Android™ How to Program, Second Edition

5.5. MainActivity Class

Class MainActivity (Figs. 5.18–Fig. 5.23) hosts the app’s QuizFragment when the app is running in portrait orientation, and hosts both the SettingsFragment and QuizFragment when the app is running on a tablet in landscape orientation.

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 1   // MainActivity.java 2   // Hosts the QuizFragment on a phone and both the 3   // QuizFragment and SettingsFragment on a tablet 4   package com.deitel.flagquiz; 5  6   import java.util.Set; 7  8   import android.app.Activity; 9   import android.content.Intent;10   import android.content.SharedPreferences;11   import android.content.SharedPreferences.OnSharedPreferenceChangeListener;12   import android.content.pm.ActivityInfo;                                    ...