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Android Nested Scrollview not scrolling

I am having a Nested ScrollView which contains contents inside a Linear Layout.

 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:CoverFlowPager="http://schemas.android.com/apk/res-auto"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.widget.NestedScrollView
        android:id="@+id/scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="10dp"
        android:clipToPadding="false"
        android:fillViewport="true"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

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

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

</FrameLayout>

I have this layout inside a ViewPager and ViewPager is inside a CordinatorLayout.

<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">

Now when I scroll the view the view is not scrolling. But since the layout is placed inside the Cordinator layout its moving up till the ToolBar is hid. But its not scrolling up.

Here is my main activity xml, The view pager is inside a tabbed layout.

<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">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

           <android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:app="http://schemas.android.com/apk/res-auto"
                xmlns:attrs="http://schemas.android.com/apk/res-auto"
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:layout_scrollFlags="scroll|enterAlways"
                app:popupTheme="@style/AppTheme.PopupOverlay">

            <FrameLayout
                android:id="@+id/titleContainer"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"    
                android:gravity="center">

                <com.CustomFontTextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:text="Toolbar Title"
                    android:textColor="#ffffff"
                    attrs:customFont="handyman_bold"
                    android:textSize="8pt"
                    android:layout_marginLeft="-20dp"
                    android:id="@+id/toolbar_title"/>
            </FrameLayout>

            <ImageButton
                android:id="@+id/btn_ToolBarRightBtn"
                android:layout_width="32dp"
                android:layout_height="28dp"
                android:tag="0"
                android:background="@null"
                android:scaleType="fitXY"
                android:src="@drawable/icon_shopping"
                android:layout_alignParentRight="true"
                android:layout_gravity="right"
                android:layout_marginRight="10dp"
                />   

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

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

    <android.support.v4.view.ViewPager
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_gravity="bottom"
        android:background="@color/offwhite"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

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

Here is my screenshots,

Initial View enter image description here

When view is scrolled up, it scrolls only to hide the top navigation bar. Its not scrolling to display the items below the tab bar,

enter image description here

like image 615
Zach Avatar asked May 20 '16 20:05

Zach


People also ask

How to use nested scroll view in Android?

NestedScrollView is just like ScrollView, but it supports acting as both a nested scrolling parent and child on both new and old versions of Android. It is enabled by default. NestedScrollView is used when there is a need for a scrolling view inside another scrolling view.

What is fillViewPort in scrollView?

fillViewport allows scrollView to extend it's height equals to the full height of device screen's height in the cases when the child of scroll view has less height.

How do I use NestedScrollView in ConstraintLayout?

Just add the fillViewPort parameter to your NestedScrollView . Like that the ConstraintLayout will expand just as you'd set its width to match_parent and the RecyclerView will dynamically expand its size.


1 Answers

app:layout_behavior="..." should be set on a direct child of CoordinatorLayout. If your ViewPager is a direct child of CoordinatorLayout, place it to ViewPager declaration.

like image 178
Artem Ufimtcev Avatar answered Oct 11 '22 13:10

Artem Ufimtcev