You can increase the size of Icon to a required value by assigning the size property with specific double value .
Read moreWhat size should an app icon be?
Android recommends your starting app size to be 864×864 pixels because it will make it easier to tweak the design if need be. However, the majority of devices will use 36×36, 48×48, 72×72, or 96×96 pixels. (Note that Android app icons must be saved as PNG files, not JPEG).
Read more