Crea una gerarchia di codice Parte di Android Jetpack.

Puoi creare una gerarchia in modo programmatico in onCreatePreferences(). L'esempio seguente mostra un approccio programmatico alla creazione della stessa schermata di preferenza creata tramite XML nella pagina della panoramica. Per creare la schermata in modo programmatico, crea ogni impostazione e imposta le proprietà pertinenti, quindi aggiungila alla schermata delle preferenze:

Kotlin

override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
    val context = preferenceManager.context
    val screen = preferenceManager.createPreferenceScreen(context)

    val notificationPreference = SwitchPreferenceCompat(context)
    notificationPreference.key = "notifications"
    notificationPreference.title = "Enable message notifications"

    val feedbackPreference = Preference(context)
    feedbackPreference.key = "feedback"
    feedbackPreference.title = "Send feedback"
    feedbackPreference.summary = "Report technical issues or suggest new features"

    screen.addPreference(notificationPreference)
    screen.addPreference(feedbackPreference)

    preferenceScreen = screen
}

Java

@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
    Context context = getPreferenceManager().getContext();
    PreferenceScreen screen = getPreferenceManager().createPreferenceScreen(context);

    SwitchPreferenceCompat notificationPreference = new SwitchPreferenceCompat(context);
    notificationPreference.setKey("notifications");
    notificationPreference.setTitle("Enable message notifications");

    Preference feedbackPreference = new Preference(context);
    feedbackPreference.setKey("feedback");
    feedbackPreference.setTitle("Send feedback");
    feedbackPreference.setSummary("Report technical issues or suggest new features");

    screen.addPreference(notificationPreference);
    screen.addPreference(feedbackPreference);

    setPreferenceScreen(screen);
}

L'aggiunta di un elemento PreferenceCategory è simile. L'esempio seguente mostra un approccio programmatico alla creazione della schermata delle preferenze visualizzata in Organizzare le impostazioni. Gli elementi secondari vengono aggiunti a PreferenceCategory e non a PreferenceScreen principale.

Kotlin

override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
    val context = preferenceManager.context
    val screen = preferenceManager.createPreferenceScreen(context)

    val notificationPreference = SwitchPreferenceCompat(context)
    notificationPreference.key = "notifications"
    notificationPreference.title = "Enable message notifications"

    val notificationCategory = PreferenceCategory(context)
    notificationCategory.key = "notifications_category"
    notificationCategory.title = "Notifications"
    screen.addPreference(notificationCategory)
    notificationCategory.addPreference(notificationPreference)

    val feedbackPreference = Preference(context)
    feedbackPreference.key = "feedback"
    feedbackPreference.title = "Send feedback"
    feedbackPreference.summary = "Report technical issues or suggest new features"

    val helpCategory = PreferenceCategory(context)
    helpCategory.key = "help"
    helpCategory.title = "Help"
    screen.addPreference(helpCategory)
    helpCategory.addPreference(feedbackPreference)

    preferenceScreen = screen
}

Java

@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
    Context context = getPreferenceManager().getContext();
    PreferenceScreen screen = getPreferenceManager().createPreferenceScreen(context);

    SwitchPreferenceCompat notificationPreference = new SwitchPreferenceCompat(context);
    notificationPreference.setKey("notifications");
    notificationPreference.setTitle("Enable message notifications");

    PreferenceCategory notificationCategory = new PreferenceCategory(context);
    notificationCategory.setKey("notifications_category");
    notificationCategory.setTitle("Notifications");
    screen.addPreference(notificationCategory);
    notificationCategory.addPreference(notificationPreference);

    Preference feedbackPreference = new Preference(context);
    feedbackPreference.setKey("feedback");
    feedbackPreference.setTitle("Send feedback");
    feedbackPreference.setSummary("Report technical issues or suggest new features");

    PreferenceCategory helpCategory = new PreferenceCategory(context);
    helpCategory.setKey("help");
    helpCategory.setTitle("Help");
    screen.addPreference(helpCategory);
    helpCategory.addPreference(feedbackPreference);

    setPreferenceScreen(screen);
}