OneSignal - 收到推送通知后出错

Question

基于this guide，我尝试将我现有的Android 应用程序与OneSignal 集成。我将OneSignal 代码放在 MainActivity.java 中：

protected void onCreate(Bundle pSavedInstanceState) 
{

OneSignal.startInit(this)
.setNotificationOpenedHandler(new OneSignalNotificationOpenedHandler())
.setNotificationReceivedHandler(new OneSignalReceivedHandler())
.init();        

}  

当然，我已经为.setNotificationOpenedHandler 和.setNotificationReceivedHandler 创建了类处理程序 类处理程序区域（在 MainActivity.java 中）：

private class OneSignalReceivedHandler implements OneSignal.NotificationReceivedHandler
{
    @Override
    public void notificationReceived(OSNotification notification) {
        JSONObject data = notification.payload.additionalData;
        String customKey;

        Log.d("onesignal=","onesignal receiver");
        if (data != null) {
            customKey = data.optString("customkey", null);
            if (customKey != null)
                Log.i("OneSignalExample", "customkey set with value: " + customKey);
        }
    }
}

private class OneSignalNotificationOpenedHandler implements OneSignal.NotificationOpenedHandler
{

    @Override
    public void notificationOpened(OSNotificationOpenResult result) {
        OSNotificationAction.ActionType actionType = result.action.type;
        JSONObject data = result.notification.payload.additionalData;
        String customKey;

        Log.d("onesignal=","onesignal open handler");

        if (data != null) {
            customKey = data.optString("customkey", null);
            if (customKey != null)
                Log.i("OneSignalExample", "customkey set with value: " + customKey);
        }

        if (actionType == OSNotificationAction.ActionType.ActionTaken)
            Log.i("OneSignalExample", "Button pressed with id: " + result.action.actionID);
    }
}

但在收到推送通知后，我的应用程序突然关闭并显示错误：java.lang.NullPointerException: Attempt to invoke virtual method

收到推送通知后的错误：

致命异常：pool-13-thread-1 进程：com.myapps，PID：24189 java.lang.NullPointerException：尝试调用虚拟方法 'java.lang.String com.google.firebase.messaging.RemoteMessage$Notification.getBody()' 开启 空对象引用 com.mylib.FCMMessageReceiverService.onMessageReceived(FCMMessageReceiverService.java:26) 在 com.google.firebase.messaging.FirebaseMessagingService.zzo（未知 来源）在 com.google.firebase.messaging.FirebaseMessagingService.zzn（未知 来源）在 com.google.firebase.messaging.FirebaseMessagingService.zzm（未知 来源）在 com.google.firebase.iid.zzb$2.run（未知来源）在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 在 java.lang.Thread.run(Thread.java:818)

有什么想法吗？

非常感谢...

===更新

我的 MyFirebaseMessagingService.java 类：

public class MyFirebaseMessagingService extends com.google.firebase.messaging.FirebaseMessagingService {

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        //super.onMessageReceived(remoteMessage);
        Intent intent = new Intent(this, GameActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_ONE_SHOT);
        NotificationCompat.Builder notifictionBuilder = new NotificationCompat.Builder(this);
        notifictionBuilder.setContentTitle("My Application");

        notifictionBuilder.setContentText(remoteMessage.getNotification().getBody());

        notifictionBuilder.setAutoCancel(true);
        notifictionBuilder.setSmallIcon(R.drawable.ic_launcher);
        notifictionBuilder.setContentIntent(pendingIntent);
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(0,notifictionBuilder.build());
    }
}

Answer 1

正如错误提示，

java.lang.NullPointerException：尝试调用虚拟方法 'java.lang.String com.google.firebase.messaging.RemoteMessage$Notification.getBody()' 开启 一个空对象引用在

检查名为

的文件

MyFirebaseMessagingService

在其中你将拥有这个功能

public class MyFirebaseMessagingService  extends FirebaseMessagingService {

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {

    Log.d(TAG, "From: " + remoteMessage.getFrom());
    Log.d(TAG, "Notification Message Body: " + remoteMessage.getNotification().getBody());

    sendNotification(remoteMessage.getNotification().getBody());
} 

在您的 $message 上添加一个通知对象。您的 POST 请求的正文必须类似于：

{
    "to" : "aUniqueKey",
    "notification" : {
      "body" : "Blah Blah!",
      "title" : "Hey vs. Hello"
    },
    "data" : {
      "Nick" : "Amigos",
      "Room" : "Lasta vs Avista"
    }
}

您的remoteMessage.getNotification() 返回null，因为您的 POST 请求正文不包含通知对象。