GrabLocationDetails.java

Question

我希望我的应用程序在后台运行我有一个应用程序将用户的位置发送到我们的服务器
我有以下代码：

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    LocationManager locationManager;
    String context = Context.LOCATION_SERVICE;
    locationManager = (LocationManager)getSystemService(context);

    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    criteria.setAltitudeRequired(false);
    criteria.setBearingRequired(false);
    criteria.setCostAllowed(true);
    criteria.setPowerRequirement(Criteria.POWER_LOW);
    String provider = locationManager.getBestProvider(criteria, true);

    updateWithNewLocation(null);

    locationManager.requestLocationUpdates(provider, (10*60*1000), 10,
                                           locationListener);
}
private final LocationListener locationListener = new LocationListener() {
    public void onLocationChanged(Location location) {
      updateWithNewLocation(location);
    }

    public void onProviderDisabled(String provider){
      updateWithNewLocation(null);
    }

    public void onProviderEnabled(String provider){ }
    public void onStatusChanged(String provider, int status, 
                                Bundle extras){ }
  };
  public void updateWithNewLocation(Location location) {


        if (location != null) {
            Dbhelper helper = new Dbhelper(this);
            final SQLiteDatabase db = helper.getWritableDatabase();
            long time = System.currentTimeMillis();
            SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss");
            final String curTime = df.format(time);
            final double lat = location.getLatitude();
            final double lng = location.getLongitude();
            final double alt = location.getAltitude();
            System.out.println(lat);
            System.out.println(lng);
            System.out.println(alt);
            db.execSQL("INSERT INTO location (longitude,latitude,altitude,tgl_buat) VALUES " +
            "('"+lng+"','"+lat+"','"+alt+"','"+curTime+"')");
            db.close();
            /*Timer timer = new Timer();
            timer.scheduleAtFixedRate(new TimerTask(){
                @Override
                public void run(){
                    db.execSQL("INSERT INTO location (longitude,latitude,altitude,tgl_buat) VALUES " +
                            "('121.2149012','-6.217837','0.0','2012-05-07 10:20:01')");
                    db.close();
                }
            }, 10*60*1000, 10*60*1000);*/

          } 
       }

我希望我的应用程序在后台运行。我希望它在手机开机时自动启动

Answer 1

您的问题的一个非常简单的答案是使用Service。它允许您在后台执行各种任务，并且是以静默方式将您的位置发送到服务器的最佳选择。

阅读this答案以寻求帮助。

Answer 2

在Service中运行您的后台逻辑，如果您希望提供良好的用户体验（并且也具有更高的优先级），请将Notification发布到状态栏（使用{{1 }}）。

Answer 3

您可以使用Service

在后台运行应用程序

我希望link可以帮助你

请阅读documentation了解更多详情

Answer 4

您应该使用Service和BroadcastReceiver

Answer 5

GrabLocationDetails.java

将此代码用作GrabLocationDetails.java

 public class GrabLocationDetails extends Service implements LocationListener {

        double lat,lng;
        private LocationManager locationManager;
        private String provider;
        boolean isGps;
        private ArrayList<String> mList;
        Context GLDContext;

        public GrabLocationDetails(Context cont){
            this.GLDContext=cont;
        }
        public GrabLocationDetails(){}
        @Override
        public void onCreate() {
            super.onCreate();
            mList = new ArrayList<String>();
            isGps = false;
            lat=0.0;
            lng=0.0;
        }

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

            //super.onStart(intent, startId);

            try {
                locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
                Criteria criteria = new Criteria();
                provider = locationManager.getBestProvider(criteria, false);
                LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
                boolean enabled = service.isProviderEnabled(LocationManager.GPS_PROVIDER);
                if (!enabled) {
                    isGps = false;
                    ListAddItem(isGps);
                    SendBroadcast();
                } else {
                    isGps = true;
                    Location location = locationManager.getLastKnownLocation(provider);
                    lat=(location.getLatitude());
                    lng=(location.getLongitude());
                    ListAddItem(true);
                    SendBroadcast();
                    locationManager.requestLocationUpdates(provider, 400, 1, this);
                }

            } catch (Exception e) {
                ListAddItem(isGps);
                SendBroadcast();
            }
            return super.onStartCommand(intent, flags, startId);
        }

        @Override
        public void onDestroy() {
            super.onDestroy();
            //locationManager.removeUpdates(this);
        }

        public  void SendBroadcast(){
            Intent broadcastIntent = new Intent();
            broadcastIntent.setAction(CommandExecutionModule.LocationDetails);
            broadcastIntent.putExtra("Data", mList);
            sendBroadcast(broadcastIntent);

        }
        public void ListAddItem(boolean GPS) {
            //if(!GPS)
            //mList.add("0");
            //else
            //mList.add("1");
            mList.add(Double.toString(lat));
            mList.add(Double.toString(lng));
        }

        /**************************************************************************************************************/

        @Override
        public void onLocationChanged(Location location){
            locationManager.requestLocationUpdates(provider, 400, 1, this);
            mList.clear();
            lat = (location.getLatitude());
            lng = (location.getLongitude());
            ListAddItem(isGps);
            SendBroadcast();
            locationManager.removeUpdates(this);
            stopSelf();
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            locationManager.requestLocationUpdates(provider, 400, 1, this);
        }

        @Override
        public void onProviderEnabled(String provider){
            isGps=true;
        }
        @Override
        public void onProviderDisabled(String provider){
            isGps=false;
            lat=0.0;
            lng=0.0;
            mList.clear();
            ListAddItem(isGps);
            //SendBroadcast();
        }

让应用程序在后台运行

5 个答案:

GrabLocationDetails.java