Android : press on the notification and open an activity where the full notification is shown

i m using parse push notification...i m getting notification from parse but Since the message was not fully displayed on android, I decided to press on the notification and open an activity where the full notification is shown. We must get the "alert" and "title" from JSON and place each one of them in a TextView, but I do not know how to get the text from JSON. Can anyone help? Thanks in advance.