プロバイダが利用できない場合は、「未知」またはnullを返す

Question

私はthis script by Fedorを使用していますが、少し違いがあります：GPSとネットワークプロバイダの両方が利用できない場合、nullまたは "unknown"文字列。私は、スクリプトを変更し、私は実行すると、それが閉じを強制、logcatは言う：

MyLocation.java

package com.example.GetALocation2; 
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(), 20000); 

     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); 
    } 
} 

：

私は以下のコードを持っていますGetALocation2.java

package com.example.GetALocation2; 

import com.example.GetALocation2.MyLocation.LocationResult; 

import android.app.Activity; 
import android.location.Location; 
import android.os.Bundle; 
import android.widget.TextView; 
import android.widget.Toast; 

public class GetALocation2 extends Activity { 

    Double latitude; 
    TextView tv; 
    MyLocation myLocation = new MyLocation(); 


    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     Toast.makeText(getBaseContext(), "This is the start!", Toast.LENGTH_SHORT).show(); 
     locationClick(); 
    } 


    private void locationClick() { 
     myLocation.getLocation(this, locationResult); 
    } 

    public LocationResult locationResult = new LocationResult(){ 
     @Override 
     public void gotLocation(final Location location){ 
      //Got the location! 

       if(location == null){ 
        Toast.makeText(getBaseContext(), "Location is unknown.", Toast.LENGTH_SHORT).show(); 
       }else{ 
        GetALocation2.this.latitude = location.getLatitude(); 
        Toast.makeText(getBaseContext(), "I got the location! >>> " + location.getLatitude(), Toast.LENGTH_SHORT).show(); 
       } 
      }; 
    }; 

} 

私はJavaとAndroidにちょっと新しく、何か助けてくれてありがとう！ :)

Answer 1

・ホープ、このことができます：

private LocationManager lm; 
private LocationListener ll; 
public static String latitude; 
public static String longitude; 
double lat,lon; 


    lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 

     if(lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){ 
//      Toast.makeText(this,"GPS PROVIDER", Toast.LENGTH_LONG).show(); 
      ll = new GpsListener(); 
      //lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 100, 0,ll); 
      lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, ll); 

     }else if(lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){ 
//    Toast.makeText(this,"NETWORK PROVIDER.", Toast.LENGTH_LONG).show(); 
      ll = new GpsListener(); 
      lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0,0, ll); 

     }else{ 
      Toast.makeText(this,"GPS is disabled.", Toast.LENGTH_LONG).show(); 
      prog.dismiss(); 
     } 

あなたのOnCreateメソッド

に上記のコードを追加してのonCreateメソッドのうち、以下のクラスを作成

private class GpsListener implements LocationListener 
{ 

    public void onLocationChanged(Location location) { 
     // TODO Auto-generated method stub 
     float acc=-1; 
     if(location!=null) { 
      Toast.makeText(HomeScreen.hs,"Location Found", Toast.LENGTH_LONG).show(); 
      System.out.println("IN IF PART"); 

      if(location.hasAccuracy()) 
        acc = location.getAccuracy(); 

      lat = location.getLatitude(); 
      lon = location.getLongitude(); 
      isLocFound=true; 
      latitude = Double.toString(lat); 
      longitude = Double.toString(lon); 

      System.out.println("1)"+acc+" 2) "+latitude+" 3) "+longitude); 

      lm.removeUpdates(ll); 
      lm = null; 

      stopSelf(); 
      //stopForeground(true); 

     }else{ 
      Toast.makeText(HomeScreen.hs,"No Location Found", Toast.LENGTH_LONG).show(); 
      System.out.println("IN ELSE PART.."); 
     } 

     prog.dismiss(); 
    } 

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

    } 

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

    } 

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

    } 


}//end of Class 

・ホープ、このhelpss