Android 酷炫来袭：制作属于你自己的音频播放器（综合运用MediaPlayer、Service、Broadcast、ListView、SeekBar）

来源：互联网发布：淘宝行业数据哪里看编辑：程序博客网时间：2024/06/06 21:22

　　这里写图片描述
　　今天制作了一个属于自己的音乐播放器感觉还不错，分享出来，希望能够帮助大家。感觉知识点挺多的，也挺使用的，大大提高了个人兴趣，哈哈，我是程序员啊程序员。
为了有所侧重，我将注意点和学习点放在文章的最开篇。

一、学习重点与注意点

1、Mediaplayer的生命周期、相关方法及其使用
2、如何自定义SeekBar
3、接收广播的动态注册与注销
4、获取文件路径
5、获取歌曲的名称、作者名、图片
6、Service服务的使用

二、Mediaplayer介绍

　　想要制作一个属于自己的风格样式的音乐播放器，首先我们要学会使用音乐播放器。

Mediaplayer的生命周期

具体的查看API，这里附一张生命周期图。
这里写图片描述
　　Mediaplayer的证明周期中我们可以看出，Mediaplayer开始的时候需要调用reset()方法，然后是setDataResource()-prepare()-start()在MediaPlayer开启之后，我们可以让它暂停和停止等操作。
reset()：将Mediaplayer对象重置到刚刚创建的状态。
setDataResource()：设置要播放的音频文件的位置。
prepare()：在开始播放之前调用这个方法完成准备工作（使用之前需要设置prepare监听）。
start()：开始或继续播放音频文件
seekTo()：从指定位置开始播放
stop():停止播放音频。
getDuration():获取载入的音频文件的时长
getCurrentPosition()：获取音频文件的当前播放位置

简单的使用方法

点击按钮设置音频播放

public class MainActivity extends Activity implements OnClickListener{    private Button mbtn_start;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mbtn_start=(Button) findViewById(R.id.bt_start);        mbtn_start.setOnClickListener(this);        //获取文件路径，如果我们不知道文件具体放在那里可以通过log打印出来        File musicDir=Environment.getExternalStorageDirectory();        Log.d("音乐", Environment.getExternalStorageDirectory().getAbsolutePath());        musicDir = new File(musicDir, "/musics");        Toast.makeText(getApplicationContext(), Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getAbsolutePath(),                Toast.LENGTH_LONG).show();        File[] files=musicDir.listFiles();//获取所有的文件        for(File file:files){            Log.d("路径", file.getAbsolutePath());            }    }    @Override    public void onClick(View v) {        switch (v.getId()) {        case R.id.bt_start:        //new 一个新Mediaplayer对象，按照生命周期顺序操作            MediaPlayer mediaplayer=new MediaPlayer();            mediaplayer.reset();            File musicDir=Environment.getExternalStorageDirectory();                    File[] files=musicDir.listFiles();//获取所有的文件            for(File file:files){                Log.d("路径", file.getAbsolutePath());            }            try {                mediaplayer.setDataSource(files[23].getAbsolutePath());                mediaplayer.prepare();                //设置prepare监听器，查看是否准备好，可以开始？                mediaplayer.setOnPreparedListener(new OnPreparedListener() {                    @Override                    public void onPrepared(MediaPlayer mp) {              //准备好了之后开始播放                        mp.start();                    }                });            } catch (IllegalStateException e) {                // TODO Auto-generated catch block                e.printStackTrace();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }                           break;        default:            break;        }    }   }

注意：我们还需要在manifest中获取读sdcard的权限。

三、制作音频播放器

Ⅰ 开启音乐并使音乐能够在后台运行

1、制作布局，ListView（+子布局+Adapter）+SeekBar+TextView+ToggleButton
2、循序渐进：书写MusicService类继承Service (这里别忘记在manifest中注册)，为了保证音乐能够在后台运行，在之后的步骤中我们将在MusicService中创建线程，开启音乐。
3、开启MusicService：在MainActivity中获得文件路径，通过Intent的putStringArrayListExtra的方法传递给MusicService，并监听listview的item点击事件找到要播放的文件的position传递给Service。
4、在MusicService中创建线程，开启音乐

