android四大组件之Service 播放音乐

首先定义接口

package com.example.musicplay;

public interface PlayInterface {
    void play();
    void playContiue();
    void pause();
}

package com.example.musicplay;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;

public class PlayService extends Service {
    private MediaPlayer mediaPlayer;
    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        return new MusicBinder();
    }
    class MusicBinder extends Binder implements PlayInterface{

        @Override
        public void play() {
            // TODO Auto-generated method stub
            PlayService.this.play();
        }

        @Override
        public void playContiue() {
            // TODO Auto-generated method stub
            PlayService.this.playContiue();
        }

        @Override
        public void pause() {
            // TODO Auto-generated method stub
            PlayService.this.pause();
            
        }
        
    }
    @Override
    public void onCreate() {
        mediaPlayer = new MediaPlayer();
    }
    
    private void play(){
        //重置
        mediaPlayer.reset();
        try {
            mediaPlayer.setDataSource("sdcard/Charlotte Perrelli - Hero.mp3");
            //准备
            mediaPlayer.prepare();
        } catch (Exception e) {
            // TODO Auto-generated catcssh block
            e.printStackTrace();
        }
        mediaPlayer.start();
    }
    private void playContiue(){
        mediaPlayer.start();
    }
    private void pause(){
        mediaPlayer.pause();
    }
}

package com.example.musicplay;

import android.os.Bundle;
import android.os.IBinder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity {
    private PlayInterface p;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent intent = new Intent(this,PlayService.class);
        startService(intent);
        bindService(intent, new Conn(), BIND_AUTO_CREATE);
        
        findViewById(R.id.paly).setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                p.play();
                
            }
        });
        findViewById(R.id.contiue).setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                p.playContiue();
                
            }
        });
        findViewById(R.id.pause).setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                p.pause();
            }
        });
    }
    class Conn implements ServiceConnection{

        @Override
        public void onServiceConnected(ComponentName arg0, IBinder arg1) {
            // TODO Auto-generated method stub
            p = (PlayInterface) arg1;
        }

        @Override
        public void onServiceDisconnected(ComponentName arg0) {
            // TODO Auto-generated method stub
            
        }
        
    }


}