在处理批量通知/任务时，如果Android通知内容不更新，可以尝试以下解决方法：

1. 使用NotificationCompat.Builder的setGroup()方法和setGroupSummary()方法将通知分组，并创建一个组摘要通知，以显示有关所有通知的摘要信息。这样可以确保通知内容在批量处理时得到更新。

// 创建组摘要通知
NotificationCompat.Builder summaryNotificationBuilder = new NotificationCompat.Builder(context, channelId)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("Group Summary")
        .setContentText("You have multiple notifications")
        .setGroup(groupKey)
        .setGroupSummary(true);

// 添加具体通知到组中
NotificationCompat.Builder notificationBuilder1 = new NotificationCompat.Builder(context, channelId)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("Notification 1")
        .setContentText("This is notification 1")
        .setGroup(groupKey);

NotificationCompat.Builder notificationBuilder2 = new NotificationCompat.Builder(context, channelId)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("Notification 2")
        .setContentText("This is notification 2")
        .setGroup(groupKey);

// 显示组摘要通知和具体通知
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
notificationManager.notify(notificationId1, notificationBuilder1.build());
notificationManager.notify(notificationId2, notificationBuilder2.build());
notificationManager.notify(groupSummaryId, summaryNotificationBuilder.build());

2. 使用不同的通知ID来更新通知内容。确保每个通知都具有唯一的通知ID，并在更新通知内容时使用正确的ID。这样可以避免通知被覆盖而不更新内容。

// 更新通知内容
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, channelId)
        .setSmallIcon(R.drawable.notification_icon)
        .setContentTitle("Notification")
        .setContentText("This is a notification");

NotificationManagerCompat notificationManager = NotificationManagerCompat.from(context);
notificationManager.notify(notificationId, notificationBuilder.build());

请根据你的实际需求选择适合的解决方法。