如何在安卓地图视图上方移动叠加项目

Question

我必须连续获取当前位置并在 android 的地图视图上移动叠加项目？我使用以下代码来获取当前位置，为此我必须使用不同的类来获取当前位置并实现其方法，但我无法在活动上方连续获取当前位置。

**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);
    }
}

主要活动.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() ;
                    }
                }
            };
}

请帮忙

Answer 1

删除LocationListener中的这些行

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

更新

此外，如果您不想停止计时器，请在LocationListener中删除此行

 timer1.cancel();

更多更新

您还需要在GetLastLocation类中删除这些行

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