Android - Adding Images To Project

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http://stackoverflow.com – I am brand new to Android and I am using Eclipse ADT to create a simple application. This application has a button that changes it's background image based on user clicks. I noticed that there are 4 folders for images in my project: drawable-hdpi, drawable-ldpi, drawable-mdpi, and drawable-xhdpi. and I also noticed that the images that are in there currently (the launcher icon) are all different sizes. Does this mean that I have to use some image editing software to create one image for each resolution for each of my images? Or (hopefully) is there a way to import an image and have this don (HowTos)