Programmatically go back to the previous fragment in the backstack

Question

Look at the getFragmentManager().popBackStack() methods (there are several to choose from)

http://developer.android.com/reference/android/app/FragmentManager.html#popBackStack()

To elaborate on the other answers provided, this is my solution (placed in an Activity):

@Override
public void onBackPressed(){
    FragmentManager fm = getFragmentManager();
    if (fm.getBackStackEntryCount() > 0) {
        Log.i("MainActivity", "popping backstack");
        fm.popBackStack();
    } else {
        Log.i("MainActivity", "nothing on backstack, calling super");
        super.onBackPressed();  
    }
}

When we are updating/add the fragments,

Should Include the .addToBackStack().

getSupportFragmentManager().beginTransaction()
    .add(detailFragment, "detail") // Add this transaction to the back stack (name is an optional name for this back stack state, or null).
    .addToBackStack(null)
    .commit();

After that if we give the getFragments.popBackStackImmediate() will return true if we add/update the fragments, and move back to the current screen.

Android Navigation architecture component.

The following code works for me:

findNavController().popBackStack()

These answers does not work if i don't have addToBackStack() added to my fragment transaction but, you can use:

getActivity().onBackPressed();

from your any fragment to go back one step;