java.lang.NullPointerException: Missing required view with ID:

Question

Android Studio 3.6

in app/build.gradle:

android {
viewBinding.enabled = true

Here my xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/bluetoothBottonMainContainer"
        android:layout_width="0dp"
        android:layout_height="104dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <View
            android:id="@+id/viewPointNotSelect"
            android:layout_width="16dp"
            android:layout_height="16dp"
            android:background="@drawable/circle_transparent"
            app:layout_constraintBottom_toBottomOf="@+id/separator"
            app:layout_constraintEnd_toStartOf="@+id/separator"
app:layout_constraintTop_toTopOf="parent" />

and another xml the unclude prev. xml:

 <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/bottonContainer"
        android:layout_width="0dp"
        android:layout_height="104dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent">

        <include
            android:id="@+id/qrBottonContainer"
            layout="@layout/qr_bottom_container"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />

here my activity:

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = QrBluetoothSwipeActivityBinding.inflate(layoutInflater)
        setContentView(binding.root)
}

the app is build and run. Nice.

Now I move id - android:id="@+id/bluetoothBottonMainContainer"

to outer container like this:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/bluetoothBottonMainContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="0dp"
        android:layout_height="104dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <View
            android:id="@+id/viewPointNotSelect"
            android:layout_width="16dp"
            android:layout_height="16dp"
            android:background="@drawable/circle_transparent"
            app:layout_constraintBottom_toBottomOf="@+id/separator"
            app:layout_constraintEnd_toStartOf="@+id/separator"
            app:layout_constraintTop_toTopOf="parent" />

app is build, but when run I get runtime error in this line:

binding = QrBluetoothSwipeActivityBinding.inflate(layoutInflater)

error:

10-25 11:11:51.290 E/AndroidRuntime(14128): FATAL EXCEPTION: main
10-25 11:11:51.290 E/AndroidRuntime(14128): Process: com.myproject.debug, PID: 14128
10-25 11:11:51.290 E/AndroidRuntime(14128): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myproject.debug/com.myproject.ui.actviity.QRBluetoothSwipeActivity}: java.lang.NullPointerException: Missing required view with ID: bluetoothBottonMainContainer
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.app.ActivityThread.-wrap11(ActivityThread.java)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.os.Handler.dispatchMessage(Handler.java:102)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.os.Looper.loop(Looper.java:148)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.app.ActivityThread.main(ActivityThread.java:5417)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at java.lang.reflect.Method.invoke(Native Method)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
10-25 11:11:51.290 E/AndroidRuntime(14128): Caused by: java.lang.NullPointerException: Missing required view with ID: bluetoothBottonMainContainer
10-25 11:11:51.290 E/AndroidRuntime(14128):     at com.myproject.databinding.BluetoothBottomContainerBinding.bind(BluetoothBottomContainerBinding.java:114)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at com.myproject.databinding.QrBluetoothSwipeActivityBinding.bind(QrBluetoothSwipeActivityBinding.java:76)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at com.myproject.databinding.QrBluetoothSwipeActivityBinding.inflate(QrBluetoothSwipeActivityBinding.java:62)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at com.myproject.databinding.QrBluetoothSwipeActivityBinding.inflate(QrBluetoothSwipeActivityBinding.java:52)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at com.myproject.ui.actviity.QRBluetoothSwipeActivity.onCreate(QRBluetoothSwipeActivity.kt:31)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.app.Activity.performCreate(Activity.java:6251)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
10-25 11:11:51.290 E/AndroidRuntime(14128):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
10-25 11:11:51.290 E/AndroidRuntime(14128):     ... 9 more
10-25 11:11:51.291 W/ActivityManager(  780):   Force finishing activity com.myproject.debug/com.myproject.ui.actviity.QRBluetoothSwipeActivity
10-25 11:11:51.307 I/Icing   (11529): Indexing done com.google.android.gms-apps

Solution 1

I encountered this issue but in my case the issue is the include flag. The workaround I found is to make the view id to be the same as the id of the root view of the included layout.

activity_layout.xml

<LinearLayout>
    <include android:id="@+id/widget1" layout="@layout/my_widget" />
</LinearLayout>

my_widget.xml

<LinearLayout
    android:id="@+id/widget1">
</LinearLayout>

Solution 2

If someone is getting this with TabLayout and ViewBinding enabled then you might have set id for the TabItem. Removing id from TabItem rseolved the issue for me.

Solution 3

Please check, maybe you have the same layout files in different modules.

Solution 4

Watch out, if you use <merge> inside your included layout XML, the logic is different, as pointed out here:
Exploring Android View Binding in Depth

If we try to give this an ID, the view binding won’t generate the ID in the binding class so we can’t access the view as we did in the case of the normal include.
In this case, we have PlaceholderBinding which is an auto-generated class for placeholder.xml (our <merge> layout file). We have to call its bind() method and pass the root view of the layout in which we included it.

