The working principles of the Java class library in the AndroidX Preference framework (In-Depth Explanation of the Working Principles of Java Class Libraareies in AndroidX Preference Framework)

The AndroidX Preference framework is a powerful tool for creating a setting interface in Android applications.It provides a simple way to display and manage the user's premiere, and automatically handle the user's changes to the first options. The Java class library plays an important role in the AndroidX Preference framework.They provide the necessary APIs and classes to create and configure the first option screen, while processing logic and events related to the premiere. First, let us understand the working principle of the Java class library.An AndroidX Preference setting interface is usually composed of one or more preferred screens, and each screen is represented by a subclass of a preferenceFragmentCompat.PreferenceFragmentCompat is a special Fragment for displaying the premiere. The preferred items in the Java class library are represented by the subclasses of Preference, and they are divided into the following main types: 1. PreferenceCategory: It is used to create a category (group) in the preferred interface.You can use this category to group the relevant premiere. PreferenceCategory category = new PreferenceCategory(context); category.setTitle("Category Title"); 2. EditTextPreference: It is used to create a text input box in the first option interface.Users can enter text and save them into the premiere. EditTextPreference editTextPreference = new EditTextPreference(context); editTextPreference.setTitle("Title"); editTextPreference.setKey("preference_key"); editTextPreference.setDefaultValue("Default Value"); 3. ListPreference: It is used to create a drop -down list in the first option interface.Users can choose a option from the predefined option list and save it into the premiere. ListPreference listPreference = new ListPreference(context); listPreference.setTitle("Title"); listPreference.setKey("preference_key"); listPreference.setEntries(new CharSequence[]{"Option 1", "Option 2", "Option 3"}); listPreference.setEntryValues(new CharSequence[]{"1", "2", "3"}); listPreference.setDefaultValue("1"); 4. CheckBoxPreference: It is used to create a checkbox in the first option interface.Users can open or turn off the check box and save them into the preferred options. CheckBoxPreference checkBoxPreference = new CheckBoxPreference(context); checkBoxPreference.setTitle("Title"); checkBoxPreference.setKey("preference_key"); checkBoxPreference.setDefaultValue(false); 5. SwitchPreference: Similar to CheckBoxPreference, it is used to create a switch button in the premiere interface. SwitchPreference switchPreference = new SwitchPreference(context); switchPreference.setTitle("Title"); switchPreference.setKey("preference_key"); switchPreference.setDefaultValue(false); In addition to the premiere types listed above, the Java class library also provides many other types to meet different prefecture needs. Once the first option is created, we can add them to the PreferenceFragmentCompat and use the SharedPreferences class to save and read the value of the user's preferred option.SharedPreferences is a lightweight key value to the storage class for storing the configuration data of the application. When the value of the preferred option changes, the framework will automatically update the value in the related UI elements and the SharedPreferences.This makes the complex logic of the UI update when the first option is changed. Finally, by calling one or more PreferenceFragmentCompat subcladium setpreferenceScreen methods, we can add the first option screen to the application interface of the application. All in all, the Java class library of the AndroidX Preference framework simplifies the process of creating and managing setting interfaces in Android applications by providing rich premiere type types and related APIs.It provides automatic processing users' changes to the first options and the mechanism of related UI updates, enabling developers to focus more on the core functional development of applications.