In android studio there is a default icon set by android studio itself that are located in MIPMAP OR DRAWBLE Directory. You can change it as per the application requirement.
How to change the Application Icon In Android Studio:
Follow the steps below.
Open your application in Android Studio if you have existing project you can import or create New project FILE>>NEW>>NEW PROJECT.
Further follow the path to reach the desired folder to add icon (app -> res-> drawable). and paste image or icon to this directory
After placing the image or in the drawable folder. You need to rename the default icon name to your icon image name in Androidmanifest.xml.
Now locate androidmanifest file and rename this (app >> manifests) open AndroidManifest.xml file. Here find the following code.
android:icon=”@drawble/icon“ or default android:icon=”@mipmap/ic_launcher” at this point you need to define the correct image path.