As you probably know, there are some icons on Github from Google to use. I wanted to implement a actionbar icon and saw this here(google.com/design) and this(dev.android.com) .
I myself implemented the 24dp one since it had a 24dp icon in the provided icons of Google. I put the icon in every folder by hand including xxxhdpi, xxhdpi, xhdpi, hdpi, mdpi but as you can see below the list-icon should be bigger as it is right now. (the list-icon ist the one below the battery icon)
So I checked out IO Schedule and there they have a 96px x 96px icon in a xxhdpi folder which totally confused me.
Use 24dp icons. This will give you following real image sizes:
In correct folders these will produce a 24dp image on appropriate screens.
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