Android Programming for Beginners - Second Edition

Device detection mini-app

The best way to learn about detecting and responding to devices and their varying attributes (screens, orientations, and so on) is to make a simple app:

1. Create a new Basic Activity project and call it Device Detection. Leave all the other settings at their defaults.
2. Open the activity_main.xml file in the design tab and delete the default Hello world! TextView.
3. Drag a Button onto the top of the screen and set its onClick property to detectDevice. We will code this method in a minute.
4. Drag two TextView widgets onto the layout, one below the other, and set their id properties to txtOrientation and txtResolution respectively.
5. Check you have a layout that looks something like the following screenshot:

   Tip

   I have stretched my widgets ...