阅读Xamarin IDE从SD卡.MP3文件 [英] Read .mp3 file from SD card by Xamarin IDE

问题描述

林建设媒体播放器的家庭作业，并使用Xamarin IDE。
在Xamarin MainActivity文件有外部的.cs。这意味着是C＃文件，我有一些麻烦这一点。
我需要得到从SD卡的数据。但是，当我实现了，我有例外的setDataSource失败。
帮帮我吧。

Im building mediaplayer for homework and using Xamarin IDE. MainActivity file in Xamarin have extern .cs. This mean is C# file and I have some trouble with that. I need get data from SD card. But when i implemented that, i had exception "SetDataSource failed". Help me.

namespace PlayMusic
{
[Activity (Label = "PlayMusic", MainLauncher = true, Icon = "@drawable/icon")]
public class MainActivity : Activity
{

    protected override void OnCreate (Bundle bundle)
    {
        base.OnCreate (bundle);

        // Set our view from the "main" layout resource
        SetContentView (Resource.Layout.Main);

        // Get our button from the layout resource,
        // and attach an event to it

        Button play                     = FindViewById<Button> (Resource.Id.play_btn);

        //MediaPlayer mp                = MediaPlayer.Create (this, Resource.Raw.anniver);
        MediaPlayer mp                  = new MediaPlayer ();
        var directory                   = Android.OS.Environment.ExternalStorageDirectory;
        var fullFileName                = Path.Combine(directory.ToString(), "anniver.mp3");
        mp.SetDataSource (fullFileName);

        play.Click                      += delegate {
            try{
                mp.Start();  
            }
            catch(Exception e)
            {
                e.StackTrace.ToString();
            }  
        };
    }
}
}

结果fullFileName =/storage/sdcard0/anniver.mp3
但是，当IED去的setDataSource（..）语句，有异常IOException异常，失败的setDataSource。
我检查anniver.mp3。说的好。

The result fullFileName = "/storage/sdcard0/anniver.mp3" But when IED go to SetDataSource(..) statement, have exception IOException, and failed SetDataSource. I checked anniver.mp3. That good.

推荐答案

由于您使用 Xamarin 您可以使用 C＃的 Path.Combine 来得到你的文件，像这样：

Since you're using Xamarin you can use c#'s Path.Combine to get to your file like so:

var directory = Android.OS.Environment.ExternalStorageDirectory;

var fullFileName = Path.Combine(directory.ToString(), "1.mp3");
if (File.Exists(fullFileName))
{
    //proceed
}

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