Android通知未显示

Question

伙计们我用这段代码来显示通知，但今天我尝试创建一个新的应用程序，并没有显示通知，我不知道发生了什么。从firebase发送通知，不显示通知。任何的想法 ？

在模拟器上它显示通知，而不是在我的三星A8（2018），我在其他应用程序中有相同的代码，它工作得很好。

  private void showSmallNotification( int icon, String title, String message, String timeStamp, PendingIntent resultPendingIntent, Uri alarmSound) {

        final NotificationCompat.Builder builder = new NotificationCompat.Builder(this, Constants.TOPIC_GLOBAL);

        NotificationCompat.InboxStyle inboxStyle = new NotificationCompat.InboxStyle();

        inboxStyle.addLine(message);

        Notification notification;
        notification = builder
                .setChannelId(Constants.TOPIC_GLOBAL)
                .setAutoCancel(true)
                .setContentTitle(title)
                .setContentIntent(resultPendingIntent)
                .setSound(alarmSound)
                .setStyle(inboxStyle)
                .setWhen(getTimeMilliSec(timeStamp))
                .setSmallIcon(R.mipmap.ic_launcher)
                .setLargeIcon(BitmapFactory.decodeResource(this.getResources(), icon))
                .setContentText(message)
                .build();

        NotificationManager notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(100, notification);
    }

Answer 1

 String CHANNEL_ID = "1";
    String CHANNEL_NAME = "Notification";

    Notification.Builder notification;

    if (Build.VERSION.SDK_INT >= 26) {
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
        channel.enableVibration(true);
        channel.setLightColor(Color.BLUE);
        channel.enableLights(true);
        channel.setSound(Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://" + getApplicationContext().getPackageName() + "/" + R.raw.trial),
                new AudioAttributes.Builder()
                        .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
                        .setUsage(AudioAttributes.USAGE_NOTIFICATION)
                        .build());
        channel.setLockscreenVisibility(Notification.VISIBILITY_SECRET);
        notificationManager.createNotificationChannel(channel);
        notification = new Notification.Builder(getApplicationContext(), CHANNEL_ID);
    } else {
        notification = new Notification.Builder(getApplicationContext());
        notification.setSound(Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://" + getPackageName() + "/" + R.raw.trial));
    }
    notification.setContentTitle(Title)
            .setVibrate(new long[]{0, 100})
            .setPriority(Notification.PRIORITY_MAX)
            .setContentText(ContentText)
            .setColor(ContextCompat.getColor(getApplicationContext(), R.color.green))
            .setLights(Color.RED, 3000, 3000)
            .setSmallIcon(R.drawable.ic_notifications_active_purple_24dp)
            .setContentIntent(pendingIntent)
            .setWhen(System.currentTimeMillis())
            .setAutoCancel(true);

    notificationManager.notify(CHANNEL_ID, 1, notification.build());

Answer 2

在Android 8.0及更高版本上发送通知之前，您必须通过将NotificationChannel实例传递给createNotificationChannel（）来向系统注册应用程序的通知通道。因此，以下代码被SDK_INT版本上的条件阻止：

private void createNotificationChannel() {
    // Create the NotificationChannel, but only on API 26+ because
    // the NotificationChannel class is new and not in the support library
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        CharSequence name = getString(R.string.channel_name);
        String description = getString(R.string.channel_description);
        int importance = NotificationManager.IMPORTANCE_DEFAULT;
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
        channel.setDescription(description);
        // Register the channel with the system; you can't change the importance
        // or other notification behaviors after this
        NotificationManager notificationManager = getSystemService(NotificationManager.class);
        notificationManager.createNotificationChannel(channel);
    }
}

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