AppleScript for organizing Android assets. To turn into a Service: In Automator, create a new Service for files in Finder and add this script. From the Finder select a group of files that have densitiy suffixes like "icon-hdpi.png" and "icon-mdpi.png" and run the script. The files will be organized into the appropiate drawable folders and renamed.

Process Android Assets

property sizeList : {"mdpi", "hdpi", "xhdpi", "xxhdpi", "xxxhdpi"}
property extensionList : {"jpg", "jpeg", "png"}

on run {input, parameters}
	
	repeat with i from 1 to the count of input
		
		set thisItem to item i of input
		set itemInfo to info for thisItem
		set fileName to name of itemInfo
		set fileExt to the name extension of itemInfo
		tell application "Finder"
			set parentFolder to container of thisItem as Unicode text
		end tell
		
		if fileExt is in extensionList then
			repeat with idx from 1 to the count of sizeList
				set thisSize to item idx of sizeList
				if fileName contains thisSize then
					set targetFolder to createFolderIfNeeded(thisItem, thisSize, parentFolder)
					set findString to "-" & thisSize
					set newName to replaceText(findString, "", fileName)
					tell application "Finder"
						-- Replace file if it exists
						set newFilePath to targetFolder & ":" &newName
						if exists (newFilePath) then
							delete file newFilePath
						end if
						-- Move file and rename
						set fileMoved to move thisItem to targetFolder
						set theFileToRename to fileMoved as alias
						set name of theFileToRename to newName
					end tell
				end if
			end repeat
		end if
		
	end repeat
	
	return input
	
end run

on createFolderIfNeeded(thisItem, thisSize, parentFolder)
	tell application "Finder"
		set folderName to "drawable-" & thisSize
		set folderPath to parentFolder & folderName
		if not (exists (folderPath)) then
			make new folder at parentFolder with properties {name:folderName}
		end if
	end tell
	return folderPath
end createFolderIfNeeded

on replaceText(find, replace, subject)
	set prevTIDs to text item delimiters of AppleScript
	set text item delimiters of AppleScript to find
	set subject to text items of subject
	
	set text item delimiters of AppleScript to replace
	set subject to "" & subject
	set text item delimiters of AppleScript to prevTIDs
	
	return subject
end replaceText