TouchEvent with Display in android -

here's code:

display display; ......... public boolean ontouchevent(motionevent event) { // todo auto-generated method stub float x = event.getx(); float y = event.gety();      int height = display.getwidth(); ......... } 

every time include "int height = display.getwidth();" when testing app. program crashes. seems every time call method display app crashes.

initialize display below

    windowmanager wm = (windowmanager) ctx             .getsystemservice(context.window_service);     display display = wm.getdefaultdisplay();