I want to integrate Google signIn in android application but don't want use Google Sign Button for authentication.
I want to authenticate user by his inputs like Email & Password. (User will enter email & password in editText) If it is possible, then how?
Please refer image

To authenticate with email and password i kindly recomand you using Firebase authentication. In my opinion is what you need. If you want to sign-in with Google, please take a look at this Firebase authentication using Google.
Hope it helps.