android google mapview显示白格子问题

网上也看了其他的博客帖子，就是不显示地图，愁死我了，请各位帮忙看下，谢谢了package com.dzy.map;import java.util.List;
import java.util.Locale;import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;import com.google.android.maps.*;public class MyMapActivity extends MapActivity { private MapView mapView;
private MapController mapController;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_map);
//setContentView(R.id.map_view);
mapView = (MapView)findViewById(R.id.map_view);
mapController = mapView.getController();
mapView.setSatellite(true);
mapView.setStreetView(true);
mapView.setTraffic(true);
mapView.setClickable(true);

GeoPoint center = mapView.getMapCenter();
int latSpan = mapView.getLatitudeSpan();
int longSpan = mapView.getLongitudeSpan();

int x = 10;
int y = 10;
MapView.LayoutParams lp;
lp = new MapView.LayoutParams(MapView.LayoutParams.WRAP_CONTENT, MapView.LayoutParams.WRAP_CONTENT, x, y,MapView.LayoutParams.TOP_LEFT);

View zoomControls = mapView.getZoomControls();
mapView.addView(zoomControls,lp);
mapView.displayZoomControls(false);
mapController.setZoom(17);

LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager)getSystemService(context);


Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria, true);

Location location = locationManager.getLastKnownLocation(provider);

updateWithNewLocation(location);

locationManager.requestLocationUpdates(provider, 2000, 10, new LocationListener(){ @Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
updateWithNewLocation(location);
} @Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
updateWithNewLocation(null);
} @Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub

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

}


});

} @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my_map, menu);
return true;
}

protected boolean isRouteDisplayed(){
return false;
}

private void updateWithNewLocation(Location location){

String latLongString;
TextView myLocationText = (TextView)findViewById(R.id.myLoactionText);
String addressString = "No addressfound";
if(location != null){
double geoLat = location.getLatitude()*1E6;
double geoLng = location.getLongitude()*1E6;
GeoPoint point = new GeoPoint((int)geoLat,(int)geoLng);
mapController.animateTo(point);
double lat = location.getLatitude();
double lng = location.getLongitude();
latLongString = "Lat:"+lat+" Lng:"+lng;

double latitude = location.getLatitude();
double longitude = location.getLongitude();

Geocoder gc = new Geocoder(this,Locale.getDefault());

try{

List<Address> addresses = gc.getFromLocation(latitude, longitude, 1);
StringBuilder sb = new StringBuilder();
if(addresses.size() > 0){

Address address = addresses.get(0);

for(int i=0;i<address.getMaxAddressLineIndex();i++){

sb.append(address.getAddressLine(i)).append("\n");
sb.append(address.getLocality()).append("\n");
sb.append(address.getPostalCode()).append("\n");
sb.append(address.getCountryName());

}
addressString = sb.toString();
}

}catch(Exception e){

}

}else{

latLongString = "No location found";

}

myLocationText.setText("Your current position is:\n"+latLongString+"\n"+addressString);
}}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.dzy.map"
    android:versionCode="1"
    android:versionName="1.0" >    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="8" />
     <meta-data android:name="com.google.android.maps.v2.API_KEY" 
                   android:value="AIzaSyAQSZmD5QIWye2kxcZnaiV8CZtwSNPB344" />
      <permission 
              android:name="com.dzy.map.permission.MAPS_RECEIVE" 
              android:protectionLevel="signature"/> 
            <uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE"/> 
            <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />"
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.maps"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission> 
<uses-permission android:name="android.permission.INTERNET"/>//赋予各种权限<uses-feature android:glEsVersion="0x00020000" android:required="true"/>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <uses-library android:name="com.google.android.maps"/>//加载google地图包
        
        <activity
            android:name="com.dzy.map.MyMapActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data android:name="com.google.android.maps.v2.API_KEY" 
                   android:value="AIzaSyAQSZmD5QIWye2kxcZnaiV8CZtwSNPB344" />
    </application> </manifest>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MyMapActivity" >    <TextView
        android:id="@+id/myLoactionText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="hello"
        
        />
    <com.google.android.maps.MapView
        android:id="@+id/map_view"
        class="com.google.android.maps.MapView "
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:enabled="true"
        android:clickable="true"
        android:apiKey="AIzaSyAQSZmD5QIWye2kxcZnaiV8CZtwSNPB344" 
        />
    </LinearLayout>