Question

I’m trying to learn how to set a client receiver using the google cloud messaging system and i’m following this Google’s tutorial: http://developer.android.com/guide/google/gcm/gs.html#android-app

I have done everything that the tutorial asks but when I run my application it works for a moment and then it crashes and this is the LogCat:

08-07 17:04:40.726: E/AndroidRuntime(8155): FATAL EXCEPTION: main
08-07 17:04:40.726: E/AndroidRuntime(8155): java.lang.RuntimeException: Unable to instantiate service com.example.google.cloud.messaging.GCMIntentService: java.lang.ClassNotFoundException: com.example.google.cloud.messaging.GCMIntentService in loader dalvik.system.PathClassLoader[/data/app/com.example.google.cloud.messaging-1.apk]
08-07 17:04:40.726: E/AndroidRuntime(8155):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:1933)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at android.app.ActivityThread.access$2500(ActivityThread.java:117)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:989)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at android.os.Looper.loop(Looper.java:130)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at android.app.ActivityThread.main(ActivityThread.java:3687)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at java.lang.reflect.Method.invokeNative(Native Method)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at java.lang.reflect.Method.invoke(Method.java:507)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at dalvik.system.NativeStart.main(Native Method)
08-07 17:04:40.726: E/AndroidRuntime(8155): Caused by: java.lang.ClassNotFoundException: com.example.google.cloud.messaging.GCMIntentService in loader dalvik.system.PathClassLoader[/data/app/com.example.google.cloud.messaging-1.apk]
08-07 17:04:40.726: E/AndroidRuntime(8155):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
08-07 17:04:40.726: E/AndroidRuntime(8155):     at android.app.ActivityThread.handleCreateService(ActivityThread.java:1930)

This is my code

public class MainActivity extends Activity {

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

        GCMRegistrar.checkDevice(this);
        GCMRegistrar.checkManifest(this);
        final String regId = GCMRegistrar.getRegistrationId(this);
        if (regId.equals("")) {
          GCMRegistrar.register(this, "962129210868");
          Log.i("Registrando","");
        } else {
          Log.i("Test", "Already registered");
        }
    }
}

And this is my Manifest

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.google.cloud.messaging"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <permission
        android:name="com.example.google.cloud.messaging.permission.C2D_MESSAGE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.example.google.cloud.messaging.permission.C2D_MESSAGE" />
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name="com.google.android.gcm.GCMBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND" >
            <intent-filter>
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

                <category android:name="com.example.google.cloud.messaging" />
            </intent-filter>
        </receiver>

        <service android:name="com.example.google.cloud.messaging.GCMIntentService"  android:enabled="true"/>
    </application>

</manifest>

FIXED

I have create a new class called GCMIntentService:

public class GCMIntentService extends GCMBaseIntentService {

    @SuppressWarnings("hiding")
    private static final String TAG = "GCMIntentService";

    public GCMIntentService() {
        super("Test");
    }

    @Override
    protected void onRegistered(Context context, String registrationId) {
        Log.i(TAG, "Device registered: regId = " + registrationId);
    }

    @Override
    protected void onUnregistered(Context context, String registrationId) {
        Log.i(TAG, "Device unregistered");
    }

    @Override
    protected void onMessage(Context arg0, Intent arg1) {
      Log.d("GCM", "RECIEVED A MESSAGE");
      generateNotification(arg0, arg1.getStringExtra("message"));
       }

    @Override
    protected void onDeletedMessages(Context context, int total) {
        Log.i(TAG, "Received deleted messages notification");
    }

    @Override
    public void onError(Context context, String errorId) {
        Log.i(TAG, "Received error: " + errorId);
    }

    @Override
    protected boolean onRecoverableError(Context context, String errorId) {
        // log message
        Log.i(TAG, "Received recoverable error: " + errorId);
        return super.onRecoverableError(context, errorId);
    }

    /**
     * Issues a notification to inform the user that server has sent a message.
     */
    private static void generateNotification(Context context, String message) {
        int icon = R.drawable.ic_action_search;
        long when = System.currentTimeMillis();
        NotificationManager notificationManager = (NotificationManager)
                context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = new Notification(icon, message, when);
        String title = context.getString(R.string.app_name);
        Intent notificationIntent = new Intent(context, GCMIntentService.class);
        // set intent so it does not start a new activity
        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
                Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent intent =
                PendingIntent.getActivity(context, 0, notificationIntent, 0);
        notification.setLatestEventInfo(context, title, message, intent);
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notificationManager.notify(0, notification);
    }

}

Answer 1

You should have GCMIntentService in the client code and you should define it in the AndroidManifest.xml file as follows.

<service android:name=”package_name.GCMIntentService” />

Note that name of the intent service should be exactly same as GCMIntentService if you use GCMBroadcastReceiver. You can create your intent service if you implement your broadcast receiver.