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