private void initViews() { // Bottom bar BottomNavigationView bottomNavigationView = findById(this, bottom_navigation_view); bottomNavigationView.setOnNavigationItemSelectedListener(new OnNavigationItemSelectedListener() { @Override public boolean onNavigationItemSelected(@NonNull MenuItem item) { switch (item.getItemId()) { case R.id.tab_iss_location: contentViewPager.setCurrentItem(ISS_LOCATION_FRAGMENT_POSITION, false); break; case R.id.tab_people_in_space: contentViewPager.setCurrentItem(PEOPLE_IN_SPACE_FRAGMENT_POSITION, false); break; case R.id.tab_iss_pass_times: contentViewPager.setCurrentItem(ISS_PASS_TIMES_FRAGMENT_POSITION, false); break; } return true; } }); // ViewPager FragmentPagerAdapter mainPagerAdapter = new MainPagerAdapter(getSupportFragmentManager()); contentViewPager.setAdapter(mainPagerAdapter); }