安卓Android广播、线程、服务与多媒体开发实验报告

1、.实 验 报 告（2013/2014学年 第一学期）课程名称软件技术系列课程（android基础）实验名称android广播、线程、服务与多媒体开发实验时间2013年12月9日指导单位计算机学院、诚迈科技（南京）公司指导教师学生姓名班级学号学院(系)计算机学院专 业软件工程(计算机软件与服务外包)成 绩批阅人王彦日期2013-12-09精品.精品.实 验 报 告实验名称android广播、线程、服务与多媒体开发指导教师实验类型实验实验学时4实验时间2013-12-9一、 实验目的和要求验证broadcast的发送与接收验证多线程间的数据传递验证service的使用方法验证多媒体开发中音频、视频

2、、或图像的采集与播放编写一个android小程序要求：1、使用广播传递数据或信息2、使用多线程3、适当应用service4、实现至少一种多媒体功能 二、 实验环境(实验设备) pc(window7)、eclipse精品.3、 实验原理及内容在这个程序中涉及到了receiver和broadcastreceiver的结合使用，首先在androidmanifest.xml中注册receiver，实现能够在后台播放音乐的功能。 通过commandreceiver类实现接受前台activity发送的播放命令的intent。在commandreceiver类中，有后台service注册的接受前台控制命令i

3、ntent的receiver，广播播放状态变化的intent代码public class musicservice extends service implements runnable private mediaplayer player;private list lists;public static int _id = 1; / 当前播放位置public static boolean isrun = true;public lrcprocess mlrcprocess;public lrcview mlrcview;public static int playing_id = 0;pub

4、lic static boolean playing = false;overridepublic ibinder onbind(intent arg0) / todo auto-generated method stubreturn null;overridepublic void oncreate() / todo auto-generated method stublists = musiclist.getmusicdata(getapplicationcontext();seekbarbroadcastreceiver receiver = new seekbarbroadcastre

5、ceiver();intentfilter filter = new intentfilter(.karl.seekbar);this.registerreceiver(receiver, filter);new thread(this).start();super.oncreate();overridepublic void onstart(intent intent, int startid) 精品./ todo auto-generated method stubstring play = intent.getstringextra(play);_id = intent.ge

6、tintextra(id, 1);if (play.equals(play) if (null != player) player.release();player = null;playmusic(_id); else if (play.equals(pause) if (null != player) player.pause(); else if (play.equals(playing) if (player != null) player.start(); else playmusic(_id); else if (play.equals(replaying) else if (pl

7、ay.equals(first) int id = intent.getintextra(id, 0);playmusic(id); else if (play.equals(rewind) int id = intent.getintextra(id, 0);playmusic(id); else if (play.equals(forward) int id = intent.getintextra(id, 0);playmusic(id); else if (play.equals(last) int id = intent.getintextra(id, 0);playmusic(id

8、);private void playmusic(int id) / / 初始化歌词配置 / /mlrcprocess = new lrcprocess();/ 读取歌词文件精品.mlrcprocess.readlrc(lists.get(_id).geturl();/ 传回处理后的歌词文件lrclist = mlrcprocess.getlrccontent();musicactivity.lrc_view.setsentenceentities(lrclist);/ 切换带动画显示歌词musicactivity.lrc_view.setanimation(animationutils.lo

9、adanimation(musicservice.this, r.anim.alpha_z);/ 启动线程mhandler.post(mrunnable);/ / 初始化歌词配置 / /if (null != player) player.release();player = null;if (id = lists.size() - 1) _id = lists.size() - 1; else if (id = 0) _id = 0;music m = lists.get(_id);string url = m.geturl();uri myuri = uri.parse(url);play

10、er = new mediaplayer();player.reset();player.setaudiostreamtype(audiomanager.stream_music);try player.setdatasource(getapplicationcontext(), myuri);player.prepare(); catch (illegalargumentexception e) / todo auto-generated catch blocke.printstacktrace(); catch (securityexception e) / todo auto-gener

11、ated catch blocke.printstacktrace(); catch (illegalstateexception e) / todo auto-generated catch blocke.printstacktrace(); catch (ioexception e) / todo auto-generated catch blocke.printstacktrace();player.start();精品.player.setoncompletionlistener(new oncompletionlistener() overridepublic void oncomp

12、letion(mediaplayer mp) / todo auto-generated method stub/ 下一首if (musicactivity.isloop = true) player.reset();intent intent = new intent(pletion);sendbroadcast(intent);_id = _id + 1;playmusic(_id); else / 单曲播放player.reset();intent intent = new intent(pletion);sendbroadca

13、st(intent);playmusic(_id););player.setonerrorlistener(new onerrorlistener() overridepublic boolean onerror(mediaplayer mp, int what, int extra) / todo auto-generated method stubif (null != player) player.release();player = null;music m = lists.get(_id);string url = m.geturl();uri myuri = uri.parse(u

14、rl);player = new mediaplayer();player.reset();player.setaudiostreamtype(audiomanager.stream_music);try player.setdatasource(getapplicationcontext(), myuri);player.prepare(); catch (illegalargumentexception e) / todo auto-generated catch blocke.printstacktrace(); catch (securityexception e) / todo au

15、to-generated catch blocke.printstacktrace();精品. catch (illegalstateexception e) / todo auto-generated catch blocke.printstacktrace(); catch (ioexception e) / todo auto-generated catch blocke.printstacktrace();player.start();return false;);private class seekbarbroadcastreceiver extends broadcastrecei

16、ver overridepublic void onreceive(context context, intent intent) / todo auto-generated method stubint seekbarposition = intent.getintextra(seekbarposition, 0);/ system.out.println(-+seekbarposition);player.seekto(seekbarposition * player.getduration() / 100);player.start();overridepublic void run()

17、 / todo auto-generated method stubwhile (isrun) try thread.sleep(200); catch (interruptedexception e) / todo auto-generated catch blocke.printstacktrace();if (null != player) int position = player.getcurrentposition();int total = player.getduration();intent intent = new intent(gress);

18、intent.putextra(position, position);intent.putextra(total, total);精品.sendbroadcast(intent);if (null != player) if (player.isplaying() playing = true; else playing = false;handler mhandler = new handler();/ 歌词滚动线程runnable mrunnable = new runnable() overridepublic void run() / todo auto-generated meth

19、od stubmusicactivity.lrc_view.setindex(lrcindex();musicactivity.lrc_view.invalidate();mhandler.postdelayed(mrunnable, 100);/ 创建对象private list lrclist = new arraylist();/ 初始化歌词检索值private int index = 0;/ 初始化歌曲播放时间的变量private int currenttime = 0;/ 初始化歌曲总时间的变量private int counttime = 0;/* * 歌词同步处理类 */public int lrcindex() if (player.isplaying() / 获得歌曲播放在哪的时间currenttime = player.g