①布局+ListView+子布局+Adapter

在布局中我们顺便学习一下自定义SeekBar样式
新建xml文件，设置点击图片

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >    <item android:drawable="@drawable/list_btn_radio_check_on" android:state_focused="true" android:state_window_focused="true"></item> <item android:drawable="@drawable/list_btn_radio_check_on" android:state_selected="true" android:state_window_focused="true"></item>  <item android:drawable="@drawable/list_btn_radio_check_on" android:state_pressed="true" android:state_window_focused="true"></item>   <item android:drawable="@drawable/list_btn_radio_check_off" ></item></selector>

SeekBar引用（通过设置Thumb）

  <SeekBar        android:id="@+id/seekbar"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:progress="20"        android:thumb="@drawable/seekbarimg"         android:layout_weight="1"/>

Adapter

public class MusicAdapter extends BaseAdapter {    private LayoutInflater minflate;    //传递所有文件路径    private File[] musicDirs;    public MusicAdapter(LayoutInflater minflate, File[] musicDirs) {        super();        this.minflate = minflate;        this.musicDirs = musicDirs;    }    @Override    public int getCount() {        // TODO Auto-generated method stub        return musicDirs.length;    }    @Override    public Object getItem(int position) {        // TODO Auto-generated method stub        return position;    }    @Override    public long getItemId(int position) {        // TODO Auto-generated method stub        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder vh = null;        if (convertView == null) {            vh = new ViewHolder();            convertView = minflate.inflate(R.layout.item_music_name, null);            vh.mtextview = (TextView) convertView                    .findViewById(R.id.textview_music_name);            vh.mtextview_author = (TextView) convertView                    .findViewById(R.id.textview_author_name);            vh.img = (ImageView) convertView.findViewById(R.id.img);            convertView.setTag(vh);        } else {            vh = (ViewHolder) convertView.getTag();        }        vh.mtextview.setText(musicDirs[position].getName());        //通过MediaMetadataRetriever的对象来获取音频文件的        //歌名、歌手、自带的图片        MediaMetadataRetriever mnr = new MediaMetadataRetriever();        Log.d("路径", musicDirs[position].getAbsolutePath());        mnr.setDataSource(musicDirs[position].getAbsolutePath());        String author = mnr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST);        //获取作者名，不为空对textview进行重新设置        if (author != null) {            vh.mtextview_author.setText(author);        } else {            vh.mtextview_author.setText("<未知>");        }        //获取二进制图片        byte[] img = mnr.getEmbeddedPicture();        if (img != null) {        //将二进制文件转换成位图进行添加专辑图片            Bitmap bitmap = BitmapFactory.decodeByteArray(img, 0, img.length);            vh.img.setImageBitmap(bitmap);        } else {            vh.img.setImageResource(R.drawable.audio_identify_singer_default);        }        return convertView;    }    class ViewHolder {        TextView mtextview;        TextView mtextview_author;        ImageView img;    }}

这里我们将重点学习的地方提取出来。
获取作者与图片

//通过MediaMetadataRetriever的对象来获取音频文件的        //歌名、歌手、自带的图片        MediaMetadataRetriever mnr = new MediaMetadataRetriever();        Log.d("路径", musicDirs[position].getAbsolutePath());        mnr.setDataSource(musicDirs[position].getAbsolutePath());        String author = mnr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST);

    //获取二进制图片        byte[] img = mnr.getEmbeddedPicture();        if (img != null) {        //将二进制文件转换成位图进行添加专辑图片            Bitmap bitmap = BitmapFactory.decodeByteArray(img, 0, img.length);            vh.img.setImageBitmap(bitmap);        } else {            vh.img.setImageResource(R.drawable.audio_identify_singer_default);        }

②获取并传递音频文件路径，开启Service

musicDir = Environment.getExternalStorageDirectory();        musicDir = new File(musicDir, "/musics");        files = musicDir.listFiles();

Intent intent = new Intent(getApplicationContext(), MusicService.class);        intent.putStringArrayListExtra("all_music_path", files_path);        startService(intent);

监听ListView
在这里每次点击后开启服务，设置开始键样式为
这里写图片描述

    @Override    public void onItemClick(AdapterView<?> parent, View view, int position,            long id) {            //设置为选中状态，样式改变        mradoibutton_start.setChecked(true);        Intent intent = new Intent(getApplicationContext(), MusicService.class);        intent.putExtra("type", Config.START_NEW_MUSIC_LISTVIEW);        intent.putExtra("music_position",position );                intent.putExtra("all_music_path", files_path);        startService(intent);    }

