Comment afficher la carte Google Map v2 dans Android

Question

Je souhaite afficher la carte Google dans une application Android, mais la carte ne s'affiche pas. Il génère une exception d'exécution. J'ajoute la bibliothèque google-play-services_lib avec succès.

J'utilise le code suivant:

activity.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: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=".MainActivity" > 


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

mon fichier manifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="info.tekguc.umut.googlemapsmapsandroidv2" 
android:versionCode="1" 
android:versionName="1.0" > 

<uses-sdk 
    android:minSdkVersion="14" 
    android:targetSdkVersion="17" /> 


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

<uses-permission android:name="com.example.androidmapview.permission.MAPS_RECEIVE" /> 
<uses-permission 
    android:name="com.example.androidmapsv2.permission.MAPS_RECEIVE"/> 
<uses-permission 
    android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/> 
<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-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" > 
     <meta-data 
     android:name="com.google.android.maps.v2.API_KEY" 
     android:value="AIzaSyBqkAj48WktmfULPBYgoXBGhYzSACisR5Q"/> 
    <activity 
     android:name="info.tekguc.umut.googlemapsmapsandroidv2.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> 
</application> 

et mon chat journal:

07-01 15:43:49.491: E/Trace(2439): error opening trace file: No such file or directory (2) 
07-01 15:43:50.221: E/AndroidRuntime(2439): FATAL EXCEPTION: main 
07-01 15:43:50.221: E/AndroidRuntime(2439): java.lang.RuntimeException: Unable to start activity ComponentInfo{info.tekguc.umut.googlemapsmapsandroidv2/info.tekguc.umut.googlemapsmapsandroidv2.MainActivity}: java.lang.NullPointerException 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.app.ActivityThread.access$600(ActivityThread.java:130) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.os.Looper.loop(Looper.java:137) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at java.lang.reflect.Method.invoke(Method.java:511) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at dalvik.system.NativeStart.main(Native Method) 
07-01 15:43:50.221: E/AndroidRuntime(2439): Caused by: java.lang.NullPointerException 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at info.tekguc.umut.googlemapsmapsandroidv2.MainActivity.onCreate(MainActivity.java:24) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.app.Activity.performCreate(Activity.java:5008) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
07-01 15:43:50.221: E/AndroidRuntime(2439):  ... 11 more 

et mon code MainActivity est

public class MainActivity extends Activity { 

private GoogleMap mMap; 

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

    mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap(); 
    mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE); 
    final LatLng CIU = new LatLng(35.21843892856462, 33.41662287712097); 
    Marker ciu = mMap.addMarker(new MarkerOptions() 
           .position(CIU).title("My Office")); 
} 

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

Answer 1

Essayez ceci,

public class MainActivity extends android.support.v4.app.FragmentActivity { 

private GoogleMap mMap; 

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

    mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); 
    mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE); 
    final LatLng CIU = new LatLng(35.21843892856462, 33.41662287712097); 
    Marker ciu = mMap.addMarker(new MarkerOptions() 
           .position(CIU).title("My Office")); 
} 
} 

Answer 2

Vous devez modifier le fragment XML déclaré comme je montre ci-dessous:

Et aussi remplacer:

mMap= ((MapFragment) getSupportFragmentManager().findFragmentById(R.id.map)) 
       .getMap(); 

Par la suivante:

mMap= ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)) 
       .getMap(); 

Par ailleurs, assurez-vous étendez un FragmentActivity au lieu de Activity.

public class MainActivity extends FragmentActivity