Show previous fragment

Question

How to remove current and show previous fragment? Like if I'm press "Back" button

I'm using such construction:

FragmentManager fm=getFragmentManager();
FragmentTransaction ft=fm.beginTransaction();
ft.remove(fragment).commit();

But it just removes current fragment, without showing previous

Answer 1

You have to call FragmentTransaction.addToBackStack(null) where you add the fragment and then call FragmentManager.popBackStack() when you want to remove it.

Answer 2

Add this method in your activity:

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event)  {
        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
            if( this.getFragmentManager().getBackStackEntryCount() != 0 ){
                this.getFragmentManager().popBackStack();
                return true;
            }
            // If there are no fragments on stack perform the original back button event
        }

        return super.onKeyDown(keyCode, event);
    }

Then where you are changing the fragments do this:

FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(android.R.id.content, new YourFragmentName());
transaction.addToBackStack(null); // this is needed for the above code to work
transaction.commit();