How to call onBackPressed in MainActivity which extends Fragment in android?

Question

I am developing an app in which MainActivity extends Fragment. Here is I need to call onBackPressed for some usage. How can I achieve this?

I used below code which does not worked

class MainActivity extends Freagment{
.
.
.
.

Override
public void onBackPressed() {
    super.onBackPressed();
}
}

The previous page is just like this

class LoadWebData extends Activity
{
.
.
.
}

http://stackoverflow.com/questions/5448653/how-to-implement-onbackpressed-in-android-fragments — Ravin, Dec 09 '15 at 05:34

slenderm4n · Answer 1 · 2015-12-09T06:18:27.920

you can add the particular fragment to the backstack by calling addToBackStack method. take a look at this example.

MyDetailFragment myDetailFragment = new MyDetailFragment();
myDetailFragment.setArguments(bundle);
FragmentTransaction fragmentTransaction =
getActivity().getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.phone_container, myDetailFragment);

/*
 * Add this transaction to the back stack. 
 * This means that the transaction will be remembered after it is 
 * committed, and will reverse its operation when later popped off 
 * the stack.
 */
fragmentTransaction.addToBackStack(null);

fragmentTransaction.commit();

score 0 · Answer 2 · edited Dec 09 '15 at 05:37

0

Fragments do not listen to on back pressed. A common pattern I have seen used is interacting with the fragment manager from the activity to pop fragments when on back pressed is fired.... see code below!

@Override
public void onBackPressed() {

final FragmentManager fragmentManager = getFragmentManager(); 
final int count = fm.getBackStackEntryCount();

if (count == 0) {
    super.onBackPressed();
} else {
    fm.popBackStack();
}
}

edited Dec 09 '15 at 05:37

Piyush

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answered Dec 09 '15 at 05:37

fergdev

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sorry. it didnt helped me – The Bala Dec 09 '15 at 05:46
For this to work your fragment transactions need to be added to the backstack. – fergdev Dec 09 '15 at 05:50
please can you say how to do it? – The Bala Dec 09 '15 at 05:54
FragmentTransaction fragmentTransaction = getActivity().getFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.myid, myFragment); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); – fergdev Dec 09 '15 at 05:59

How to call onBackPressed in MainActivity which extends Fragment in android?

2 Answers2