understanding how a view is set - android

understanding how a view is set - android

I am trying to understand the android bootstrap source code. So in some
activity : I found something like
pager.setAdapter(new BootstrapPagerAdapter(getResources(),
getSupportFragmentManager()));
indicator.setViewPager(pager);
pager.setCurrentItem(1);
where pager is referenced as @InjectView(R.id.some_id) ViewPager pager; and
public class BootstrapPagerAdapter extends FragmentPagerAdapter {
private final Resources resources;
// ...
public BootstrapPagerAdapter(Resources resources, FragmentManager
fragmentManager) {
super(fragmentManager);
this.resources = resources;
}
//...
and some methods latter
public Fragment getItem(int position) {
Bundle bundle = new Bundle();
switch (position) {
case 0:
NewsListFragment newsFragment = new NewsListFragment();
newsFragment.setArguments(bundle);
return newsFragment;
//...
In fact, I noticed that the NewsListFragment fragment is the one (the view
of which is the first displayed) used at first when I launch the ADB, but
I can't understand how this method getItem is called (the same way I don't
understand where setCurrentItem() method is called). Could someone help ?