How to disable CollapsingToolbar's collapse when scroll has not content?

Question

I am using android support design 'com.android.support:design:22.2.1' my problem is that when the scroll has no content in it, the collapsing toolbar still enables the collapse action. I need to remove the collapsing of the view if the scroll has no content in it.

My XML :

  <android.support.design.widget.CoordinatorLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:app="http://schemas.android.com/apk/res-auto"
            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:fitsSystemWindows="true"
                android:background="@android:color/white"
                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="match_parent"
                    android:fitsSystemWindows="true"
                    app:contentScrim="?attr/colorPrimary"
                    app:expandedTitleMarginEnd="64dp"
                    app:expandedTitleMarginStart="48dp"
                    app:layout_scrollFlags="scroll|exitUntilCollapsed">

                    <fragment
                        android:id="@+id/pawfile_header"
                        android:name="com.lightbulb.pawesome.fragments.PawfileHeaderFragment"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="10dp"
                        android:layout_marginTop="10dp"
                        android:fitsSystemWindows="true"
                        app:layout_collapseMode="parallax" />

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

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

            <fragment
                android:id="@+id/pawfile_timeline"
                android:name="com.lightbulb.pawesome.user_timeline.PawesomeUserTimelineFragment"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

UDPATE QUESTION:

I'm done with disabling and enabling the collapsing of the view. I used this line of code in order to disable the collapsing:

AppBarLayout.LayoutParams appbarParams = (AppBarLayout.LayoutParams)     collapsingToolbar.getLayoutParams();
appbarParams.setScrollFlags(0);
collapsingToolbar.setLayoutParams(p);

The problem is that the appbar is force to have the elevation of the scrollflags is set to 0. I tried using appbar.setElevation(0) but it has no effect. how can I remove the elevation from my appbar?

There is a nice comment here https://stackoverflow.com/q/32398500/2506817: "When I use a `NestedScrollView` (with `wrap_content` attribute) as main container and a `TextView` as child, the `AppBarLayout` works properly and does not scroll." — Tanasis, Dec 13 '18 at 19:00
Please check this answer [custom scrolling view behavior](https://stackoverflow.com/a/62774587/9947711) — Vasil Stolyarchuk, Jul 07 '20 at 12:39
Please check this answer [custom scrolling view behavior](https://stackoverflow.com/a/62774587/9947711) — Vasil Stolyarchuk, Jul 07 '20 at 12:40

score 29 · Accepted Answer · answered Sep 14 '15 at 05:38

29

get your appbarlayout reference and set the setScrollFlags.

AppBarLayout.LayoutParams p = (AppBarLayout.LayoutParams) toolbar.getLayoutParams();
p.setScrollFlags(0);
toolbar.setLayoutParams(p);

answered Sep 14 '15 at 05:38

rKrishna

1,350
12
22

3

this is helpful! but how can I turn back the collapsing – Earwin delos Santos Sep 14 '15 at 06:59
1

update the same refer https://developer.android.com/reference/android/support/design/widget/AppBarLayout.LayoutParams.html#setScrollFlags(int) – rKrishna Sep 14 '15 at 07:01
2

oww I cant bring back the collapsing of the view... setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) but cant enable the collapse – Earwin delos Santos Sep 14 '15 at 07:10
2

try this setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS); – rKrishna Sep 14 '15 at 07:19
1

how can remove the elevation form the appbar? when I set the scroll flag to 0, eventually the appbar will show an elevation. – Earwin delos Santos Sep 15 '15 at 03:57
Please see this http://stackoverflow.com/questions/12246388/remove-shadow-below-actionbar – rKrishna Sep 15 '15 at 04:32
setElevation has no effect – Earwin delos Santos Sep 16 '15 at 03:10
you can bring back the collapsing view : first get scroll flag before setting it to 0 and when you want collpasing back set initial scroll flag you saved earlier – kundan roy Mar 16 '16 at 06:33
This does not work as intended because it removes app:behavior_overlapTop effect. – Yaroslav Mytkalyk Dec 20 '16 at 20:04
How do I prevent the CollapsingToolbarLayout from being expanded when using this? It does work by not causing it to expand/collapse when I scroll in the RecyclerView, but it also force it to be expanded. – android developer Jun 12 '17 at 08:37

score 3 · Answer 2 · edited May 23 '17 at 11:54

3

Try appbarParams.setScrollFlags(-1); and appBarLayout.setExpanded(true, true) to remove the elevation.

And if you have recyclerView in the fragment, try recyclerView.setNestedScrollingEnabled(false);

Need to disable expand on CollapsingToolbarLayout for certain fragments

edited May 23 '17 at 11:54

Community

1
1

answered Nov 24 '16 at 20:04

Flatout

69
2
7

`setScrollFlags` held the toolbar in and expanded state. `setNestedScrollingEnabled` enables to retain the position. this is the cleanest solution for me. – Samuel Jun 15 '17 at 08:01
1

Can you explain why appBarLayout.setExpanded(true, true) removes the elevation? Because for me it doesn't. – janosch Dec 04 '18 at 17:15

score -2 · Answer 3 · answered Sep 29 '16 at 14:13

-2

To stop collapse of collapsingtoolbar dont give

app:layout_scrollFlags="scroll|exitUntilCollapsed" in the XML file..You can remove that code

answered Sep 29 '16 at 14:13

Debarshi Banerjee

13
1

3

Bad council. Then it will not collapse even if there is content to scroll. – Bringoff Aug 31 '17 at 07:56

Aditya Naique · Answer 4 · 2015-09-14T05:57:59.443

By "scroll has no content in it", I take it that you mean "there is no fragment". For that, I think you'll have to first change the <fragment> to a <FrameLayout> , then add the fragment programatically using getFragmentManager().beginTransaction() , and then check if the fragment is present (i.e. not null) like so:

    if (getFragmentManager().findFragmentById(R.id.fragment_name) != null) { 
           // here try RKNP's code to disable the appBar from collapsing 
    }

How to disable CollapsingToolbar's collapse when scroll has not content?

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