23 服务音乐的启动Demo4

来源：互联网发布：义乌淘宝村编辑：程序博客网时间：2024/05/29 15:19

这里写图片描述

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>

0 0