Building a precise UI with ConstraintLayout
Open the ConstraintLayout that was auto-generated when we created the project. It is probably already in a tab at the top of the editor. If not, it will be in the res/layout folder. Its name is activity_main.xml.
Inspect the XML in the Text tab and note that it is empty, apart from a TextView that says Hello World. Switch back to the Design tab, left-click the TextView to select it, and tap the Delete key to get rid of it.
Now we can build ourselves a simple, yet intricate, UI. ConstraintLayout is very useful when you want to position parts of your UI very precisely and/or relative to the other parts.
Adding a CalenderView
To get started, look in the Widgets category of the palette and find the CalenderView ...
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