java.lang.IllegalArgumentException：无效的通知（没有有效的小图标）

Question

您好，有人可以建议我如何在不接收此异常的情况下进行通知：java.lang.IllegalArgumentException：无效的通知（没有有效的小图标）：Notification（channel = null pri = 0 contentView = null vibrate = null sound = null defaults = 0x0标志= 0x0颜色= 0x00000000 vis = PRIVATE）

代码：

public void notifyThis（String text）{

    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

    Intent notificationIntent = new Intent(this, RegisterActivity.class);
    PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
    if(Build.VERSION.SDK_INT >= 26) {
        //When sdk version is larger than26
        String id = "channel_1";
        String description = "143";
        int importance = NotificationManager.IMPORTANCE_LOW;
        NotificationChannel channel = new NotificationChannel(id, description, importance);
        channel.enableLights(true);
        channel.enableVibration(true);//
        manager.createNotificationChannel(channel);
        Notification notification = new Notification.Builder(MapsActivity.this, id)
                .setCategory(Notification.CATEGORY_MESSAGE)
                .setSmallIcon(R.drawable.ic_notification)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.screenmec))
                .setContentTitle("MECTS.SA")
                .setContentText(text)
                .setContentIntent(contentIntent)
                .setAutoCancel(true)
                .build();
        manager.notify(1, notification); }
    else {
        //When sdk version is less than26
        Notification notification = new NotificationCompat.Builder(MapsActivity.this)
                .setSmallIcon(R.drawable.ic_notification)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.screenmec))
                .setContentTitle("MECTS.SA")
                .setContentText(text)
                .setContentIntent(contentIntent)
                .build();
        manager.notify(1,notification); }
    NotificationManager mannager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    mannager.notify(0,builder.build());
}

Answer 1

您正在建立两个通知。另一个基于没有小图标或任何其他内容的空生成器：

NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

...

NotificationManager mannager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mannager.notify(0,builder.build());

您可以删除此代码。