Estamos trabalhando no desenvolvimento de serviços para a plataforma Android.

Em nosso serviço, precisamos enviar dados GPS (Lat e Long) do dispositivo para algum serviço REST externo a cada minuto.

Está funcionando bem por quase 15 minutos após o bloqueio do dispositivo. Mas depois disso ele não envia nenhum dado.

Depois de desbloquear o dispositivo, ele inicia novamente o envio de dados pelo serviço REST.

Meu código até agora

public class MainActivity extends AppCompatActivity {

private PendingIntent pendingIntent;
private PowerManager.WakeLock wakeLock;

public static final String USER_NAME = "USERNAME";

String username;
String password;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Intent alarm = new Intent(this, AlarmReceiver.class);
    boolean alarmRunning = (PendingIntent.getBroadcast(this, 0, alarm, PendingIntent.FLAG_NO_CREATE) != null);
    if(alarmRunning == false) {
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarm, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), 30000, pendingIntent);
    }

    PowerManager mgr = (PowerManager)this.getSystemService(Context.POWER_SERVICE);
    wakeLock = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,"MyWakeLock");
    wakeLock.acquire();
 }

public class BackgroundService extends Service  {

private boolean isRunning;
private Context context;
private Thread backgroundThread;

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

@Override
public void onCreate() {
    this.context = this;
    this.isRunning = false;
    this.backgroundThread = new Thread(myTask);
}

private Runnable myTask = new Runnable() {
    public void run() {
        // Do something here
        login("admin","admin");
        stopSelf();
    }
};

@Override
public void onDestroy() {
    this.isRunning = false;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    if(!this.isRunning) {
        this.isRunning = true;
        this.backgroundThread.start();
    }
    return START_STICKY;
}

private void login(final String strLatitude, final String strLongitude) {


    class LoginAsync extends AsyncTask<String, Void, String> {

        String charset = "UTF-8";
        HttpURLConnection conn;
        DataOutputStream wr;
        StringBuilder result = new StringBuilder();
        URL urlObj;
        JSONObject jObj = null;
        StringBuilder sbParams;
        String paramsString;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            // loadingDialog = ProgressDialog.show(MainActivity.this, "Please wait", "Loading...");
        }

        @Override
        protected String doInBackground(String... params) {
            String uname = params[0];
            String pass = params[1];

            sbParams = new StringBuilder();

            try {
                sbParams.append("name").append("=")
                        .append(URLEncoder.encode(uname, charset));
                sbParams.append("&");
                sbParams.append("password").append("=")
                        .append(URLEncoder.encode(pass, charset));
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }

            try {

                String url="http://192.168.0.122:1234/YegoService.svc/AddVehicleMovement";
                URL object=new URL(url);

                HttpURLConnection con = (HttpURLConnection) object.openConnection();
                con.setDoOutput(true);
                con.setDoInput(true);
                con.setRequestProperty("Content-Type", "application/json");
                con.setRequestProperty("Accept", "application/json");
                con.setRequestMethod("POST");

                JSONObject parent = new JSONObject();

                parent.put("strValidatorID","111");
                parent.put("TXT_LAT", "28.25252525");

                parent.put("TXT_LONG", "77.7777777");
                parent.put("DAT_DATE", "");
                con.connect();

                OutputStreamWriter wr = new OutputStreamWriter(con.getOutputStream());
                wr.write(parent.toString());
                wr.flush();
                wr.close();

                InputStream input = con.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(input));
                String line;

                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }

                con.disconnect();

            } catch (IOException e) {
                e.printStackTrace();
            }
            catch (Exception ex) {
                ex.printStackTrace();
            }

            return result.toString();
        }

        @Override
        protected void onPostExecute(String result){
            String s = result.trim();
        }
    }

    LoginAsync la = new LoginAsync();
    la.execute("admin", "admin");

}

}

public class AlarmReceiver extends BroadcastReceiver {
String strLatitude;
String strLongitude;

@Override
public void onReceive(Context context, Intent intent) {
    Intent background = new Intent(context, BackgroundService.class);
    context.startService(background);
}
}

O que fazer?