Gain insights into developing Android apps using Java, Groovy, and XML. Discover hands-on, project-based learning while building a fully functional Travel Blog Application for your portfolio.

So, you want to learn to build your own Android apps? You’ve come to the right place.

In this course, you’ll take a hands-on, project-based approach to developing Android applications. You’ll work with the most common tools that Android developers use every day including Java, Groovy, and XML. As you learn, you’ll build a fully functional Travel Blog Application that will be a great addition to your portfolio.

By the end of this course, you’ll have built a fully functional Android application and be ready to build even more complex projects.

Modern Android App Development with Java

Activity is one of the core components of the Android; it represents one screen of the application user interface. 

Usually, an Android application consists of several activities, e.g. “Travel Blog” application may contain the following activities:

- *LoginActivity* - represents login flow
- *ListActivity* - represents a list of recent article titles
- *DetailActivity* - represents an article itself

Activities can be launched on top of each other, forming an activity back stack. Users can navigate through this back stack via UI (User Interface) components or navigate back via the system back button.

The activity has its own lifecycle, which helps the developer to understand when an activity is created or destroyed, becomes visible or hidden, recreated or rotated.

To create an activity, we need to create a Java class and extend it from the `Activity` superclass. Here is an example of `MainActivity` in the `com.travelblog` package.

This lesson explains what Android activity is. 

Android Ecosystem

Hello World

Travel Blog - Login Screen

Travel Blog - Details Screen

Travel Blog - List Screen

Travel Blog - Search & Sort

Travel Blog - Offline

Conclusion

Activity