[Android] Make FolderBrowser.Fill look slightly nicer. Improve readability a bit. - Added a basic function description. - Modified the main parameter to be more informative of what should be passed. Helps people who read the codebase for the first time. - Made a variable for storing the entry name so getName() isn't called a bunch of times. - Added some comments to explain some parts. - Rename the exception catch variable to ignored, since it currently isn't being used.