根据音乐文件和LRC文件的绝对路径下载到sdcard指定目录中

/**
	 * 下载音乐文件到指定目录
	 * @param musicPath
	 * @param musicName
	 * @param singerName
	 */
	public void downloadMusic(final String musicPath, String musicName,
			String singerName ) {
		
		String dir = "ccpod/downloadMusic";
		final String filePath = "/sdcard/ccpod/downloadMusic/" + 
			musicName +"-"+ singerName +".mp3";
		FileService fileService = new FileService();
		fileService.createFileDir(dir);	
		fileService.createFile(filePath);
		
		Runnable r = new Runnable(){
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				int count;
				try {
				URL url = new URL(musicPath);
				InputStream input = new BufferedInputStream(url.openStream());
				OutputStream output = new FileOutputStream(filePath);
				byte data[] = new byte[1024];
				while ((count = input.read(data)) != -1) {
					output.write(data, 0, count);
					System.out.println(count);
				}
				output.flush();
				output.close();
				input.close();
				} catch (Exception e) {
				Log.e("error",e.getMessage().toString());
				System.out.println(e.getMessage().toString());
				}
			}
		};
		new Thread(r).start();
	}




/**
	 * 下载歌词文件到指定目录
	 * @param lrcPath
	 * @param musicName
	 * @param singerName
	 */
	public void downloadLyric(final String lrcPath, String musicName,
			String singerName) {

		
		String dir = "ccpod/lyric";
		final String filePath = "/sdcard/ccpod/lyric/" + musicName + "-"
				+ singerName + ".lrc";
		FileService fileService = new FileService();
		fileService.createFileDir(dir);
		fileService.createFile(filePath);

		Runnable r = new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				StringBuffer sb = new StringBuffer();
				try {
					URL url = new URL(lrcPath);
					InputStream input = new BufferedInputStream(
							url.openStream());
					BufferedReader br = new BufferedReader(  
                            new InputStreamReader(input,"GB2312")); 
					
					Writer writer = new OutputStreamWriter(new FileOutputStream(filePath));
					String data = "";  					  
                    while ((data = br.readLine()) != null) {  
                        sb.append(data+ "\r\n");  
                    }
                    writer.write(sb.toString());
					writer.close();
					input.close();
				} catch (Exception e) {
					Log.e("error", e.getMessage().toString());
				}
			}
		};
		new Thread(r).start();
	}

下载歌词时要注意inputStream的转码，由于服务器中的xml文件是用gb2312编码，所以应按照原来的格式读进来


其中创建文件和文件目录代码如下：

FileService.java
public boolean createFileDir(String dirName) {
		dirName = Environment.getExternalStorageDirectory() + "/" + dirName;
		File dir = new File(dirName);
		if (dir.exists()) {
			return false;
		}
		if (!dirName.endsWith("/")) {
			dirName += File.separator;
		}
		if (dir.mkdirs()) {
			return true;
		} else
			return false;
	}
	
	public boolean createFile(String fileName){
		File file = new File(fileName);
		if(file.exists()){
			System.out.println("创建单个文件："+ fileName + "失败，目标文件已存在");
			return false;
		}
		if(!file.getParentFile().exists()){
			System.out.println("目标文件所在目录不存在，准备创建它");
			return false;
		}
		try {
			if(file.createNewFile()){
				return true;
			}else{
				return false;
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		}
	}

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参考资料：
Android中文乱码彻底解决
http://www.iteye.com/topic/509046


Android 中下载文件到sdcard和进度条小结
http://www.linuxidc.com/Linux/2011-08/40941.htm


Android中的自动下载歌词
http://www.eoeandroid.com/forum.php?mod=viewthread&tid=61595