How to clear fragmentManager back stack without poping fragments?

Question

Simple question but seems impossible to answer... How to clear fragmentManager back stack without poping fragments?

I understand it like this:

Back stack entries = list of previosly saved transactions with addToBackStack command. For example: "replace Fragment 1 with Fragment 2".

popBackStack = do last saved transatcion reverse. For example: "replace Fragment 2 with Fragment 1".

Let's say i did first transaction: F1->F2 and added this transaction to back stack. When I press back button now the F2->F1 will happen.

OK...But..

I've changed my mind and I want to clear the back stack. I want the user to work with F2 fragment but when he/she presses back button the Activity should close like the back stack is empty.

I need something like:

for(int i=0;i<getFragmentManager().getBackStackEntryCount();i++){
    getFragmentManager().getBackStackEntryAt(i).remove();
}

EDITED I've tried to ask simple question to complex situation and I get simple answer ;) Abhishek Patel's answer is very good but it is not what I was looking for. Still it's a good answer.

Just to clarify: Back stack in android is not fully editable list like:

• transaction 1
• transaction 2
• transaction 3
• transaction 4

We can't do "Remove transaction 3" to make:

• transaction 1
• transaction 2
• transaction 4

We can't clear all backstack and keep last visible fragment alive.

We can delete backstacks records to certain position like: "Remove everything to Transaction 2" to get:

• transaction 1
• transaction 2

On screen you'll see the efect of transaction 2.

WHY DID I NEED THIS?

I thought that I can make a Fragment which will be 'Main fragment'.This main fragment will use an Interface to tell whatever activity it is in that this boss fragment is shown now, and whatever happens before - is not important anymore.

(F)-Fragment, (A)-Activity

(F) - Hey dude. I'm the boss and I'm visible and attached to you. Please clear your backstack for me but keep my transaction which brought me here.

(A) - Sorry man...You should have told me before your transaction to clear my backstack so I can add your transaction on top of fresh new backstack.

Answer 1

Try This it may be help

public void clearBackstack() {

    BackStackEntry entry = getSupportFragmentManager().getBackStackEntryAt(
            0);
    getSupportFragmentManager().popBackStack(entry.getId(),
            FragmentManager.POP_BACK_STACK_INCLUSIVE);
    getSupportFragmentManager().executePendingTransactions();

}