java - error with google map v2 -

i trying display or see google maps on app.

1. i have added library google_play_services_lib(no error).
2. obtain google maps api key.
3. follow code in http://www.vogella.com/tutorials/androidgooglemaps/article.html#overview_intro (no error).
4. but run app in emulator, stopped. says "unfortunately showmapactivity has stopped ".

i not getting error. think problem in xml file.fragment not working. should now. plz me or give me simple sample project using google map. beginner @ google map in android , trying badly fix but......:(

here activity_main.xml file :

    <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"      tools:context=".mainactivity" >          <fragment             android:id="@+id/map"             android:layout_width="match_parent"             android:layout_height="match_parent"             class="com.google.android.gms.maps.mapfragment" />       </relativelayout>  

mainactivity.java file :

    package com.vogella.android.locationapi.maps;      import android.app.activity;     import android.os.bundle;     import android.view.menu;      import com.google.android.gms.maps.cameraupdatefactory;     import com.google.android.gms.maps.googlemap;       import com.google.android.gms.maps.mapfragment;     import com.google.android.gms.maps.model.bitmapdescriptorfactory;     import com.google.android.gms.maps.model.latlng;     import com.google.android.gms.maps.model.marker;     import com.google.android.gms.maps.model.markeroptions;      public class mainactivity extends activity {     static final latlng hamburg = new latlng(53.558, 9.927);     static final latlng kiel = new latlng(53.551, 9.993);     private googlemap map;      @override     protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     /*map = ((mapfragment) getfragmentmanager().findfragmentbyid(r.id.map))     .getmap();     marker hamburg = map.addmarker(new markeroptions().position(hamburg)     .title("hamburg"));     marker kiel = map.addmarker(new markeroptions()     .position(kiel)     .title("kiel")     .snippet("kiel cool")     .icon(bitmapdescriptorfactory         .fromresource(r.drawable.ic_launcher)));      // move camera instantly hamburg zoom of 15.     map.movecamera(cameraupdatefactory.newlatlngzoom(hamburg, 15));      // zoom in, animating camera.     map.animatecamera(cameraupdatefactory.zoomto(10), 2000, null);     */  }      @override     public boolean oncreateoptionsmenu(menu menu) {     getmenuinflater().inflate(r.menu.main, menu);     return true;     }     } 

and androidmanifest.xml file:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.vogella.android.locationapi.maps" android:versioncode="1" android:versionname="1.0" >  <uses-sdk     android:minsdkversion="11"     android:targetsdkversion="19" />  <permission     android:name="com.vogella.android.locationapi.maps.permission.maps_receive"     android:protectionlevel="signature" />  <uses-feature     android:glesversion="0x00020000"     android:required="true" />  <uses-permission  android:name="com.vogella.android.locationapi.maps.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" />  <application     android:allowbackup="true"     android:icon="@drawable/ic_launcher"     android:label="@string/app_name"     android:theme="@style/apptheme" >     <activity         android:name="com.vogella.android.locationapi.maps.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.aizasyadyrvyrg68lvuq0721d_iaw0vlaemjnua"         android:value="aizasyadyrvyrg68lvuq0721d_iaw0vlaemjnua" /> </application>   </manifest>  

replace meta-data in androidmanifest.xml file one.

<meta-data android:name="com.google.android.maps.v2.api_key" android:value="aizasyadyrvyrg68lvuq0721d_iaw0vlaemjnua" />

also add meta-data too.

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

hope solve problems.