安卓音乐播放器实现代码

1. Mp3Player.java 文件package com.jacky.multimedia;import java.io.File;import java.io.FilenameFilter;import java.io.IOException;import java.util.ArrayList;import java.util.List;import android.app.ListActivity;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.Bundle;import android.os.Handler;import android.view.KeyEvent;import android.view.View;import android.widget.ArrayAdapter;import android.widget.ImageButton;import android.widget.ListView;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.TextView;public class Mp3Player extends ListActivity /* Called when the activity is first created. */* 定义5个图像按钮 */private ImageButton mFrontImageButton = null;private ImageButton mStartImageButton = null;private ImageButton mPauseImageButton = null;private ImageButton mStopImageButton = null;private ImageButton mNextImageButton = null;/*定义进度handler，显示百分比进度*/Handler mPercentHandler = new Handler();/*定义拖动条*/private SeekBar mSeekBar=null;/*定义显示文本框*/private TextView curProgressText=null;private TextView curtimeAndTotaltime=null;/* 定于一个多媒体对象*/public MediaPlayer mMediaPlayer = null;/*定于一个数据播放列表，用来存放从指定文件中搜索到的文件*/private List mMusicList = new ArrayList();/* 定义在播放列表中的当前选择项 */private int currentListItme = 0;/*定义要播放的文件夹路径*/private static final String MUSIC_PATH = new String(/mnt/sdcard/);/* Called when the activity is first created. */Overridepublic void onCreate(Bundle savedInstanceState)super.onCreate(savedInstanceState);setContentView(R.layout.main);/* 更新播放列表*/musicList();/*初始化多媒体对象*/mMediaPlayer = new MediaPlayer();/*初始化图像按钮*/mFrontImageButton = (ImageButton) findViewById(R.id.LastImageButton);mStopImageButton = (ImageButton) findViewById(R.id.StopImageButton);mStartImageButton = (ImageButton) findViewById(R.id.StartImageButton);mPauseImageButton = (ImageButton) findViewById(R.id.PauseImageButton);mNextImageButton = (ImageButton) findViewById(R.id.NextImageButton);/*初始化拖动条和当前进度显示值*/mSeekBar=(SeekBar)findViewById(R.id.SeekBar01);curProgressText=(TextView)findViewById(R.id.currentProgress);curtimeAndTotaltime=(TextView)findViewById(R.id.curtimeandtotaltime);/*监听停止按钮*/mStopImageButton.setOnClickListener(new ImageButton.OnClickListener()Overridepublic void onClick(View v)/*判断是否正在播放歌曲*/if (mMediaPlayer.isPlaying()/*如果在播放歌曲时，按下开始按钮，则重开开始播放*/mMediaPlayer.reset(););/*监听开始按钮*/mStartImageButton.setOnClickListener(new ImageButton.OnClickListener()Overridepublic void onClick(View v) /*播放当前选择歌曲，通过listView列表中onListItemClick方法得到选择的时第几项*/playMusic(MUSIC_PATH + mMusicList.get(currentListItme);/*开始播放歌曲时，同步进行更新拖动条进度*/startSeekBarUpdate(););/*监听暂停按钮*/mPauseImageButton.setOnClickListener(new ImageButton.OnClickListener()public void onClick(View view)if (mMediaPlayer.isPlaying()/*如果有播放歌曲，暂停*/mMediaPlayer.pause();else/*如果没有播放歌曲，则开始播放*/mMediaPlayer.start(););/*监听下一首按钮*/mNextImageButton.setOnClickListener(new ImageButton.OnClickListener()Overridepublic void onClick(View arg0)nextMusic(););/*监听上一首按钮*/mFrontImageButton.setOnClickListener(new ImageButton.OnClickListener()Overridepublic void onClick(View arg0)FrontMusic(););/*监听拖动条*/mSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) / TODO Auto-generated method stub/*如果拖动进度发生改变，则显示当前进度值*/curProgressText.setText(当前进度: +progress);Overridepublic void onStartTrackingTouch(SeekBar seekBar) / TODO Auto-generated method stubcurProgressText.setText(拖动中.);Overridepublic void onStopTrackingTouch(SeekBar seekBar) / TODO Auto-generated method stubint dest = seekBar.getProgress();int mMax = mMediaPlayer.getDuration();int sMax = mSeekBar.getMax();mMediaPlayer.seekTo(mMax*dest/sMax););/*按键处理时间,当按下返回按键时的处理方法*/public boolean onKeyDown(int keyCode, KeyEvent event)if ( keyCode = KeyEvent.KEYCODE_BACK)mMediaPlayer.stop();mMediaPlayer.release();this.finish();return true;return super.onKeyDown(keyCode, event);/*ListView选择项监听方法，即当前鼠标在列表中选择的第几项*/protected void onListItemClick(ListView l, View v, int position, long id)currentListItme = position;playMusic(MUSIC_PATH + mMusicList.get(position);/*更新播放列表*/public void musicList()/*从指定的路径中读取文件，并与播放列表关联*/File home = new File(MUSIC_PATH);/*读取指定类型的文件，在本程序，指定播放类型为mp3*/if (home.listFiles(new MusicFilter().length 0)/*读取文件*/for (File file : home.listFiles(new MusicFilter()mMusicList.add(file.getName();/*播放文件与播放列表关联*/ArrayAdapter musicList = new ArrayAdapter(Mp3Player.this,R.layout.musicitme, mMusicList);setListAdapter(musicList);/*播放指定路径中的音乐*/private void playMusic(String path)try/* 重置多媒体 */mMediaPlayer.reset();/*读取mp3文件*/mMediaPlayer.setDataSource(path);/*准备播放*/mMediaPlayer.prepare();/*开始播放*/mMediaPlayer.start();/*监听播放是否完成*/mMediaPlayer.setOnCompletionListener(new OnCompletionListener()public void onCompletion(MediaPlayer arg0)/*播放完当前歌曲，自动播放下一首*/nextMusic(););catch (IOException e)/*播放下一首*/private void nextMusic()if (+currentListItme = mMusicList.size()currentListItme = 0;elseplayMusic(MUSIC_PATH + mMusicList.get(currentListItme);/*播放上一首歌曲*/private void FrontMusic()if (-currentListItme = 0)currentListItme = 0;elseplayMusic(MUSIC_PATH + mMusicList.get(currentListItme);/*更新拖动条进度*/public void startSeekBarUpdate()mPercentHandler.post(start);Runnable start=new Runnable()Overridepublic void run() / TODO Auto-generated method stubmPercentHandler.post(updatesb);/用一个handler更新SeekBar;Runnable updatesb =new Runnable()Overridepublic void run() / TODO Auto-generated method stubint position = mMediaPlayer.getCurrentPosition(); int mMax = mMediaPlayer.getDuration();int sMax = mSeekBar.getMax(); mSeekBar.setProgress(position*sMax/mMax);curtimeAndTotalt