Android 学习手册

// 创建渠道
NotificationChannel channel = new NotificationChannel("channel_id", "Channel", NotificationManager.IMPORTANCE_DEFAULT);
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.createNotificationChannel(channel);

// 构建通知
Notification notification = new NotificationCompat.Builder(this, "channel_id")
        .setSmallIcon(R.drawable.ic_notification)
        .setContentTitle("Title")
        .setContentText("Content")
        .setAutoCancel(true)
        .build();

manager.notify(1, notification);