Android：Googleマップで複数の場所が表示されています

Question

私はhttp://developer.android.com/resources/tutorials/views/hello-mapview.html#topチュートリアルを使用してマーカーを使用して地図に複数の場所を表示していますが、location.itにはmap.hereだけが表示されています。

package com.Map2; 

import java.util.List; 

import com.google.android.maps.GeoPoint; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapView; 
import com.google.android.maps.Overlay; 
import com.google.android.maps.OverlayItem; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 

public class Main extends MapActivity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     MapView mapView = (MapView) findViewById(R.id.theMap); 
     mapView.setBuiltInZoomControls(true); 


     List<Overlay> mapOverlays = mapView.getOverlays(); 
     Drawable drawable = this.getResources().getDrawable(R.drawable.marker); 
     HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable, this); 


     GeoPoint point = new GeoPoint(19240000,-99120000); 
     OverlayItem overlayitem = new OverlayItem(point, "Hola, Mundo!", "I'm in Mexico City!"); 

     itemizedoverlay.addOverlay(overlayitem); 
     mapOverlays.add(itemizedoverlay); 


     GeoPoint point2 = new GeoPoint(35410000, 139460000); 
     OverlayItem overlayitem2 = new OverlayItem(point2, "Sekai, konichiwa!", "I'm in Japan!"); 
     itemizedoverlay.addOverlay(overlayitem2); 
     mapOverlays.add(itemizedoverlay); 

    } 


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

私の他のクラスは

package com.Map2; 

import java.util.ArrayList; 

import android.app.AlertDialog; 
import android.content.Context; 
import android.graphics.drawable.Drawable; 

import com.google.android.maps.ItemizedOverlay; 
import com.google.android.maps.OverlayItem; 

public class HelloItemizedOverlay extends ItemizedOverlay { 

    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); 
    Context mContext; 


    public HelloItemizedOverlay(Drawable defaultMarker) { 
      super(boundCenterBottom(defaultMarker)); 
     } 

    public void addOverlay(OverlayItem overlay) { 
     mOverlays.add(overlay); 
     populate(); 
    } 

    @Override 
    protected OverlayItem createItem(int i) { 
     return mOverlays.get(i); 
    } 

    @Override 
    public int size() { 
     return mOverlays.size(); 
    } 

    public HelloItemizedOverlay(Drawable defaultMarker, Context context) { 
      super(defaultMarker); 
      mContext = context; 
     } 

    @Override 
    protected boolean onTap(int index) { 
     OverlayItem item = mOverlays.get(index); 
     AlertDialog.Builder dialog = new AlertDialog.Builder(mContext); 
     dialog.setTitle(item.getTitle()); 
     dialog.setMessage(item.getSnippet()); 
     dialog.show(); 
     return true; 
    } 

} 

はPlzをできるだけ早く私を助けて....です。ありがとうございました。あなた `HelloItemizedOverlay`クラスが2 contructorsを持っているのはなぜ

Answer 1

このHelloItemizedOverlayクラスコード

import java.util.ArrayList; 

import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.graphics.drawable.Drawable; 

import com.google.android.maps.ItemizedOverlay; 
import com.google.android.maps.OverlayItem; 

public class CustomItemizedOverlay extends ItemizedOverlay { 

    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); 
    private Context mContext; 
    public CustomItemizedOverlay(Drawable defaultMarker, Context context) { 
     super(boundCenterBottom(defaultMarker)); 
     mContext = context; 
    } 

    public void addOverlay(OverlayItem overlay) { 
     mOverlays.add(overlay); 
     populate(); 
    } 

    @Override 
    protected OverlayItem createItem(int i) { 
     return mOverlays.get(i); 
    } 

    @Override 
    public int size() { 
     return mOverlays.size(); 
    } 

    @Override 
    protected boolean onTap(int index) { 
     OverlayItem item = mOverlays.get(index); 
     AlertDialog.Builder dialog = new AlertDialog.Builder(mContext); 
     dialog.setTitle(item.getTitle()); 
     dialog.setMessage(item.getSnippet()); 
     dialog.show(); 
     return true; 
    } 
}