3 Tip Calculator App

Objectives

In this chapter you’ll:

  • Change the default GUI theme.

  • Customize the GUI theme’s colors.

  • Design a GUI using a GridLayout.

  • Use the IDE’s Component Tree window to add views to a GridLayout.

  • Use TextViews, an EditText and a SeekBar.

  • Use Java object-oriented programming capabilities, including classes, objects, interfaces, anonymous inner classes and inheritance to add functionality to an app.

  • Programmatically change the text in a TextView.

  • Use event handling to respond to user interactions with an EditText and a SeekBar.

  • Specify that the keypad should display by default when the app executes.

  • Specify that the app supports only portrait orientation.

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