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年月日2013129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软件工程 (计算机软件与服务外包 )学院 (系) 计算机学院 专 业王彦2013-12-09成 绩批阅人日期 实验报告android 广播、线程、服务与多媒体开发实验名称实验类型一、指导教师实验时间4实验实验学时2013-12-9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pc(window7) 、 eclipse1 三、实验原理及内容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 lrcpr

3、ocess mlrcprocess ;public lrcview mlrcview ;public static int playing_id = 0;public static boolean playing = false ;overridepublic ibinder onbind(intent arg0) / todoauto-generated methodstub return null ;overridepublic void oncreate() / todoauto-generated method stublists = musiclist. getmusicdata (

4、getapplicationcontext();seekbarbroadcastreceiver receiver =new seekbarbroadcastreceiver();intentfilter filter = new intentfilter( .karl.seekbar );this .registerreceiver(receiver, filter);new thread( this ).start();super .oncreate();overridepublic void onstart(intent intent, int startid) 2 / to

5、doauto-generated method stubstring play = intent.getstringextra(_id = intent.getintextra( id , 1);if (play.equals( play ) 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

6、) if ( player != null ) player .start(); else playmusic( _id); else if (play.equals( replaying ) else if (play.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

7、 = intent.getintextra( id , 0);playmusic(id); else if (play.equals( last ) int id = intent.getintextra( id , 0);playmusic(id);private void playmusic( int id) / / 初始化歌词配置 / /mlrcprocess = new lrcprocess();/ 读取歌词文件3 mlrcprocess .readlrc( lists .get( _id ).geturl();/ 传回处理后的歌词文件lrclist = mlrcprocess .ge

8、tlrccontent();musicactivity. lrc_view .setsentenceentities( lrclist );/ 切换带动画显示歌词/ 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

9、= m.geturl();uri myuri = uri. parse (url);player = new mediaplayer();player .reset();player .setaudiostreamtype(audiomanager.try stream_music);player .setdatasource(getapplicationcontext(), myuri);player .prepare(); catch (illegalargumentexception e) / todoauto-generated catchblock e.printstacktrace

10、(); catch (securityexception e) / todoauto-generated catchblock e.printstacktrace(); catch (illegalstateexception e) / todoauto-generated catchblock e.printstacktrace(); catch (ioexception e) / todoauto-generated catchblock e.printstacktrace();player .start();4 player .setoncompletionlistener( new o

11、ncompletionlistener() overridepublic voidoncompletion(mediaplayer mp) / todoauto-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 i

12、ntent = new intent( pletion );sendbroadcast(intent);playmusic( _id ););player .setonerrorlistener( new onerrorlistener() overridepublic boolean onerror(mediaplayer mp, int what, int extra) / todoauto-generated method stubif ( null != player ) player .release();player = null ;music m =

13、 lists .get( _id );string url = m.geturl();uri myuri = uri. parse (url);player = new mediaplayer();player .reset();player .setaudiostreamtype(audiomanager. stream_music);try player .setdatasource(getapplicationcontext(), myuri);player .prepare();e.printstacktrace(); catch (securityexception e) / tod

14、oauto-generated catchblock e.printstacktrace();5 catch (illegalstateexception e) / todoauto-generated catchblock e.printstacktrace(); catch (ioexception e) / todoauto-generated catchblock e.printstacktrace();player .start();return false;);private class seekbarbroadcastreceiveroverrideextends broadca

15、streceiver public void onreceive(context context, intent intent) / todoauto-generated method stubint seekbarposition = intent.getintextra(seekbarposition, 0);/ system.out.println(-+seekbarposition);player .seekto(seekbarposition *player .start();player .getduration() / 100);overridepublic void run()

16、 / todoauto-generated methodstub while ( isrun ) try thread. sleep (200); catch (interruptedexception e) / todoauto-generated catchblock e.printstacktrace();if ( null != player ) int position =player .getcurrentposition();int total = player .getduration();intent intent =new intent( gr

17、ess );intent.putextra( position , position);intent.putextra( total , total);6 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() / todoauto-ge

18、nerated method stubmusicactivity.lrc_view .setindex(lrcindex();musicactivity. lrc_view .invalidate();mhandler .postdelayed( mrunnable , 100);/ 创建对象private listlrclist = 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cu