在代码中创建层次结构 Android Jetpack 的一部分。

您可以在 onCreatePreferences() 中以编程方式创建层次结构。以下示例演示了以编程方式创建与概述页面上通过XML创建的相同首选项屏幕的方法。要以编程方式创建屏幕，请创建每个设置并设置其相关属性，然后将其添加到首选项屏幕

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);
}

添加 PreferenceCategory 的方法类似。以下示例演示了以编程方式创建在组织您的设置中看到的首选项屏幕的方法。子项添加到 PreferenceCategory，而不是添加到根 PreferenceScreen。

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);
}