Eclipse 开发 Android, Hello, MapView （学习5）

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Hello, MapView

学习地址： http://androidappdocs.appspot.com/guide/tutorials/views/hello-mapview.html
 
HelloItemizedOverlay.java代码
package com.example.test;import java.util.ArrayList;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>();public HelloItemizedOverlay(Drawable defaultMarker) {super(boundCenterBottom(defaultMarker));// TODO Auto-generated constructor stub}@Overridepublic int size() {return mOverlays.size();}public void addOverlay(OverlayItem overlay) {    mOverlays.add(overlay);    populate();}@Overrideprotected OverlayItem createItem(int i) {  return mOverlays.get(i);}} 
HelloMapView1.java代码
package com.example.test;import java.util.List;import android.graphics.drawable.Drawable;import android.os.Bundle;import android.widget.LinearLayout;import android.widget.ZoomControls;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;public class HelloMapView1 extends MapActivity {LinearLayout linearLayout;MapView mapView;ZoomControls mZoom;List<Overlay> mapOverlays;Drawable drawable;HelloItemizedOverlay itemizedOverlay;    /** 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.mapview);         mapView.setBuiltInZoomControls(true);                   mapOverlays = mapView.getOverlays();        drawable = this.getResources().getDrawable(R.drawable.androidmarker);        itemizedOverlay = new HelloItemizedOverlay(drawable);                        GeoPoint point = new GeoPoint(19240000,-99120000);        OverlayItem overlayitem = new OverlayItem(point, "", "");                itemizedOverlay.addOverlay(overlayitem);        mapOverlays.add(itemizedOverlay);            }        @Override    protected boolean isRouteDisplayed() {        return false;    }    } Layout->mail.xml
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/mainlayout"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent" >    <com.google.android.maps.MapView        android:id="@+id/mapview"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:clickable="true"        android:apiKey="Your Maps API Key"    /><LinearLayout    android:id="@+id/zoomview"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_alignBottom="@id/mapview"    android:layout_centerHorizontal="true"/></RelativeLayout> 
执行 android Application ，发现无法显示google的地图，请知道原因的朋友告诉一下我，谢谢。