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⭐Unity 安卓环境中正确地读取和处理 XML 文件

news 来源：原创 2024/9/22 3:37:55

写了一个选择题Demo，电脑包和编辑器内无问题，但是打包安卓手机之后题目无法正常使用，想到的是安卓环境中正确地读取文件的问题

改进方案：

1.由于 XmlDocument.Load 方法在 Android 上的路径问题（由于文件位于 APK 内部，无法像在文件系统中那样直接访问），需要先使用 UnityWebRequest 来异步加载文件内容，然后再解析 XML。

2.异步处理：修改你的代码，以支持异步文件加载和处理，这对于避免在加载大文件时造成的界面冻结也很有帮助。

代码对比：

初版：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using System.Xml;
using System.Text;public class xmlres : MonoBehaviour
{[SerializeField]private List<Toggle> toggleList;//答案ABC[SerializeField]private Text TM_Text;//题目[SerializeField]private List<Text> DA_TextList;//选项private int topNumber = 0;private string selectAnswer = " ";private bool isSelect = false;//是否选中/* 确定五道题    */List<xmlData> xmls = new List<xmlData>();List<xmlData> useArray = new List<xmlData>();HashSet<xmlData> xmlDatas = new HashSet<xmlData>();//public GameObject selectPanel;//public GameObject wrongPanel;public static xmlres instance;private void Awake(){instance = this;}void Start(){ReadQuestion();toggleList[0].onValueChanged.AddListener(OnValChanged0);toggleList[1].onValueChanged.AddListener(OnValChanged1);toggleList[2].onValueChanged.AddListener(OnValChanged2);}void OnValChanged0(bool check){//Debug.Log(check);if (check){selectAnswer = "A";isSelect = true;}}void OnValChanged1(bool check){//Debug.Log(check);if (check){selectAnswer = "B";isSelect = true;}}void OnValChanged2(bool check){//Debug.Log(check);if (check){selectAnswer = "C";isSelect = true;}}public void ReadQuestion(){string url = Application.streamingAssetsPath + "/myxml.xml";XmlDocument XmlDoc = new XmlDocument();XmlDoc.Load(url);//获取所有题目int XmlCount = XmlDoc.GetElementsByTagName("Timu").Count;Debug.Log(XmlCount);//解析每一个题目for (int i = 0; i < XmlCount; i++){xmlData temp = new xmlData();XmlNodeList ls = XmlDoc.GetElementsByTagName("Timu")[i].ChildNodes;temp.key = ls[0].InnerText;temp.title = ls[1].InnerText;temp.q1 = ls[2].InnerText;temp.q2 = ls[3].InnerText;temp.q3 = ls[4].InnerText;temp.answer = ls[5].InnerText;//存储到题库xmls.Add(temp);}GetFiveQuestions();//foreach (var item in useArray)//{//    Debug.Log(item);//}}//判断问题是否正确public bool PanDuan(int topNumber, string answer){foreach (var item in useArray){if (useArray[topNumber].answer == answer){//Debug.Log("zhengque");return true;}else{//Debug.Log("cuowu");return false;}}return false;}/// <summary>/// 得到五道题/// </summary>public void GetFiveQuestions(){for (int i = 0; i < 5; i++){A1: int index = Random.Range(0, 15);if (xmlDatas.Add(xmls[index])){useArray.Add(xmls[index]);}else{goto A1;}}ResetTimu(topNumber);}/// <summary>/// 初始化题目/// </summary>/// <param name="index"></param>public void ResetTimu(int index){for (int i = 0; i < toggleList.Count; i++){toggleList[i].isOn = false;}for (int i = 0; i < DA_TextList.Count; i++){TM_Text.text = useArray[index].title;switch (i){case 0:DA_TextList[i].text = useArray[index].q1;break;case 1:DA_TextList[i].text = useArray[index].q2;break;case 2:DA_TextList[i].text = useArray[index].q3;break;}}}/// <summary>/// 确定之后进入下一题/// </summary>public void BtnClick(){//print(isSelect);if (topNumber == 4){Debug.Log("答完了");}if (isSelect == true){if (topNumber < 5){if (PanDuan(topNumber, selectAnswer)){topNumber++;if (topNumber<5){ResetTimu(topNumber);}isSelect = false;print("选择正确");}else{topNumber++;if (topNumber < 5){ResetTimu(topNumber);}isSelect = false;print("选择错误");}}else{return;}}else{return;}}}

改进版:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Networking;
using System.Xml;public class xmlres : MonoBehaviour
{[SerializeField]private List<Toggle> toggleList; // 答案ABC[SerializeField]private Text TM_Text; // 题目[SerializeField]private List<Text> DA_TextList; // 选项private int topNumber = 0;private string selectAnswer = " ";private bool isSelect = false; // 是否选中List<xmlData> xmls = new List<xmlData>();List<xmlData> useArray = new List<xmlData>();HashSet<xmlData> xmlDatas = new HashSet<xmlData>();public static xmlres instance;private void Awake(){instance = this;}void Start(){StartCoroutine(ReadQuestion());toggleList[0].onValueChanged.AddListener(OnValChanged0);toggleList[1].onValueChanged.AddListener(OnValChanged1);toggleList[2].onValueChanged.AddListener(OnValChanged2);}IEnumerator ReadQuestion(){string url = Path.Combine(Application.streamingAssetsPath, "myxml.xml");UnityWebRequest www = UnityWebRequest.Get(url);yield return www.SendWebRequest();if (www.isNetworkError || www.isHttpError){Debug.Log(www.error);}else{XmlDocument xmlDoc = new XmlDocument();xmlDoc.LoadXml(www.downloadHandler.text);int XmlCount = xmlDoc.GetElementsByTagName("Timu").Count;Debug.Log(XmlCount);for (int i = 0; i < XmlCount; i++){xmlData temp = new xmlData();XmlNodeList ls = xmlDoc.GetElementsByTagName("Timu")[i].ChildNodes;temp.key = ls[0].InnerText;temp.title = ls[1].InnerText;temp.q1 = ls[2].InnerText;temp.q2 = ls[3].InnerText;temp.q3 = ls[4].InnerText;temp.answer = ls[5].InnerText;xmls.Add(temp);}GetFiveQuestions();}}void OnValChanged0(bool check){if (check){selectAnswer = "A";isSelect = true;}}void OnValChanged1(bool check){if (check){selectAnswer = "B";isSelect = true;}}void OnValChanged2(bool check){if (check){selectAnswer = "C";isSelect = true;}}public bool PanDuan(int topNumber, string answer){if (useArray[topNumber].answer == answer){return true;}else{return false;}}public void GetFiveQuestions(){xmlDatas.Clear();useArray.Clear();while (useArray.Count < 5){int index = Random.Range(0, xmls.Count);if (xmlDatas.Add(xmls[index])){useArray.Add(xmls[index]);}}ResetTimu(topNumber);}public void ResetTimu(int index){TM_Text.text = useArray[index].title;DA_TextList[0].text = useArray[index].q1;DA_TextList[1].text = useArray[index].q2;DA_TextList[2].text = useArray[index].q3;foreach (var toggle in toggleList){toggle.isOn = false;}}public void BtnClick(){if (isSelect){bool correct = PanDuan(topNumber, selectAnswer);if (correct){Debug.Log("选择正确");}else{Debug.Log("选择错误");}topNumber++;if (topNumber < 5){ResetTimu(topNumber);}else{Debug.Log("答完了");}isSelect = false;}}
}public class xmlData
{public string key;public string title;public string q1;public string q2;public string q3;public string answer;
}