In Android you have 2 type of qualifiers for image sizes:
- Screen pixel density (dpi): Is the screen resolution. i.e. hdpi, xhdpi, tvdpi.
- Screen size: Is the phisical size of the screen. i.e. small, normal, large, xlarge.
Some tablets have big screens, but with low dpi, there so they use images from mdpi or hdpi folder. But you can create special folders for tablets using the screen size qualifier to assign images. For example you can have:
res/
drawable-mdpi/
drawable-hdpi/
drawable-xhdpi/
drawable-xxhdpi/
drawable-xlarge-mdpi/
drawable-xlarge-hdpi/
drawable-xlarge-xhdpi/
drawable-xlarge-xxhdpi/
Your tablet will use the resources from drawable-xlarge-
according to the dpi resolution.
To learn more about this refer to:
https://developer.android.com/guide/topics/resources/providing-resources.html