Android How to Program, 3/e

3.6 Adding the App’s Logic

Class MainActivity (Figs. 3.12–3.18) implements the Tip Calculator app’s logic. It calculates the tip and total bill amounts, then displays them in locale-specific currency format. To view the file, in the Project window, expand the app/Java/com.deitel.tipcalculator node and double click MainActivity.java. You’ll need to enter most of the code in Figs. 3.12–3.18.

Fig. 3.12 MainActivity’s package and import statements

Figure 3.12 Full Alternative Text

Fig. 3.18 Anonymous inner class that implements interface TextWatcher

Figure 3.18 Full Alternative Text

3.6.1 package and import Statements

Figure 3.12 shows the package ...