音乐播放器

1.效果图:



2.项目缩略图：



3.关键代码部分

     （1）.activity_main.xml

     

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_centerVertical="true"

      

        android:layout_marginLeft="20dp"

        android:text="@string/bofang" />

    <Button

        android:id="@+id/button2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerVertical="true"

        android:layout_marginLeft="38dp"

        android:layout_toRightOf="@+id/button1"

       

        android:text="@string/tingzhi" />

</RelativeLayout>

  

     （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.qq);

  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();

   }

  }

 }

  

}

   (3).MainActivity.java

package com.example.service;

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.ImageButton;

public class MainActivity extends Activity {

 private Button kaishi=null;

 private Button tingzhi=null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        kaishi =(Button)findViewById(R.id.button2);

        tingzhi =(Button)findViewById(R.id.button1);

    }

    //开始播放音乐

    public void kaishi(View v){

     Intent intent = new Intent(MainActivity.this,AudioService.class);

     startService(intent);

    }

    //停止音乐

    public void tingzhi(View v){

     Intent intent = new Intent(MainActivity.this,AudioService.class);

     stopService(intent);

    }

   /* @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;

    }

   

}

(4.)AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.service"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="18" />

    <application

        android:allowBackup="true"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.service.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.service.AudioService"></service>

    </application>

4000

</manifest>