界面：
主要代码： 1.定义一个工具类，在这个类中获取音频文件，并且对歌曲名、歌手和时间等进行格式规范： package com.example.administrator.music;import android.content.Context;import android.database.Cursor;import android.provider.MediaStore;import java.util.ArrayList;import java.util.List;/** * Created by liuliu on 2018/1/14. *///工具类public class Utils { //定义一个集合，存放从本地读取到的内容 public static List list; public static Song song; public static List getmusic(Context context) { list = new ArrayList<>(); 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 = 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));// 把歌曲名字和歌手切割开 if (song.size > 1000 * 800) { if (song.song.contains("-")) { String[] str = song.song.split("-"); song.singer = str[0]; song.song = str[1]; } list.add(song); } } } cursor.close(); return list; } // 转换歌曲时间的格式 public static String formatTime(int time) { if (time / 1000 % 60 < 10) { String tt = time / 1000 / 60 + ":0" + time / 1000 % 60; return tt; } else { String tt = time / 1000 / 60 + ":" + time / 1000 % 60; return tt; } }} 2.定义一个布局text.xml用于展示每一个音频文件的内容，使用适配器把把内容映射到主布局文件中的ListView中去：
class MyAdapter extends BaseAdapter { Context context; 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) { Myholder myholder; if (view == null) { myholder = new Myholder(); view = LayoutInflater.from(getApplicationContext()).inflate(R.layout.text, null); myholder.t_position = view.findViewById(R.id.t_postion); myholder.t_song = view.findViewById(R.id.t_song); myholder.t_singer = view.findViewById(R.id.t_singer); myholder.t_duration = view.findViewById(R.id.t_duration); view.setTag(myholder); } else { myholder = (Myholder) view.getTag(); } myholder.t_song.setText(list.get(i).song.toString()); myholder.t_singer.setText(list.get(i).singer.toString()); String time = Utils.formatTime(list.get(i).duration); myholder.t_duration.setText(time); myholder.t_position.setText(i + 1 + ""); return view; } class Myholder { TextView t_position, t_song, t_singer, t_duration; } } 3.定义播放play()、暂停pause()、停止stop()和循环播放loop()方法:
public void play(String path) { try { // 重置音频文件，防止多次点击会报错 mediaPlayer.reset(); // 调用方法传进播放地址 mediaPlayer.setDataSource(path); // 异步准备资源，防止卡顿 mediaPlayer.prepareAsync(); // 调用音频的监听方法，音频准备完毕后响应该方法进行音乐播放 mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { @Override public void onPrepared(MediaPlayer mediaPlayer) { mediaPlayer.start(); //设置循环播放。 loop(); } }); } catch (Exception e) { e.printStackTrace(); } } protected void play1() { mediaPlayer.start(); //设置循环播放。 loop(); } protected void pause() { mediaPlayer.pause(); button2.setEnabled(true); button2.setBackgroundColor(getResources().getColor(R.color.colorPrimary)); } protected void stop() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.stop(); mediaPlayer.release(); mediaPlayer = null; button2.setEnabled(true); Toast.makeText(this, "停止播放", Toast.LENGTH_LONG).show(); } } protected void loop(){ mediaPlayer.setLooping(true);} 4.给按钮添加点击事件：
class myListener implements View.OnClickListener { @Override public void onClick(View v) { switch (v.getId()) { case R.id.button2: //避免重复播放，把播放按钮设置为不可用 button2.setEnabled(false); button2.setBackgroundColor(Color.GRAY); //String p0 = list.get(current).path;//获得歌曲的地址 if(one<1) { String p = list.get(current).path; play(p); one++; } else { play1(); } break; case R.id.button3: pause(); break; case R.id.button1: if (current > 0) { current = current - 1; String p1 = list.get(current).path;//获得歌曲的地址 play(p1); } else { current = list.size() - 1; String p1 = list.get(current).path;//获得歌曲的地址 play(p1); } break; case R.id.button4: if (current + 1 < list.size()) { current = current + 1; String p2 = list.get(current).path;//获得歌曲的地址 play(p2); } else { current = 0; String p2 = list.get(current).path;//获得歌曲的地址 play(p2); } break; case R.id.button5: stop(); default: break; } } } 代码：
app: