How to determine when Fragment becomes visible in ViewPager

Question

Problem: Fragment onResume() in ViewPager is fired before the fragment becomes actually visible.

For example, I have 2 fragments with

Answer 1

A simple way of implementing that is checking whether user is logged in before going to the fragment.

In your MainActivity you may do something like this inside the onNavigationItemSelected method.

 case R.id.nav_profile_side:


                if (User_is_logged_in) {

                    fragmentManager.beginTransaction()
                            .replace(R.id.content_frame
                                    , new FragmentProfile())
                            .commit();
                }else {

                    ShowLoginOrRegisterDialog(fragmentManager);

                }

                break;

However, if you are using navigation drawer, the selection in the drawer will have changed to Profile though we have not gone to the ProfileFragment.

To reset the selection to the current selection run the code below

        navigationView.getMenu().getItem(0).setChecked(true);