unity 加载streamingAsset目录下的图片

可以通过以下代码实现：

using UnityEngine;
using UnityEngine.UI;

public class LoadImageFromStreamingAssets : MonoBehaviour
{
    public string imageName;

    void Start()
    {
        StartCoroutine(LoadImage());
    }

    IEnumerator LoadImage()
    {
        string imagePath = Application.streamingAssetsPath + "/" + imageName;
        Texture2D tex;

#if UNITY_ANDROID && !UNITY_EDITOR
        WWW www = new WWW(imagePath);
        yield return www;
        tex = www.texture;
#else
        byte[] fileData = System.IO.File.ReadAllBytes(imagePath);
        tex = new Texture2D(2, 2);
        tex.LoadImage(fileData);
#endif

        GetComponent<Image>().sprite = Sprite.Create(tex, new Rect(0, 0, tex.width, tex.height), new Vector2(0.5f, 0.5f));
    }
}