如何在Android的状态栏中显示数字？

int notificationId = 1;  // 通知的唯一ID
String channelId = "my_channel_id";  // 通知渠道ID

NotificationCompat.Builder builder = new NotificationCompat.Builder(context, channelId)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("新消息")
        .setContentText("您有3条新消息")
        .setNumber(3)
        .setContentIntent(pendingIntent)  // 设置通知点击后的响应动作
        .setAutoCancel(true);  // 点击通知后自动取消通知

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

// 创建通知渠道（仅适用于Android 8.0及以上版本）
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    NotificationChannel channel = new NotificationChannel(channelId, "消息通知", NotificationManager.IMPORTANCE_DEFAULT);
    notificationManager.createNotificationChannel(channel);
}

notificationManager.notify(notificationId, builder.build());