Android How to Program, 3/e

4.6 MainActivity Class

Class MainActivity (Sections 4.6.1–4.6.7) hosts the app’s MainActivityFragment when the app is running in portrait orientation, and hosts both the SettingsActivityFragment and MainActivityFragment when the app is running on a tablet in landscape orientation.

4.6.1 package Statement and import Statements

Figure 4.24 shows the MainActivity package statement and import statements. Lines 6–19 import the various Android and Java classes and interfaces that the app uses. We’ve highlighted the new import statements, and we discuss the corresponding classes and interfaces in Section 4.3 and as they’re encountered in Sections 4.6.2–4.6.7.

Fig. 4.24 MainActivity package statement and import statements

Figure 4.24 Full Alternative ...