如何在Xamarin.Forms中播放系统声音

Question

我正在寻找轻量级内置系统跨平台音响播放器。类似于System.Console.Beep的东西，我可以直接从视图模型中调用。

我知道我可以使用提供者(策略)模式来构建平台特定的实现，或者使用像XamarinMediaManager这样的媒体播放器。

Answer 1

可以使用依赖关系服务。

ANDROID

public class AudioService : IAudio
{

    private MediaPlayer _mediaPlayer;

    public bool PlayFile()
    {
        _mediaPlayer = MediaPlayer.Create(global::Android.App.Application.Context, Resource.Raw.test);
        _mediaPlayer.Start();

        return true;
    }

}

IOS

public class AudioService : IAudio
{

private AVAudioPlayer _ringtoneAudioPlayer;
public AudioService()
{
    _ringtoneAudioPlayer = AVAudioPlayer.FromUrl(NSUrl.FromFilename("call.caf"));
    _ringtoneAudioPlayer.NumberOfLoops = -1; // infinite
}

public void PlayFile()
{
    if (_ringtoneAudioPlayer != null)
    {
        _ringtoneAudioPlayer.Stop();
    }
    _ringtoneAudioPlayer.Play();
}
} 

UWP

public class AudioService : IAudio
{

    public async Task PlayAudioUWP(string fileName)
    {
        StorageFolder Folder = await Package.Current.InstalledLocation.GetFolderAsync("Assets");
        StorageFile sf = await Folder.GetFileAsync(fileName);
        var PlayMusic = new MediaElement();
        PlayMusic.AudioCategory = Windows.UI.Xaml.Media.AudioCategory.Media;
        PlayMusic.SetSource(await sf.OpenAsync(FileAccessMode.Read), sf.ContentType);
        PlayMusic.Play();
    }

}

如果你愿意的话，你可以试试这个插件

https://www.nuget.org/packages/XamarinAudioManager/