Layout
After adding the dependency, let's write layout file such as res/layout/activity_main.xml.
This time, we'll use only one element ObservableListView.
<com.github.ksoichiro.android.observablescrollview.ObservableListView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
Android-ObservableScrollView provides several types of views that are scroll-able such as ObservableScrollView, ObservableGridView, etc.
And they extend the standard widget (ScrollView, GridView, ...), and they provide some callbacks to get scroll events.
After writing the above layout, you can write animation codes using these callbacks.