mono for android 获取不到正确mediaPlayer的duration 并且Stop()方法和Pause()方法效果居然一样

2016-02-03 05:03:30 422 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

安卓Android开发：使用AudioRecord录音、将录音保存为wav文件、使用AudioTrack保存录音一、使用AudioRrecord录音 1.1声明首先需要声明一个AudioRecord类的实例。之所以需要事先声明，是因为在本例中，录音的启动和结束被封装在两个不同的方法里。而通常来讲，“开始录音”和“结束录音”在大部分时候也确实是需要拆分成两个不同的动作的。 private AudioRecord audioRecord; 除了声明AudioRecord的实例之外，我们还需要准备一些参数： // 采样率，现在能够保证在所有设备上使用的采样率是44100Hz, 但是其他的采样率（22050, 阅读详情

using System;

using System.Threading;



using Android.App;

using Android.Content;

using Android.Runtime;

using Android.Views;

using Android.Widget;

using Android.OS;

using Android.Media;

using Android.Util;



namespace mediaPlayer

{

    [Activity(Label = "mediaPlayer", MainLauncher = true, Icon = "@drawable/icon")]

    public class MainActivity : Activity,MediaPlayer.IOnCompletionListener

    {

        int count = 1;

        MediaPlayer idPlayer;

        TextView tv;

        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 button = FindViewById<Button>(Resource.Id.MyButton);



            button.Click += delegate { button.Text = string.Format("{0} clicks!", count++); };



            Button playId = FindViewById<Button>(Resource.Id.button1);

            playId.Click += playId_Click;

            Button stop = FindViewById<Button>(Resource.Id.button2);

            stop.Click += playNet_Click;

            Button pause = FindViewById<Button>(Resource.Id.button3);

            pause.Click += playFile_Click;

            Button video = FindViewById<Button>(Resource.Id.button4);

            video.Click += video_Click;

            tv = FindViewById<TextView>(Resource.Id.textView1);

        }



        void video_Click(object sender, EventArgs e)

        {

            Intent intent = new Intent(this, typeof(Video));

            StartActivity(intent);  

        }





        void playFile_Click(object sender, EventArgs e)

        {

            idPlayer.Pause();

        }



        void playNet_Click(object sender, EventArgs e)

        {

            idPlayer.Stop();

            //int position = idPlayer.CurrentPosition / 1000;

            //Toast.MakeText(this, position.ToString(), ToastLength.Short).Show();

        }



        void playId_Click(object sender, EventArgs e)

        {

            idPlayer = new MediaPlayer();

            if (idPlayer != null)

            {

                idPlayer.SetDataSource(this.Resources.OpenRawResourceFd(Resource.Raw.yshq).FileDescriptor);

                idPlayer.SetOnCompletionListener(this);

                idPlayer.Prepare();                

                idPlayer.Start();

                Thread thread = new Thread(new ThreadStart(Run));

                thread.Start();

            }

        }



        private void Run()

        {

            while (true)

            {

                Thread.Sleep(1000);

                int i = (idPlayer.CurrentPosition / 1000);

                RunOnUiThread(() =>

                {

                    //打印当前音乐播放当前时间和总时间

                    //当前时间输出正确

                    //总共时间输出415 (总共时间为15s)

                    tv.Text = i.ToString() + "&&&" +(idPlayer.Duration).ToString();

                });

                if(i == 15)

                {

                    break;

                }

            }

        }



        public void OnCompletion(MediaPlayer mp)

        {

            mp.Stop();

            mp.Release();

        }

    }

}