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

<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: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.hanqi.test2.MusicPlay1"

    android:orientation="vertical">

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="播放状态："

        android:id="@+id/tv_1"/>

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content">

        <Button

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="播放"

            android:onClick="play_onclick"/>

        <Button

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="暂停"

            android:onClick="pause_onclick"/>

        <Button

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="停止"

            android:onClick="stop_onclick"/>

        <Button

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:text="退出"

            android:onClick="exit_onclick"/>

    </LinearLayout>

</LinearLayout>

package com.hanqi.test2;

import android.media.MediaPlayer;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.TextView;

public class MusicPlay1 extends AppCompatActivity {

    TextView tv_1;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_music_play1);

        tv_1 =(TextView)findViewById(R.id.tv_1);

        tv_1.setText("播放状态:停止播放");

    }

    //媒体播放器的类

    private MediaPlayer mediaPlayer;

    public void play_onclick(View v)

    {

        if (mediaPlayer == null) {

            //调用MediaPlayer的静态方法create()

            mediaPlayer = MediaPlayer.create(this, R.raw.love);

        }

        mediaPlayer.start();

        tv_1.setText("播放状态:正在播放...");

    }

    public void stop_onclick(View v)

    {

        if (mediaPlayer != null) {

            mediaPlayer.stop();  //停止

            mediaPlayer.reset();  //重置

            mediaPlayer.release();  //释放资源

            mediaPlayer = null;  //赋空

        }

        tv_1.setText("播放状态:停止播放");

    }

    public void pause_onclick(View v)

    {

        //isPlaying:状态

        if (mediaPlayer != null && mediaPlayer.isPlaying())

        {

            mediaPlayer.pause();

            tv_1.setText("播放状态:暂停播放");

        }

    }

    public void exit_onclick(View v)

    {

        stop_onclick(v);

        finish();

    }

}

package com.hanqi.test2;

import android.content.Intent;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.TextView;

public class MusicPlay2 extends AppCompatActivity {

    TextView tv_1;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_music_play1);

        tv_1 =(TextView)findViewById(R.id.tv_1);

        tv_1.setText("播放状态:停止播放");

    }

    public void play_onclick(View v)

    {

        Intent intent = new Intent(this,MusicPlayService.class);

        intent.putExtra("action","play");

        startService(intent);

        tv_1.setText("播放状态1:正在播放...");

    }

    public void stop_onclick(View v)

    {

        Intent intent = new Intent(this,MusicPlayService.class);

        intent.putExtra("action","stop");

        startService(intent);

        tv_1.setText("播放状态1:停止播放");

    }

    public void pause_onclick(View v)

    {

        Intent intent = new Intent(this,MusicPlayService.class);

        intent.putExtra("action","pause");

        startService(intent);

        tv_1.setText("播放状态1:暂停播放");

    }

    public void exit_onclick(View v)

    {

        stop_onclick(v);

        finish();

    }

}

package com.hanqi.test2;

import android.app.Service;

import android.content.Intent;

import android.media.MediaPlayer;

import android.os.IBinder;

public class MusicPlayService extends Service {

    public MusicPlayService() {

    }

    @Override

    public IBinder onBind(Intent intent) {

        // TODO: Return the communication channel to the service.

        throw new UnsupportedOperationException("Not yet implemented");

    }

    private MediaPlayer mediaPlayer;

    @Override

    public int onStartCommand(Intent intent, int flags, int startId) {

        //获取意图传递的信息

        String action = intent.getStringExtra("action");

        switch (action)

        {

            case "play":

                if (mediaPlayer == null)

                {

                    mediaPlayer = MediaPlayer.create(this,R.raw.love);

                }

                mediaPlayer.start();

                break;

            case "stop":

                if (mediaPlayer != null)

                {

                    mediaPlayer.stop();

                    mediaPlayer.reset();

                    mediaPlayer.release();

                    mediaPlayer = null;

                }

                break;

            case "pause":

                mediaPlayer.pause();

                break;

        }

        return super.onStartCommand(intent, flags, startId);

    }

}