janox1x2x3 janox1x2x3 - 1 month ago 24
Android Question

How to disable scrolling of AppBarLayout in CoordinatorLayout?

I have

MapFragment
with parallax effect inside
AppBarLayout
:

enter image description here

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

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.

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