GCM客户端未接收消息

Question

我的GCM客户端未收到任何类型的通知。我能够在后端注册令牌。我已经仔细检查了我的Sender id＆amp;我通过注册google api获得的api密钥。客户端从不接收任何GCM消息。我无法弄清楚背后的核心原因

public class MessageListener extends GcmListenerService {

/**
 * Called when message is received.
 *
 * @param from SenderID of the sender.
 * @param data Data bundle containing message data as key/value pairs.
 *             For Set of keys use data.keySet().
 */
@Override
public void onMessageReceived(String from, Bundle data) {
    super.onMessageReceived(from, data);
    Log.d("AGCM", "Message from ::" + from + " Bundle ::" + data.toString());
}}

清单：

<application
    android:name=".AGCMApplicationClass"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

    <service
        android:name=".GCMInitializationService"
        android:exported="false" >
    </service>

    <!-- Meta data required for Google Play Services -->
    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />

    <!-- GCM components start -->
    <receiver
        android:name="com.google.android.gms.gcm.GcmReceiver"
        android:exported="true"
        android:permission="com.google.android.c2dm.permission.SEND" >
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
        </intent-filter>
    </receiver>

    <service
        android:name="com.example.agcm.MessageListener"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.android.c2dm.intent.RECEIVE" />
        </intent-filter>
    </service>

    <service
        android:name="com.example.agcm.gcm.InstanceIDChangeListenerService"
        android:exported="false" >
        <intent-filter>
            <action android:name="com.google.android.gms.iid.InstanceID" />
        </intent-filter>
    </service>
    <service
        android:name="com.example.agcm.gcm.GCMIntentService"
        android:enabled="true" >
    </service>
    <receiver android:name="com.example.agcm.gcmdownload.GCMAppInstallReceiver"></receiver>
    <!-- GCM components end -->
</application>

获取令牌代码段：

if (GCMUtils.checkGooglePlaySevices(getApplicationContext(), mRegistrationCallbacks)) {
                    InstanceID instanceID = InstanceID.getInstance(context);
                    registrationToken = instanceID.getToken(senderID,
                            GoogleCloudMessaging.INSTANCE_ID_SCOPE, null);
                    sendRegistrationIdToBackend(registrationToken, context,urlToHit,appPackage);
                }

永远不会调用消息侦听器。