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AppBarLayout + NestedScrollView + RecyclerView won't scroll

Hello I have a problem with googleLayout support app my layout structure looks like this:

The problem is my recycler view will not scroll once the scroll at the top of the page is scrolled.

I've tried almost all solutions but nothing works.

<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/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background_gradient_blue"
android:fitsSystemWindows="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">

<android.support.v4.widget.NestedScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nested_scroll_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:nestedScrollingEnabled="false"
        android:padding="8dip">
    </android.support.v7.widget.RecyclerView>

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

<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar"
    style="@style/AppTheme.Toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fitsSystemWindows="true"
    android:theme="@style/AppTheme.AppBarOverlay"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/toolbar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/background_gradient_blue"
        android:fitsSystemWindows="true"
        app:contentScrim="?attr/colorPrimary"
        app:expandedTitleMarginBottom="250dp"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            style="@style/AppTheme.Toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@android:color/transparent"
            app:contentInsetStart="72dp"
            app:layout_collapseMode="pin"
            app:popupTheme="@style/AppTheme.PopupOverlay"/>

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

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

+3
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2 answers


I solved my problem

by enabling nested scrolling

recylcer.nestedScrollingEnabled (True)

and block the recyclerView from scrolling manually, returning it if the appBar is not collapsed



  mAppbarLayout.addOnOffsetChangedListener((appBarLayout, verticalOffset) -> {
        if (Math.abs(verticalOffset) >= appBarLayout.getTotalScrollRange()) {
            //collapsed
            shouldScroll = true;
        } else {
            shouldScroll = false;
        }

    });

    mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recycler, int dx, int dy) {
            // If AppBar is not collapsed, revert the scroll.
            if (!shouldScroll) {
                if(recycler.getChildCount() >= 0){
                    recycler.scrollToPosition(0);
                }
            }
        }
    });

The My Layout structure now looks like this:

<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/coordinator_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background_gradient_blue"
android:fitsSystemWindows="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">

<android.support.v4.widget.NestedScrollView 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/nested_scroll_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="fill_vertical"
    android:fillViewport="true"
    android:scrollbars="none"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <LinearLayout
        android:id="@+id/nested_scrollbar_linear"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:orientation="vertical"
        android:paddingEnd="8dip"
        android:paddingLeft="8dip"
        android:paddingRight="8dip"
        android:paddingStart="8dip">

        <TextView
            android:id="@+id/title_text_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="@color/white"
            android:textSize="13sp"
            android:visibility="gone" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dip"
            android:layout_marginTop="5dip"
            android:clickable="true" />

    </LinearLayout>
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar"
    style="@style/AppTheme.Toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fitsSystemWindows="true"
    android:theme="@style/AppTheme.AppBarOverlay"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/toolbar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/background_gradient_blue"
        android:fitsSystemWindows="true"
        app:contentScrim="?attr/colorPrimary"
        app:expandedTitleMarginBottom="250dp"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            style="@style/AppTheme.Toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@android:color/transparent"
            app:contentInsetStart="72dp"
            app:layout_collapseMode="pin"
            app:popupTheme="@style/AppTheme.PopupOverlay"/>

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

</android.support.design.widget.AppBarLayout>
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Add this line inside nestedScrollView tag



Android: focusableInTouchMode = "true"

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