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Have read the doc which is lengthy and still not clear.
Assuming I have an image with size = 120px * 80px, under the default mdpi/160 density, I also need to prepare
ldpi = 90 * 60
hdpi = 180 * 120
xhdpi = 240 * 160
Are the calculation above right? Assume I only have a single layout, so what I need is to prepare the images and place them under the corresponding drawable folders, right?
Thanks
Yes, those are the correct sizes.
Yes, just put your various versions in the res/drawable-ldpi, -mdpi, -hdpi, and -xhdpi
folders and you’re done.
Depending on your image — specifically whether it still looks good scaled down automatically — you could just provide hdpi and xhdpi versions and Android will automatically scale them at run-time for ldpi and mdpi respectively.