How to Change your application icon.
Low density -- ldpi -- 36×36 px
Medium density -- mdpi -- 48×48 px (correct size if only one drawable folder)
High density -- hdpi -- 72×72 px
Low density -- ldpi -- 36×36 px
Medium density -- mdpi -- 48×48 px (correct size if only one drawable folder)
High density -- hdpi -- 72×72 px