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I know using images with different DPI is a fairly common practice in Android. But I don’t really see the purpose of it, why can’t we just use a ultra huge image and then scale it in the program? I know we probably need to do extra calculation if we don’t images in different DPI, but besides that, is there’s any other reason?
Tim and a.d. have the correct reasoning for you. Here’s a visual example if you’d like to see a comparison between something rescaled or drawn at the correct size. Effects are always more noticeable if there are very small details.
The first is a large 200×200 (we’ll call it xhdpi), and the second is simply the same image resampled for mdpi (75×75). The third is redesigned to the same specs but starting at 75×75. As you can see, the text on the second is significantly blurred, and there are some artifacts along the edges of the shapes where rescaled.