How to create custom attributes for a custom component that can be assigned from XML in HarmonyOS?
In HarmonyOS, creating custom attributes for custom components involves several key steps. HarmonyOS is a brand-new operating system developed by Huawei that supports multiple devices, including smartphones, tablets, and more. In HarmonyOS, custom components typically refer to specific functional or UI components created by developers based on their needs.Step 1: Define Custom AttributesFirst, define the custom attributes in the XML file. Suppose we are creating a custom button and want to add a custom attribute for controlling the corner radius. We can create or modify the XML file in the directory under the folder to define these attributes.Here, we define an attribute named , and specifies that the value is a dimension type, such as or .Step 2: Read Attributes in the Custom ComponentNext, we need to read these attributes in the Java class of the custom component. Suppose our custom button class is named , we need to read the attribute in this class.In this example, we first set a default . Then, we check if the attribute is defined in XML and update the value accordingly. Finally, we use this attribute value in the method to render the rounded button.Step 3: Use Custom Attributes in Layout FilesFinally, we need to use this custom attribute in the layout file. Suppose we have a layout file :Here, we declare the custom namespace using and set the custom attribute .This is the basic process for creating custom attributes for custom components in HarmonyOS. These custom attributes enable developers to flexibly extend component functionality and better meet design and user experience requirements.