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Thanks for the report.

Any layout we can use to quickly reproduce the issue?

Hi,
you can try this:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v4.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">

                <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="150dp"
                    app:cardBackgroundColor="#000000">

                </android.support.v7.widget.CardView>

                <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="150dp"
                    app:cardBackgroundColor="#FF0000">

                </android.support.v7.widget.CardView>

                <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="150dp"
                    app:cardBackgroundColor="#000000">

                </android.support.v7.widget.CardView>

                <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="150dp"
                    app:cardBackgroundColor="#FF0000">

                </android.support.v7.widget.CardView>

                <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="150dp"
                    app:cardBackgroundColor="#000000">

                </android.support.v7.widget.CardView>

            </LinearLayout>

        </android.support.v4.widget.NestedScrollView>

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fabUlozitHraca"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end|bottom"
            android:layout_marginBottom="@dimen/activity_horizontal_margin"
            android:layout_marginEnd="@dimen/activity_vertical_margin"
            android:scaleType="center"
            app:fabSize="auto" />

    </android.support.design.widget.CoordinatorLayout>

</LinearLayout>

Problem is only when NestedScrollView is in CoordinatorLayout. When there is no CoordinatorLayout, NestedScrollView is working alright

Thanks for the repro layout!

Vadim, could you have a look? I suspect the CoordinatorLayoutHandler is intercepting the scroll event. We might need to special case a scrollable surface under a CoordinatorLayout

Thanks for reporting the issue and providing a test layout. I've tried to repro it in newer versions of Android Studio (3.2.1 stable) and 3.4 Canary, and it seems to be fixed already. Can you please give it a shot in any of them?

I'm attaching two videos showing the layout you provided being rendered in both the designer and preview tabs. Please note I've added a green block that is not displayed unless you scroll.