android 播放音乐示例

   这个例子是播放音乐的一个小例子也比较简单，大家需要去下载2个.mp3结尾的歌曲，然后放到SD卡里边 进行测试，就可以看到效果了。 运行效果如下



main.xml

<?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"  
  />
</AbsoluteLayout>

musicitme.xml

<?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"/>

只有一个类 Activity01

package com.yarin.android.Examples_07_01;

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.view.KeyEvent;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;

public class Activity01 extends ListActivity 
{
	/* 几个操作按钮 */
	private ImageButton	mFrontImageButton	= null;
	private ImageButton	mStopImageButton	= null;
	private ImageButton	mStartImageButton	= null;
	private ImageButton	mPauseImageButton	= null;
	private ImageButton	mNextImageButton	= null;

	/* MediaPlayer对象 */
	public MediaPlayer	mMediaPlayer		= null;
	
	/* 播放列表 */
	private List<String> mMusicList = new ArrayList<String>();
	
	/* 当前播放歌曲的索引 */
	private int currentListItme = 0;
	
	/* 音乐的路径 */
	private static final String MUSIC_PATH = new String("/sdcard/");

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		/* 更新显示播放列表 */
		musicList();
		/* 构建MediaPlayer对象 */
		mMediaPlayer		= new MediaPlayer();

		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); 
		
		//停止按钮
		mStopImageButton.setOnClickListener(new ImageButton.OnClickListener() 
		{
			@Override
			public void onClick(View v)
			{
				/* 是否正在播放 */
				if (mMediaPlayer.isPlaying())
				{
					//重置MediaPlayer到初始状态
					mMediaPlayer.reset();
				}
			}
		}); 
		
		//开始按钮
		mStartImageButton.setOnClickListener(new ImageButton.OnClickListener() 
		{
			@Override
			public void onClick(View v)
			{
				playMusic(MUSIC_PATH + mMusicList.get(currentListItme));
			}
		});  
		
		//暂停
		mPauseImageButton.setOnClickListener(new ImageButton.OnClickListener() 
		{
			public void onClick(View view)
			{
				if (mMediaPlayer.isPlaying())
				{
					/* 暂停 */
					mMediaPlayer.pause();
				}
				else 
				{
					/* 开始播放 */
					mMediaPlayer.start();
				}
			}
		});
		
		//下一首
		mNextImageButton.setOnClickListener(new ImageButton.OnClickListener() 
		{
			@Override
			public void onClick(View arg0)
			{
				nextMusic();
			}
		});
		//上一首
		mFrontImageButton.setOnClickListener(new ImageButton.OnClickListener() 
		{
			@Override
			public void onClick(View arg0)
			{
				FrontMusic();
			}
		});
	}
	
	/*<----------------------------------------------------------------->*/
	
	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);
	}
	
	
	@Override
	/* 当我们点击列表时，播放被点击的音乐 */
	protected void onListItemClick(ListView l, View v, int position, long id)
	{
		currentListItme = position;
		playMusic(MUSIC_PATH + mMusicList.get(position));
	}


	/* 播放列表 */
	public void musicList()
	{
		//取得指定位置的文件设置显示到播放列表
		File home = new File(MUSIC_PATH);
		if (home.listFiles(new MusicFilter()).length > 0)
		{
			for (File file : home.listFiles(new MusicFilter()))
			{
				mMusicList.add(file.getName());
			}
			ArrayAdapter<String> musicList = new ArrayAdapter<String>(Activity01.this,R.layout.musicitme, mMusicList);
			setListAdapter(musicList);
		}
	}
	
	private void playMusic(String path)
	{
		try
		{
			/* 重置MediaPlayer */
			mMediaPlayer.reset();
			/* 设置要播放的文件的路径 */
			mMediaPlayer.setDataSource(path);
			/* 准备播放 */
			mMediaPlayer.prepare();
			/* 开始播放 */
			mMediaPlayer.start();
			mMediaPlayer.setOnCompletionListener(new OnCompletionListener() 
			{
				public void onCompletion(MediaPlayer arg0)
				{
					//播放完成一首之后进行下一首
					nextMusic();
				}
			});
		}catch (IOException e){}
	}

	/* 下一首 */
	private void nextMusic()
	{
		if (++currentListItme >= mMusicList.size())
		{
			currentListItme = 0;
		}
		else
		{
			playMusic(MUSIC_PATH + mMusicList.get(currentListItme));
		}
	}
	
	/* 上一首 */
	private void FrontMusic()
	{
		if (--currentListItme >= 0)
		{
			currentListItme = mMusicList.size();
		}
		else
		{
			playMusic(MUSIC_PATH + mMusicList.get(currentListItme));
		}
	}

}

/* 过滤文件类型 */
class MusicFilter implements FilenameFilter
{
	public boolean accept(File dir, String name)
	{
		//这里还可以设置其他格式的音乐文件
		return (name.endsWith(".mp3"));
	}
}

  源码见附件，大家需要下载2首.mp3 结尾的歌曲进行测试