在Google Maps中使用多標記Android

沒有可以訪問MainActivity類型的封閉實例。必須用封閉的MainActivity類型實例限定分配（例如，x.new A（），其中x是MainActivity的一個實例）。

錯誤在這行代碼中MyLocationListener.java在這行代碼

MyMapOverlays marker = new MyMapOverlays(p) ;

任何人出來幫我請？

繼承人的代碼：

MainActivity.class

package com.sample.dorm_locator_gps; 

import com.google.android.maps.GeoPoint; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapController; 
import com.google.android.maps.MapView; 
import android.os.Bundle; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Point; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 

public class MainActivity extends MapActivity { 
    LocationManager locMgr; 
    MyLocationListener locLstnr; 

    private MapView mapView; 
    private MapController mc; 

    /** Called when the activity is first created. */ 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     mapView = (MapView) findViewById(R.id.mapview1); 
     mc = mapView.getController(); 

     String coordinates[] = {"30", "71"}; 
     double lat = Double.parseDouble(coordinates[0]); 
     double lng = Double.parseDouble(coordinates[1]); 

     GeoPoint p = new GeoPoint(
       (int) (lat * 1E6), 
       (int) (lng * 1E6)); 

     mc.animateTo(p); 
     mc.setZoom(7); 
     mapView.invalidate(); 
    } 

    @Override 
    protected boolean isRouteDisplayed() { 
     // TODO Auto-generated method stub 
     return false; 
    } 

    /*My overlay Class starts*/ 
    class MyMapOverlays extends com.google.android.maps.Overlay 
    { 
     GeoPoint location = null; 

     public MyMapOverlays(GeoPoint location) 
     { 
      super(); 
      this.location = location; 
     } 

     @Override 
     public void draw(Canvas canvas, MapView mapView, boolean shadow) 
     { 
      super.draw(canvas, mapView, shadow); 
      //translate the screen pixels 
      Point screenPoint = new Point(); 
      mapView.getProjection().toPixels(this.location, screenPoint); 

      //add the image 
      canvas.drawBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.our_cross_image), 
        screenPoint.x, screenPoint.y , null); //Setting the image &nbsp;location on the screen (x,y). 
     } 
    } 
    /*My overlay Class ends*/ 
}

MyLocationListener.java

package com.sample.dorm_locator_gps; 

import java.util.List; 
import com.google.android.maps.GeoPoint; 
import com.google.android.maps.MapController; 
import com.google.android.maps.MapView; 
import com.sample.dorm_locator_gps.MainActivity.MyMapOverlays; 

import android.content.Context; 
import android.location.Location; 
import android.location.LocationListener; 
import android.os.Bundle; 
import android.widget.Toast; 

public class MyLocationListener implements LocationListener 
{ 
    private MapController mc; 
    private MapView mapView; 

    public void onLocationChanged(Location loc) { 
     // TODO Auto-generated method stub 
     loc.getLatitude(); 
     loc.getLongitude(); 
     String Text = "My current location is: " + "Latitud = " + 
     loc.getLatitude() + "Longitud = " + loc.getLongitude(); 
     Toast.makeText(getApplicationContext(), Text, Toast.LENGTH_SHORT).show(); 

     String coordinates[] = {""+loc.getLatitude(), ""+loc.getLongitude()}; 
     double lat = Double.parseDouble(coordinates[0]); 
     double lng = Double.parseDouble(coordinates[1]); 
     GeoPoint p = new GeoPoint((int) (lat * 1E6),(int) (lng * 1E6)); 
     mc.animateTo(p); 
     mc.setZoom(7); 

     //add a location marker. 
     MyMapOverlays marker = new MyMapOverlays(p) ; 
     List listOfOverLays = mapView.getOverlays(); 
     listOfOverLays.clear(); 
     listOfOverLays.add(marker); 
     mapView.invalidate(); 
    } 

    private Context getApplicationContext() { 
     // TODO Auto-generated method stub 
     return null; 

    } 

    public void onProviderDisabled(String provider) { 
     // TODO Auto-generated method stub 
     Toast.makeText(getApplicationContext(),"Gps Disabled", Toast.LENGTH_SHORT).show(); 

    } 

    public void onProviderEnabled(String provider) { 
     // TODO Auto-generated method stub 
     Toast.makeText(getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show(); 
    } 

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

來源

2012-10-05 user1519463