Setting app:layout_behavior programmatically

Question

I have a coordinator layout with a recyclerview which I would like to add programmatically. The reason why it's added programatically is because different fragments which inflate the coordinator layout, may use different types of recyclerviews.

Typically for a recyclerview, in order to set this behaviour I would add it in the xml:

app:layout_behavior="@string/appbar_scrolling_view_behavior"

That works fine. However, I'm at a complete loss as to how to add this behavior when I create the recyclerviews programmatically and then add them to the framelayout:

<?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:id="@+id/coordLayout"
    android:layout_height="match_parent" android:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <android.support.design.widget.AppBarLayout android:id="@+id/app_bar"
        android:fitsSystemWindows="true" android:layout_height="@dimen/app_bar_height"
        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">

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

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

    </android.support.design.widget.AppBarLayout>
    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </FrameLayout>

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

Bartek Lipinski · Accepted Answer · 2021-01-13T20:28:52.443

105

Explanation

Behavior is a parameter of the CoordinatorLayout.LayoutParams. You can set the behavior on an instance of CoordinatorLayout.LayoutParams with setBehavior method.

To get a proper Behavior object that represents the same thing as @string/appbar_scrolling_view_behavior you should create an instance of AppBarLayout.ScrollingViewBehavior.

Example

(this is a cleaned up version of my previous edits to the original answer)

First you will have to get an instance of a child View of your CoordinatorLayout. Let me get this clear: it is NOT the CoordinatorLayout itself. childView is CoordinatorLayout's child.

//e.g. like this:
val childView: View = findViewById(R.id.child_view)

Assuming the childView is already attached to the CoordinatorLayout (so it already has LayoutParams), you can do:

val params: CoordinatorLayout.LayoutParams = yourView.layoutParams as CoordinatorLayout.LayoutParams
params.behavior = AppBarLayout.ScrollingViewBehavior()
yourView.requestLayout()

edited Jan 13 '21 at 20:28

answered Nov 14 '15 at 10:35

Bartek Lipinski

30,698
10
94
132

1

Do you have an example where this is done programmatically? – AndroidP Nov 14 '15 at 10:44
1

`setBehavior` is causing an xml parse error when loading my fragment .. it is not working. In the case of fragments with their own class and xml, how do we do it? I notice in the docs there is an undocumented `public AppBarLayout.ScrollingViewBehavior (Context context, AttributeSet attrs)` – roberto tomás Apr 07 '16 at 20:06
That same behavior can be applied to LinearLayouts but I haven't been able to add it programmatically to yet. Do you happen to know how? I asked a question about it here: http://stackoverflow.com/questions/38530196/how-to-add-and-remove-layout-behavior-programmatically-to-linearlayout – Aspiring Dev Jul 22 '16 at 16:06
@BartekLipinski Can `yourView` be a `ListView` instead of `RecyclerView`? – Mark13426 Oct 17 '16 at 06:47
@Mark13426 I didn't say anything about `RecyclerView` but I assume you're asking if `ListView` can also work with `CollapsingToolbarLayout`. The answer is no. `CollapsingToolbarLayout` expects you to use a `View` that is implementing `NestedScrollingChild` interface. You could implement it yourself (for the `ListView`) but it seems like a pain in the butt in comparison to reimplementing your screen with `RecyclerView` instead. – Bartek Lipinski Oct 17 '16 at 07:23
what if I use GridView inside some other ViewGroup? I mean the scrolling view is not directly the child of CoordinatorLayout, and they are all created programatically. Is there any way to set the layout behaviou? to which? – tainy Dec 19 '16 at 02:35
@tainy You can only set `behavior` for direct children of `CoordinatorLayout`. – Bartek Lipinski Dec 19 '16 at 06:07
@BartekLipinski that is too bad. Is there any way that I can use AppBarLayout in my situation? In fact what I need is just move the title bar out of screen – tainy Dec 19 '16 at 09:30
@tainy it's not like some nasty feature of `CoordinatorLayout`. That's how whole Android SDK works. You can only set layout-specific parameters for direct children of a particular layout. I'd suggest you rethink your layout. – Bartek Lipinski Dec 19 '16 at 09:35
@BartekLipinski yes I agree that. The problem is the current layout. The existing layout is working for long time and is not intent to be changed in near period – tainy Dec 19 '16 at 09:52
I want to set the behavior for a view that I'm adding to the Coordinator Layout dynamically. So I'm calling mCoordinatorLayout.addView(customView) and I want to set the behavior of the custom view. However, the custom view doesn't seem to think that its layout params are CoordinatorLayout.Params – fobbymaster Apr 12 '17 at 22:27
@fobbymaster paste that as a question, not as a comment to this answer – Bartek Lipinski Apr 13 '17 at 07:12

score 9 · Answer 2 · answered Feb 08 '19 at 12:06

To enable and disable layout_behavior programatically with kotlin use this code :

fun enableLayoutBehaviour() {
    val param: CoordinatorLayout.LayoutParams = swipeRefreshView.layoutParams as CoordinatorLayout.LayoutParams
    param.behavior = AppBarLayout.ScrollingViewBehavior()
}

fun disableLayoutBehaviour() {
    val param: CoordinatorLayout.LayoutParams = swipeRefreshView.layoutParams as CoordinatorLayout.LayoutParams
    param.behavior = null
}

Note: replace swipeRefreshView with your view

As soon as we disable layout behaviour, will the hidden bottom navigation view appear back automatically ? — K Pradeep Kumar Reddy, Apr 26 '21 at 18:26

score 5 · Answer 3 · edited Apr 02 '18 at 16:55

5

Accepted answer is correct but the provided code is not compilable. So here is a complete example

CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) 
view.getLayoutParams();

params.setBehavior(new AppBarLayout.ScrollingViewBehavior(view.getContext(), null));

2nd param is AttributeSet and it is fine to have it as null although it is not marked as Nullable in support lib.

edited Apr 02 '18 at 16:55

Ruan_Lopes

1,381
13
18

answered Nov 29 '17 at 17:01

tasomaniac

10,234
6
52
84

2

why the code from my answer is not compilable? It seems to be compiling just fine for me? – Bartek Lipinski Jun 06 '18 at 12:29

Setting app:layout_behavior programmatically

3 Answers3

Explanation

Example

Linked