You can provide accessibility information about custom UI components that display numeric values, such as progress indicators.

1. Import the required interfaces.

   import net.rim.device.api.ui.accessibility.AccessibleContext;
   import net.rim.device.api.ui.accessibility.AccessibleValue;
   

   AccessibleContext provides the basic accessibility information about a custom UI component. AccessibleValue provides the information about the numeric values in a custom UI component that displays numeric values.
2. Create a class that extends the Field class and implements AccessibleContext and AccessibleValue.

   public class GaugeFieldAccessibleValue extends Field
     implements AccessibleContext, AccessibleValue 
   {
   }
   

3. Create the variables to store the custom UI component's state and contents.

   private int _state;
   private int _min;
   private int _current;    
   private int _max;
   

4. Implement the get() methods of AccessibleValue to provide the information about the numeric values.

   public int getCurrentAccessibleValue() 
   {
     return _current;
   }
   
   public int getMaxAccessibleValue() 
   {
     return _max;
   }
   
   public int getMinAccessibleValue() 
   {
     return _min;
   }