LocationListener 没有调用 onLocationChanged

Question

public class LocationService extends Service{

    private LocationManager locationMangaer=null;
    private LocationListener locationListener=null; 



    private static final String TAG = "Debug";
    private Boolean flag = false;
    public static String cityName=null;
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }


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


        Log.d("Location Serive","Started");
        locationMangaer = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        locationListener = new MyLocationListener();

        flag = displayGpsStatus();
        boolean c=isOnline();
        if(flag)
        {
            locationMangaer.removeUpdates(locationListener);
            Criteria crit2 = new Criteria();
            crit2.setAccuracy(Criteria.ACCURACY_FINE);
            String provider2 = locationMangaer.getBestProvider(crit2, false);
            Toast.makeText(getApplicationContext(), provider2, Toast.LENGTH_LONG).show();
            locationMangaer.requestLocationUpdates(provider2,1, 1,locationListener);

        }
        else if(c)
        {
            locationMangaer.removeUpdates(locationListener);
            Criteria crit = new Criteria();
            crit.setPowerRequirement(Criteria.POWER_LOW);
            crit.setAccuracy(Criteria.ACCURACY_COARSE);
            String provider = locationMangaer.getBestProvider(crit, false); 
            Toast.makeText(getApplicationContext(), provider, Toast.LENGTH_LONG).show();
            locationMangaer.requestLocationUpdates(provider,1, 1,locationListener);

        }
        else
        {
            //Nothing Available
        }
        Log.d("Internet",Boolean.toString(c));

    }




    /*net Enabled or Not*/
    public boolean isOnline() {
        ConnectivityManager cm =
            (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netInfo = cm.getActiveNetworkInfo();
        return netInfo != null && netInfo.isConnectedOrConnecting();
    }
    /*----------Method to Check GPS is enable or disable ------------- */
    @SuppressWarnings("deprecation")
    private Boolean displayGpsStatus() {
        ContentResolver contentResolver = getBaseContext().getContentResolver();
        boolean gpsStatus = Settings.Secure.isLocationProviderEnabled(contentResolver, LocationManager.GPS_PROVIDER);

        if (gpsStatus) {
            return true;

        } else {
            return false;
        }
    }



    /*----------Listener class to get coordinates ------------- */
    private class MyLocationListener implements LocationListener {

        @Override
        public void onLocationChanged(Location loc) {
          Log.d("Location Changed", "location:");
        Log.d("Latitude", Double.toString(loc.getLatitude()));
        Log.d("Longitude",Double.toString(loc.getLongitude()));
        Toast.makeText(getApplicationContext(), Double.toString(loc.getLatitude()), Toast.LENGTH_LONG).show();
        double p=loc.getLongitude();
        double q=loc.getLatitude();

        LocationChecker(p,q);


        }

            @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub

        }




    }

从这个 Activtiy 我调用了服务 但是，一旦通过滑动从最近的应用程序中删除我的应用程序，位置监听器就会停止工作并且不会显示任何位置更改更新，但如果应用程序正在运行，那么它就可以正常工作。

 public class Dashboard extends ActionBarActivity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_dashboard);
                Intent l = new Intent(getApplicationContext(),LocationService.class);
                    getApplicationContext().startService(l);
    }

Answer 1

您是否在活动的 onDestroy 中停止服务？

您还可以覆盖方法 onStartCommand 并使用 START_STICKY 值。

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i(TAG, "Received start id " + startId + ": " + intent);
        // We want this service to continue running until it is explicitly
        // stopped, so return sticky.
        return START_STICKY;
    }

更新1

您可以在单独的进程中启动您的服务。见文档： http://developer.android.com/guide/topics/manifest/service-element.html#proc

如果进程名称以小写字符开头，则服务 将在该名称的全局进程中运行，前提是它具有 允许这样做。

例如：

    <service
        android:name=".LocationService"
        android:process="myLocationService" [...] >
        [...]
    </service>