I tested of my application in my Samsung device. I realized that when I pressed on back button of my device, application does not recall the OnCreate method on previous activity. It just resumes previous activity page only. May I know how can I call onCreate method of previous page when I click on back button. Thanks
To me it sounds like you are opening a second activity to get some information and then applying the changes to the previous activity.
http://developer.android.com/training/basics/intents/result.html
If not you should look at the Activity lifecycle so that you understand where to put your update code:
http://developer.android.com/reference/android/app/Activity.html