使用服务开启关闭暂停音乐

效果图

xml界面代码

<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"
    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="com.example.musicservice.MainActivity" >

    <Button
        android:id="@+id/main_start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开启" />

    <Button
        android:id="@+id/main_stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="关闭" />
	<Button 
	    android:id="@+id/main_pause"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="暂停"/>
</LinearLayout>

xml配置文件

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

    <uses-sdk
        android:minSdkVersion="8"
        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.musicservice.MusicService">
            <intent-filter>
                <action android:name="com.etc.lhm"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </service>
    </application>

</manifest>

MainActivity.java

package com.example.musicservice;

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;

public class MainActivity extends Activity implements OnClickListener {
	private Button start, stop, pause;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		start = (Button) findViewById(R.id.main_start);
		stop = (Button) findViewById(R.id.main_stop);
		pause = (Button) findViewById(R.id.main_pause);
		start.setOnClickListener(this);
		stop.setOnClickListener(this);
		pause.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		Intent intent = new Intent("com.etc.lhm");
		switch (v.getId()) {
		case R.id.main_start:
			intent.putExtra("action", "start");
			startService(intent);// 启动
			break;
		case R.id.main_stop:
			intent.putExtra("action", "stop");
			startService(intent);// 关闭
			break;
		case R.id.main_pause:
			intent.putExtra("action", "pause");
			startService(intent);
			break;
		default:
			break;
		}
	}
}

MusicService

package com.example.musicservice;

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

public class MusicService extends Service {
	// 安卓自带音乐播放器对象
	private MediaPlayer mediaPlayer;
	private boolean isPlaying;
	private boolean isPause;
	private boolean isRelease;

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

	/**
	 * 开启服务的方法
	 */
	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		String action = intent.getStringExtra("action");
		if (action.equals("start")) {
			start();
		} else if (action.equals("pause")) {
			pause();
		} else if (action.equals("stop")) {
			stop();
		}
		return super.onStartCommand(intent, flags, startId);
	}

	/**
	 * 关闭服务的方法
	 */
	@Override
	public void onDestroy() {
		super.onDestroy();
		if (mediaPlayer != null) {
			mediaPlayer.stop();
		}
	}

	public void start() {
		if (!isPlaying) {
			mediaPlayer = MediaPlayer.create(MusicService.this, R.raw.aaa);
			mediaPlayer.start();
			isPlaying = true;
			isRelease=false;
			isPause=false;
		}
	}

	public void pause() {
		if (mediaPlayer != null && !isRelease) {
			if (!isPause) {
				mediaPlayer.pause();
				isPause = true;
				isPlaying = false;
			} else {
				mediaPlayer.start();
				isPause = false;
				isPlaying=true;
			}
			isRelease=false;
		}
	}

	public void stop() {
		if (mediaPlayer != null && isPlaying) {
			if (!isRelease) {
				mediaPlayer.stop();
				mediaPlayer.release();
				isRelease = true;
			}
			isPlaying = false;
			isPause=false;
		}
	}
}