背景音乐

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mainActivity:

package com.example.service;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.ImageButton;

public class MainActivity extends Activity {
private ImageButton StartBtn=null;
private ImageButton StopBtn=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        StartBtn =(ImageButton)findViewById(R.id.StartBtn);
        StopBtn =(ImageButton)findViewById(R.id.StopBtn);
    }
    //开始播放音乐
    public void start(View v){
    Intent intent = new Intent(MainActivity.this,AudioService.class);
    startService(intent);
    }
    //停止音乐
    public void stop(View v){
    Intent intent = new Intent(MainActivity.this,AudioService.class);
    stopService(intent);
    }

   /* @Override
    protected void onResume() {
   super.onResume();
   startService(new Intent(this,AudioService.class));
    }
    @Override*/
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

AudioService:

package com.example.service;

/**
* 多线程实现后台播放背景音乐的service
*/
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;

public class AudioService extends Service implements
MediaPlayer.OnCompletionListener {
// 实例化MediaPlayer对象
MediaPlayer player;
private final IBinder binder = new AudioBinder();

@Override
public IBinder onBind(Intent intent) {
return binder;
}

public void onCreate() {
  super.onCreate();
  // 从raw文件夹中获取一个应用自带的mp3文件
  player = MediaPlayer.create(this, R.raw.qq);
  player.setOnCompletionListener(this);
  player.setLooping(true);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
  super.onStartCommand(intent, flags, startId);
  if (!player.isPlaying()) {
   new MusicPlayThread().start();
  }
  else player.isPlaying();
  return START_STICKY;
}

/**
* 当Audio播放完的时候触发该动作
*/
public void onCompletion(MediaPlayer mp) {
stopSelf();// 结束了，则结束Service

}

public void onDestroy() {
  super.onDestroy();
  if (player.isPlaying()) {
   player.stop();
  }
  player.release();
}

// 为了和Activity交互，我们需要定义一个Binder对象
public class AudioBinder extends Binder {
  // 返回Service对象
  public AudioService getService() {
   return AudioService.this;
  }
}

private class MusicPlayThread extends Thread {
  public void run() {
   if (!player.isPlaying()) {
    player.start();
   }
  }
}

}

activity_main.xml:

</RelativeLayout>

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