Core Principles and Application PracticeS of AndroidX Preference Framework

The core principles and application practice of the AndroidX Preference framework AndroidX Preference is a powerful library for creating a user settings interface in Android applications.It provides a simple and customized way to manage and display the application option of the application.This article will introduce the core principles of the AndroidX Preference framework and how to use it in practical applications. 1. Core principle: 1. Theme and style: AndroidX Preference uses themes and styles to define the appearance and feeling of the premiere.You can customize these themes and styles according to the needs of the application. 2. XML layout: The first option interface is defined by using the XML layout file.You can use various layout components, such as PreferenceCategory and PreferenceScreen to organize and display the premiere. 3. Sharedpreferences: AndroidX Preference uses sharedpreferences to store and manage the values of the premiere.This is the preferred method for preserving and reading data in the Android framework. 4. PreferenceFragment: PreferenceFragment is one of the core categories of AndroidX Preference.It is responsible for loading the first option interface and interacts with SharedPreferences. 5. Preference class: AndroidX Preference provides many different types of Preference classes for display and processing various settings options.Such as CheckBoxPreference, ListPreference, and EdittextPreference.You can choose the appropriate Preference class as needed and customize according to the needs. 2. Application practice: 1. Add dependencies: To use the AndroidX Preference library in the application, you need to add dependencies to the Build.gradle file first.Add the following code to Dependencies block: implementation 'androidx.preference:preference:1.1.1' 2. Create the first option interface: Create a new XML file in the res/xml directory to define the premiere layout.In this file, you can use various Preference tags to create and organize the preferences. For example, the following code creates a PreferenceScreen that contains two CheckBoxPreference: <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> <CheckBoxPreference android:key="pref_key_sound" Android: Title = "Enable Sound" Android: Summary = "Whether to enable sound effects" /> <CheckBoxPreference android:key="pref_key_vibrate" Android: Title = "Enable Vibration" Android: Summary = "Whether to enable vibration feedback" /> </PreferenceScreen> 3. Create PreferenceFragment: Create a class that inherits from PreferenceFragment and loads the XML layout file created before.By calling the AddPreferencesFromresource method, you can associate the layout file with the PreferenceFragment. public class MyPreferenceFragment extends PreferenceFragment { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.preferences); } } 4. Use PreferenceFragment in the event: Use FragmentManager in your activities to add PreferenceFragment to the content view of the event. public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); getFragmentManager().beginTransaction() .replace(android.R.id.content, new MyPreferenceFragment()) .commit(); } } This will display the first option interface in your activity and save the value of the premiere in SharedPreferences. By understanding the core principles and correct use methods of the AndroidX Preference framework, you can easily create and manage complex user settings interface.According to the needs of the application, you can create a setting page that meets your application style by customizing themes, styles, and the premiere.