学步园

http://supportforums.blackberry.com/t5/Java-Development/Unable-to-close-camera-using-EventInjector-for-touch-screen/m-p/785247#M143879

So I believe I have found a way to make this work consistently.  My
issue was not the permissions, as all along I was testing with the
proper permissions set (or by prompting hte user to set them).  The
solution I found is to put a Thread.sleep(500) between the two injected
ESCAPE events as follows:

EventInjector.KeyEvent inject = new EventInjector.KeyEvent(EventInjector.KeyEvent.KEY_DOWN, Characters.ESCAPE, 0);


                inject.post();


                sleep(500);


                inject.post();

 I'm
not exactly sure why this works, and I'm not saying that it's the right
way to solve the problem, but it works for me.  I tried shorter sleep
times but 500ms was the shortest that I could get to consistently work. 
Also, this didn't work when I used the EventInjector.invokeEvent()
method, only with the post() method.  Hope this helps some people out.