RuntimeException: Could not inflate Behavior subclass

Question

I new in android and I've troubles with FloatingActionButton behaivors

My custom behavoir class:

public class ScrollingFABBehavior extends FloatingActionButton.Behavior {
    private static final String TAG = "ScrollingFABBehavior";

    public ScrollingFABBehavior(Context context, AttributeSet attrs,
            Handler mHandler) {
        super();
    }

    @Override
    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout,
            FloatingActionButton child, View directTargetChild, View target,
            int nestedScrollAxes) {
        return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL
                || super.onStartNestedScroll(coordinatorLayout, child,
                        directTargetChild, target, nestedScrollAxes);
    }

    @Override
    public void onNestedScroll(CoordinatorLayout coordinatorLayout,
            FloatingActionButton child, View target, int dxConsumed,
            int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
        super.onNestedScroll(coordinatorLayout, child, target, dxConsumed,
                dyConsumed, dxUnconsumed, dyUnconsumed);
        if (dyConsumed > 0 && child.getVisibility() == View.VISIBLE) {
            child.hide();
        } else if (dyConsumed < 0 && child.getVisibility() == View.GONE) {
            child.show();
        }
    }

    @Override
    public void onStopNestedScroll(CoordinatorLayout coordinatorLayout,
            FloatingActionButton
            child, View target) {
        super.onStopNestedScroll(coordinatorLayout, child, target);
    }
}

Fragment XML:

...

<android.support.design.widget.FloatingActionButton
        android:id="@+id/share_fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:contentDescription="@string/action_share"
        android:elevation="@dimen/fab_elevation"
        android:src="@drawable/ic_share"
        app:layout_behavior=".ScrollingFABBehavior"/>

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

RuntimeError when fragment inflate xml:

07-14 08:52:43.904 30785-30785/com.example.xyzreader E/AndroidRuntime: FATAL EXCEPTION: main
                                                                       Process: com.example.xyzreader, PID: 30785
                                                                       android.view.InflateException: Binary XML file line #115: Could not inflate Behavior subclass com.example.xyzreader.ui.ScrollingFABBehavior
                                                                       Caused by: java.lang.RuntimeException: Could not inflate Behavior subclass com.example.xyzreader.ui.ScrollingFABBehavior
                                                                           at android.support.design.widget.CoordinatorLayout.parseBehavior(CoordinatorLayout.java:615)
                                                                           at android.support.design.widget.CoordinatorLayout$LayoutParams.<init>(CoordinatorLayout.java:2652)

e.t.c

Whats wrong?

Change to: public ScrollingFABBehavior() { super(); } . Nothing change — Aleksey Leonov, Jul 14 '17 at 11:06

score 40 · Answer 1 · edited Nov 07 '18 at 16:48

40

Add the following two constructors to your FooterBehavior:

public FooterBehavior() {
}

public FooterBehavior(Context context, AttributeSet attrs) {
    super(context, attrs);
}

edited Nov 07 '18 at 16:48

Onik

15,592
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answered Sep 04 '17 at 03:15

PangoSea

539
3
10

doesn't help in my case – Leo Droidcoder Jun 07 '19 at 11:19
3

Kotlin Version: ```class ScrollingFABBehavior(context: Context?, attrs: AttributeSet?) : FloatingActionButton.Behavior(context, attrs) { constructor() : this(null, null) } ``` – Alqueraf Mar 10 '20 at 11:22
There is a simplified Kotlin version possible: `class ScrollingFABBehavior @JvmOverloads constructor(context: Context? = null, attrs: AttributeSet? = null) {...}` – S-Sh Mar 12 '21 at 17:48

score 17 · Answer 2 · edited Jan 30 '20 at 11:04

17

Make sure that you are using the correct path of the custom behavior class.

For example:

app:layout_behavior="net.company.myapp.view.behavior.TextViewBehavior"

edited Jan 30 '20 at 11:04

Vadim Kotov

7,103
8
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answered May 02 '19 at 13:08

Mahmoud

1,672
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3

In my case Android Studio changed my absolute path to a relative path. My package name differs from the id so it was breaking it. – P Fuster Oct 15 '19 at 13:39
6

Try to use the **absolute path** for the Behavior Subclass instead of **Relative Path** as at runtime Android might not be able to resolute the relative path – Abhishek Nov 28 '19 at 11:05

score 13 · Answer 3 · edited Sep 09 '19 at 09:38

13

If you are using AndroidX (open-source project that the Android team uses to develop, test, package, version and release libraries within Jetpack) then you need to update XML.

Find your element here and replace:

Support:

android.support.design.widget.FloatingActionButton

AndroidX:

com.google.android.material.floatingactionbutton.FloatingActionButton

edited Sep 09 '19 at 09:38

Paul Spiesberger

4,334
1
37
47

answered Apr 01 '19 at 10:09

Md Imran Choudhury

6,954
2
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score 9 · Answer 4 · answered Nov 06 '19 at 11:56

In case your app has a different package ID than your actual package structure, make sure you specify the full path to your custom behavior class:

<android.support.design.widget.FloatingActionButton
        ...
        app:layout_behavior="com.example.xyzreader.ScrollingFABBehavior"/>

score 8 · Answer 5 · edited Sep 08 '20 at 18:47

8

If you are using BottomSheet in Android X you must use

app:layout_behavior="@string/bottom_sheet_behavior"

if not then use

app:layout_behavior="android.support.design.widget.BottomSheetBehavior"

edited Sep 08 '20 at 18:47

trickymind

257
2
12

answered Jun 27 '20 at 08:30

Ram Chhabra

235
3
8

score 4 · Answer 6 · edited Feb 06 '18 at 19:36

4

Solved. Change app:layout_behavior=".ScrollingFABBehavior"/> to app:layout_behavior=".ui.ScrollingFABBehavior"/>

edited Feb 06 '18 at 19:36

GuilhE

10,723
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answered Jul 14 '17 at 13:33

Aleksey Leonov

341
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6

How is this going to help anyone? who knows your package signature and what mistake you've made is unclear. – Ishaan May 15 '19 at 11:08
1

Actually he's right, for me putting the all package name worked instead of just the class name. – Benjamin Ledet Jan 13 '20 at 10:16

score 4 · Answer 7 · answered Aug 23 '20 at 11:51

I had a similar problem and ended up on this page.

I am working with Bottom Sheet on Android X

I ran my app and got the following error message when I tapped to move to a new Fragment in the app and the app crashed with a RuntimeExeception: "Could not inflate Behavior subclass com.google.android.material.bottomsheet.BottomSheetBehaviour"

My layout attributes were as follows:

<androidx.constraintlayout.widget.ConstraintLayout 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="wrap_content"
    android:background="@drawable/player_bg"
    app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehaviour"
    app:behavior_hideable="true"
    app:behavior_peekHeight="70dp">

When I got that error message I changed one line and then the app worked.

As described above, as I am using Android X, i changed from:

app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehaviour"

I changed this line to:

app:layout_behavior="@string/bottom_sheet_behavior"

This one change meant that the code worked for me, no crash and the new Fragment showed up as expected.

score 3 · Answer 8 · answered Jun 30 '20 at 11:00

If you are working with androidX then your root layout should be:

<androidx.coordinatorlayout.widget.CoordinatorLayout

and bottom_sheet's layout should include:

app:layout_behavior="@string/bottom_sheet_behavior"

else if you are not using androidx or using support library then your root layout should be:

<android.support.design.widget.CoordinatorLayout

and bottom_sheet's layout should include:

app:layout_behavior="android.support.design.widget.BottomSheetBehavior"

RuntimeException: Could not inflate Behavior subclass

8 Answers8

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