Guides
Longer explanations of the concepts behind the calculators — density, dp, buckets and the adb commands that change them.
Android DPI explained: dpi vs ppi vs dp
Why your phone reports a dpi that does not match its physical ppi, and what each number is actually used for.
How to change Android DPI with adb
Change and reset screen density using wm density, including the exact commands, safe ranges and how to recover.
Android density buckets and drawable folders
What mdpi through xxxhdpi actually mean, which bucket your device picks, and where to put your drawables.