Question

我正在按照本教程进行操作，并且正在使用FCM发送推送通知，但是由于某些原因，该代码似乎无法正常工作。在onMessageRecieved（）中，im会构建通知，使电话振动并显示通知，并且由于某种原因电话会振动，但未显示通知。这是代码：

Intent intent=new Intent(this, WelcomeActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            PendingIntent pendingIntent=PendingIntent.getActivity(this
                    ,0
                    ,intent
                    ,PendingIntent.FLAG_ONE_SHOT);
            NotificationCompat.Builder notificationBuilder=new NotificationCompat.Builder(this);
            notificationBuilder.setContentTitle(getString(R.string.app_name));
            notificationBuilder.setContentText(message);
            Uri soundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            notificationBuilder.setSound(soundUri);
            notificationBuilder.setSmallIcon(R.mipmap.ic_launcher);
            notificationBuilder.setLargeIcon(BitmapFactory.decodeResource(this.getResources(),R.mipmap.ic_launcher));
            notificationBuilder.setAutoCancel(true);
            Vibrator v=(Vibrator) this.getSystemService(Context.VIBRATOR_SERVICE);
            v.vibrate(1000);
            notificationBuilder.setContentIntent(pendingIntent);
            NotificationManager notificationManager=(NotificationManager)
                    getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.notify(0,notificationBuilder.build());

如果有人可以告诉我怎么了，那太好了..谢谢：）

Answer 1

根据您的代码以及未显示通知的事实，我假设您正在使用Android 8.0以上版本的设备进行测试。

对于Android 8.0（Oreo）或更高版本，您需要使用通知通道，才能显示通知。有关更多详细信息，请参见this link。

Answer 2

对于Android 8及更高版本，请使用如下所示的通知频道

Intent intent=new Intent(this, WelcomeActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            PendingIntent pendingIntent=PendingIntent.getActivity(this
                    ,0
                    ,intent
                    ,PendingIntent.FLAG_ONE_SHOT);
            NotificationCompat.Builder notificationBuilder=new NotificationCompat.Builder(this);
            notificationBuilder.setContentTitle(getString(R.string.app_name));
            notificationBuilder.setContentText(message);
            Uri soundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            notificationBuilder.setSound(soundUri);
            notificationBuilder.setSmallIcon(R.mipmap.ic_launcher);
            notificationBuilder.setLargeIcon(BitmapFactory.decodeResource(this.getResources(),R.mipmap.ic_launcher));
            notificationBuilder.setAutoCancel(true);
            Vibrator v=(Vibrator) this.getSystemService(Context.VIBRATOR_SERVICE);
            v.vibrate(1000);
            notificationBuilder.setContentIntent(pendingIntent);

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

        // Since android Oreo notification channel is needed.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
           /* NotificationChannel channel = new NotificationChannel(channelId,
                    "Membership Alerts",
                    NotificationManager.IMPORTANCE_DEFAULT);
            notificationManager.createNotificationChannel(channel);*/

            CharSequence name = getString(R.string.notification_channel_name);
            String description = getString(R.string.notification_channel_description);
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(channelId, name, importance);
            channel.setDescription(description);
            notificationManager.createNotificationChannel(channel);
        }

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

onMessageRecieved（）被调用，执行其代码但不显示通知

2 个答案: