이미지를 저장하고 불러오기위해 저장후에 불러오기까진 했는데 이 이미지파일을 삭제하기위해선 소스상에서

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 public static void screen(Context context)
    {

        boolean isExternal = false;
        File picturesDirectory = context.getExternalFilesDir(mDirName);
        if (picturesDirectory != null)
        {
            cacheDir = picturesDirectory;
            if (!cacheDir.exists())
            {
                isExternal = cacheDir.mkdirs();
            }
            else
            {
//                MemoryManagement.deleteRecursiveOnlyFile(cacheDir);//삭제
                isExternal = true;
            }
        }

        if (!isExternal)
        {
            cacheDir = picturesDirectory;
            if (!cacheDir.exists())
            {
                cacheDir.mkdirs();
            }
            else
            {
                MemoryManagement.deleteRecursiveOnlyFile(cacheDir);
            }
        }

        FileDir = cacheDir + File.separator + mFileName;
        File imageDir = new File(FileDir);