TwoBindingActivity display two parallel fragments, EditFragment(Yellow) and ViewingFragment(Green), both fragment use same viewModel where data entered in EditFragment are observed into ViewingFramgment. Example contians : EditText, Visibility trigger,SeekBar and Spinner

You can also reference attributes on other Views:

 <layout ...>
  <data>
    <import type="android.view.View"/>
  </data>
  <RelativeLayout ...>
    <CheckBox android:id="@+id/seeAds" .../>
    <ImageView android:visibility="@{seeAds.checked ? View.VISIBLE : View.GONE}" .../>
  </RelativeLayout>
</layout>

In the above, whenever the checked state of CheckBox changes, the ImageView’s visibility will change. No need to attach a listener on your own! This kind of expression only works with attributes that support 2-way data binding and those that have binding expressions. halfthought blog , code example