Mapa do Android não carrega

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="br.com.MapaAndroid"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />
    
    <uses-permission android:name="android.permission.INTERNET" />
    <application       
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        
        <uses-library android:name="com.google.android.maps"/>
        <activity
            android:name=".MapaAndroid"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

package br.com.MapaAndroid;

import java.util.List;

import br.com.MapaAndroid.R.id;

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 MapaAndroid 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(id.mapview);
        mapView.setBuiltInZoomControls(true);
        
        List<Overlay> mapOverlays = mapView.getOverlays();
        Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker);
        HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable, this);
        
        GeoPoint point = new GeoPoint(19240000,-99120000);
        OverlayItem overlayitem = new OverlayItem(point, "Hola, Mundo!", "I'm in Mexico City!"); 
        GeoPoint point2 = new GeoPoint(35410000, 139460000);
        OverlayItem overlayitem2 = new OverlayItem(point2, "Sekai, konichiwa!", "I'm in Japan!");
        
        itemizedoverlay.addOverlay(overlayitem);
        itemizedoverlay.addOverlay(overlayitem2);
        mapOverlays.add(itemizedoverlay);
        
        
            
    }

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

package br.com.MapaAndroid;

import java.util.ArrayList;

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

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, Context context) {
		super(boundCenterBottom(defaultMarker));
		// TODO Auto-generated constructor stub
		 mContext = context;
	}

	public void addOverlay(OverlayItem overlay) {    
		mOverlays.add(overlay);
		populate();
	}
	
	@Override
	protected OverlayItem createItem(int i) {
		// TODO Auto-generated method stub
		return mOverlays.get(i);
	}

	@Override
	public int size() {
		// TODO Auto-generated method stub
		 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;
	}

}