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Android Collapsing Toolbar not using inertia like Google Play App does

Posted by: admin May 14, 2020 Leave a comment

Questions:

I’m using the Android Design Support Library to create an Activity with a Collapsible Toolbar with a nice fading effect, just like Google Play or Whatsapp’s Contact profile. I will put the activity layout at the end but bear in mind this is just the default Collapsible Activity layout to which I added an ImageView to the AppBarLayout to create the Toolbar <-> Image fade effect.

My problem with this implementation presents itself as 2 symptoms I will describe:

  • The activity content is long, when I want to scroll up quickly with a fast swipe the scroll will stop before expanding the Toolbar. I want it to continue, when I’m at the bottom of my NestedScrollView and I do a quick finger swipe to go all the way to the top of my activity I want this scroll to go and expand the Toolbar, this is the way the Google Play app behaves or Whatsapp’s profile does.

  • Similarly when the Toolbar is expanded there is no inertia to the scroll, a quick swipe down will scroll a tiny bit, again this is not how Google Play or Whatsapp profile behaves. Once the Toolbar is collapsed the scroll behaves as it always has in ScrollViews, ListViews, etc. A quick swipe will allow you to go the bottom or top (unless there is a lot of content).

Is the behaviour I describe supported by the Design Support Library?

activity.xml:

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".ScrollingActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar"
        android:fitsSystemWindows="true"
        android:layout_height="@dimen/app_bar_height_custom"
        android:layout_width="match_parent"
        android:theme="@style/AppTheme.AppBarOverlay">

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

            <ImageView
                android:src="@drawable/cuthbert"
                app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:scaleType="centerCrop"
                app:layout_collapseMode="parallax"
                android:minHeight="100dp"/>

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_height="?attr/actionBarSize"
                android:layout_width="match_parent"
                app:layout_collapseMode="parallax"
                app:layout_scrollFlags="scroll|enterAlways"
                app:popupTheme="@style/AppTheme.PopupOverlay" />
        </android.support.design.widget.CollapsingToolbarLayout>
    </android.support.design.widget.AppBarLayout>

    <include layout="@layout/content_scrolling"/>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/fab_margin"
        app:layout_anchor="@id/app_bar"
        app:layout_anchorGravity="bottom|end"
        android:src="@android:drawable/ic_dialog_email"/>

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

content_scrolling.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/activity_scrolling"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ScrollingActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/text_margin"
        android:text="@string/large_text"/>

</android.support.v4.widget.NestedScrollView>
How to&Answers:

Try to add these lines in :

<android.support.design.widget.CollapsingToolbarLayout
   app:expandedTitleMarginEnd="64dp"
   app:expandedTitleMarginStart="48dp"
   app:expandedTitleTextAppearance="@android:color/transparent"

Answer:

Update support libraries to 26.0.0 ( especially design support library ). They finally fixed this issue after years of complaining.