如何在服務第一時間獲取正確的位置？

Question

我有一個服務中獲得的android手機的當前位置爲：

LocationManager locationManager; 
private static int LOCATION_INTERVAL = 0; 
private static float LOCATION_DISTANCE = 0; 
Location mLastLocation; 
Location preLocal; 

@Override 
public void onLocationChanged(Location location) { 
    // TODO Auto-generated method stub 
    mLastLocation = location; 
} 


@Override 
public void onCreate() { 
    // TODO Auto-generated method stub 
    // super.onCreate(); 
    if (locationManager == null) { 
     locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE); 
    } 
    boolean gps_enabled = false, network_enabled = false; 
    // SharedPreferences sh = getSharedPreferences("appShareLoc", 
    // MODE_PRIVATE); 
    // LOCATION_INTERVAL = sh.getInt("LocTime", 1); 
    // LOCATION_DISTANCE = sh.getInt("LocDistance", 10); 
    try { 
     gps_enabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER); 
    } catch (Exception ex) { 
    } 
    try { 
     network_enabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER); 
    } catch (Exception ex) { 
    } 
    if (gps_enabled) { 
     locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE, 
       this); 
    } 
    if (network_enabled) { 
     locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, 
       LOCATION_DISTANCE, this); 
    } 
} 

@Override 
public void onDestroy() { 
    // TODO Auto-generated method stub 
    super.onDestroy(); 
    if (locationManager != null) 
     locationManager.removeUpdates(this); 
} 

@Override 
    public void onStart(Intent intent, int startId) { 
     try { 
      Thread.sleep(5000); 
     } catch (InterruptedException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

       if (mLastLocation == null) { 
       boolean gps_enabled = false, network_enabled = false; 
       ty { 
        network_enabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER); 
        if (network_enabled) { 
         mLastLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 
        } 
       } catch (Exception ex) { 
       } 

       if (mLastLocation == null) { 
        try { 
         gps_enabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER); 
         if (gps_enabled) { 
          locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, 
            LOCATION_DISTANCE, this); 
          mLastLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); 

         } 
        } catch (Exception ex) { 
        } 
       } 

      } 
      if (mLastLocation != null) { 

//process location 
      } 
stopSelf(); 
} 

我只有1米高，但服務回報1個新位置距離前面的位置更改手機66米。 服務第一次如何獲取正確的位置？

Answer 1

實施 「OnMapReadyCallback」 和 試試這個

@Override 
public void onMapReady(final GoogleMap googleMap) { 

    LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); 
    if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { 
     startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)); 
     G.customToast("Please Turn On GPS ..."); 
     //when gps turn on , your point in map automatically send to LocationListener . 
    } 


    LocationListener locationListener = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      // Log.i("maysam", " lat " + location.getLatitude() + " lon " + location.getLongitude()); 
      lat = location.getLatitude(); 
      lon = location.getLongitude(); 

      mMap = googleMap; 
      LatLng sydney = new LatLng(lat, lon); 
      mMap.addMarker(new MarkerOptions().position(sydney).title("مختصات شما")); 
      mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney)); 
      mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), 12.0f)); 

      Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault()); 
      List<Address> addresses; 
      try { 
       addresses = gcd.getFromLocation(location.getLatitude(), location 
         .getLongitude(), 1); 
       if (addresses.size() > 0) { 
        String StreetName = addresses.get(0).getThoroughfare(); 
        txtCityName.setText(StreetName); 
       } 


      } catch (Exception e) { 
      } 

     } 

     public void onStatusChanged(String provider, int status, Bundle extras) { 
     } 

     public void onProviderEnabled(String provider) { 
     } 

     public void onProviderDisabled(String provider) { 
     } 
    }; 
    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
     return; 
    } 
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener); 
}