When one first creates a new project, that dialog lets you point to some external .PNG file, and then when that dialog completes, it generates 4 different pixel-sizes of ima
File >In androidStudio Open your application(your project)
Go to res folder and then right click on that folder select the new tab in that go to image asset tab you will get asset studio display page .
Browse(select) the icon that you want get as app icon(no need to change the drawble folder) .
And then click next tab and finish.