优化音乐播放器

添加进度条

xml代码

<?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.test7.MusicPlay1"
    android:orientation="vertical">

    <ProgressBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:id="@+id/pb"/>

    <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>

Java代码

MusicPlay1

package com.hanqi.test7;

import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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");

    }

    //媒体播放器
    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.dilemma);
        }

        mediaPlayer.start();
        mediaPlayer.isLooping();

        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
            mediaPlayer = null;//置空

        }
        tv_1.setText("播放状态：停止播放");

    }
    public void  pause_OnClick(View v)
    {
        if(mediaPlayer !=null && mediaPlayer.isPlaying())
        {
            mediaPlayer.pause();
            tv_1.setText("播放状态：播放暂停");

        }

    }
    public void exit_OnClick(View v)
    {
        stop_OnClick(v);

        finish();
    }
}

MusicPlay2

package com.hanqi.test7;

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.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MusicPlay2 extends AppCompatActivity {

    TextView tv_1;
    ProgressBar pb;

    @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1：停止");

        pb =(ProgressBar)findViewById(R.id.pb);

    }
    ServiceConnection sc;
    MusicPlayService.myBinder myBinder;

    public void play_OnClick(View v)
    {
        Intent intent = new Intent(this,MusicPlayService.class);

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

        //普通方式启动服务
        startService(intent);

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

         if(sc == null)
         {
         sc = new ServiceConnection() {
             @Override
             public void onServiceConnected(ComponentName name, IBinder service) {

                 myBinder = (MusicPlayService.myBinder)service;

                 //设置 进度条的最大长度
                 int max = myBinder.getMusicDuration();

                 pb.setMax(max);

                 //连接之后启动子线程设置当前进度
                 new Thread()
                 {
                     public void run()
                     {
                         while (true){
                         //改变当前进度值
                         pb.setProgress(myBinder.getCurrentPosition());

                             try {
                                 Thread.sleep(100);
                             }
                             catch (Exception e) {
                                 e.printStackTrace();
                             }
                         }
                     }
                 }.start();


             }

             @Override
             public void onServiceDisconnected(ComponentName name) {

             }
         };

        //以绑定方式连接服务
        bindService(intent,sc, Context.BIND_AUTO_CREATE);
        }
    }

    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");

    }

    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");
    }

    public void exit_OnClick(View v)
    {
        stop_OnClick(v);

        finish();
    }
}

MusicPlayService

package com.hanqi.test7;

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

public class MusicPlayService extends Service {
    public MusicPlayService() {
    }

    public class myBinder extends Binder
    {
        //获取歌曲的长度
        public int getMusicDuration()
        {
            int rtn = 0 ;

            if (mediaPlayer != null){
            rtn = mediaPlayer.getDuration();
            }

            return rtn;
        }

        //获取播放的进度
        public int getCurrentPosition()
        {
            int rtn = 0 ;

            if (mediaPlayer != null){

                rtn = mediaPlayer.getCurrentPosition();
            }

            return rtn;
        }
    }
    @Override
    public IBinder onBind(Intent intent) {

        return new myBinder();
    }

    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.dilemma);

                }
                mediaPlayer.start();

                break;

            case "stop":

                if(mediaPlayer != null)
                {
                    mediaPlayer.stop();
                    mediaPlayer.reset();
                    mediaPlayer.release();
                    mediaPlayer = null;
                }
                break;

            case "pause":

                if (mediaPlayer != null) {

                    mediaPlayer.pause();
                }
                break;

        }

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

实现视图效果：