MP3播放器项目---编写代码---6 -

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MP3播放器项目---编写代码---6

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androidMP3播放器项目

MP3播放器项目---编写代码---6

1. Mp3ListActivity

package hui.mp3player;

import hui.download.HttpDownloader;
import hui.model.Mp3Info;
import hui.xml.Mp3ListContentHandler;

import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

import javax.xml.parsers.SAXParserFactory;

import hui.mp3player.R;
import hui.download.*;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import hui.mp3player.*;
import android.R.xml;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class Mp3ListActivity extends ListActivity {
	private static final int UPDATE = 1;
	private static final int ABOUT = 2;
	private List<Mp3Info> mp3Infos = null;
	private static final String XML_URL=null;

	/**
	 * 在用点击MENU按钮之后，会调用该方法，我们可以在这个方法当中加入自己的按钮控件
	 */
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// TODO Auto-generated method stub
		menu.add(0, UPDATE, 1, R.string.mp3list_update);
		menu.add(0, ABOUT, 2, R.string.mp3list_about);
		return super.onCreateOptionsMenu(menu);
	}

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.remote_mp3_list);
		updateListView();
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if (item.getItemId() == UPDATE) {
			updateListView();
		} else if (item.getItemId() == ABOUT) {
			// 用户点击了关于按钮
		}
		return super.onOptionsItemSelected(item);
	}

	private SimpleAdapter buildSimpleAdapter(List<Mp3Info> mp3Infos) {
		// 生成一个List对象，并按照SimpleAdapter的标准，将mp3Infos当中的数据添加到List当中去
		List<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
		for (Iterator iterator = mp3Infos.iterator(); iterator.hasNext();) {
			Mp3Info mp3Info = (Mp3Info) iterator.next();
			HashMap<String, Object> map = new HashMap<String, Object>();
			map.put("mp3_name", mp3Info.getMp3Name());
			map.put("mp3_size", mp3Info.getMp3Size());
			map.put("mp3_icon",  R.drawable.kky);
			//map.put("mp3_icon",  R.drawable.i2);
			//map.put("mp3_icon",  R.drawable.i3);
			list.add(map);
		}
		// 创建一个SimpleAdapter对象
		SimpleAdapter simpleAdapter = new SimpleAdapter(this, list,
				R.layout.mp3info_item, new String[] { "mp3_name", "mp3_size","mp3_icon" },
				new int[] { R.id.mp3_name, R.id.mp3_size,R.id.mp3_icon });
		// 将这个SimpleAdapter对象设置到ListActivity当中
		return simpleAdapter;
	}

	private void updateListView() {
		// 用户点击了更新列表按钮
		// 下载包含所有Mp3基本信息的xml文件
		String xml = downloadXML("http://192.168.1.2:8080/myapp/11.xml");
		// 对xml文件进行解析，并将解析的结果放置到Mp3Info对象当中，最后将这些Mp3Info对象放置到List当中
		mp3Infos = parse(xml);
		SimpleAdapter simpleAdapter = buildSimpleAdapter(mp3Infos);
		setListAdapter(simpleAdapter);
	}

	private String downloadXML(String urlStr) {
		HttpDownloader httpDownloader = new HttpDownloader();
		String result = httpDownloader.download(urlStr);
		return result;
	}

	private List<Mp3Info> parse(String xmlStr) {
		SAXParserFactory saxParserFactory = SAXParserFactory.newInstance();
		List<Mp3Info> infos = new ArrayList<Mp3Info>();
		
		try {
			URL url=new URL("http://192.168.1.2:8080/myapp/11.xml");
			//System.out.print("url-------"+url);
			//Mp3Info mp3info = new Mp3Info();
			//Mp3Info mp3Info1 = mp3Info1.getMp3Name();
			//String uriStr=XML_URL+URLEncoder.encode(mp3Info1.getMp3Name(),"UTF-8"); 
			//URL url=new URL(uriStr); 
			
			XMLReader xmlReader = saxParserFactory.newSAXParser()
					.getXMLReader();
			Mp3ListContentHandler mp3ListContentHandler = new Mp3ListContentHandler(
					infos);
			xmlReader.setContentHandler(mp3ListContentHandler);
			
