如何在android中的mapview上方移动覆盖项？

Question

我必须不断地获取当前位置并在android中的mapview上移动overlayitem？ 我已经使用以下代码来获取当前位置，我必须使用不同的类来获取当前位置并实现其方法，但我无法在活动之上持续获取当前位置。

**CurentLocation.java** 
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 CurrentLocation { 
    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); 
    } 
} 

主要activity.java

public class ManinActivity extends MapActivity { 

    double currentLatitude=666.563961600000000000; 
    double currentLongitude=66666.334281799999980000; 
    MapView mapView; 
    MapController mc; 
    GeoPoint p; 

     public void onCreate(Bundle savedInstanceState) 
     { 

      //===========Call Current location== 
      CurrentLocation myLocation = new CurrentLocation(); 
      myLocation.getLocation(this, locationResult); 
       } 

    LocationResult locationResult = new LocationResult(){ 
       @Override 
       public void gotLocation(Location location){ 
        if(location!=null) 
        { 
        currentLatitude=location.getLatitude(); 
        currentLongitude=location.getLongitude() ; 

        } 
       } 
      }; 

} 

请帮

Answer 1

在LocationListener

lm.removeUpdates(this); 
    lm.removeUpdates(locationListenerGps); 

更新删除这些行

如果你还不想停止计时器随后也删除这条线在你LocationListener

timer1.cancel(); 

更多更新

你还需要在你的GetLastLocation类中删除这些行

lm.removeUpdates(locationListenerGps); 
lm.removeUpdates(locationListenerNetwork);