Android编程开发音乐播放器实例

本文实例讲述了android编程开发音乐播放器，分享给大家供大家参考，具体如下：

音乐播放器中综合了以下内容：

seekbar、listview、广播接收者(以代码的形式注册receiver)、系统服务、mediaplayer

实现的功能：

1.暂停/播放、下一首/上一首，点击某一首时播放
2.支持拖动进度条快进
3.列表排序
4.来电话时，停止播放，挂断后继续播放
5.可在后台播放

效果图：

界面：

main.xml：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
  <textview
    android:id="@+id/name"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    />
  <seekbar
    android:id="@+id/seekbar"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginbottom="5dp"
    />
  <linearlayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginbottom="20dp"
    >
    <button
      android:layout_width="40dp"
      android:layout_height="40dp"
      android:text="|◀"
      android:onclick="previous"
      />
    <button
      android:id="@+id/pp"
      android:layout_width="40dp"
      android:layout_height="40dp"
      android:text="▶"
      android:onclick="pp"
      />
    <button
      android:layout_width="40dp"
      android:layout_height="40dp"
      android:text="▶|"
      android:onclick="next"
      />
  </linearlayout>
  <listview
    android:id="@+id/list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    />
</linearlayout>

item.xml：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:padding="10dp"
  >
  <textview
    android:id="@+id/mname"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textsize="15sp"
    />
</linearlayout>

mainactivity:

package cn.test.audio;
import java.io.file;
import java.util.arraylist;
import java.util.collections;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import android.app.activity;
import android.content.broadcastreceiver;
import android.content.context;
import android.content.intent;
import android.content.intentfilter;
import android.media.mediaplayer;
import android.media.mediaplayer.oncompletionlistener;
import android.os.bundle;
import android.os.environment;
import android.os.handler;
import android.telephony.phonestatelistener;
import android.telephony.telephonymanager;
import android.view.view;
import android.widget.adapterview;
import android.widget.button;
import android.widget.listview;
import android.widget.seekbar;
import android.widget.simpleadapter;
import android.widget.textview;
import android.widget.adapterview.onitemclicklistener;
import android.widget.seekbar.onseekbarchangelistener;
public class mainactivity extends activity {
  private textview nametextview;
  private seekbar seekbar;
  private listview listview;
  private list<map<string, string>> data;
  private int current;
  private mediaplayer player;
  private handler handler = new handler();
  private button ppbutton;
  private boolean ispause;
  private boolean isstarttrackingtouch;
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.main);
    nametextview = (textview) findviewbyid(r.id.name);
    seekbar = (seekbar) findviewbyid(r.id.seekbar);
    listview = (listview) findviewbyid(r.id.list);
    ppbutton = (button) findviewbyid(r.id.pp);
    //创建一个音乐播放器
    player = new mediaplayer();
    //显示音乐播放列表
    generatelistview();
    //进度条监听器
    seekbar.setonseekbarchangelistener(new myseekbarlistener());
    //播放器监听器
    player.setoncompletionlistener(new myplayerlistener());
    //意图过滤器
    intentfilter filter = new intentfilter();
    //播出电话暂停音乐播放
    filter.addaction("android.intent.action.new_outgoing_call");
    registerreceiver(new phonelistener(), filter);
    //创建一个电话服务
    telephonymanager manager = (telephonymanager) getsystemservice(telephony_service);
    //监听电话状态，接电话时停止播放
    manager.listen(new myphonestatelistener(), phonestatelistener.listen_call_state);
  }
  /*
   * 监听电话状态
   */
  private final class myphonestatelistener extends phonestatelistener {
    public void oncallstatechanged(int state, string incomingnumber) {
      pause();
    }
  }
  /*
   * 播放器监听器
   */
  private final class myplayerlistener implements oncompletionlistener {
    //歌曲播放完后自动播放下一首歌曲
    public void oncompletion(mediaplayer mp) {
      next();
    }
  }
  /*
   * 下一首按钮
   */
  public void next(view view) {
    next();
  }
  /*
   * 前一首按钮
   */
  public void previous(view view) {
    previous();
  }
  /*
   * 播放前一首歌
   */
  private void previous() {
    current = current - 1 < 0 ? data.size() - 1 : current - 1;
    play();
  }
  /*
   * 播放下一首歌
   */
  private void next() {
    current = (current + 1) % data.size();
    play();
  }
  /*
   * 进度条监听器
   */
  private final class myseekbarlistener implements onseekbarchangelistener {
    //移动触发
    public void onprogresschanged(seekbar seekbar, int progress, boolean fromuser) {
    }
    //起始触发
    public void onstarttrackingtouch(seekbar seekbar) {
      isstarttrackingtouch = true;
    }
    //结束触发
    public void onstoptrackingtouch(seekbar seekbar) {
      player.seekto(seekbar.getprogress());
      isstarttrackingtouch = false;
    }
  }
  /*
   * 显示音乐播放列表
   */
  private void generatelistview() {
    list<file> list = new arraylist<file>();
    //获取sdcard中的所有歌曲
    findall(environment.getexternalstoragedirectory(), list);
    //播放列表进行排序，字符顺序
    collections.sort(list);
    data = new arraylist<map<string, string>>();
    for (file file : list) {
      map<string, string> map = new hashmap<string, string>();
      map.put("name", file.getname());
      map.put("path", file.getabsolutepath());
      data.add(map);
    }
    simpleadapter adapter = new simpleadapter(this, data, r.layout.item, new string[] { "name" }, new int[] { r.id.mname });
    listview.setadapter(adapter);
    listview.setonitemclicklistener(new myitemlistener());
  }
  private final class myitemlistener implements onitemclicklistener {
    public void onitemclick(adapterview<?> parent, view view, int position, long id) {
      current = position;
      play();
    }
  }
  private void play() {
    try {
      //重播
      player.reset();
      //获取歌曲路径
      player.setdatasource(data.get(current).get("path"));
      //缓冲
      player.prepare();
      //开始播放
      player.start();
      //显示歌名
      nametextview.settext(data.get(current).get("name"));
      //设置进度条长度
      seekbar.setmax(player.getduration());
      //播放按钮样式
      ppbutton.settext("||");
      //发送一个runnable, handler收到之后就会执行run()方法
      handler.post(new runnable() {
        public void run() {
          // 更新进度条状态
          if (!isstarttrackingtouch)
            seekbar.setprogress(player.getcurrentposition());
          // 1秒之后再次发送
          handler.postdelayed(this, 1000);
        }
      });
    } catch (exception e) {
      e.printstacktrace();
    }
  }
  /**
   * 查找文件路径中所有mp3文件
   * @param file 要找的目录
   * @param list 用来装文件的list
   */
  private void findall(file file, list<file> list) {
    file[] subfiles = file.listfiles();
    if (subfiles != null)
      for (file subfile : subfiles) {
        if (subfile.isfile() && subfile.getname().endswith(".mp3"))
          list.add(subfile);
        else if (subfile.isdirectory())//如果是目录
          findall(subfile, list); //递归
      }
  }
  /*
   * 暂停/播放按钮
   */
  public void pp(view view) {
    //默认从第一首歌曲开始播放
    if (!player.isplaying() && !ispause) {
      play();
      return;
    }
    button button = (button) view;
    //暂停/播放按钮
    if ("||".equals(button.gettext())) {
      pause();
      button.settext("▶");
    } else {
      resume();
      button.settext("||");
    }
  }
  /*
   * 开始操作
   */
  private void resume() {
    if (ispause) {
      player.start();
      ispause = false;
    }
  }
  /*
   * 暂停操作
   */
  private void pause() {
    if (player != null && player.isplaying()) {
      player.pause();
      ispause = true;
    }
  }
  /*
   * 收到广播时暂停
   */
  private final class phonelistener extends broadcastreceiver {
    public void onreceive(context context, intent intent) {
      pause();
    }
  }
  /*
   * 恢复播放
   * @see android.app.activity#onresume()
   */
  protected void onresume() {
    super.onresume();
    resume();
  }
}

注册权限：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="cn.itcast.audio"
   android:versioncode="1"
   android:versionname="1.0">
  <application android:icon="@drawable/icon" android:label="@string/app_name">
    <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>
  </application>
  <uses-sdk android:minsdkversion="8" />
  <!-- 监听电话呼出 -->
  <uses-permission android:name="android.permission.process_outgoing_calls"/>
  <!-- 监听电话状态改变 -->
  <uses-permission android:name="android.permission.read_phone_state" />
</manifest>

希望本文所述对大家android程序设计有所帮助。