緯度不準確，但龍是準確的 - Android設備

Question

我試圖讓我的LatLong從Android設備與GPS。

有我的代碼：

LocationManager lm,locationManager; 
    Location l; 
    TextView lt, ln; 
    lm=(LocationManager)this.getSystemService(Context.LOCATION_SERVICE); 
     lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this); 
     l=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
     updateWithNewLocation(l); 

     private void updateWithNewLocation(Location location) { 
       String latLongString = "Unknown"; 
       String addressString = "No address found"; 
       DecimalFormat df = new DecimalFormat("##.00"); 
       if (location != null) { 
        double lat = location.getLatitude(); 
        double lng = location.getLongitude(); 
        latLongString = "Lat:" + df.format(lat) + "\nLong:" + df.format(lng); 
        Geocoder gc = new Geocoder(MainActivity.this, Locale.getDefault()); 
        try { 
         List<Address> addresses = gc.getFromLocation(lat, lng, 1); 
         if (addresses.size() == 1) { 
          addressString=""; 
          Address address = addresses.get(0); 
          addressString = addressString + address.getAddressLine(0) + "\n"; 
          for (int i = 0; i < address.getMaxAddressLineIndex(); i++){ 
           addressString = addressString + address.getAddressLine(i) + "\n"; 
          } 
          addressString = addressString + address.getLocality()+ "\n"; 
          addressString = addressString + address.getPostalCode()+ "\n"; 
          addressString = addressString + address.getCountryName()+ "\n"; 
         } 
        } catch (IOException ioe) { 
         Log.e("Geocoder IOException exception: ", ioe.getMessage()); 
        } 
       } 
       accurity.setText("Your Current Position is:\n" + latLongString + "\n" + addressString); 
       ln.setText(""+lng); 
       lt.setText(""+lat); 
      } 

} 

我送我的緯度，經度，以C＃代碼映射（動態數據顯示），並在地圖上繪製點。 緯度是錯誤的代碼（它接近我的位置，但不準確 雖然 from addressString我得到了準確的我的地址的建設和城市和國家 從gps和緯度得到的地址長得到從GPS，爲什麼它準確嗎？

addresses = gc.getFromLocation(lat, lng, 1); 

林repit，只有LAT是錯誤的，長的是完美的。 我會如此心存感激的人會發現這個答案是非常重要的謝謝

Answer 1

lm.getlastlocation並不總是給出精確更新的lat long。您需要在requestlocationupdate（locationrequest，location_listener）中使用位置請求對象，並使用提供位置偵聽器的lat long來提供準確的結果。共享代碼如下：

private LocationRequest mlocationrequest; 


// location listener 
LocationListener loc_listener = new LocationListener() 
{ 

    @Override 
    public void onLocationChanged(Location arg0) 
    { 

     if (arg0 != null) 
     { 
      lat = arg0.getLatitude(); 
      lng = arg0.getLongitude(); 
      tm = arg0.getTime(); 
     } 

    } 
}; 

而在你的上創建方法

mlocationrequest = LocationRequest.create(); 
    mlocationrequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); 
    mlocationrequest.setFastestInterval(1000); 
    mlocationrequest.setInterval(10000); 

然後簡單的通過

mlocationclient.requestLocationUpdates(mlocationrequest, loc_listener);