【Unity3D】实现Android截图功能

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

//脚本功能：截屏，截图带UI

public class ScreenShot : MonoBehaviour
{
    public void OnscreenShotClick()
    {
        //获取系统时间
        System.DateTime now = System.DateTime.Now;
        //时间转换成字符串来储存
        string times = now.ToString();
        times = times.Trim();
        times = times.Replace("/", "-");
        //命名图片名
        string fileName = "ARScreenShot" + times + ".png";
        //判断系统是否安卓平台
        if(Application.platform == RuntimePlatform.Android)
        {　　

            //截取屏幕，new一个贴图放截图
            Texture2D texture = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
            //读取贴图
            texture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0,0);
            texture.Apply();
            //贴图转换成字节数组
            byte[] bytes = texture.EncodeToPNG();
            //存放目录
            string destination = "/sdcard/DCIM/ScreenShots";
            //判断目录是否存在，不存在则创建
            if (!Directory.Exists(destination))
            {
                Directory.CreateDirectory(destination);
            }
            string pathSave = destination + "/" + fileName;
            //存图片
            File.WriteAllBytes(pathSave, bytes);
        }
    }
}

1. 脚本命名为ScreenShot
2. 把脚本挂到某个object上，如canvas
3. button按钮on click()添加，选择脚本OnscreenShotClick()函数；

（代码存档，以备不时之需）

不带UI的，在以上代码修改

代码如下

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

//脚本功能：截屏

public class ScreenShot : MonoBehaviour
{
    private Camera arCamera;

    // Start is called before the first frame update
    void Start()
    {
        arCamera = GameObject.Find("ARCamera").GetComponent();
    }

    // Update is called once per frame
    void Update()
    {
        
    }
    public void OnscreenShotClick()
    {
        //获取时间
        System.DateTime now = System.DateTime.Now;
        //时间转换成字符串来储存
        string times = now.ToString();
        times = times.Trim();
        times = times.Replace("/", "-");

        string fileName = "ARScreenShot" + times + ".png";

        if(Application.platform == RuntimePlatform.Android)
        {
            RenderTexture rt = new RenderTexture(Screen.width, Screen.height, 1);
            arCamera.targetTexture = rt;
            arCamera.Render();

            RenderTexture.active = rt;

            
            //new一个贴图放截图
            Texture2D texture = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
            //读取贴图
            texture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0,0);
            texture.Apply();

            arCamera.targetTexture = null;
            RenderTexture.active = null;
            Destroy(rt);

            //贴图转换成字节数组
            byte[] bytes = texture.EncodeToPNG();

            //
            string destination = "/sdcard/DCIM/ScreenShots";

            //
            if (!Directory.Exists(destination))
            {
                Directory.CreateDirectory(destination);

            }
            string pathSave = destination + "/" + fileName;
            File.WriteAllBytes(pathSave, bytes);

            

        }


    }
}