Mes pas:
- obtenu le code SHA1 de debug.keystore
- créer une application dans la console google apis
- activé google map api v2
- entrée SHA1; my.package.name
- obtenir la clé API
- a créé le fichier AndroidManifest: - <permission android:name="my.package.name.permission.MAPS_RECEIVE" android:protectionLevel="signature"/> <uses-permission android:name="my.package.name.permission.MAPS_RECEIVE"/> <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15"/> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> <uses-feature android:glEsVersion="0x00020000" android:required="true"/> <application android:label="@string/app_name" android:icon="@drawable/ic_launcher" android:hardwareAccelerated="true"> <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="MY_API_KEY_HERE" /> <activity android:name="MyActivity" 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>
- mise en page créée 
- mettre "google-play-services.jar" dans les bibliothèques
Après la compilation, j'ai un crash:
  ERROR/AndroidRuntime(10182): FATAL EXCEPTION: main
                java.lang.NoClassDefFoundError: com.google.android.gms.R$styleable
                at com.google.android.gms.maps.GoogleMapOptions.createFromAttributes(Unknown Source)
                at com.google.android.gms.maps.MapFragment.onInflate(Unknown Source)
                at android.app.Activity.onCreateView(Activity.java:4716)
                at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
                at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
                at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
                at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
                at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
                at android.app.Activity.setContentView(Activity.java:1881)
                at com.example.gm2.MyActivity.onCreate(MyActivity.java:16)
                at android.app.Activity.performCreate(Activity.java:5104)
                at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
                at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
                at android.app.ActivityThread.access$600(ActivityThread.java:141)
                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
                at android.os.Handler.dispatchMessage(Handler.java:99)
                at android.os.Looper.loop(Looper.java:137)
                at android.app.ActivityThread.main(ActivityThread.java:5039)
                at java.lang.reflect.Method.invokeNative(Native Method)
                at java.lang.reflect.Method.invoke(Method.java:511)
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
                at dalvik.system.NativeStart.main(Native Method)
Après cela, j'ai changé la mise en page pour:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
             android:id="@+id/map"
             android:layout_width="match_parent"
             android:layout_height="match_parent" />
et a changé MyActivity en
  super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    FragmentManager manager = getFragmentManager();
    FragmentTransaction transaction = manager.beginTransaction();
    transaction.add(R.id.map, MapFragment.newInstance());           
    transaction.commit();
En conséquence, l'application a été lancée, mais je n'ai pas vu la carte.
Journal de la console:
ERROR/Google Maps Android API(10369): Authorization failure.

