片段中的位置監聽器

Question

我可以在片段中將LocationListener與LocationManager一起使用嗎？實際上，當我使用它，它給了我在這行錯誤lm.requestLocationUpdates（LocationManager.GPS_PROVIDER，0,0，（android.location.LocationListener）this）;當我不蒙上第四參數android.location.LocationListener它給我的錯誤..

import android.content.Context; 
import android.location.Location; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.TextView; 


public class Speedometer extends Fragment implements LocationListener { 

    TextView txt; 
    public Speedometer(){} 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { 

     View rootView = inflater.inflate(R.layout.speedometer, container, false); 

     txt=(TextView)rootView.findViewById(R.id.speedometer); 

     LocationManager lm= (LocationManager)getActivity().getSystemService(Context.LOCATION_SERVICE); 
     lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, (android.location.LocationListener) this); 

     return rootView; 
    } 

    @Override 
    public void onLocationChanged(Location location) { 

     if(location==null){ 
      txt.setText("-.- m/s"); 
     } 
     else { 
      float nCurrentSpeed=location.getSpeed(); 
      txt.setText(nCurrentSpeed+"m/s"); 
     } 
    } 
} 

Answer 1

我想你已經錯誤地執行com.google.android.gms.location.LocationListener接口，只有一個1抽象方法onLocationChanged

你應該而實現android.location.LocationListener有4種抽象方法

onLocationChanged(Location location)，

onProviderDisabled(String provider)，

onProviderEnabled(String provider)，

onStatusChanged(String provider, int status, Bundle extras)