得到位置的代碼片段，不想考慮網絡位置

Question

我是Android的新手，我從獲取位置的計算器中獲取了一個代碼片段。它工作的很完美，但是當網絡互聯網被激活時，它會從那裏獲得座標，而且它們不是很準確，或者根本就沒有（有時會出現5km +錯誤）。

我想讓我的位置代碼獲取片段以獲取僅GPS位置，但我目前的知識不允許我修改它，以便我可以獲取該位置。

這裏是代碼片段：

package com.fourbox.bocterapp; 

/** 
* Created by Soulstorm on 10/14/2014. 
*/ 
import java.util.Timer; 
import java.util.TimerTask; 
import android.content.Context; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 

public class MyLocation { 
    Timer timer1; 
    LocationManager lm; 
    LocationResult locationResult; 
    boolean gps_enabled=false; 
    boolean network_enabled=false; 

    public boolean getLocation(Context context, LocationResult result) 
    { 
     //I use LocationResult callback class to pass location value from MyLocation to user code. 
     locationResult=result; 
     if(lm==null) 
      lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE); 

     //exceptions will be thrown if provider is not permitted. 
     try{gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){} 
     try{network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){} 

     //don't start listeners if no provider is enabled 
     if(!gps_enabled && !network_enabled) 
      return false; 

     if(gps_enabled) 
      lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps); 
     if(network_enabled) 
      lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,  locationListenerNetwork); 
     timer1=new Timer(); 
     timer1.schedule(new GetLastLocation(), 50000); 
     return true; 
    } 

    LocationListener locationListenerGps = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      timer1.cancel(); 
      locationResult.gotLocation(location); 
      lm.removeUpdates(this); 
      lm.removeUpdates(locationListenerNetwork); 
     } 
     public void onProviderDisabled(String provider) {} 
     public void onProviderEnabled(String provider) {} 
     public void onStatusChanged(String provider, int status, Bundle extras) {} 
    }; 

    LocationListener locationListenerNetwork = new LocationListener() { 
     public void onLocationChanged(Location location) { 
      timer1.cancel(); 
      locationResult.gotLocation(location); 
      lm.removeUpdates(this); 
      lm.removeUpdates(locationListenerGps); 
     } 
     public void onProviderDisabled(String provider) {} 
     public void onProviderEnabled(String provider) {} 
     public void onStatusChanged(String provider, int status, Bundle extras) {} 
    }; 

    class GetLastLocation extends TimerTask { 
     @Override 
     public void run() { 
      lm.removeUpdates(locationListenerGps); 
      lm.removeUpdates(locationListenerNetwork); 
      Location net_loc=null, gps_loc=null; 
      if(gps_enabled) 
       gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
      if(network_enabled) 
       net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 

      //if there are both values use the latest one 
      if(gps_loc!=null && net_loc!=null){ 
       if(gps_loc.getTime()>net_loc.getTime()) 
        locationResult.gotLocation(gps_loc); 
       else 
        locationResult.gotLocation(net_loc); 
       return; 
      } 

      if(gps_loc!=null){ 
       locationResult.gotLocation(gps_loc); 
       return; 
      } 
      if(net_loc!=null){ 
       locationResult.gotLocation(net_loc); 
       return; 
      } 
      locationResult.gotLocation(null); 
     } 
    } 

    public static abstract class LocationResult{ 
     public abstract void gotLocation(Location location); 

    } 
} 

這是我如何使用它：

MyLocation.LocationResult locationResult = new MyLocation.LocationResult() { 
         @Override 
         public void gotLocation(Location location) { 
          currentUserLatitude = location.getLatitude(); 
          currentUserLongitude = location.getLongitude(); 
          new RemoteDataTask().execute(); 
         } 
        }; 
        MyLocation myLocation = new MyLocation(); 
        myLocation.getLocation(this, locationResult); 

能否請你幫我修改我的代碼，所以我的片斷沒有得到網絡座標，只有GPS的？

在此先感謝！ 尊重。

Answer 1

GetLastLocation類中的以下兩行是您通過網絡位置提供程序訂閱位置更新的位置。

只需刪除這兩行代碼即可不再接收來自網絡位置提供程序的更新。

if(network_enabled) 
     lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,  locationListenerNetwork); 

請注意，GPS位置更新可能比網絡更長。所以如果速度是一個問題，另一種方法是仍然使用網絡位置更新，但是要對準確度值進行過濾。這看起來像這樣：

LocationListener locationListenerNetwork = new LocationListener() { 
    public void onLocationChanged(Location location) { 

     if (location.getAccuracy() > THRESHOLD) { 
      return; 
     } 

     timer1.cancel(); 
     locationResult.gotLocation(location); 
     lm.removeUpdates(this); 
     lm.removeUpdates(locationListenerGps); 
    } 
    public void onProviderDisabled(String provider) {} 
    public void onProviderEnabled(String provider) {} 
    public void onStatusChanged(String provider, int status, Bundle extras) {} 
};