Use Tab layout in MVVM architecture with the data binding library

Question

I am developing an app that has a tab layout as the image.

I’d like to use MVVM architecture with data binding library but I am new with this framework.

Answer 1

I'm not sure if this is newly introduced recently but with Android Support version 27.1.1, you don't even even need a custom data binding adapter, you can simply use:

Take note that the viewPager variable in app:setupWithViewPager="@{some_fragment_viewpager}" points to android:id="@+id/some_fragment_viewpager". That's how the reference to the ViewPager is done (like magic I know)!

ViewModel

public class SomeViewModel {
  public ViewPager.OnPageChangeListener pageChangeListener;
  public SomeFragmentPagerAdapter pagerAdapter;
  // ...
}

FragmentPagerAdapter

public classs SomeFragmentPagerAdapter extends FragmentPagerAdapter {
  public Boolean currentPosition;
}