[游戏开发]Unity读取项目文件夹图片，PC端

1.创建场景，添加UI——Canvas，Canvas下添加Scroll View。

如下图

2.在Scroll View下的Content下添加脚本Open,添加Grid Layout Group。

3.Open的脚本如下，本地图片的路径如下

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
using UnityEngine.UI;

public class Open : MonoBehaviour
{
    private GameObject canvas;
    private Button _btn;
    private GameObject button;


    private List<Texture2D> images = new List<Texture2D>();

    void Start()
    {
        Debug.Log("开始");
        canvas = GameObject.Find("Canvas/Scroll View/Viewport/Content");


        load();
        Debug.Log("开始");

        for (int i = 0; i < images.Count; i++)
        {
            button = new GameObject("Button" + i, typeof(Button), typeof(RectTransform), typeof(Image));  //创建一个GameObject 加入Button组件

            button.transform.SetParent(this.canvas.transform);  //把Canvas设置成Button的父物体

            _btn = button.GetComponent<Button>();   //获得Button的Button组件

            //先创建一个Texture2D对象，用于把流数据转成Texture2D
            Sprite sprite = Sprite.Create(images[i], new Rect(0, 0, images[i].width, images[i].height), Vector2.zero);

            button.GetComponent<Image>().sprite = sprite;

            

        }

    }

    /// <summary>
    /// 加载文件夹内图片
    /// </summary>
    void load()
    {
        List<string> filePaths = new List<string>();

        string imgtype = "*.BMP|*.JPG|*.GIF|*.PNG";
        string[] ImageType = imgtype.Split('|');

        for (int i = 0; i < ImageType.Length; i++)
        {
            //获取Application.dataPath文件夹下所有的图片路径  
            string[] dirs = Directory.GetFiles((Application.dataPath + "/Image/"), ImageType[i]);



            for (int j = 0; j < dirs.Length; j++)
            {
                filePaths.Add(dirs[j]);
                Debug.Log(dirs[j]);

            }
        }

        for (int i = 0; i < filePaths.Count; i++)
        {
            Texture2D tx = new Texture2D(100, 100);
            tx.LoadImage(getImageByte(filePaths[i]));
            images.Add(tx);
        }
    }

    /// <summary>  
    /// 根据图片路径返回图片的字节流byte[]  
    /// </summary>  
    /// <param name="imagePath">图片路径</param>  
    /// <returns>返回的字节流</returns>  
    private static byte[] getImageByte(string imagePath)
    {
        FileStream files = new FileStream(imagePath, FileMode.Open);
        byte[] imgByte = new byte[files.Length];
        files.Read(imgByte, 0, imgByte.Length);
        files.Close();
        return imgByte;
    }




}

4.运行结果如下。

方法二

1.Canvas上添加Button和RawImage控件。

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2.新建一个空的GameObject，其上添加脚本。脚本如下：

using System;
using System.IO;
using UnityEngine;
using UnityEngine.UI;

public class LoadImageByString : MonoBehaviour
{
   
    public RawImage showImage;
    public Button loadImage;

    private string imgPath;
    private string imageStr;

    private void Awake()
    {
        Debug.Log("醒了");
        imgPath = Application.dataPath + "/Image/girl.jpg";
        Debug.Log(imgPath);

        imageStr = SetImageToString(imgPath);
    }

    void Start()
    {
        Debug.Log("开始");
         loadImage.onClick.AddListener(() =>
         {
                 showImage.texture = GetTextureByString(imageStr);

          });
    }

    /// <summary>
    /// 将图片转化为字符串
    /// </summary>
    private string SetImageToString(string imgPath)
    {
        Debug.Log("将图片转化为字符串");
        FileStream fs = new FileStream(imgPath, FileMode.Open);
        byte[] imgByte = new byte[fs.Length];
        fs.Read(imgByte, 0, imgByte.Length);
        fs.Close();
        return Convert.ToBase64String(imgByte);
    }

    /// <summary>
    /// 将字符串转换为纹理
    /// </summary>
    private Texture2D GetTextureByString(string textureStr)
    {
        Debug.Log("将字符串转换为纹理");
        Texture2D tex = new Texture2D(10, 10);
        byte[] arr = Convert.FromBase64String(textureStr);
        tex.LoadImage(arr);
        tex.Apply();
        return tex;
    }

    public void onclick()
    {
        Debug.Log("按下了");
       
    }
}

3.运行，点击按钮，读取一张图片显示。

问题：打包成为apk，安卓手机端运行读取不到图片，asset的资源没有被打包到apk，问题应该在Application.dataPath。尝试其他的也没有成功，需要再查一下。

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参考(24条消息) Unity读取图片并显示到UI中_FutureDr的博客-CSDN博客