Once the project is created, create a new package named ui in the com.example.messenger application source package. This package will hold all the user-interface-related classes and logic of the Android application. Create a login package within ui. As you may have guessed, this package will hold classes and logic pertaining to the user-login process. Go ahead and move LoginActivity to the login package. Having moved LoginActivity, our first order of business is to create a suitable layout for the login activity.
Locate the activity_login.xml layout resource file and change the following content:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools ...
