1.写一个类实现FileFilter接口

public class MP3FileFilter implements FileFilter {  
  
    @Override  
    public boolean accept(File file) {  
	
        if(file.isDirectory())  
            return true;  
        else  
        {  
            String name = file.getName();  
            if(name.endsWith(".mp3") || name.endsWith(".mp4"))  
                return true;  
            else  
                return false;  
        }  
          
    }  
}

2.传一个路径，获取改路径下的所有mp3 and mp4文件

/** 
 * get all the music file in the rootpath. 
 * @param rootPath 
 */  
public void getAllFilePath(String rootPath)  
{
	File file = new File(rootPath);  
	File[] files = file.listFiles(new MP3FileFilter());  
	for(int i=0;i<files.length;i++)  
	{
		if(files[i].isDirectory())  
		{
			getAllFilePath(files[i].getPath());  
		}
		else  
		{
			mArrayListMusicPaths.add(files[i].getPath());  
			mArrayListMusicNames.add(files[i].getName());  
			System.out.println(files[i].getPath());  
		}
	}
}

原文链接:http://blog.csdn.net/xiangyong2008/article/details/5899740