用service实现音乐播放器

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MainActivity.java

package com.example.musicplayservice;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;/*以service实现的简单的播放MP3功能 * 需要在res/raw中添加MP3文件 * 需要在andoridMainfeist中注册service以及aciton * */public class MainActivity extends Activity {    private Button mBtn_play;    private Button mBtn_stop;//  定义一个Action    private String MusicAciton = "com.example.service.action.MUSIC_SERVICE";               @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mBtn_play = (Button) findViewById(R.id.btn_play);        mBtn_stop = (Button) findViewById(R.id.btn_stop);        mBtn_play.setOnClickListener(new PlayBtnListener());        mBtn_stop.setOnClickListener(new StopBtnListener());    }//  播放按钮//  实现这个类时,首先执行的是service.create的方法,然后执行service.start方法,    class PlayBtnListener implements OnClickListener{        @Override        public void onClick(View v) {            // TODO Auto-generated method stub            Intent intent_play = new Intent(MusicAciton);            intent_play.setClass(MainActivity.this, MusicPlayService.class);//          启动服务            startService(intent_play);        }    }//  停止播放并退出按钮//  实现这个类时,执行的是service.destroy方法    class StopBtnListener implements OnClickListener{        @Override        public void onClick(View v) {            // TODO Auto-generated method stub            Intent intent_stop = new Intent(MusicAciton);            intent_stop.setClass(MainActivity.this, MusicPlayService.class);//          停止服务            stopService(intent_stop);//          退出程序            finish();        }    }}

MusicPlayerService.java

package com.example.musicplayservice;import android.app.Service;import android.content.Intent;import android.media.MediaPlayer;import android.os.IBinder;import android.util.Log;import android.view.View.OnCreateContextMenuListener;public class MusicPlayService extends Service {    private MediaPlayer MusicPlayer = null;    private String TAG = "MusicPlay";    @Override    public IBinder onBind(Intent intent) {        // TODO Auto-generated method stub        Log.i(TAG, "onBind");        return null;    }    @Override    public void onCreate() {        // TODO Auto-generated method stub        super.onCreate();        Log.i(TAG, "onCreate");    }    @Override    public void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();        MusicPlayer.stop();    }    @Override    public void onStart(Intent intent, int startId) {        // TODO Auto-generated method stub        super.onStart(intent, startId);        Log.i(TAG, "onStart");//      创建一个Mediaplayer实例        MusicPlayer = MediaPlayer.create(this, R.raw.sky);//      播放        MusicPlayer.start();    }}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button         android:id="@+id/btn_play"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/btn_play"/>    <Button         android:id="@+id/btn_stop"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/btn_stop"/></LinearLayout>

androidMainfeist.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.musicplayservice"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="14"        android:targetSdkVersion="21" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".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="com.example.musicplayservice.MusicPlayService">            <intent-filter >                <action android:name="com.example.service.Action.MUSIC_SERVICE"/>                <category android:name="android.intent.category.DEFAULT"/>            </intent-filter>        </service>    </application></manifest>

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