3. Hosting assetlinks.json file

Host an assetlinks.json file in using a web server with a domain that you own.
This file tells the mobile browser which Android application to open instead of the browser.
To create the file, get the package name of the Flutter app you created in the previous step and
the sha256 fingerprint of the signing key you will be using to build the APK.

Package name

Locate the package name in AndroidManifest.xml, the package property under <manifest> tag.
Package names are usually in the format of com.example.*.

sha256 fingerprint

Process may differ depending on the way apk is signed.

Using google play app signing

You can find the sha256 fingerprint directly from play developer console. Open your app in the play
console, under Release> Setup > App Integrity> App Signing tab

Using local keystore