The Android app displays the blank Google map v2 screen with the zoom button and the Google logo

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I integrate google map v2 in my android app. it show blank screen with zoom button and google logo. its saved instance is also null. I signed my app with debug certificate now but at fist i signed with release.store. before it was show error like not contact with google server. when i signed app with
debug.store it shows response in adb like

map = [email protected]

aid = [email protected]c070

aic = null

Android Manifest

    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bilawalkhan.pakistanmap" >
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <!-- The following two permissions are not required to use
         Google Maps Android API v2, but are recommended. -->
    <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=".Map"
            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.gms.version"
            android:value="@integer/google_play_services_version" />
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyCLgSPDsNfVrGFPO2636kWMXIAaZu2f43p"/>
    </application>

</manifest>

Main_Activity is

  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_map);
    // Get a handle to the Map Fragment
   GoogleMap map = ((MapFragment) getFragmentManager()
            .findFragmentById(R.id.map)).getMap();

    LatLng sydney = new LatLng(-33.867, 151.206);

    map.setMyLocationEnabled(true);
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 13));

    map.addMarker(new MarkerOptions()
            .title("Sydney")
            .snippet("The most populous city in Australia.")
            .position(sydney));
}

map.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".Map">
<fragment
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:name="com.google.android.gms.maps.MapFragment"/>

its debugger shows like this.

map = [email protected]
aid = [email protected]c070
>aic = null

Logcat shows:

10-29 18:40:44.200    3621-3806/com.bilawalkhan.maptesting D/REQUEST﹕ Connection opened to:https://clients4.google.com/glm/mmap/api
10-29 18:40:44.200    3621-3806/com.bilawalkhan.maptesting D/REQUEST﹕ Open Connection
10-29 18:40:45.640    1958-2182/com.bluestacks.gamepophome D/[InMobi]-[Analytics]-4.4.3﹕ Http Status Code: 200
10-29 18:40:45.640    1958-2182/com.bluestacks.gamepophome D/[InMobi]-[Analytics]-4.4.3﹕ IMAppDatabaseManager->deleteEvents
10-29 18:40:45.640    1958-2182/com.bluestacks.gamepophome D/[InMobi]-[Analytics]-4.4.3﹕ Ping Response: {"success":true}
10-29 18:40:45.700    3621-3806/com.bilawalkhan.maptesting D/REQUEST﹕ Processing DataRequest: [email protected]
10-29 18:40:45.720    3621-3806/com.bilawalkhan.maptesting D/REQUEST﹕ Processing DataRequest: [email protected]
10-29 18:40:45.730    3621-3806/com.bilawalkhan.maptesting D/REQUEST﹕ Processing DataRequest: [email protected]
10-29 18:40:45.820    3621-3806/com.bilawalkhan.maptesting D/REQUEST﹕ Processing DataRequest: [email protected]
10-29 18:40:45.820    3621-3795/com.bilawalkhan.maptesting D/USER_EVENTS﹕ Event: type=22, status: fb, data: 1510
10-29 18:40:45.830    3621-3795/com.bilawalkhan.maptesting D/USER_EVENTS﹕ Event: type=22, status: lb, data: 1630
10-29 18:40:45.830    3621-3795/com.bilawalkhan.maptesting D/USER_EVENTS﹕ Event: type=22, status: flbs, data: fb=1510|lb=1630|s=1100
10-29 18:40:45.830    3621-3806/com.bilawalkhan.maptesting D/REQUEST﹕ DRD(0): 62|75|75|147, 1s, 1kb
10-29 18:40:45.830    3621-3806/com.bilawalkhan.maptesting D/REQUEST﹕ Close
10-29 18:41:08.790    1898-2812/com.bluestacks.bstfolder D/dalvikvm﹕ GC_FOR_ALLOC freed 606K, 24% free 2686K/3508K, paused 10ms, total 10ms
10-29 18:41:15.690    1958-2182/com.bluestacks.gamepophome D/[InMobi]-[Analytics]-4.4.3﹕ NetworkManager->handleMessag: msg:{ when=-40ms what=1001 target=android.os.Handler }
10-29 18:41:15.700    1958-2182/com.bluestacks.gamepophome D/[InMobi]-[Analytics]-4.4.3﹕ IMAppDatabaseManager->getEvents
10-29 18:41:15.710    1958-2182/com.bluestacks.gamepophome D/[InMobi]-[Analytics]-4.4.3﹕ PayloadBuilder->getPayloadList:
10-29 18:41:53.870    1898-2812/com.bluestacks.bstfolder D/dalvikvm﹕ GC_FOR_ALLOC freed 606K, 24% free 2678K/3508K, paused 0ms, total 0m


Try like this:

layout.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.MapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

MainActivity.java

public class MainActivity extends Activity {

    // Google Map
    private GoogleMap googleMap;

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

        try {
            // Loading map
            initilizeMap();

            // Changing map type
            googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
            // googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
            // googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
            // googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
            // googleMap.setMapType(GoogleMap.MAP_TYPE_NONE);

            // Showing / hiding your current location
            googleMap.setMyLocationEnabled(true);

            // Enable / Disable zooming controls
            googleMap.getUiSettings().setZoomControlsEnabled(false);

            // Enable / Disable my location button
            googleMap.getUiSettings().setMyLocationButtonEnabled(true);

            // Enable / Disable Compass icon
            googleMap.getUiSettings().setCompassEnabled(true);

            // Enable / Disable Rotate gesture
            googleMap.getUiSettings().setRotateGesturesEnabled(true);

            // Enable / Disable zooming functionality
            googleMap.getUiSettings().setZoomGesturesEnabled(true);

            double latitude = 21.3235752;
            double longitude =74.1881265;

            // lets place some 10 random markers

                // random latitude and logitude
                double[] randomLocation = createRandLocation(latitude,
                        longitude);

                // Adding a marker
                MarkerOptions marker = new MarkerOptions().position(
                        new LatLng(randomLocation[0], randomLocation[1]))
                        .title(" Mapview Test ");

                    //marker.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
                marker.icon(BitmapDescriptorFactory.fromResource(R.drawable.marker));
                googleMap.addMarker(marker);

                // Move the camera to last position with a zoom level

                    CameraPosition cameraPosition = new CameraPosition.Builder()
                            .target(new LatLng(randomLocation[0],
                                    randomLocation[1])).zoom(15).build();

                    googleMap.animateCamera(CameraUpdateFactory
                            .newCameraPosition(cameraPosition));

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    @Override
    protected void onResume() {
        super.onResume();
        initilizeMap();
    }

    /**
     * function to load map If map is not created it will create it for you
     * */
    @SuppressLint("NewApi")
    private void initilizeMap() {
        if (googleMap == null) {
            googleMap = ((MapFragment) getFragmentManager().findFragmentById(
                    R.id.map)).getMap();

            // check if map is created successfully or not
            if (googleMap == null) {
                Toast.makeText(getApplicationContext(),
                        "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }

    /*
     * creating random postion around a location for testing purpose only
     */
    private double[] createRandLocation(double latitude, double longitude) {

        return new double[] { latitude + ((Math.random() - 0.5) / 500),
                longitude + ((Math.random() - 0.5) / 500),
                150 + ((Math.random() - 0.5) * 10) };
    }
}

Manifest Permissions and API

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

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <!-- Required to show current location -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <!-- meta-data before </application> tag -->
       <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyDxEkfvGvKy.........your api key" />

         <meta-data android:name="com.google.android.gms.version"
      android:value="@integer/google_play_services_version" />