Android 导航栏中未显示PubNub GCM推送导航

我正在开发一个使用PubNub和BackEnding的Android即时聊天应用程序。当用户收到新的聊天信息时，我正在向他们发送推送通知。我成功地集成了PubNub和GCM。因此，我可以使用这两种服务向设备发送通知。我按照本教程完成了这项工作

但即使通知消息正在发送，它也不会作为推送通知显示在手机的通知栏中。消息以提示音发送到设备。但没有消息显示为通知栏。谁能帮我解决这个问题。这是到目前为止我的代码

这是我的AndroidManifest文件

<permission android:name="your.package.name.permission.C2D_MESSAGE"
    android:protectionLevel="signature" />
<uses-permission android:name="your.package.name.permission.C2D_MESSAGE" />

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

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

<!--<receiver
    android:name="your.package.name.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="your.package.name" />
    </intent-filter>
</receiver>-->
    <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" />
            <category android:name="your.package.name" />
        </intent-filter>
    </receiver>
<!-- [START gcm_listener] -->
<service
    android:name="your.package.name.MyGcmListenerService"
    android:exported="false" >
    <intent-filter>
        <action android:name="com.google.android.c2dm.intent.RECEIVE" />
    </intent-filter>
</service>
<!-- [END gcm_listener] -->
<!-- [START instanceId_listener] -->
<service
    android:name="your.package.name.MyInstanceIDListenerService"
    android:exported="false">
    <intent-filter>
        <action android:name="com.google.android.gms.iid.InstanceID"/>
    </intent-filter>
</service>
<!-- [END instanceId_listener] -->
<service
    android:name="your.package.name.RegistrationIntentService"
    android:exported="false">
</service>

</application>

这是GCMListenerService类

ublic class MyGcmListenerService extends GcmListenerService {

private static final String TAG = "MyGcmListenerService";
// [START receive_message]
@Override
public void onMessageReceived(String from, Bundle data) {
    String message = data.getString("message");
    Log.d(TAG, "From: " + from);
    Log.d(TAG, "Message: " + message);

    if (from.startsWith("/topics/")) {
        // message received from some topic.
    } else {
        // normal downstream message.
    }
}
/**
 * Create and show a simple notification containing the received GCM message.
 *
 * @param message GCM message received.
 */
private void sendNotification(String message) {
    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
            PendingIntent.FLAG_ONE_SHOT);

    Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            //.setSmallIcon(R.drawable.ic_stat_ic_notification)
            .setContentTitle("GCM Message")
            .setContentText(message)
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent)
            .setStyle(new NotificationCompat.BigTextStyle().bigText(message));

    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());

谁能告诉我这个实现有什么问题吗。如果你愿意，我可以给你更多的代码

---

提前感谢

我在定义sendNortification方法时发现了错误。我已经注释掉了

NotificationCompact

中的.code>setSmallIcon属性，它是必需的通知内容

谢谢

ublic class MyGcmListenerService extends GcmListenerService {

private static final String TAG = "MyGcmListenerService";
// [START receive_message]
@Override
public void onMessageReceived(String from, Bundle data) {
    String message = data.getString("message");
    Log.d(TAG, "From: " + from);
    Log.d(TAG, "Message: " + message);

    if (from.startsWith("/topics/")) {
        // message received from some topic.
    } else {
        // normal downstream message.
    }
}
/**
 * Create and show a simple notification containing the received GCM message.
 *
 * @param message GCM message received.
 */
private void sendNotification(String message) {
    Intent intent = new Intent(this, MainActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
            PendingIntent.FLAG_ONE_SHOT);

    Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            //.setSmallIcon(R.drawable.ic_stat_ic_notification)
            .setContentTitle("GCM Message")
            .setContentText(message)
            .setAutoCancel(true)
            .setSound(defaultSoundUri)
            .setContentIntent(pendingIntent)
            .setStyle(new NotificationCompat.BigTextStyle().bigText(message));

    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());