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+# Preferences
+
+### Introduction
+
+Learn to access and operate local application data based on preferences. The display effect is as follows:
+
+![image](screenshots/device/preference.en.gif)
+
+### Concepts
+
+- Preferences: a module that provides APIs for processing data in the form of key-value (KV) pairs, including querying, modifying, and persisting KV pairs. The key is a string, and the value can be a number, a string, a Boolean value, or an array of them.
+- TextInput: a component that provides single-line text input.
+- Button: a component used to quickly create buttons of different styles.
+
+### Permissions
+
+N/A
+
+### How to Use
+
+1. In the Fruit and Number text boxes, enter the corresponding fruit name and quantity, and tap the **Write DB** button to save the entered data to the preferences.
+2. Exit the app and open it again. The data saved last time is displayed in the Fruit and Number text boxes.
+3. Tap the **Read DB** button. The data saved last time is displayed in the Fruit and Number text boxes.
+4. Tap the **Delete DB File** button. The data in the Fruit and Number text boxes is cleared, and the data in the preferences and the corresponding database file is deleted.
+
+### Constraints
+
+1. The sample app is supported only on Huawei phones running the standard system.
+2. HarmonyOS: HarmonyOS NEXT Developer Beta 1 or later
+3. DevEco Studio: DevEco Studio NEXT Developer Beta 1 or later
+4. HarmonyOS SDK: HarmonyOS NEXT Developer Beta 1 SDK or later
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