如何在Unity Editor/Remote Rendering中启用Hololens 2系统键盘？

1. 检查MRTK输入配置 #

• 打开Project Settings > Mixed Reality Toolkit > Input，进入Input System Profile
• 找到Keyboard Settings模块：
  • 确保Enable Keyboard已勾选
  • 将Keyboard Type设置为System（Editor下会调用Windows系统虚拟键盘，Remote Rendering环境下适配远程输入）
  • 勾选Show Keyboard On Focus，让输入字段获得焦点时自动唤起键盘

2. 代码手动触发虚拟键盘 #

如果自动唤起逻辑不生效，可以通过代码强制调用MRTK的键盘服务：

using Microsoft.MixedReality.Toolkit;
using Microsoft.MixedReality.Toolkit.Input;
using TMPro;
using UnityEngine;

public class KeyboardHandler : MonoBehaviour
{
    [SerializeField] private TMP_InputField targetInputField;

    private void OnEnable()
    {
        if (targetInputField != null)
        {
            targetInputField.onSelect.AddListener(_ => OpenVirtualKeyboard());
        }
    }

    private void OnDisable()
    {
        if (targetInputField != null)
        {
            targetInputField.onSelect.RemoveListener(_ => OpenVirtualKeyboard());
        }
    }

    private void OpenVirtualKeyboard()
    {
        var keyboardService = CoreServices.InputSystem?.KeyboardService;
        if (keyboardService == null) return;

        keyboardService.ShowKeyboard(targetInputField.text, targetInputField.characterLimit, false);
        keyboardService.KeyboardTextSubmitted += UpdateInputFieldText;
        keyboardService.KeyboardHidden += CleanupKeyboardEvent;
    }

    private void UpdateInputFieldText(object sender, KeyboardTextEventArgs args)
    {
        targetInputField.text = args.Text;
    }

    private void CleanupKeyboardEvent(object sender, System.EventArgs args)
    {
        var keyboardService = CoreServices.InputSystem?.KeyboardService;
        if (keyboardService == null) return;

        keyboardService.KeyboardTextSubmitted -= UpdateInputFieldText;
        keyboardService.KeyboardHidden -= CleanupKeyboardEvent;
    }
}

• 将脚本挂载到包含TMP_InputField的GameObject上，指定targetInputField
• 输入字段获得焦点时，会自动唤起系统虚拟键盘（Editor下调用Windows系统键盘，Remote Rendering环境下适配远程输入通道）

3. Remote Rendering环境额外配置 #

如果使用Azure Remote Rendering：

• 确保ARR Session配置中勾选Enable Input，开启远程输入通道
• 检查MRTK的Input System Profile > Remote Input模块，确认已配置接收远程输入
• 上述代码的键盘调用逻辑会自动通过远程通道同步，在Editor端唤起本地虚拟键盘，或在Hololens端触发系统键盘

注意事项 #

• Unity Editor下，系统虚拟键盘依赖Windows的Touch Keyboard and Handwriting Panel Service，确保该服务未被禁用
• 旧版MRTK（v2.x）的配置路径略有差异，核心是找到Keyboard Settings并启用系统键盘选项

内容的提问来源于stack exchange，提问作者Alex