Our first fragment app

Let's build a fragment in its simplest possible form so that we can understand what is going on, before we start producing Fragment objects all over the place that are of genuine use.

Tip

I urge all readers to go through and build this project. There is a lot of jumping around from file to file, and just reading the instructions alone can make it seem more complex than it really is. Certainly, you can copy and paste the code from the download bundle, but please also follow the steps, and create your own projects and classes. Fragments are not too tough, but their implementation, like their name suggests, is a little fragmented.

Create a new project called Simple Fragment using the Empty Activity template and leave the rest of the settings at their defaults.

Note that there is the option to create a project with a fragment, but we will learn more by doing things ourselves from scratch.

Switch to activity_main.xml and delete the default Hello world! TextView.

Now,...