为什么此代码通过GPS无法获取位置？

Question

即使启用GPS并且所有位置管理器和侦听器设置正确，我也无法获取位置。这是我到目前为止：

public class GpsTest extends Activity { 
    private TextView text; 
    private LocationManager manager; 
    private LocationListener listener; 
    private Location myLocation; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    text = (TextView)findViewById(R.id.textView1); 
try 
{ 
    manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
    myLocation = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER); //"gps" 
    text.setText(("Lat: " + myLocation.getLatitude() 
       + "\nLLong: " + myLocation.getLongitude())); 
    listener = new MyLocationListener(); 
    manager.requestLocationUpdates(
            LocationManager.GPS_PROVIDER, 
            0, 
            1, 
            listener); 
    if (manager.isProviderEnabled(LocationManager.GPS_PROVIDER)){ 
     Toast.makeText(this, "GPS is enable. ", Toast.LENGTH_SHORT).show(); 
    } 
    else createGpsDisabledAlert(); 
}catch(Exception ex) 
{ 
    createGpsDisabledAlert(); 
} 
     } 


public void onclicklistener(View v){ 
    try 
    { 
     text.setText(("Lat: " + myLocation.getLatitude() 
       + "\nLLong: " + myLocation.getLongitude())); 
    }catch(Exception ex) 
    { 
    Toast.makeText(this, "Error while getting locations. "+ex.toString(), Toast.LENGTH_SHORT).show(); 
    } 
    } 
    private void createGpsDisabledAlert(){ 
     AlertDialog.Builder builder = new AlertDialog.Builder(this); 
     builder.setMessage("GPS is disabled! Would you like to enable it?") 
      .setCancelable(false) 
      .setPositiveButton("Enable GPS", 
       new DialogInterface.OnClickListener(){ 
       public void onClick(DialogInterface dialog, int id){ 
        showGpsOptions(); 
       } 
      }); 
      builder.setNegativeButton("No Thanks", 
       new DialogInterface.OnClickListener(){ 
       public void onClick(DialogInterface dialog, int id){ 
        dialog.cancel(); 
       } 
      }); 
     AlertDialog alert = builder.create(); 
     alert.show(); 
     } 
    private void showGpsOptions(){ 
     Intent gpsOptionsIntent = new Intent( 
       android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
     startActivity(gpsOptionsIntent); 
    } 



    private class MyLocationListener implements LocationListener{ 
       public void onLocationChanged(Location location) { 

         // TODO Auto-generated method stub 
         if (location != null){ 
           text.setText(("Lat: " + location.getLatitude() 
             + "\nLLong: " + location.getLongitude())); 
         } 
         Toast.makeText(GpsTest.this, ""+location, Toast.LENGTH_SHORT).show(); 
       } 
       public void onProviderDisabled(String provider) { 
         // TODO Auto-generated method stub 
       } 
       public void onProviderEnabled(String provider) { 
         // TODO Auto-generated method stub 

       } 
       @Override 
       public void onStatusChanged(String arg0, int arg1, Bundle arg2) { 
        // TODO Auto-generated method stub 

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

Answer 1

你必须使用一个线程与他的run（）方法是这样的（是西班牙语，我希望这不是你的问题）

@Override 
public void run() { 

    mLocationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE); 

    if (mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) { 
     Looper.prepare(); 
     mToast.Make(getContext(),"GPS",0); 
     mLocationListener = new MyLocationListener(); 
     mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mLocationListener); 
     Looper.loop(); 
     Looper.myLooper().quit(); 

    } else if (mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){ 
     Looper.prepare(); 
     mToast.Make(getContext(),"Triangulacion",0); 
     mLocationListener = new MyLocationListener(); 
     mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationListener); 
     Looper.loop(); 
     Looper.myLooper().quit(); 
    }else{ 
     mToast.Make(context,"No se encuentra señal se procede a mandar un mensaje normal",0); 
     Looper.prepare(); 
     handlerNormal.sendEmptyMessage(0); 
     Looper.loop(); 
     Looper.myLooper().quit(); 
    } 

} 

Answer 2

您是在仿真器还是真实设备上测试？如果您正在仿真器上测试，请检查此http://www.javacodegeeks.com/2010/09/android-location-based-services.html并阅读有关位置控制的DDMS部分。您需要首次提供一些虚拟位置数据，之后它将抓取您当前的位置。