Its similar to the Launcher Background effect, when user switch between fragments, the background will scroll within specific ratio to cover all fragments.
checkout the code, it includes a sample, just replace the background to any image you have.
Simply add your "BackgroundViewPager" into your layout xml, and assign a drawable to it,
<com.infusionapps.widget.BackgroundViewPager
android:id="@+id/flowViewPager1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
flow:image="@drawable/bg5" />
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