How to work with the startActivity method

Hi,
Unable to switch to the new activity which is opened by startActivity() method.

steps:
1)First im making outgoing call,End the call
2)After that im trying to do operations on message application opening the message window .
3)But im unable to do any operations on message app.

@niranjan Can you please paste the piece of code for better understanding of your problem?

Hi sathish,

i got solution for that query.
its synchronization issue.

Watch this video : https://youtu.be/DW5VJzdICF8?list=PLXbcghgSZDroz9nez1IrbL2hnMVJ0ba1W