Unityの話～Android：画像ファイルの保存、存在確認、削除～

仕事で調査したので、メモ。

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

public class ScreenShotAndFileAccess : MonoBehaviour {
    
    [SerializeField]Image TestImage;
    [SerializeField]Text DebugText;

    private Texture2D TakeTexture;
    
    private readonly string SaveFileName = "Save1.png";

    public void OnClickTakeScreenShotButton() {
        StartCoroutine(CoTakeScreenShot());
    }

    IEnumerator CoTakeScreenShot() {
        // http://robamemo.hatenablog.com/entry/2017/09/13/111843
        // レンダリングがすべて終わった後に再開という事らしい
        yield return new WaitForEndOfFrame();

        Debug.Log(string.Format("w/h:{0}/{1}", Screen.width, Screen.height));
        TakeTexture = new Texture2D(Screen.width, Screen.height);
        TakeTexture.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
        TakeTexture.Apply();
    }
    
    public void OnClickSetImageButton() {
        Sprite sprite = Sprite.Create(TakeTexture, new Rect(0, 0, Screen.width, Screen.height), Vector2.zero);
        TestImage.sprite = sprite;
    }
    
    public void OnClickRemoveButton() {
        string filePathAndName = Application.persistentDataPath + "/" + SaveFileName;
        try {
            System.IO.File.Delete(filePathAndName);
        } catch (Exception e) {
            Debug.Log(e.ToString());
            UpdateDebugText(e.ToString());
        }
    }
    
    public void OnClickCheckExistButton() {
        string filePathAndName = Application.persistentDataPath + "/" + SaveFileName;
        if (System.IO.File.Exists(filePathAndName)) {
            Debug.Log("存在する");
            UpdateDebugText("存在する");
        } else {
            Debug.Log("存在しない");
            UpdateDebugText("存在しない");
        }
    }
    
    public void OnClickSaveButton() {
        string filePathAndName = Application.persistentDataPath + "/" + SaveFileName;
        var png = TakeTexture.EncodeToPNG();
        try {
            System.IO.File.WriteAllBytes( filePathAndName, png );
        } catch (Exception e) {
            Debug.Log(e.ToString());
            UpdateDebugText(e.ToString());
        }
    }
    
    private void UpdateDebugText(string text) {
        DebugText.text += text + "\n";
    }
}

github.com

ScreenShotAndFileAccessシーンで確認可能。