③Service中创建线程，开启音乐

在onStartCommand方法中调用而不是onCreate方法，因为在每次服务启动的时候该方法都会调用，而onCreate方法则是只有在服务被创建的时候才被调用。

  public void  startNewMusiclistview(){        if(mediaplayer==null){            mediaplayer=new MediaPlayer();        }             mediaplayer.reset();                             try {                    mediaplayer.setDataSource(musicspath.get(musicposition).toString());                    mediaplayer.prepare();                    mediaplayer.setOnPreparedListener(new OnPreparedListener() {                        @Override                        public void onPrepared(MediaPlayer mp) {                            mediaplayer.start();                            mediaplayer.getCurrentPosition();                            int duration=mediaplayer.getDuration();                            Intent  intent2=new Intent("play");                            intent2.putExtra("type", 0);                            intent2.putExtra("totaltime",mediaplayer.getDuration());                             intent2.putExtra("ischecked", true);                 //这里发送广播给MainActivity，将总时间传递给SeekBar                            sendBroadcast(intent2);                    //开启线程，发送广播给MainActivity                                    //用于与seekbar关联，设置SeekBar进度                            MyThreadPlay  myplaythread=new MyThreadPlay();                            myplaythread.start();                        }                    });                    //为了循环播放音乐，对当前音频的播放完成情况进行检测                    //使它能够在播放完一首歌曲之后播放下一首歌曲                   mediaplayer.setOnCompletionListener(new OnCompletionListener() {                    @Override                    public void onCompletion(MediaPlayer mp) {        //最后一个文件时，让位置重新回到开始，通过递归进行循环播放            if(musicposition==musicspath.size()-1){                            musicposition=0;                        }else{                            musicposition++;                        }                                           startNewMusiclistview();                    }                });                } catch (IllegalArgumentException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (SecurityException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (IllegalStateException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }                                       }

Ⅱ创建线程，发送广播与SeekBar可拖动滚动条关联

①由音频文件属性设置Seekbar进度

MusicService中发送广播

 class MyThreadPlay extends Thread{       @Override    public void run() {           while(mediaplayer.isPlaying()){                            Intent intent=new Intent("play");               intent.putExtra("type", 1);               intent.putExtra("currentime", mediaplayer.getCurrentPosition());               sendBroadcast(intent);               try {                Thread.sleep(1000);            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }           }    }   }

MainActivity接收
注意接收者在mainActivity中的动态注册与注销
动态注册BroadcastReceiver

receiver = new MyReceiver();        IntentFilter filter = new IntentFilter();        filter.addAction("play");        registerReceiver(receiver, filter);

BroadcastReceiver的继承类

//该类用于接收MusicService发过来的广播，用于设置textview与seekbarclass MyReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            int type = intent.getIntExtra("type", 0);            //由于我们获得的时间是毫秒数，因此要进行相应转换             Date date = new Date();                 SimpleDateFormat format=new SimpleDateFormat("mm:ss");             //通过判断intent的type来确定设置进度还是设置时间            switch (type) {            case 0:                int duration = intent.getIntExtra("totaltime", 0);                  date.setTime(duration);                String  format_duration= format.format(date);                //设置seekbar最大值，这样才能控制进度                mseekbar.setMax(duration);                mtv_totaltime.setText("" + format_duration);                break;            case 1:                 currenttime = intent.getIntExtra("currentime", 0);                  date.setTime(currenttime);                String  format_currenttime= format.format(date);                mtv_currenttime.setText(format_currenttime);                mseekbar.setProgress(currenttime);                break;            default:                break;            }        }    }

注销BroadcastReceiver

    @Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(receiver);    }

②通过监听SeekBar的进度改变音频文件进度

上面的代码中我们只实现了音频文件对SeekBar进度的改变时不行的，下面我们通过对SeekBar的监听来改变音频文件

mseekbar.setOnSeekBarChangeListener(this);

  //SeekBar改变过程中时调用    @Override    public void onProgressChanged(SeekBar seekBar, int progress,            boolean fromUser) {    }    //SeekBar开始改变时调用    @Override    public void onStartTrackingTouch(SeekBar seekBar) {    } //SeekBar最终停止改变时调用，我们在这个方法中进行对音频文件的进度修改    @Override    public void onStopTrackingTouch(SeekBar seekBar) {        Intent intent = new Intent(getApplicationContext(), MusicService.class);        intent.putExtra("type", Config.SEEKTO);        intent.putExtra("progress", mseekbar.getProgress());        startService(intent);    }

