
You will have to create icons for each different dimension, based on the Android device screen resolutions and density. Now, creating these icons may seem easy if you are a designer, or if you are a developer who has a designer on your team. Here is an example of the WhatsApp icons: You can learn more about these icon categories by looking at other apps.

There are a set of defined rules for the design, colour, icon and other UI elements that your Android app should follow. When users like what they see in an app UI, they're much more likely to install it. You can add value to any product by giving the user interface a professional look and feel.
