| <HTML> |
| <BODY> |
| <p> |
| The widget package contains (mostly visual) UI elements to use |
| on your Application screen. You can also design your own. |
| </p> |
| |
| <p> |
| To create your own widget, extend {@link android.view.View} or a subclass. To |
| use your widget in layout XML, there are two additional files for you to |
| create. Here is a list of files you'll need to create to implement a custom |
| widget: |
| </p> |
| <ul> |
| <li><b>Java implementation file</b> - This is the file that implements the |
| behavior of the widget. If you can instantiate the object from layout XML, |
| you will also have to code a constructor that retrieves all the attribute |
| values from the layout XML file.</li> |
| <li><b>XML definition file</b> - An XML file in res/values/ that defines |
| the XML element used to instantiate your widget, and the attributes that it |
| supports. Other applications will use this element and attributes in their in |
| another in their layout XML.</li> |
| <li><b>Layout XML</b> [<em>optional</em>]- An optional XML file inside |
| res/layout/ that describes the layout of your widget. You could also do |
| this in code in your Java file.</li> |
| </ul> |
| |
| <p> |
| ApiDemos sample application has an example of creating a custom layout XML |
| tag, LabelView. See the following files that demonstrate implementing and using |
| a custom widget: |
| </p> |
| <ul> |
| <li><strong>LabelView.java</strong> - The implementation file</li> |
| <li><strong>res/values/attrs.xml</strong> - Definition file</li> |
| <li><strong>res/layout/custom_view_1.xml</strong> - Layout file</li> |
| </ul> |
| </BODY> |
| </HTML> |
