android - Espresso, scrolling not working when NestedScrollView or RecyclerView is in CoordinatorLayout -


it looks coordinatorlayout breaks behaviour of espresso actions such scrollto() or recyclerviewactions.scrolltoposition().

issue nestedscrollview

for layout one:

<android.support.design.widget.coordinatorlayout     android:layout_width="match_parent"     android:layout_height="match_parent">      <android.support.v4.widget.nestedscrollview         android:layout_width="match_parent"         android:layout_height="wrap_content"         app:layout_behavior="@string/appbar_scrolling_view_behavior">          ...      </android.support.v4.widget.nestedscrollview>      <android.support.design.widget.appbarlayout         android:layout_width="match_parent"         android:layout_height="wrap_content" >          ...      </android.support.design.widget.appbarlayout>  </android.support.design.widget.coordinatorlayout>

if try scroll view inside nestedscrollview using viewactions.scrollto() first problem find performexception. because action supports scrollview , nestedscrollview doesn't extend it. workaround problem explained here, can copy code in scrollto() , change constrains support nestedscrollview. seems work if nestedscrollview not in coordinatorlayout put inside coordinatorlayout scrolling action fails.

issue recyclerview

for same layout, if replace nestedscrollview recyclerview there problems the scrolling.

in case i'm using recyclerviewaction.scrolltoposition(position). unlike nestedscrollview, here can see scrolling happening. however, looks scrolls wrong position. example, if scroll last position, makes visible second last not last one. when move recyclerview out of coordinatorlayout scrolling works should.

at moment can't write espresso test screens use coordinatorlayout due issues. experiencing same problems or knows workaround?

this happening because espresso scrollto() method explicitly checks layout class , works scrollview & horizontalscrollview. internally it's using view.requestrectangleonscreen(...) i'd expect work fine many layouts.

my workaround nestedscrollview take scrolltoaction , modify constraint. modified action worked fine nestedscrollview change.

changed method in scrolltoaction class: 

public matcher<view> getconstraints() {     return allof(witheffectivevisibility(visibility.visible), isdescendantofa(anyof(             isassignablefrom(scrollview.class), isassignablefrom(horizontalscrollview.class), isassignablefrom(nestedscrollview.class)))); }

convenience method: 

public static viewaction betterscrollto() {     return viewactions.actionwithassertions(new nestedscrolltoaction()); }

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