notification通知栏

private void initBuilder(Context context, String title) {
        builder = new Notification.Builder(context)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(title);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            channel = new NotificationChannel(CHANNEL_ID,
                    MODE_UPLOADING,
                    NotificationManager.IMPORTANCE_LOW);
            channel.setSound(null, null); // 设置静音，否则会有声音
            builder.setChannelId(CHANNEL_ID); // 让通知归属于channel
            notificationManager.createNotificationChannel(channel);
        }
}

private void showNotification(int progress) {
        notificationManager.notify(notificationId, builder.build());
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