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github: https://github.com/GinaHsu/ud851-GinaExercises/commit/7c7d40661445421ed3642eae266749c02db78585

• Add the gradle dependency for the support preference fragment
• Create the SettingsFragment class that extends PreferenceFragmentCompat

public class SettingsFragment extends PreferenceFragmentCompat {
}

• Create the pref_visualizer in res->xml
• Add a CheckBoxPreference to the preference

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <CheckBoxPreference
        android:defaultValue="true"
        android:key= "show+bass"
        android:summaryOff="Hidden"
        android:summaryOn="Shown"
        android:title= "Show Bass"/>
</PreferenceScreen>

• Call addPreferencesFromResource method to add the preference file

public class SettingsFragment extends PreferenceFragmentCompat {

    @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
        addPreferencesFromResource(R.xml.pref_visualizer);

    }
}

• Add a preference theme to styles.xml

<item name= "preferenceTheme">@style/PreferenceThemeOverlay </item>