安卓：bindService播放指定音乐

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逻辑代码文件：

<span style="font-size:18px;">package com.example.day22_music;

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;

import com.example.day22_music.MusicService.MyBind;

public class MainActivity extends Activity {

	MusicService musicService;
	MyConn conn=new MyConn();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    
    }

    public void click(View v)
    {
    	switch(v.getId())
    	{
    	case R.id.bt1:
    		if(musicService==null)
    		{
    			Intent intent=new Intent(MainActivity.this,MusicService.class);
    			bindService(intent, conn, Context.BIND_AUTO_CREATE);
    		}
    		else
    		{
    			musicService.play();
    		}
    		break;
    	case R.id.bt2:
    		if(musicService!=null)
    		{
    			musicService.pause();
    		}
    		break;
    	case R.id.bt3:
    		if(musicService!=null)
    		{
    			musicService.stop();
    			musicService=null;
    			unbindService(conn);
    		}
    		break;
    	}
    }
    class MyConn implements ServiceConnection
    {
		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			MyBind mb= (MyBind) service;
			musicService=mb.getService();
		}

		@Override
		public void onServiceDisconnected(ComponentName name) {
			conn=null;
		}
    	
    }
}
</span>

服务类文件：

<span style="font-size:18px;">package com.example.day22_music;

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 MusicService extends Service{

	MediaPlayer mediaPlayer;//声明操作媒体的对象
	int pos=0;//记录播放的位置
	@Override
	public IBinder onBind(Intent intent) {
		play();//绑定时进行播放
		return new MyBind();
	}
	
	class MyBind extends Binder
	{
		public MusicService getService()
		{
			return MusicService.this;
		}
	}
	
	@Override
	public void onCreate() {
		super.onCreate();
		if(mediaPlayer==null)
		{
			mediaPlayer=mediaPlayer.create(MusicService.this, R.raw.heavencity);
			mediaPlayer.setLooping(false);//设置不需要单曲循环
		}
		//播放完毕 进行监听回调
		mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
			
			@Override
			public void onCompletion(MediaPlayer mp) {
				mediaPlayer.release();//释放资源
			}
		});
	}
	public void play()
	{
		if(mediaPlayer!=null&&!mediaPlayer.isPlaying())
		{
			try 
			{
				if(pos!=0)
				{
					//根据指定位置进行播放
					mediaPlayer.seekTo(pos);
					mediaPlayer.start();
				}
				else
				{
					//从头播放
					mediaPlayer.stop();
					mediaPlayer.prepare();//启动之前必须prepare
					mediaPlayer.start();
				}
			} 
			catch (Exception e)
			{
				e.printStackTrace();
			}
		}
		else
		{
			
		}
	}
	
	public void pause()
	{
		if(mediaPlayer!=null&&mediaPlayer.isPlaying())
		{
			pos=mediaPlayer.getCurrentPosition();
			mediaPlayer.pause();
		}
	}
	
	public void stop()
	{
		if(mediaPlayer!=null)
		{
			mediaPlayer.stop();
			mediaPlayer.reset();
		}
	}
	
}
</span>

布局文件：

<span style="font-size:18px;"><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">

    <TextView 
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:gravity="center"
        android:background="#00ff00"/>
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
        android:id="@+id/bt1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="播放音乐" 
        android:onClick="click"/>
    <Button
        android:id="@+id/bt2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="暂停音乐" 
        android:onClick="click"/>
    <Button
        android:id="@+id/bt3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="停止音乐" 
        android:onClick="click"/>
    </LinearLayout>
    

</LinearLayout></span>