Restore listView in android

I am navigating from Activity_A to Activity_B and showing a list view in Activity_B , when I press back button in Activity_B control comes to Activity_A. Now, again I navigate to Activity_B, now I dont want to create the list View once again instea开发者_如何学JAVAd I want to show the list View previously created. How to do this ? Any one please help me...

Thanks in advance....

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when you start Activity_B set the Flag

FLAG_ACTIVITY_REORDER_TO_FRONT

Intent intent = new Intent(Activity_A.this, Activity_B.class);

intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

startActivity(intent);

this flag will cause the launched activity to be brought to the front of its task's history stack if it is already running.

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You need to save your Activity's state.

http://developer.android.com/guide/topics/fundamentals/tasks-and-back-stack.html