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

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

</androidx.constraintlayout.widget.ConstraintLayout>

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
        binding = FragmentOrderBinding.inflate(layoutInflater, container, false)
        placeholderBinding = PlaceholderBinding.bind(binding.root)
        placeholderBinding.tvPlaceholder.text = getString(R.string.please_wait)
        return binding.root
    }

Solution 5

Update

This should be fixed in latest Beta, Carnary versions of Android Studio

Still there is an issue when using View Binding with material tab layout tab items which is reported here and have not fixed yet.

---

This is bug in ViewBinding which is reported in the issue tracker in following places.

• https://issuetracker.google.com/issues/143729912
• https://issuetracker.google.com/issues/143683987

View more solutions

Comments

[Paradoxy]

Status fixed? Of course not. I still have this issue.

[user158]

@Paradoxy it should works now, upgrade your Android studio to latest version, since viewbinding is coming from build tools in Android Studio

[Paradoxy]

I am using android studio 3.6 from 12/2/2020 and yet the problem didn't go away for some of my activities. I have a linearLayout, which has tabLayout, viewPager, etc as its childs. My tabLayout itself has 3 tab items. I get Missing required view with ID for tab items. When I remove their id, this error goes away. I am using simple ids such as @id/tabitem, etc. This activity also has a drawerlayout with navigation. By using viewbinding, its toggle disappears even though I call .setDisplayHomeAsUpEnabled(true).In the end I added tools:viewBindingIgnore="true" and used that good old findviewbyid.

[user158]

@Paradoxy I also faced this issue, it is already reported which is not fixed.

[mochadwi]

The error still occurred to me, when using <merge> layout for dynamically added view, e.g: parent_layout.xml -> addView for parent_layout.xml child using MyMergeLayoutBinding.inflate(inflater, viewGroup, false) -> my_merge_layout.xml is using <merge> as parent tag

[mochadwi]

the above 3 issue also occurred to me

[Erik]

Still an issue today with AS v3.6.1 and AGP v3.6.1.

[user158]

@Erik earlier mentioned issues are fixed for me in the canary.

[mochadwi]

would you mind giving us information which version of canary, that this problem is fixed? @user158

[user158]

@mochadwi I used AS 4.0 canary 9, should be also fixed on latest versions like 4.1 canary 1

[Udayaditya Barua]

I got this when I had an include which was referring to a layout with just Toolbar in the layout as the root.

[mkuech]

In my experience, this will also happen when you try to mix simple ViewBinding with DataBinding layouts (if only some of your layouts involved have the layout root).

[zgluis]

Done. This fails: Android Studio 3.6.2 - This works: Android Studio 4.1 Canary 5

[cking24343]

I agree, this is dumb. My solution was to keep id for include tag and remove id of top level of the constraintLayout in the layout reference for include tag.

[Jenish]

Can't believe setting same name will actually works for me.

[Joan]

Thanks! In my case i was also declaring a different binding for the included layout. Using the root layout is enough

[mochadwi]

this also works for me. turns out the id inside included layout not found if we configure id on both <include> tag or the parent layout used

[Jake Wharton]

This is not required as of AGP 4.0 or newer.

[paul_f]

Still happening for me in 4.0.1 (Main Rlease)

[Volodymyr R.tmnko]

Adding the id to the </include/> tag fixed the issue. AndroidStudio 4.0 - 4.1

[P1NG2WIN]

Thanks a lot! Problem was in same name of two layout in differen feature modules

[NizarETH]

you can't get child view without id

[Ehma Africa]

Best answer for my multiple module situation. Thanks man

[Narayan soni]

any other way to add id on tabitem with viewBinding enabled

[j2emanue]

great answer. life saver. in my case it was a custom view and i could not retrieve it as the include layout had a merge tag.

[Elyes Mansour]

Thanks ! This was my problem as well. It happened even though one of the modules wasn't even being used by the app.

[Sjd]

ok great! but why? is there an explanation?

[Yasser AKBBACH]

You saved my a$$ thank you

[S. Alawadi]

Even if there is no explanation, but thank you to the moon

[Chee-Yi]

The reason is explained in stackoverflow.com/a/66325932/5020627.

[manoellribeiro]

Thanks, it happened when I migrated a lib used by my project to view binding and it had a layout with same name on my project.

[Mahmoud Omara]

this answer should be the accepted answer for this issue

[Amr]

solution: Don't give id to your included layout.

[qkx]

thanks man! You saved me a lot of time, wasted an hour with this...Sadly it is exactly as I thought, it is just ANOTHER maddening undocumented bug in Android API.