共享原始资源Xamarin Android

Question

我正在尝试添加通过其他应用程序共享文件的可能性，但我无法做到。

我有兴趣通过WhatsApp和Telegram做到这一点，但是当我尝试时，它说"未任命格式"或类似的错误。

            System.IO.Stream inputStream= data.context.Resources.OpenRawResource(data.context.Resources.GetIdentifier(path, "raw", data.context.ApplicationContext.PackageName));
            var sharingIntent = new Intent();
            sharingIntent.SetAction(Intent.ActionSend);
            sharingIntent.PutExtra(Intent.ExtraStream, ReadFully(inputStream));
            sharingIntent.SetType("audio/*");
            data.context.StartActivity(Intent.CreateChooser(sharingIntent, "Share..."));

和转换为字节[]

     public static byte[] ReadFully(System.IO.Stream input)
    {
        byte[] buffer = new byte[16 * 1024];
        using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
        {
            int read;
            while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
            {
                ms.Write(buffer, 0, read);
            }
            return ms.ToArray();
        }
    }

谢谢！

Answer 1

我有兴趣通过WhatsApp和Telegram做到这一点，但是当我尝试时，它说"未任命格式"或类似的错误。

从您的代码中，您试图共享一个大字节数组，该数组既不支持也不建议。正确的方法是将音频文件从内部存储复制到外部存储，然后将其分享到其他应用程序：

：

protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);
        // Set our view from the "main" layout resource
        SetContentView (Resource.Layout.Main);
        //Create a new file in the exteranl storage and copy the file from assets folder to external storage folder
        Java.IO.File dstFile = new Java.IO.File(Environment.ExternalStorageDirectory.Path + "/TestSound.mp3");
        dstFile.CreateNewFile();
        var inputStream = new FileInputStream(Assets.OpenFd("fileName.mp3").FileDescriptor);
        var outputStream = new FileOutputStream(dstFile);
        CopyFile(inputStream,outputStream);
        //to let system scan the audio file and detect it
        Intent intent = new Intent(Intent.ActionMediaScannerScanFile);
        intent.SetData(Uri.FromFile(dstFile));
        this.SendBroadcast(intent);
        //share the Uri of the file
        var sharingIntent = new Intent();
        sharingIntent.SetAction(Intent.ActionSend);
        sharingIntent.PutExtra(Intent.ExtraStream, Uri.FromFile(dstFile));
        sharingIntent.SetType("audio/*");
        this.StartActivity(Intent.CreateChooser(sharingIntent, "Share..."));
    }
    public void CopyFile(FileInputStream inputStream,FileOutputStream outputStream)
    {
        //FileChannel inChannel = new FileInputStream(src).Channel;
        FileChannel inChannel = inputStream.Channel;
        FileChannel outChannel = outputStream.Channel;
        try
        {
            inChannel.TransferTo(0, inChannel.Size(), outChannel);
        }
        finally
        {
            if (inChannel != null)
            {
                inChannel.Close();
            }
            if (outChannel != null)
            {
                outChannel.Close();
            }
        }
    }

更新：

如果音频文件在资源/原始文件夹中，则可以使用以下代码获取FileInputStream：

//My_Heart_Will_Go_On.mp3 in Resources/raw folder
AssetFileDescriptor descripter = this.Resources.OpenRawResourceFd(Resource.Raw.My_Heart_Will_Go_On);
var inputStream = new FileInputStream(descripter.FileDescriptor);

注意：如果Visual Studio未更新Resource.Designer.cs的CC_1，则可以手动更新Resource.Designer.cs，如下所示：

[System.CodeDom.Compiler.GeneratedCodeAttribute("Xamarin.Android.Build.Tasks", "1.0.0.0")]
public partial class Resource
{
   ...
   public partial class Raw
    {
        static Raw()
        {
            global::Android.Runtime.ResourceIdManager.UpdateIdValues();
        }
        private Raw()
        {
        }
    }
}

重建项目时，部分类Raw不会被覆盖。