarmManager.setExact(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000,pendingIntent);
            Log.d("kitkatFS","hahah");
        }
        else if (SDK_INT >= Build.VERSION_CODES.M) {
            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000,pendingIntent);
            Log.d("marshmallowFS","hahah");
        }
    }

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

Now, make BrodcastReceiver class that run your service when device restarted:

public class Auto extends BroadcastReceiver {

        final int SDK_INT = Build.VERSION.SDK_INT;

        @Override
        public void onReceive(Context ctx, Intent intent) {

                if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")){
                        AlarmManager alarmMgr = (AlarmManager) ctx.getSystemService(Context.ALARM_SERVICE);
                        Intent intent1 = new Intent(ctx, TestForecastService.class);
                        PendingIntent alarmIntent = PendingIntent.getService(ctx, 0, intent1, 0);

                        if (SDK_INT < Build.VERSION_CODES.KITKAT) {
                                alarmMgr.set(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000, alarmIntent);
                                Log.d("lowerFB","hahah");
                        }
                        else if (Build.VERSION_CODES.KITKAT <= SDK_INT  && SDK_INT < Build.VERSION_CODES.M) {
                                alarmMgr.setExact(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000,alarmIntent);
                                Log.d("kitkatFB","hahah");
                        }
                        else if (SDK_INT >= Build.VERSION_CODES.M) {
                                alarmMgr.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,System.currentTimeMillis()+10000,alarmIntent);
                                Log.d("marshmallowFB","hahah");
                        }
                }
        }
    }

Finally, add this in Manifest file:

    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
    <uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
    <uses-permission android:name="android.permission.WAKE_LOCK"/>

<service android:name=".TestForecastService" android:exported="true" android:enabled="true"/>
<receiver android:name=".Auto" android:exported="true" android:enabled="true" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
            </intent-filter>
        </receiver>