Unity Android保存摄像头(Vuforia AR)拍照，载入UGUI image组件
发表于2018-07-30
为考虑pc/android/ios兼容性，另外也避免访问系统相册不同系统不一致的麻烦，我们采用application.persistentDataPath 来进行图像读写访问。
步骤一、保存图像
cameraTexture = new Texture2D(Screen.width, Screen.height, TextureFormat.ARGB32, false);
UnityEngine.Rect rect = new UnityEngine.Rect (0, 0, cameraTexture.width, cameraTexture.height);
cameraTexture.ReadPixels (rect, 0, 0, true);
cameraTexture.Apply ();
//把图片数据转换为byte数组
byte[] byt = cameraTexture.EncodeToPNG();
//然后保存为图片
System.DateTime now = System.DateTime.Now;
string timeStr = now.Year.ToString()+now.Month.ToString()+now.Day.ToString()+
now.Hour.ToString() + now.Minute.ToString() + now.Second.ToString();
File.WriteAllBytes(Application.persistentDataPath + "/CutImage.png", byt);
步骤二、读取图像
有两种方法，一种是SystemIO，一种是www方式，这里采用了SystemIO方式，
string filePath = Application.persistentDataPath + "/CutImage.png";
//创建文件读取流
FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
fileStream.Seek(0, SeekOrigin.Begin);
//创建文件长度缓冲区
byte[] bytes = new byte[fileStream.Length];
//读取文件
fileStream.Read(bytes, 0, (int)fileStream.Length);
//释放文件读取流
fileStream.Close();
fileStream.Dispose();
fileStream = null;
步骤三、将图像转成Texture2D，然后转成Sprite贴到Image组件上
//创建Texture
int width=800;
int height=640;
Texture2D texture = new Texture2D(width, height);
texture.LoadImage(bytes);
Sprite sprite = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0.5f, 0.5f));
Background.sprite = sprite;
收工，在PC，Android都确认通过。
来自：https://blog.csdn.net/zhh_panan/article/details/52445082