MusicService中进行修改进度

            int progress=intent.getIntExtra("progress", 0);            mediaplayer.seekTo(progress);

Ⅲ上一曲、下一曲、开始、停止按钮的监听

MainActivity
上一曲、下一曲的监听只是传递的类型不同，只有停止开始按钮不太一样，因为它在开始与停止状态的图片有变化。

@Override    public void onClick(View v) {        Intent intent = new Intent(getApplicationContext(), MusicService.class);        switch (v.getId()) {        case R.id.bt_previeous:                     intent.putExtra("type", Config.SELECT_PREVIOUS_BY_TOGGLEBUTTON);            startService(intent);            break;        case R.id.bt_next:            intent.putExtra("type", Config.SELECT_NEXT_BY_TOGGLEBUTTON);            startService(intent);            break;        case R.id.bt_start:            if(flag){                intent.putExtra("type", Config.START_NOW_BY_TOGGLEBUTTON);                intent.putExtra("mcurrenttime",currenttime);                            startService(intent);                flag=!flag;            }else{                              intent.putExtra("type", Config.PAUSE_NOW_BY_TOGGLEBUTTON);                          startService(intent);                flag=!flag;            }            break;        default:            break;        }

MusicService中的只是把当前文件位置进行加、减、暂停、继续

int type=intent.getIntExtra("type",222);    switch (type) {        case Config.START_NEW_MUSIC_LISTVIEW:            musicposition=intent.getIntExtra("music_position", 0);                      currentposition=musicposition;            startNewMusiclistview();            break;        case Config.SEEKTO:            int progress=intent.getIntExtra("progress", 0);            mediaplayer.seekTo(progress);            break;        case Config.START_NOW_BY_TOGGLEBUTTON:                          int currenttime=intent.getIntExtra("mcurrenttime", 0);               while (!mediaplayer.isPlaying()) {                mediaplayer.start();            }        //  startNewMusiclistview();                    break;        case Config.PAUSE_NOW_BY_TOGGLEBUTTON:            while (mediaplayer.isPlaying()) {                mediaplayer.pause();            }            break;        case Config.SELECT_PREVIOUS_BY_TOGGLEBUTTON:            Log.d("musicString",currentposition +"");            if(currentposition==0){                musicposition=musicspath.size()-1;            }else{                musicposition--;            }            currentposition=musicposition;            startNewMusiclistview();            break;        case Config.SELECT_NEXT_BY_TOGGLEBUTTON:            if(currentposition==musicspath.size()-1){                musicposition=0;            }else{                musicposition++;            }            currentposition=musicposition;            startNewMusiclistview();            break;        case 222:break;        default:            break;        }

ⅣConfig.class文件

该文件中专门用于存放判别type的常量

package com.example.mymediaplayerdemo;public class Config {  public static final int START_NEW_MUSIC_LISTVIEW=0x01;  public static final int SEEKTO=0x02;  public static final int START_NOW_BY_TOGGLEBUTTON=0x03;  public static final int PAUSE_NOW_BY_TOGGLEBUTTON=0x04;  public static final int SELECT_PREVIOUS_BY_TOGGLEBUTTON=0x05;  public static final int SELECT_NEXT_BY_TOGGLEBUTTON=0x06;}