			InputStreamReader isr =new InputStreamReader(url.openStream(),"GB2312"); 
			//StringReader stringReader = new StringReader(resultStr);
			InputSource inputSource = new InputSource(isr);
			
			//StringReader stringReader = new StringReader(xmlStr);
			//InputSource inputSource = new InputSource(stringReader);
			
			xmlReader.parse(inputSource);
			for (Iterator iterator = infos.iterator(); iterator.hasNext();) {
				Mp3Info mp3Info = (Mp3Info) iterator.next();
				System.out.println("显示111-------"+mp3Info);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return infos;
	}

	@Override
	protected void onListItemClick(ListView l, View v, int position, long id) {
		// 根据用户点击列表当中的位置来得到响应的Mp3Info对象
		Mp3Info mp3Info = mp3Infos.get(position);
		// 生成Intent对象
		Intent intent = new Intent();
		System.out.print("点击-----"+ mp3Info);
		// 将Mp3Info对象存入到Intent对象当中
		intent.putExtra("mp3Info", mp3Info);
		
		intent.setClass(this, DownloadService.class);
		// 启动Service
		startService(intent);
		super.onListItemClick(l, v, position, id);
	}

}

2.PlayerActivity

package hui.mp3player;

import hui.lrc.LrcProcessor;
import hui.model.Mp3Info;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Queue;

import hui.mp3player.R;

import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;

public class PlayerActivity extends Activity {
	ImageButton beginButton = null;
	ImageButton pauseButton = null;
	ImageButton stopButton = null;
	MediaPlayer mediaPlayer = null;

	private ArrayList<Queue> queues = null;
	private TextView lrcTextView = null;
	private Mp3Info mp3Info = null;
	private Handler handler = new Handler();
	private UpdateTimeCallback updateTimeCallback = null;
	private long begin = 0;
	private long nextTimeMill = 0;
	private long currentTimeMill = 0;
	private String message = null;
	private long pauseTimeMills = 0;
	private boolean isPlaying = false;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.player);
		Intent intent = getIntent();
		mp3Info = (Mp3Info) intent.getSerializableExtra("mp3Info");
		beginButton = (ImageButton) findViewById(R.id.begin);
		pauseButton = (ImageButton) findViewById(R.id.pause);
		stopButton = (ImageButton) findViewById(R.id.stop);
		beginButton.setOnClickListener(new BeginButtonListener());
		pauseButton.setOnClickListener(new PauseButtonListener());
		stopButton.setOnClickListener(new StopButtonListener());
		lrcTextView = (TextView)findViewById(R.id.lrcText);
	}

	/**
	 * 根据歌词文件的名字，来读取歌词文件当中的信息
	 * @param lrcName
	 */
	private void prepareLrc(String lrcName){
		try {
			InputStream inputStream = new FileInputStream(Environment.getExternalStorageDirectory().getAbsoluteFile() +File.separator + "mp3/" + mp3Info.getLrcName());
			LrcProcessor lrcProcessor = new LrcProcessor();
			queues = lrcProcessor.process(inputStream);
			//创建一个UpdateTimeCallback对象
			updateTimeCallback = new UpdateTimeCallback(queues);
			begin = 0 ;
			currentTimeMill = 0 ;
			nextTimeMill = 0 ;
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}
	class BeginButtonListener implements OnClickListener {

		@Override
		public void onClick(View v) {
			//创建一个Intent对象，用于同时Service开始播放MP3
			Intent intent = new Intent();
			intent.setClass(PlayerActivity.this, PlayerService.class);
			intent.putExtra("mp3Info", mp3Info);
			intent.putExtra("MSG", AppConstant.PlayerMsg.PLAY_MSG);
			//读取LRC文件
			prepareLrc(mp3Info.getLrcName());
			//启动Service
			startService(intent);
			//将begin的值置为当前毫秒数
			begin = System.currentTimeMillis();
			//执行updateTimeCallback
			handler.postDelayed(updateTimeCallback, 5);
			isPlaying = true;
		}

