Support icons and images into different device screen size and resolution

First create xxxhdpi image size according below mention , then generate 9 patch images from  

https://romannurik.github.io/AndroidAssetStudio/nine-patches.html

After that use generated image in your android project- That's easy your effort and save time

1. Action bar , tab and dialog icons --> 96x96 (xxxhdpi) 

2. Normal images size -->  192x192 (xxxhdpi)

3. App logo --> 192 × 192 (xxxhdpi)

                           -->  512 × 512 (Google Play store)