Hi, 

i made web app which has web site on server-side.  

When I press back button to exit my app, my app moves into index page (index.html)  which is an empty page so I just can see white page, and then it needs to press back button one more for closing app. 

i just want to close my app without through passing any html page, How can I fix this problem? 

Please let me know. Thanks in advance.