How to disable scrolling of AppBarLayout in CoordinatorLayout?

Question

I have MapFragment with parallax effect inside AppBarLayout:

I want to disable scrolling on AppBarLayout, because it is not possible to move across map, since touch evenys on the map are always handled as scroll events. I would like to handle collapsing of AppBarLayout by scrolling RecyclerView only, which is on the bottom of the screen.

This is my xml:

<?xml version="1.0" encoding="utf-8"?> 

<android.support.design.widget.AppBarLayout     android:id="@+id/appbar"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitsSystemWindows="true"     android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">      <android.support.design.widget.CollapsingToolbarLayout         android:id="@+id/collapsing_toolbar"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:fitsSystemWindows="true"         app:contentScrim="@color/white"         app:expandedTitleMarginEnd="64dp"         app:expandedTitleMarginStart="48dp"         app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"         app:titleEnabled="false">          <FrameLayout             android:layout_width="match_parent"             android:layout_height="wrap_content"             app:layout_collapseMode="parallax"             android:fitsSystemWindows="true">              <fragment                 android:id="@+id/map"                 android:name="com.androidmapsextensions.SupportMapFragment"                 android:layout_width="match_parent"                 android:layout_height="match_parent" />         </FrameLayout>          <android.support.v7.widget.Toolbar             android:id="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="73dp"             app:contentInsetLeft="0dp"             app:contentInsetStart="0dp"             app:layout_collapseMode="pin"             app:popupTheme="@style/ThemeOverlay.AppCompat.Light">              <include                 android:id="@+id/search_bar"                 layout="@layout/layout_searchbar" />         </android.support.v7.widget.Toolbar>          <View             android:id="@+id/toolbar_shadow"             android:layout_width="match_parent"             android:layout_height="3dp"             android:layout_below="@id/search_bar"             android:layout_gravity="bottom"             android:background="@drawable/toolbar_dropshadow"             android:visibility="gone" />     </android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout>   <RecyclerView     android:id="@+id/farm_list"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@android:color/transparent"     app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

Thank you for the response.

Answer 1

I'm not sure I got it, but I think you are looking for a DragCallback.

The DragCallback interface allows to choose whether the sibling scrolling view should be controlled by scrolls onto the AppBarLayout.

You can define one by calling:

CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams(); AppBarLayout.Behavior behavior = (AppBarLayout.Behavior) params.getBehavior(); behavior.setDragCallback(new AppBarLayout.Behavior.DragCallback() {     @Override     public boolean canDrag(@NonNull AppBarLayout appBarLayout) {         return false;     } }); 

By always returning false, your scrolling view will not be controlled by the ABL any longer.

Note: before calling this you should check that ViewCompat.isLaidOut(appBarLayout), otherwise params.getBehavior() will return null.