Respond to system events while the user touches the screen

  1. Import the following classes:
    • net.rim.device.api.ui.TouchEvent
    • net.rim.device.api.ui.Field
    • net.rim.device.api.ui.Manager
    • net.rim.device.api.ui.Screen
    • net.rim.device.api.ui.component.Dialog
  2. Create a class that extends the Manager class, the Screen class, the Field class, or one of the Field subclasses.
    public class newButtonField extends ButtonField {
  3. In your implementation of the touchEvent(TouchEvent message) method, invoke TouchEvent.getEvent().
  4. Check if the value that TouchEvent.getEvent() returns is equal to TouchEvent.CANCEL.
    protected boolean touchEvent(TouchEvent message) {
    switch(message.getEvent()) {
      case TouchEvent.CANCEL:
       Dialog.alert("System event occurred while processing touch events");
        return true;
       }
     return false;                 
    }

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