android音乐播放器

1. 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<String> mMusicList = new ArrayList<String>();
   
   /* 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. */
   @Override
   public 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() 
   {
   @Override
   public 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() 
   {
   @Override
   public 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() 
   {
   @Override
   public void onClick(View arg0)
   {   
   nextMusic();
   }
   });
   /*监听上一首按钮*/
   mFrontImageButton.setOnClickListener(new ImageButton.OnClickListener() 
   {
   @Override
   public 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);    
   }
   
   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {
   // TODO Auto-generated method stub
   curProgressText.setText("拖动中...");
   }
   
   @Override
   public void onStopTrackingTouch(SeekBar seekBar) {
   // TODO Auto-generated method stub
   int 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<String> musicList = new ArrayAdapter<String>(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;
   }
   else
   {
   playMusic(MUSIC_PATH + mMusicList.get(currentListItme));
   }
   }
   
   
   
   /*播放上一首歌曲*/
   private void FrontMusic()
   {
   if (--currentListItme >= 0)
   {
   currentListItme = 0;
   }
   else
   {
   playMusic(MUSIC_PATH + mMusicList.get(currentListItme));
   }
   }
   
   /*更新拖动条进度*/
   
   public void startSeekBarUpdate()
   {
   mPercentHandler.post(start);
   }
   
   Runnable start=new Runnable(){
   
   @Override
   public void run() {
   // TODO Auto-generated method stub
   mPercentHandler.post(updatesb);
   //用一个handler更新SeekBar
   }
   
   };
   
   Runnable updatesb =new Runnable(){
   
   @Override
   public void run() {
   // TODO Auto-generated method stub
   int position = mMediaPlayer.getCurrentPosition();               
   int mMax = mMediaPlayer.getDuration();
   int sMax = mSeekBar.getMax();             
   mSeekBar.setProgress(position*sMax/mMax);
   curtimeAndTotaltime.setText("当前播放时间： "+position/1000+"秒"+"\n歌曲总时间: "+mMax/1000+"秒");
   mPercentHandler.postDelayed(updatesb, 1000);
   //每秒钟更新一次
   }
   
   };
   
   }
   
   /*播放文件选择类*/
   class MusicFilter implements FilenameFilter
   {
   public boolean accept(File dir, String name)
   {
   /*指定扩展名类型*/
   return (name.endsWith(".mp3"));
   }
   }
   
   
   2.main.xls文件
   
   <?xml version="1.0" encoding="utf-8"?>
   <AbsoluteLayout 
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   >
   <ListView 
   android:id="@id/android:list"  
   android:layout_width="fill_parent" 
   android:layout_height="fill_parent"
   android:layout_weight="1"
   android:drawSelectorOnTop="false"/>
   <ImageButton
   android:id="@+id/LastImageButton"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"  
   android:layout_x="10px"
   android:layout_y="70px"
   android:src="@drawable/last"  
   />
   <ImageButton
   android:id="@+id/StopImageButton" 
   android:layout_height="wrap_content"  
   android:layout_width="wrap_content"
   android:layout_x="70px"
   android:layout_y="70px"
   android:src="@drawable/stop" 
   />  
   <ImageButton
   android:id="@+id/StartImageButton" 
   android:layout_height="wrap_content"  
   android:layout_width="wrap_content" 
   android:layout_x="130px"
   android:layout_y="70px"
   android:src="@drawable/start" 
   />
   <ImageButton
   android:id="@+id/PauseImageButton" 
   android:layout_height="wrap_content"  
   android:layout_width="wrap_content" 
   android:layout_x="190px"
   android:layout_y="70px" 
   android:src="@drawable/pause" 
   />  
   <ImageButton
   android:id="@+id/NextImageButton"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content" 
   android:layout_x="250px"
   android:layout_y="70px"
   android:src="@drawable/next"  
   />
   <SeekBar android:id="@+id/SeekBar01" 
   android:layout_height="wrap_content" 
   android:layout_x="0dp" 
   android:layout_y="200dp" 
   android:layout_width="fill_parent" 
   android:max="100" 
   android:progress="0" 
   android:secondaryProgress="50" 
   android:visibility="visible"></SeekBar>
   
   <TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_y="250dp" android:id="@+id/currentProgress"></TextView>
   
   <TextView android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_y="300dp" android:id="@+id/curtimeandtotaltime"></TextView>
   </AbsoluteLayout>
   
   

 

 

 

 

 

 

3.musictime.xls

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/TextView01"
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:text="@string/hello"/>

4.AndroidManifest.xls

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jacky.multimedia"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Mp3Player"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

</application>
<uses-sdk android:minSdkVersion="3" />

</manifest>