从 Xamarin Android 文档中的字节数组创建图像文件

问题描述：

有人可以帮助我了解如何从 Xamarin Android 文档中的字节数组创建图像文件并获取图像的新路径吗?

Could anyone help me about how to create image file from byte array in documents Xamarin Android and get the new path for the image please ?

这是我的代码:

Stream stream = ContentResolver.OpenInputStream(data.Data);
Bitmap bitmap = BitmapFactory.DecodeStream(stream);
MemoryStream memStream = new MemoryStream();
bitmap.Compress(Bitmap.CompressFormat.Jpeg, 50, memStream);
byte[] picData;
picData = memStream.ToArray();

现在 picData 是字节数组，我需要在文档中创建一个 Jpeg 文件并获取新路径..提前谢谢.

now picData is byte array, and I need to create a Jpeg file in doucments and get the new path .. Thanks advance.

答

您可以使用 MemoryStream 绕过并将 Android Bitmap 直接解码/压缩为 FileStream 节省资源(内存和处理时间):

You can bypass using a MemoryStream and decode/compress an Android Bitmap directly to a FileStream to save resources (memory and processing time):

var bitmap = BitmapFactory.BitmapFactory.DecodeStream(stream);
var path = Path.Combine(GetExternalFilesDir(Environment.DirectoryDocuments).AbsolutePath, "sameImagePath.jpg");
if (!File.Exists(path))
{
    using (var filestream = new FileStream(path, FileMode.Create))
    {
        if (bitmap.Compress(Bitmap.CompressFormat.Jpeg, 50, filestream))
        {
            filestream.Flush();
        }
        else {} // handle failure case...
    }
}
bitmap.Recycle();
bitmap.Dispose();

从 Xamarin Android 文档中的字节数组创建图像文件

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