主要代码

MainActivity

public class MainActivity extends Activity implements OnClickListener,        OnSeekBarChangeListener, OnItemClickListener {    private ListView mlistview;    private TextView mtv_currenttime;    private TextView mtv_totaltime;    private ToggleButton mradoibutton_pre;    private ToggleButton mradoibutton_start;    private ToggleButton mradoibutton_next;    private SeekBar mseekbar;    private File musicDir;    private File[] files;    private int seekbarprogress;    private MusicAdapter madapter;    private LayoutInflater inflater;    private MyReceiver receiver;    private  ArrayList<String> files_path=new ArrayList<String>();    private int currenttime;    private boolean flag=false;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_main);        mradoibutton_pre = (ToggleButton) findViewById(R.id.bt_previeous);        mradoibutton_start = (ToggleButton) findViewById(R.id.bt_start);        mradoibutton_next = (ToggleButton) findViewById(R.id.bt_next);        mseekbar = (SeekBar) findViewById(R.id.seekbar);        mlistview = (ListView) findViewById(R.id.listview);        mtv_totaltime = (TextView) findViewById(R.id.textview_totaltime);        mtv_currenttime = (TextView) findViewById(R.id.textview_currenttime);        receiver = new MyReceiver();        IntentFilter filter = new IntentFilter();        filter.addAction("play");        registerReceiver(receiver, filter);        musicDir = Environment.getExternalStorageDirectory();        musicDir = new File(musicDir, "/musics");        files = musicDir.listFiles();//      for (File file : files) {//          Log.d("音乐文件", file.getName() + "路径" + file.getAbsolutePath());//          //      }        for (int i = 0; i < files.length; i++) {            files_path.add(files[i].getAbsolutePath().toString());            Log.d("files_path", files_path.get(i));            }        Intent intent = new Intent(getApplicationContext(), MusicService.class);        intent.putStringArrayListExtra("all_music_path", files_path);        startService(intent);        inflater = getLayoutInflater();        madapter = new MusicAdapter(inflater, files);        mlistview.setAdapter(madapter);        mlistview.setOnItemClickListener(this);        mradoibutton_pre.setOnClickListener(this);        mradoibutton_start.setOnClickListener(this);                                mradoibutton_next.setOnClickListener(this);        mseekbar.setOnSeekBarChangeListener(this);    }    @Override    public void onItemClick(AdapterView<?> parent, View view, int position,            long id) {        mradoibutton_start.setChecked(true);        Intent intent = new Intent(getApplicationContext(), MusicService.class);        intent.putExtra("type", Config.START_NEW_MUSIC_LISTVIEW);        intent.putExtra("music_position",position );                intent.putExtra("all_music_path", files_path);        startService(intent);    }    class MyReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            int type = intent.getIntExtra("type", 0);             Date date = new Date();                 SimpleDateFormat format=new SimpleDateFormat("mm:ss");            switch (type) {            case 0:                int duration = intent.getIntExtra("totaltime", 0);                  date.setTime(duration);                String  format_duration= format.format(date);                mseekbar.setMax(duration);                mtv_totaltime.setText("" + format_duration);                break;            case 1:                 currenttime = intent.getIntExtra("currentime", 0);                  date.setTime(currenttime);                String  format_currenttime= format.format(date);                mtv_currenttime.setText(format_currenttime);                mseekbar.setProgress(currenttime);                break;            default:                break;            }        }    }    @Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(receiver);    }    @Override    public void onProgressChanged(SeekBar seekBar, int progress,            boolean fromUser) {        // TODO Auto-generated method stub    }    @Override    public void onStartTrackingTouch(SeekBar seekBar) {        // TODO Auto-generated method stub    }    @Override    public void onStopTrackingTouch(SeekBar seekBar) {        Intent intent = new Intent(getApplicationContext(), MusicService.class);        intent.putExtra("type", Config.SEEKTO);        intent.putExtra("progress", mseekbar.getProgress());        startService(intent);    }    @Override    public void onClick(View v) {        Intent intent = new Intent(getApplicationContext(), MusicService.class);        switch (v.getId()) {        case R.id.bt_previeous:                     intent.putExtra("type", Config.SELECT_PREVIOUS_BY_TOGGLEBUTTON);            startService(intent);            break;        case R.id.bt_next:            intent.putExtra("type", Config.SELECT_NEXT_BY_TOGGLEBUTTON);            startService(intent);            break;        case R.id.bt_start:            if(flag){                intent.putExtra("type", Config.START_NOW_BY_TOGGLEBUTTON);                intent.putExtra("mcurrenttime",currenttime);                            startService(intent);                flag=!flag;            }else{                              intent.putExtra("type", Config.PAUSE_NOW_BY_TOGGLEBUTTON);                          startService(intent);                flag=!flag;            }            break;        default:            break;        }    }}

