Here’s the structure of a typical Android project:     

Project Files  - The gradle.properties file describes your settings and configures a build environment, whereas the settings.gradle file lists your modules and project name. The Gradle wrapper is connected to the gradle, gradlew, and gradlew.bat files. The top-level build file build.gradle is where we can include configuration settings shared by all modules.  

Module Files - The configurations specific to this module are contained in the module build.gradle file.

A library is a collection of already written materials that may be included in your app, and the Android ecosystem for libraries is extensive. Many libraries can be used in a single project. It's simple to incorporate a library into your project. Define the group id, artifact id, and version in the dependencies section of your app/build.gradle file.

Activity is one of Android's essential elements. A user can move across the back stack, consisting of several activities that can be launched on top of one another, known as an application, utilizing the UI components. Each activity has its lifespan. The six main callbacks available in the Activity class are onCreate (), onStart (), onResume (), onPause (), onStop (), and onDestroy ( ).   There are two main processes to creating an activity. First, create a Java class and extend it from the Activity superclass. Backward compatibility could be attained using the library AppCompatActivity. Also, remember that the AndroidManfiest.xml file is where Android activities must be declared.

Your UI's layout establishes its overall structure, created using views and view groups. Components like TextView, EditText, and Button are examples of views. The Google library ContraintLayout, which employs constraints to place your widgets, may be used with ViewGroups.  

Using an XML file is the simplest way to create a layout. Then, we can attach this layout to an activity. Now that we've built a layout let's examine how it's done.   

1. Inside your app/src/main/res/layout folder, create an activity_main.xml layout file 

2. Fill empty layout by defining a child view   

The alignment comes next. Layout binding is done when we have everything aligned as desired. View binding comes next after layout binding. It provides runtime interaction with views.