android 背景音乐的播放

运行效果图如下

一、布局文件

actity_ main.xml

在自己新建的文件夹raw下导入当做背景音乐的歌曲

二、java代码

1、MainActivitiy.java

package com.example.service;

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


public class MainActivity extends Activity {


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

}


@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;
}

}

2、AudioService.java

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.lunsang);
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();
}
}
}

}

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