MusicService

public class MusicService extends Service{    private MediaPlayer mediaplayer;    private  int musicposition;    private ArrayList<String> musicspath;    private int currentposition;    @Override    public IBinder onBind(Intent intent) {        // TODO Auto-generated method stub        return null;    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        if(musicspath==null){            musicspath=intent.getStringArrayListExtra("all_music_path");        }           int type=intent.getIntExtra("type",222);        switch (type) {        case Config.START_NEW_MUSIC_LISTVIEW:            musicposition=intent.getIntExtra("music_position", 0);                      currentposition=musicposition;            startNewMusiclistview();            break;        case Config.SEEKTO:            int progress=intent.getIntExtra("progress", 0);            mediaplayer.seekTo(progress);            break;        case Config.START_NOW_BY_TOGGLEBUTTON:                          int currenttime=intent.getIntExtra("mcurrenttime", 0);               while (!mediaplayer.isPlaying()) {                mediaplayer.start();            }        //  startNewMusiclistview();                    break;        case Config.PAUSE_NOW_BY_TOGGLEBUTTON:            while (mediaplayer.isPlaying()) {                mediaplayer.pause();            }            break;        case Config.SELECT_PREVIOUS_BY_TOGGLEBUTTON:            Log.d("musicString",currentposition +"");            if(currentposition==0){                musicposition=musicspath.size()-1;            }else{                musicposition--;            }            currentposition=musicposition;            startNewMusiclistview();            break;        case Config.SELECT_NEXT_BY_TOGGLEBUTTON:            if(currentposition==musicspath.size()-1){                musicposition=0;            }else{                musicposition++;            }            currentposition=musicposition;            startNewMusiclistview();            break;        case 222:break;        default:            break;        }        return super.onStartCommand(intent, flags, startId);    }  public void  startNewMusiclistview(){        if(mediaplayer==null){            mediaplayer=new MediaPlayer();        }             mediaplayer.reset();                             try {                    mediaplayer.setDataSource(musicspath.get(musicposition).toString());                    mediaplayer.prepare();                    mediaplayer.setOnPreparedListener(new OnPreparedListener() {                        @Override                        public void onPrepared(MediaPlayer mp) {                            mediaplayer.start();                            mediaplayer.getCurrentPosition();                            int duration=mediaplayer.getDuration();                            Intent  intent2=new Intent("play");                            intent2.putExtra("type", 0);                            intent2.putExtra("totaltime",mediaplayer.getDuration());                             intent2.putExtra("ischecked", true);                            sendBroadcast(intent2);                            MyThreadPlay  myplaythread=new MyThreadPlay();                            myplaythread.start();                        }                    });                   mediaplayer.setOnCompletionListener(new OnCompletionListener() {                    @Override                    public void onCompletion(MediaPlayer mp) {                        if(musicposition==musicspath.size()-1){                            musicposition=0;                        }else{                            musicposition++;                        }                                           startNewMusiclistview();                    }                });                } catch (IllegalArgumentException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (SecurityException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (IllegalStateException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }                                       }   class MyThreadPlay extends Thread{       @Override    public void run() {           while(mediaplayer.isPlaying()){                            Intent intent=new Intent("play");               intent.putExtra("type", 1);               intent.putExtra("currentime", mediaplayer.getCurrentPosition());                          sendBroadcast(intent);                      try {                Thread.sleep(1000);            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }           }    }   }}

Adapter

public class MusicAdapter extends BaseAdapter {    private LayoutInflater minflate;    private File[] musicDirs;    public MusicAdapter(LayoutInflater minflate, File[] musicDirs) {        super();        this.minflate = minflate;        this.musicDirs = musicDirs;    }    @Override    public int getCount() {        // TODO Auto-generated method stub        return musicDirs.length;    }    @Override    public Object getItem(int position) {        // TODO Auto-generated method stub        return position;    }    @Override    public long getItemId(int position) {        // TODO Auto-generated method stub        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder vh = null;        if (convertView == null) {            vh = new ViewHolder();            convertView = minflate.inflate(R.layout.item_music_name, null);            vh.mtextview = (TextView) convertView                    .findViewById(R.id.textview_music_name);            vh.mtextview_author = (TextView) convertView                    .findViewById(R.id.textview_author_name);            vh.img = (ImageView) convertView.findViewById(R.id.img);            convertView.setTag(vh);        } else {            vh = (ViewHolder) convertView.getTag();        }        vh.mtextview.setText(musicDirs[position].getName());        MediaMetadataRetriever mnr = new MediaMetadataRetriever();        Log.d("路径", musicDirs[position].getAbsolutePath());        mnr.setDataSource(musicDirs[position].getAbsolutePath());        String author = mnr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST);        if (author != null) {            vh.mtextview_author.setText(author);        } else {            vh.mtextview_author.setText("<未知>");        }        byte[] img = mnr.getEmbeddedPicture();        if (img != null) {            Bitmap bitmap = BitmapFactory.decodeByteArray(img, 0, img.length);            vh.img.setImageBitmap(bitmap);        } else {            vh.img.setImageResource(R.drawable.audio_identify_singer_default);        }        return convertView;    }    class ViewHolder {        TextView mtextview;        TextView mtextview_author;        ImageView img;    }}

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