<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:orientation="vertical"
 android:layout_height="wrap_content">
 <Button android:text="播放" android:id="@+id/btnStart"
    android:layout_width="fill_parent" android:layout_height="wrap_content">
  </Button>
  <Button android:text="停止" android:id="@+id/btnStop"
    android:layout_width="fill_parent" android:layout_height="wrap_content">
  </Button>
</LinearLayout>

/**
 *
 */
package com.demo.media;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import com.demo.HelloWorld.R;
/**
 * @author xsl
 * vaiyanzi@gmail.com
 * 实现MP3播放功能
 */
public class mediademo extends Activity {
  private Button btnStart,btnStop;
  private static MediaPlayer mediaPlayer=null;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.media);
    btnStart = (Button) this.findViewById(R.id.btnStart);
    btnStart.setOnClickListener(new ButtonListener());
    btnStop = (Button) this.findViewById(R.id.btnStop);
    btnStop.setOnClickListener(new ButtonListener());
  }
  class ButtonListener implements OnClickListener{
    public void onClick(View v) {
      switch(v.getId()){
      case R.id.btnStart:
        if(mediaPlayer==null){
          //创建播放实例
          mediaPlayer=MediaPlayer.create(mediademo.this, R.raw.tishiyin);
        }
        try {
          //设置是否循环播放
          mediaPlayer.setLooping(true);
          //设置播放起始点
          mediaPlayer.seekTo(0);
          //开始播放
          mediaPlayer.start();
        } catch (IllegalStateException e) {
          e.printStackTrace();
        } catch (Exception e) {
          e.printStackTrace();
        }
        break;
      case R.id.btnStop:
        if(mediaPlayer!=null){
          //停止播放
          mediaPlayer.stop();
          //释放资源
          mediaPlayer.release();
          mediaPlayer=null;
        }
        break;
      }
    }
  }
}