Clickable CardView inside NestedScroll doesn't trigger scrolling

Question

I have a layout with a CoordinatorLayout, and AppBarLayout and a NestedScrollView, inside the NestedScrollView I have multiple CardViews, everything works ok until I set the CardViews to be clickable, then if I start a scroll within a CardView, scroll doesn't work.

This is my layout:

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_height="256dp"
    android:layout_width="match_parent"
    app:contentScrim="?attr/colorPrimary"
    android:fitsSystemWindows="true"
    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsing_toolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_scrollFlags="scroll|exitUntilCollapsed"
        android:fitsSystemWindows="true"
        app:contentScrim="?attr/colorPrimary">
        <ImageView
            android:id="@+id/backdrop"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:fitsSystemWindows="true"
            app:layout_collapseMode="parallax"/>
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_height="?attr/actionBarSize"
            android:layout_width="match_parent"
            app:layout_collapseMode="pin"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
    </android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
    android:id="@+id/nestedScroll"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    android:layout_gravity="fill_vertical">
    <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="wrap_content"
            app:cardCornerRadius="0dp"
            app:cardUseCompatPadding="true">
            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <View
                    android:layout_width="80dp"
                    android:layout_height="80dp"
                    android:background="@color/primary" />
                <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:paddingTop="4dp"
                    android:paddingLeft="7dp"
                    android:paddingRight="7dp"
                    android:paddingBottom="7dp">
                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:lines="1"
                        android:includeFontPadding="false"
                        android:text="Title1"
                        style="@android:style/TextAppearance.Medium" />
                    <TextView
                        android:lines="2"
                        android:text="Description 1"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content" />
                </LinearLayout>
            </LinearLayout>
        </android.support.v7.widget.CardView>
       ...
    </LinearLayout>
</android.support.v4.widget.NestedScrollView>

Answer 1

The issue comes to daylight when the ScrollView isn't filled with content. I think it's a very weird bug in Android.

The 'solution'..

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_height="256dp"
        android:layout_width="match_parent"
        app:contentScrim="?attr/colorPrimary"
        android:fitsSystemWindows="true"
        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary">

            <ImageView
                android:id="@+id/backdrop"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="centerCrop"
                android:fitsSystemWindows="true"
                app:layout_collapseMode="parallax"/>

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_height="?attr/actionBarSize"
                android:layout_width="match_parent"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        android:id="@+id/nestedScroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_gravity="fill_vertical">

        <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="wrap_content"
                app:cardCornerRadius="0dp"
                app:cardUseCompatPadding="true"
                android:foreground="?android:attr/selectableItemBackground"
                android:clickable="true">

                <LinearLayout
                    android:orientation="horizontal"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <View
                        android:layout_width="80dp"
                        android:layout_height="80dp"
                        android:background="#cdcdcd"
                        android:clickable="true"/>

                    <LinearLayout
                        android:orientation="vertical"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:paddingTop="4dp"
                        android:paddingLeft="7dp"
                        android:paddingRight="7dp"
                        android:paddingBottom="7dp">

                        <TextView
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:lines="1"
                            android:includeFontPadding="false"
                            android:text="Title1"
                            style="@android:style/TextAppearance.Medium"/>

                        <TextView
                            android:lines="2"
                            android:text="Description 1"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            />
                    </LinearLayout>
                </LinearLayout>
            </android.support.v7.widget.CardView>

            <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="1000dp"
            android:orientation="vertical"
            android:layout_margin="4dp"
            android:background="#c1c1c1">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="20pt"
                android:text="some content..."/>
        </LinearLayout>

        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>