Review the Material Design product
icons guidelines for icon design.

In the [project]/android/app/src/main/res/ directory,
place your icon files in folders named using
configuration qualifiers.
The default mipmap- folders demonstrate the correct
naming convention.

In AndroidManifest.xml, update the
application tag’s android:icon
attribute to reference icons from the previous
step (for example,
<application android:icon="@mipmap/ic_launcher" ...).

To verify that the icon has been replaced,
run your app and inspect the app icon in the Launcher.

Enabling Material Components

If your app uses Platform Views, you may want to enable
Material Components by following the steps described in the
Getting Started guide for Android.

For example:

Add the dependency on Android’s Material in <my-app>/android/app/build.gradle:

dependencies

// ...