Android音乐播放器制作扫描本地音乐显示在手机（一）

package com.duanlian.mymusicplayerdemo.bean; 

/** 
 * Created by user on 2016/6/24. 
 * 放置音乐 
 */ 
public class Song { 
 /** 
 * 歌手 
 */ 
 public String singer; 
 /** 
 * 歌曲名 
 */ 
 public String song; 
 /** 
 * 歌曲的地址 
 */ 
 public String path; 
 /** 
 * 歌曲长度 
 */ 
 public int duration; 
 /** 
 * 歌曲的大小 
 */ 
 public long size; 
} 

package com.duanlian.mymusicplayerdemo.utils; 
 
import android.content.Context; 
import android.database.Cursor; 
import android.provider.MediaStore; 
 
import com.duanlian.mymusicplayerdemo.bean.Song; 
 
import java.util.ArrayList; 
import java.util.List; 
 
 
/** 
 * 音乐工具类, 
 */ 
public class MusicUtils { 
 /** 
 * 扫描系统里面的音频文件，返回一个list集合 
 */ 
 public static List getMusicData(Context context) { 
 List list = new ArrayList(); 
 // 媒体库查询语句（写一个工具类MusicUtils） 
 Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, 
  null, MediaStore.Audio.AudioColumns.IS_MUSIC); 
 if (cursor != null) { 
  while (cursor.moveToNext()) { 
  Song sOng= new Song(); 
  song.sOng= cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME)); 
  song.singer = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)); 
  song.path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); 
  song.duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)); 
  song.size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE)); 
  if (song.size > 1000 * 800) { 
   // 注释部分是切割标题，分离出歌曲名和歌手 （本地媒体库读取的歌曲信息不规范） 
   if (song.song.contains("-")) { 
   String[] str = song.song.split("-"); 
   song.singer = str[0]; 
   song.sOng= str[1]; 
   } 
   list.add(song); 
  } 
  } 
  // 释放资源 
  cursor.close(); 
 } 
 
 return list; 
 } 
 
 /** 
 * 定义一个方法用来格式化获取到的时间 
 */ 
 public static String formatTime(int time) { 
 if (time / 1000 % 60 <10) { 
  return time / 1000 / 60 + ":0" + time / 1000 % 60; 
 
 } else { 
  return time / 1000 / 60 + ":" + time / 1000 % 60; 
 } 
 
 } 
} 

<&＃63;xml version="1.0" encoding="utf-8"&＃63;> 
 
 
  
  
 

package com.duanlian.mymusicplayerdemo; 
 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.widget.ListView; 
 
import com.duanlian.mymusicplayerdemo.adapter.MyAdapter; 
import com.duanlian.mymusicplayerdemo.bean.Song; 
import com.duanlian.mymusicplayerdemo.utils.MusicUtils; 
 
import java.util.ArrayList; 
import java.util.List; 
 
public class MainActivity extends AppCompatActivity { 
 
 private ListView mListView; 
 private List list; 
 private MyAdapter adapter; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 initView(); 
 } 
 
 /** 
 * 初始化view 
 */ 
 private void initView() { 
  mListView = (ListView) findViewById(R.id.main_listview); 
 list = new ArrayList<>(); 
 //把扫描到的音乐赋值给list 
  list = MusicUtils.getMusicData(this); 
 adapter = new MyAdapter(this,list); 
 mListView.setAdapter(adapter); 
 } 
} 

是不是很简单，就定义一个ListView并且绑定Adapter，接下来就Adapter得编写：
[html] view plain copy
package com.duanlian.mymusicplayerdemo.adapter; 
 
import android.content.Context; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.TextView; 
 
import com.duanlian.mymusicplayerdemo.MainActivity; 
import com.duanlian.mymusicplayerdemo.R; 
import com.duanlian.mymusicplayerdemo.bean.Song; 
import com.duanlian.mymusicplayerdemo.utils.MusicUtils; 
 
import java.util.List; 
 
public class MyAdapter extends BaseAdapter { 
 private Context context; 
 private List list; 
 public MyAdapter(MainActivity mainActivity, List list) { 
 this.cOntext= mainActivity; 
 this.list = list; 
 
 } 
 
 @Override 
 public int getCount() { 
 return list.size(); 
 } 
 
 @Override 
 public Object getItem(int i) { 
 return list.get(i); 
 } 
 
 @Override 
 public long getItemId(int i) { 
 return i; 
 } 
 
 @Override 
 public View getView(int i, View view, ViewGroup viewGroup) { 
 ViewHolder holder = null; 
 if (view == null) { 
  holder = new ViewHolder(); 
  //引入布局 
  view = View.inflate(context, R.layout.item_music_listview, null); 
  //实例化对象 
  holder.sOng= (TextView) view.findViewById(R.id.item_mymusic_song); 
  holder.singer = (TextView) view.findViewById(R.id.item_mymusic_singer); 
  holder.duration = (TextView) view.findViewById(R.id.item_mymusic_duration); 
  holder.position = (TextView) view.findViewById(R.id.item_mymusic_postion); 
  view.setTag(holder); 
 } else { 
  holder = (ViewHolder) view.getTag(); 
 } 
 //给控件赋值 
 holder.song.setText(list.get(i).song.toString()); 
 holder.singer.setText(list.get(i).singer.toString()); 
 //时间需要转换一下 
 int duration = list.get(i).duration; 
 String time = MusicUtils.formatTime(duration); 
 holder.duration.setText(time); 
 holder.position.setText(i+1+""); 
 
 return view; 
 } 
 class ViewHolder{ 
 TextView song;//歌曲名 
 TextView singer;//歌手 
 TextView duration;//时长 
 TextView position;//序号 
 
 } 
 
} 

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