Gabriele Mariotti Gabriele Mariotti - 5 months ago 166
Android Question

NestedScrollView and CoordinatorLayout. Issue on Scrolling

I have a strange issue with the

CoordinatorLayout
and the
NestedScrollView
(with the design support library 22.2.0)

Using a content smaller than
NestedScrollView
I should have a fixed content.
However trying to scroll up and down the content I can obtain that the content is displaced and never again in their own place.

Here a little sample:enter image description here

Here the code:

<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.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways" />

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

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

<FrameLayout
android:paddingTop="24dp"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="@dimen/padding">

</FrameLayout>

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

<android.support.design.widget.FloatingActionButton
android:id="@+id/fab_action"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="16dp"
android:visibility="gone"
android:src="@drawable/ic_done" />

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

Answer

This can also be observed in the cheesesquare demo when removing all but one card in the details fragment.

I was able to solve this (for now) using this class: https://gist.github.com/EmmanuelVinas/c598292f43713c75d18e

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="com.evs.demo.layout.FixedScrollingViewBehavior">
    .....   
</android.support.v4.widget.NestedScrollView>