xamarin.forms C# 中的音频暂停

Question

所以我正在使用 xamarin.forms 构建一个需要播放和控制音频的应用程序。我目前已经在 Android 和 iOS 上播放了我的音频文件，但我无法让其他控件工作，例如 .Pause() 和 .Stop()

在两个示例中都可以播放音频。

我先谢谢你了!

这是我针对每个平台的代码

安卓:

using System;
using Xamarin.Forms;
using AudioPlayEx.Droid;
using AudioToolbox;
using Android.Media;
using Android.Content.Res;
using Android.OS;
using Android;

[assembly: Dependency(typeof(AudioService))]
namespace AudioPlayEx.Droid
{
    public class AudioService : IAudio
    {
        public AudioService()
        {
        }

        MediaPlayer player;

        public void PlayAudioFile(string fileName)
        {
            var player = new MediaPlayer();
            var fd = Android.App.Application.Context.Assets.OpenFd(fileName);
            player.Prepared += (s, e) =>
            {
                player.Start();
            };
            player.SetDataSource(fd.FileDescriptor, fd.StartOffset, fd.Length);
            player.Prepare();
        }

        protected MediaPlayer playme;
        public void PauseAudioFile(String fileName)
        {
            var player = new MediaPlayer();
            var fd = Android.App.Application.Context.Assets.OpenFd(fileName);
            player.Prepared += (s, e) =>
            {
                player.Pause();
            };
            player.SetDataSource(fd.FileDescriptor, fd.StartOffset, fd.Length);
            player.Prepare();
        }

    }
}

iOS:

using System;
using Xamarin.Forms;
using AudioPlayEx;
using AudioPlayEx.iOS;
using System.IO;
using Foundation;
using AVFoundation;

[assembly: Dependency(typeof(AudioService))]
namespace AudioPlayEx.iOS
{
    public class AudioService : IAudio
    {
        public AudioService()
        {
        }

        public void PlayAudioFile(string fileName)
        {
            string sFilePath = NSBundle.MainBundle.PathForResource(Path.GetFileNameWithoutExtension(fileName), Path.GetExtension(fileName));
            var url = NSUrl.FromString(sFilePath);
            var _player = AVAudioPlayer.FromUrl(url);
            _player.FinishedPlaying += (object sender, AVStatusEventArgs e) => {
                _player = null;
            };
            _player.Play();
        }


        public void PauseAudioFile(string fileName)
        {
            string sFilePath = NSBundle.MainBundle.PathForResource(Path.GetFileNameWithoutExtension(fileName), Path.GetExtension(fileName));
            var url = NSUrl.FromString(sFilePath);
            var _player = AVAudioPlayer.FromUrl(url);
            _player.Pause();
        }
    }
}

Answer 1

我认为您需要将 AVAudioPlayer 实例保存到变量中并对该对象调用暂停。现在，您正在创建一个新的 AVAudioPlayer 并对其调用暂停，这什么也没做。我添加了 iOS 代码来展示我的意思。 Android 应该类似。

iOS:

public class AudioService : IAudio
{
    AVAudioPlayer _player;

    public void PlayAudioFile(string fileName)
    {
        string sFilePath = NSBundle.MainBundle.PathForResource(Path.GetFileNameWithoutExtension(fileName), Path.GetExtension(fileName));
        var url = NSUrl.FromString(sFilePath);
        _player = AVAudioPlayer.FromUrl(url);
        _player.FinishedPlaying += (object sender, AVStatusEventArgs e) => {
            _player = null;
        };
        _player.Play();
    }


    public void PauseAudioFile(string fileName)
    {
        _player.Pause();
    }
}