Development Guide

Local Navigation

BlackBerry Manuals & Help  >  Developer Documentation  >  Java Development Guides and API Reference  >  Development Guide UI and Navigation - BlackBerry Java SDK - 7.0

Respond to a user touching the screen in two locations at the same time

  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, check if the following method invocations return values greater than zero: TouchEvent.getX(1), TouchEvent.getY(1), TouchEvent.getX(2), TouchEvent.getY(2). 
    protected boolean touchEvent(TouchEvent message) {
   switch(message.getEvent()) {
   case TouchEvent.MOVE:
      if(message.getX(1) > 0 && message.getY(1) > 0) {
         Dialog.alert("First finger touched/moved");
      }
      if(message.getX(2) > 0 && message.getY(2) > 0) {
         Dialog.alert("Second finger touched/moved");
      }
      return true;
   }
   return false;
}
Next topic: Pinch gestures
Previous topic: Respond to a scroll action

Was this information helpful? Send us your comments.