How to stop loading data again while using intent to navigate activity?

Question

I have three activities in my application ... I use an intent to navigate between the activities. My third activity contains a method that fetch data from a web service. When I press back button on the 3rd activity I go back to the second activity. But when I again come to 3rd activity from the second activity it starts downloading data again. Please help me!

I am using handler in my 3rd screen..

Second activity uses following code

Intent intent=new Intent(Screen2.this,Screen3.class);
startActivity(intent);

Thanks in advance guys.

Answer 1

Try this link: Android Intents - Tutorial.
Using this tutorial

startActivityForResult(); 

Answer 2

Make use of savedInstance bundle....

Get more info from

Saving Android Activity state using Save Instance State

Answer 3

First finish the second activity moving to the third activity.

From third activity call the second activity