安卓Android广播、线程、服务与多媒体开发实验报告.doc

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、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)、Eclipse3、 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Intent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;public 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 SeekBarBroadcastReceiver();IntentFilter filter = new IntentFilter(.karl.seekBar);this.registerReceiver(receiver, filter);new Thread(this).start();super.onCreate();Overridepublic void onStart(Intent intent, int startId) / TODO Auto-generated method stubString play = intent.getStringExtra(play);_id = intent.getIntExtra(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 (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 = 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.loadAnimation(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);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 Auto-generated catch blocke.printStackTrace(); catch (IllegalStateException e) / TODO Auto-generated catch blocke.printStackTrace(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();player.start();player.setOnCompletionListener(new OnCompletionListener() Overridepublic void onCompletion(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);sendBroadcast(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(url);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 Auto-generated catch blocke.printStackTrace(); 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 BroadcastReceiver 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() / 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);intent.putExtra(position, position);intent.putExtra(total, total);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 method 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