23 服务音乐的启动Demo4

注意如果音乐服务和Activity在一个应用中那么将不会因为绑定的Activity销毁而关闭音乐

MainActivity.java

package com.qf.day23_service_demo4;

import com.qf.day23_service_demo4.MyMusicService.MyBinder;

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

public class MainActivity extends Activity {

    private MyMusicService musicService;
    private MyServiceConn conn;

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

        conn = new MyServiceConn();
    }

    public void MyClick(View v){
        switch (v.getId()) {
        case R.id.btn_play://播放
            if(musicService!=null){
                musicService.playMusic();
            }else{
                Intent intent = new Intent(MainActivity.this, MyMusicService.class);
                bindService(intent, conn, Context.BIND_AUTO_CREATE);
            }

            break;
        case R.id.btn_pause://暂停
            if(musicService!=null){
                musicService.pauseMusic();
            }
            break;
        case R.id.btn_stop://停止
            if(musicService!=null){
                musicService.stopMusic();
                musicService =null;
                unbindService(conn);
            }
            break;

        default:
            break;
        }
    }


    public class MyServiceConn implements ServiceConnection{

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // TODO Auto-generated method stub
            MyBinder myBinder = (MyBinder) service;
            musicService = myBinder.getMyMusicService();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO Auto-generated method stub
            conn = null;
        }

    }
}

MyMusicService.java

package com.qf.day23_service_demo4;

import java.io.IOException;

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

public class MyMusicService extends Service{


    private MediaPlayer mediaPlayer;//媒体操作对象

    private int pos=0;//每次暂停的位置

    @Override
    public IBinder onBind(Intent intent) {
        playMusic();//绑定时 开始播放音乐
        return new MyBinder();
    }

    //传递Service对象 
    public class MyBinder extends Binder{
        public MyMusicService getMyMusicService(){
            return MyMusicService.this;
        }
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        if(mediaPlayer == null){
            //初始化媒体对象   将资源文件设置给mediaPlayer
            mediaPlayer = MediaPlayer.create(MyMusicService.this, R.raw.heavencity);
        }
        //播放完毕的监听  
        mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {
                mediaPlayer.release();//是放资源
            }
        });
    }

    //播放
    public void playMusic(){
        if(mediaPlayer!=null&&!mediaPlayer.isPlaying()){
            try {
                if(pos!=0){//从暂停到开始
                    mediaPlayer.seekTo(pos);//播放位置 移动到  暂停位置
                    mediaPlayer.start();
                }else{//开始
                    mediaPlayer.stop();//暂停
                    mediaPlayer.prepare();//进行准备   必须写的
                    mediaPlayer.start();
                }


            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }

    }

    //暂停
    public void pauseMusic(){

        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            pos = mediaPlayer.getCurrentPosition();//获取播放的位置
            mediaPlayer.pause();
        }

    }

    //停止
    public void stopMusic(){

        if(mediaPlayer!=null){
            mediaPlayer.stop();
            mediaPlayer.reset();//资源重置
        }

    }

    @Override
    public boolean onUnbind(Intent intent) {
        // TODO Auto-generated method stub
        return super.onUnbind(intent);
    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }

}

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.qf.day23_service_demo4"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.qf.day23_service_demo4.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service android:name=".MyMusicService"></service>
    </application>

</manifest>