3.7. Wrap-Up
In this chapter, you created your first interactive Android app—the Tip Calculator. We overviewed the app’s capabilities, then you test-drove it to calculate standard and custom tips based on the bill amount entered. You followed detailed step-by-step instructions to build the app’s GUI using the Android Developer Tools IDE’s Graphical Layout editor, Outline window and Properties window. We also walked through the code of the Activity subclass MainActivity, which defined the app’s functionality.
In the app’s GUI, you used a GridLayout to arrange the views into rows and columns. You displayed text in TextViews and received input from an EditText and a SeekBar.
The MainActivity class required many Java object-oriented programming ...
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