	}

	class PauseButtonListener implements OnClickListener {

		@Override
		public void onClick(View v) {
			//通知Service暂停播放MP3
			Intent intent = new Intent();
			intent.setClass(PlayerActivity.this, PlayerService.class);
			intent.putExtra("MSG", AppConstant.PlayerMsg.PAUSE_MSG);
			startService(intent);
			//
			if(isPlaying){
				handler.removeCallbacks(updateTimeCallback);
				pauseTimeMills = System.currentTimeMillis();
			}
			else{
				handler.postDelayed(updateTimeCallback, 5);
				begin = System.currentTimeMillis() - pauseTimeMills + begin;
			}
			isPlaying = isPlaying ? false : true;
		}

	}

	class StopButtonListener implements OnClickListener {

		@Override
		public void onClick(View v) {
			//通知Service停止播放MP3文件
			Intent intent = new Intent();
			intent.setClass(PlayerActivity.this, PlayerService.class);
			intent.putExtra("MSG", AppConstant.PlayerMsg.STOP_MSG);
			startService(intent);
			//从Handler当中移除updateTimeCallback
			handler.removeCallbacks(updateTimeCallback);
		}

	}
	
	class UpdateTimeCallback implements Runnable{
		Queue times = null;
		Queue messages = null;
		public UpdateTimeCallback(ArrayList<Queue> queues) {
			//从ArrayList当中取出相应的对象对象
			times = queues.get(0);
			messages = queues.get(1);
		}
		@Override
		public void run() {
			//计算偏移量，也就是说从开始播放MP3到现在为止，共消耗了多少时间，以毫秒为单位
			long offset = System.currentTimeMillis() - begin;
			if(currentTimeMill == 0){
				nextTimeMill = (Long)times.poll();
				message = (String)messages.poll();
			}
			if(offset >= nextTimeMill){
				lrcTextView.setText(message);
				message = (String)messages.poll();
				nextTimeMill = (Long)times.poll();
			}
			currentTimeMill = currentTimeMill + 10;
			handler.postDelayed(updateTimeCallback, 10);
		}
		
	}
}

3.PlayerService

package hui.mp3player;

import hui.lrc.LrcProcessor;
import hui.model.Mp3Info;
import hui.mp3player.AppConstant;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Queue;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Environment;
import android.os.IBinder;

public class PlayerService extends Service {

	private boolean isPlaying = false;
	private boolean isPause = false;
	private boolean isReleased = false;
	private MediaPlayer mediaPlayer = null;

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		Mp3Info mp3Info = (Mp3Info) intent.getSerializableExtra("mp3Info");
		int MSG = intent.getIntExtra("MSG", 0);
		if (mp3Info != null) {
			if(MSG == AppConstant.PlayerMsg.PLAY_MSG){
				play(mp3Info);
			}
		} else {
			if(MSG == AppConstant.PlayerMsg.PAUSE_MSG){
				pause();
			}
			else if(MSG == AppConstant.PlayerMsg.STOP_MSG){
				stop();
			}
		}
		return super.onStartCommand(intent, flags, startId);
	}

	private void play(Mp3Info mp3Info) {

			String path = getMp3Path(mp3Info);
			mediaPlayer = MediaPlayer.create(this, Uri.parse("file://" + path));
			mediaPlayer.setLooping(false);
			mediaPlayer.start();
			isPlaying = true;
			isReleased = false;
		
	}

	private void pause() {
		if (mediaPlayer != null) {
			if (!isReleased) {
				if (!isPause) {
					mediaPlayer.pause();
					isPause = true;
					isPlaying = true;
				} else {
					mediaPlayer.start();
					isPause = false;
				}
			}
		}
	}

	private void stop() {
		if (mediaPlayer != null) {
			if (isPlaying) {
				if (!isReleased) {
					mediaPlayer.stop();
					mediaPlayer.release();
					isReleased = true;
				}
				isPlaying = false;
			}
		}
	}

	private String getMp3Path(Mp3Info mp3Info) {
		String SDCardRoot = Environment.getExternalStorageDirectory()
				.getAbsolutePath();
		String path = SDCardRoot + File.separator + "mp3" + File.separator
				+ mp3Info.getMp3Name();
		return path;
	}
}

上个图------很丑---UI搞得很辛苦所以放弃了，弄下天气的程序