how to access directory list in android

i want to access the directory stru开发者_如何学Pythoncture in my application

try

File f = new File(Environment.getExternalStorageDirectory());
File[] files = f.listFiles();

File mfile=new File("/sdcard/");
File[] list=mfile.listFiles();

System.out.println("list"+mfile.listFiles().length);
for(int i=0;i<mfile.listFiles().length;i++)
{
   System.out.println("hidden path files.."+list[i].getAbsolutePath()); 
}

try this