android - Android の Google マップは現在の場所を表示します。地図が表示されない

Question

このチュートリアルに従っていますAPI v2を使用してGoogleマップで現在の場所を表示していますが、何をしてもマップが表示されません。ズーム用のボタンを除いて、画面はすべて灰色です。インターネットのアクセス許可を追加し、API キー (v2) を何十回も生成しました ([新しい Android キーを作成...] を選択し、SHA1 証明書のフィンガープリントを入力すると、正常に生成されます)、GPS が有効になっています。 .. もうどうしたらいいのかわからない。ここに私のコードとマニフェストがあります:

package com.example.myexample;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Dialog;
import android.support.v4.app.FragmentActivity;
import android.widget.TextView;

public class MainActivity extends FragmentActivity implements LocationListener {

    GoogleMap googleMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    // Getting Google Play availability status
        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext());

        if(status!=ConnectionResult.SUCCESS){ 
            int requestCode = 10;
            Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode);
            dialog.show();
        }

        else { 

            // Getting reference to the SupportMapFragment of activity_main.xml
            SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
            // Getting GoogleMap object from the fragment
            googleMap = fm.getMap();
            // Enabling MyLocation Layer of Google Map
            googleMap.setMyLocationEnabled(true); 
            // Getting LocationManager object from System Service LOCATION_SERVICE
            LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); 
            // Creating a criteria object to retrieve provider
            Criteria criteria = new Criteria(); 
            // Getting the name of the best provider
            String provider = locationManager.getBestProvider(criteria, true);
            // Getting Current Location
            Location location = locationManager.getLastKnownLocation(provider);

            if(location!=null){
                onLocationChanged(location);
            }
            locationManager.requestLocationUpdates(provider, 20000, 0, this);
        }
    }

    @Override
    public void onLocationChanged(Location location) {

        TextView tvLocation = (TextView) findViewById(R.id.tv_location); 
        // Getting latitude of the current location
        double latitude = location.getLatitude();
        // Getting longitude of the current location
        double longitude = location.getLongitude();
        // Creating a LatLng object for the current location
        LatLng latLng = new LatLng(latitude, longitude);
        // Showing the current location in Google Map
        googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        // Zoom in the Google Map
        googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
        // Setting latitude and longitude in the TextView tv_location
        tvLocation.setText("Latitude:" +  latitude  + ", Longitude:"+ longitude );
    }

@Override
    public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub
    }

    @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
    }
}

マニフェスト:

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

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <permission
        android:name="com.example.myexample.permission.MAPS_RECEIVE"
        android:protectionLevel="signature"/>

    <uses-permission android:name="com.example.myexample.permission.MAPS_RECEIVE"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

    <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" >
        <activity
            android:name="com.example.myexample.MainActivity"
            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="my api"/>

    </application>

</manifest>