在API 31（Android 12）上，如果您使用Notification.Builder.addAction（）添加操作按钮，则会导致通知不起作用。解决此问题的方法是使用另一种方式添加操作按钮，即使用RemoteInput.Builder添加RemoteInput。以下是示例代码：

RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_REPLY)
                .setLabel(replyLabel)
                .setChoices(choices)
                .setAllowFreeFormInput(true)
                .build();

Intent replyIntent = new Intent(this, MyBroadcastReceiver.class);
replyIntent.setAction(ACTION_REPLY);
replyIntent.putExtra(EXTRA_NOTIFICATION_ID, notificationId);
replyIntent.putExtra(EXTRA_CONVERSATION_ID, conversationId);
replyIntent.putExtra(EXTRA_REMOTE_INPUT, remoteInput);

PendingIntent replyPendingIntent =
        PendingIntent.getBroadcast(getApplicationContext(),
                conversationId,
                replyIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);

Notification.Action replyAction = new Notification.Action.Builder(
        R.drawable.ic_reply_white_18dp,
        replyLabel,
        replyPendingIntent)
        .addRemoteInput(remoteInput)
        .build();

在此示例代码中，我们使用RemoteInput.Builder并在操作按钮上设置RemoteInput。这样就可以在API 31（Android 12）上正常工作通知了。