Unity：使用TextureManager在安卓读取本地图片或截屏存入本地

首先介绍下Application.persistentDataPath，这个是返回Andrio客户端专门为APP保存素材的文件夹，在PC会保存到C盘文件夹下，PC可以使用Application.dataPath保存到根目录

C#单例类，不需要挂载到场景，一共有三个方法

Texture ReadTexture(string path)  读取素材文件夹下的参数一的图片文件转换成Texture类型返回值(RawImage使用)

PrintCameraAndSave(Camera camera,string path)   截取相机的内容并保存到素材文件夹下

Texture PrintCamera(Camera camera)  截取相机的内容并作为Texture类型返回值返回

除此之外更新了很多方法，不过都大同小异。

下面是代码：

using System;
using UnityEngine;
using System.IO;
 
public class TextureManager
{
    private static TextureManager main;
 
    public static TextureManager Main
    {
        get
        {
            if (main == null)
            {
                main = new TextureManager();
            }
 
            return main;
        }
    }

//    private string texturePath = Application.dataPath;
    private string texturePath = Application.persistentDataPath;




    public string Path
    {
        get { return texturePath; }
    }

    public string GetTexturePath(string path)
    {
        return texturePath + "/" + path + ".png";
    }

    public void DeleteTexture(string path)
    {
        File.Delete(texturePath + "/" + path + ".png");
    }

    public Texture2D ReadTexture(string path)
    {
        FileStream stream;
        try
        {
            stream = new FileStream(texturePath + "/" + path + ".png",FileMode.Open,FileAccess.ReadWrite);
        }
        catch
        {
            Debug.LogError(path + ",地址下没有图片");
            return null;
        }
        byte[] bb = new byte[stream.Length];
        stream.Read(bb, 0, bb.Length);
        Texture2D t = new Texture2D(1,1);
        t.LoadImage(bb);
        stream.Close();
        return t;
    }

    public byte[] ByteRead(string path)
    {
        FileStream stream = new FileStream(texturePath + "/" + path + ".png",FileMode.OpenOrCreate,FileAccess.ReadWrite);
        byte[] bb = new byte[stream.Length];
        stream.Read(bb, 0, bb.Length);
        stream.Close();
        return bb;
    }

    public void SaveTexture2D(byte[] bb,string path)
    {
        FileStream stream = new FileStream(texturePath + "/" + path + ".png",FileMode.OpenOrCreate,FileAccess.ReadWrite);
        stream.Write(bb, 0, bb.Length);
        stream.Close();
    }

    public void PrintCameraAndSave(Camera camera,string path)
    {
        bool randerCamera = camera.targetTexture != null;
        RenderTexture render = GetRander(camera);
        if(!randerCamera){camera.targetTexture = render;}
        camera.Render();
        RenderTexture.active = render;
        Texture2D t = new Texture2D(render.width,render.height);
        t.ReadPixels(new Rect(0,0,render.width,render.height),0,0);
        t.Apply();
        if(!randerCamera){camera.targetTexture = null;}
        RenderTexture.active = null;
        FileStream stream = new FileStream(texturePath + "/" + path + ".png",FileMode.OpenOrCreate,FileAccess.ReadWrite);
        byte[] bb = t.EncodeToPNG();
        stream.Write(bb, 0, bb.Length);
        stream.Close();
    }
 
    public Texture2D PrintCamera(Camera camera)
    {
        bool randerCamera = camera.targetTexture != null;
        RenderTexture render = GetRander(camera);
        if(!randerCamera){camera.targetTexture = render;}
        camera.Render();
        RenderTexture.active = render;
        Texture2D t = new Texture2D(render.width,render.height);
        t.ReadPixels(new Rect(0,0,render.width,render.height),0,0);
        t.Apply();
        if(!randerCamera){camera.targetTexture = null;}
        RenderTexture.active = null;
        return t;
    }
    
    public byte[] PrintCameraReturnByte(Camera camera)
    {
        bool randerCamera = camera.targetTexture != null;
        RenderTexture render = GetRander(camera);
        if(!randerCamera){camera.targetTexture = render;}
        camera.Render();
        RenderTexture.active = render;
        Texture2D t = new Texture2D(render.width,render.height);
        t.ReadPixels(new Rect(0,0,render.width,render.height),0,0);
        t.Apply();
        if(!randerCamera){camera.targetTexture = null;}
        RenderTexture.active = null;
        return t.EncodeToPNG();
    }



    public void SaveTexture(Texture2D texture,string path)
    {
        FileStream stream = new FileStream(texturePath + "/" + path + ".png",FileMode.OpenOrCreate,FileAccess.ReadWrite);
        byte[] bb = texture.EncodeToPNG();
        stream.Write(bb, 0, bb.Length);
        stream.Close();
    }

    public Texture2D PrintCameraSaveAndReturn(Camera camera,string path)
    {
        bool randerCamera = camera.targetTexture != null;
        RenderTexture render = GetRander(camera);
        if(!randerCamera){camera.targetTexture = render;}
        camera.Render();
        RenderTexture.active = render;
        Texture2D t = new Texture2D(render.width,render.height);
        t.ReadPixels(new Rect(0,0,render.width,render.height),0,0);
        t.Apply();
        if(!randerCamera){camera.targetTexture = null;}
        RenderTexture.active = null;
        FileStream stream = new FileStream(texturePath + "/" + path + ".png",FileMode.OpenOrCreate,FileAccess.ReadWrite);
        byte[] bb = t.EncodeToPNG();
        stream.Write(bb, 0, bb.Length);
        stream.Close();
        return t;
    }

    private RenderTexture GetRander(Camera camera)
    {
        RenderTexture render;
        if (camera.targetTexture != null)
        {
            render = camera.targetTexture;
        }
        else
        {
            render = Resources.Load<RenderTexture>("RenderTexture");
            if (render == null)
            {
                render = new RenderTexture(Screen.width,Screen.height,0);
            }
        }
        return render;
    }


}