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1*********************** MainActivity.javapackage com.example.mymusic01;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.ListView;import java.io.File;import java.util.ArrayList;import java.util.List;public class MainActivity extends Activity {
       private List
   
     MusicList = new ArrayList
    
     ();    private MP3Player mp3Player;    @Override    protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);//        initFruits(); // 初始化水果数据        System.out.println("11111111");        System.out.println(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC));        ///mnt/sdcard/Music   /sdcard/kgmusic/download/刘媛媛 - 五星红旗.mp3        File file=new File("/sdcard/kgmusic/download");        final File[] files=file.listFiles();        if (files == null){
               Log.e("error","空目录");        }        List
     
       s = new ArrayList<>();        for(int i =0;i
      
        parent, View view, int position, long id) {
                   System.out.println(id);                System.out.println(files[(int)id].getAbsolutePath());                mp3Player = new MP3Player(MainActivity.this);                mp3Player.init(files[(int)id].getName());                mp3Player.play();            }        });    }}2 ***********************activity_main.xml
       
           
         
        
       3 *********************** MP3Play.javapackage com.example.mymusic01;import android.content.Context;import android.media.MediaPlayer;import android.os.Environment;import android.widget.Toast;import java.io.IOException;public class MP3Player {
       private MediaPlayer mp;    private String path;    private int length;    public MP3Player(Context ctx) {
           mp = new MediaPlayer();        // 获取内部存储器绝对路径/sdcard/Download/ANewDay.mp3        path = Environment.getExternalStorageDirectory().getAbsolutePath();        path="/sdcard/kgmusic/download";        Toast.makeText(ctx, path, Toast.LENGTH_LONG).show();    }    public int getPosition() {
           // 获取当前位置        return mp.getCurrentPosition();    }    public int getLength() {
           return length;    }    public void init(String fileName) {
           path = path + "/" + fileName;        try {
               // 存储在SD卡或其他文件路径下的媒体文件            mp.setDataSource(path);            // 音乐文件准备            mp.prepare();            // 音乐文件长度            length = mp.getDuration();        } catch (IOException e) {
               e.printStackTrace();        }    }    public void play() {
           if (mp.isPlaying()) {
               mp.stop();        }        else {
               mp.start();        }    }    public void pause() {
           mp.pause();    }    public void stop() {
           mp.stop();    }    public void destroy() {
           mp.release();    }}4*********************** MusicName.javapackage com.example.mymusic01;public class MusicName {
       private String name;    private String MusicId;    public MusicName(String name, String MusicId) {
           this.name = name;        this.MusicId = MusicId;    }    public String getName() {
           return name;    }    public String getImageId() {
           return MusicId;    }}5*********************** MusicAdapter.javapackage com.example.mymusic01;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageView;import android.widget.TextView;import java.util.List;public class MusicAdapter extends ArrayAdapter{
       private final int resourceId;    //MusicAdapter(MainActivity.this, R.layout.name_item, fruitList);    public MusicAdapter(Context context, int textViewResourceId, List
       
         objects) {
           super(context, textViewResourceId, objects);        resourceId = textViewResourceId;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {
           MusicName fruit = (MusicName) getItem(position); // 获取当前项的Fruit实例        View view = LayoutInflater.from(getContext()).inflate(resourceId, null);//实例化一个对象        TextView MusicID = (TextView) view.findViewById(R.id.Music_id);//获取该布局内的图片视图        TextView MusicNameTV = (TextView) view.findViewById(R.id.Music_name);//获取该布局内的文本视图        MusicID.setText(fruit.getImageId());//为图片视图设置图片资源        MusicNameTV.setText(fruit.getName());//为文本视图设置文本内容        return view;    }}6*********************** name_item.xml
        
         
          
         
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