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

Answer 1

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

Update: For those people wondering how they can switch tabs without having an id and a ViewPager2, here is the documentation that recommends using TabLayoutMediator:

Create swipe views with tabs using ViewPager2

Answer 2

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

Answer 3

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
    }

Answer 4

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>

Answer 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

Answer 6

You can also get this error if you incorrectly bind a cell to a view in a recyclerView. If you bind a view to the wrong layout, then you will get an error stating that it cannot find the expect child views.

This had me stumped for a long time.

The solution is to ensure the layout you are binding to the view is the same layout as the ViewBinding.

For example, makesure:

R.layout.my_new_view

is bound to:

MyNewViewBinding

Or you will get this error.

Answer 7

You should delete the TabItem id and use the TabLayout API to get the item, this workaround works if you are using Material Design

check this: Github answer

Answer 8

In my case, there was another file with the same name in another module.

I had item_view.xml in module A and item_view.xml in module B, so databinding couldn’t distinguish between them.

I changed the name of one of them and it fixed.

Answer 9

The solution is remove the id of the main container. And put in other container inside the parent.

1.- Layout

    <include
    android:id="@+id/example"
    layout="@layout/account_current_payment_card"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>
    

2.- Include Layout

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

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/example2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent">
    </androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 10

This is happening to me right now. I just noticed that this happened because in my xml files lets call them: Activity_main.xml / Activity_other.xml I used to have a widget (a button in this case) with the same id, (+id/bttNext)

(that means activity_main.xml and Activity_other used to have a button with the same +id)

as soon I test my app on a device the:

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

appeared

as soon I changed the second activity´s button´s +id (let's say renamed bttNext1) the app worked fine

To summarize: avoid using the same id in buttons (et al widgets) does not matter if they´re in separate activities

Answer 11

In my case , I removed the id inside the included layout and it works properly !

main.xml

    <RelativeLayout>   
    ....
    <include
        include="@layout/included_layout"   
        android:id="@+id/view_included_layout"/>
    </RelativeLayout>

included_layout.xml

`   <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/top_level_layout">  <!-- Remove this id -->    
        ....
    </LinearLayout>
`

My Android Studio version is 3.6.2 and version of build.gradle is 3.6.1

Answer 12

Cleaning and Rebuilding project helped me

Answer 13

I tried many ways, but all didn't work.

Finally, the problem is there is an XML with the same name in another module

Answer 14

I meet the same bug.You can add a wrapper view in your "outer container" to avoid this bug.

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

Answer 15

For me, the issue was that I was still using Android 3.x version, but was using the new Gradle 4.0.0 version.

Pressed "About->Check for Updates", updated Android Studio, and the error is no more.

Answer 16

just remove .gradle directory and invlidate caches/restart the project, keep backup of project. I was facing the same issue, solved using this method.

Answer 17

This is error can also happen if you by mistake use an xml layout for the fragment but use a different one for the binding.I was doing when I encountered the error

class LoginFragment :Fragment(R.layout.login_fragment) { 
private val binding by viewBinding(LoginFragmentNewBinding::bind)//here I am referring to a new xml file called login_fragment_new which is different from the one in the Fragment's constructor (i.e login_fragment)
}

and using the same xml file fixed it for me.

Answer 18

Got this issue with custom view , where is wrongly took this instead of super

constructor(context: Context, attrs: AttributeSet?) : this(context,attrs) { //<-Change this to super

}

Answer 19

I was getting error because in my case main app and module has same layout (layout_calling_waiting) with different views which was not able to find in app's layout. So the error waas giving.

Answer 20

i faced same problem and i solved it by remove this line in the layout.

tools:context=".ui.SplashScreenActivity

Answer 21

In my case this problem was related with same naming of xml files in different modules.

Why got problem:

I had 2 xml files with the same name (item_tag.xml) in different modules (app, landing). Compiler doesn't know which one need to use, and I got an error during runtime (every time when I opened a screen with this binding).

Solution:

I renamed xml file, and one become item_landing_tag.xml (and got generated ItemLandingTagBinding class instead of ItemTagBinding).

Hope it helps someone :)

Answer 22

I had the same problem when I tried to create ViewBinding from the existing view using bind() function with invalid layout id.

So, keep in mind that MyLayoutBinding.bind(view) should get view inflated from R.layout.my_layout (not R.layout.my_another_layout and so on)

/** DON'T: call bind() with view inflated from another layout id */
val view = LayoutInflater.from(context).inflate(R.layout.my_invalid_layout) // <- be careful here
val binding = MyCorrectLayoutBinding.bind(view)
// crash

/** DO: call bind() with view inflated from the same layout id */
val view = LayoutInflater.from(context).inflate(R.layout.my_correct_layout)
val binding = MyCorrectLayoutBinding.bind(view)
// ok

Answer 23

getRootView() returns the included layout and can make changes in it

Answer 24

It may be late but. For everyone who come across this issue. I first tried out everything I saw here with no luck. I found out that using snake case ids fixes the problem. I had an id as tabContainer annd it was causing the NPE. Renaming it to tab_container fixed the bug for me.

Answer 25

Same problem but just in custom view activity I put the correct attributes.

In kotlin:

class CanvasNew @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null):View(context,attrs){

Answer 26

For my base my_main_layout.xml was -

<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

  <ScrollView style="@style/ScrollViewContainerStyle">

    <include
        android:id="@+id/include_1"
        layout="@layout/layout"></include>
    
    <include
        android:id="@+id/include_1"
        layout="@layout/layout"></include>
    
    <include
        android:id="@+id/include_1"
        layout="@layout/layout"></include>
    </include></layout>

 </ScrollView>

And my included layout.xml was -

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
    android:id="@+id/tv_title"
    tools:text="This is a tile" />
</LinearLayout>

I just solved my problem by wrapping it with <layout> -

<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:visibility="visible">
<TextView
    android:id="@+id/tv_title"
    tools:text="This is a tile" />
</LinearLayout>
</layout>

Answer 27

In my case I was using incorrect FragmentBinding class in onCreateView method to inflate layout:

open class InfoFragment : BaseFragment() {

    private val binding by viewBinding(FragmentInfoBinding::bind)
    
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
        // NOTE: using incorrect binding class
        return FragmentEducationBinding.inflate(inflater, container, false).root
    }
    ...
}

To solve this issue I should have to use the correct binding class in onCreateView method, FragmentInfoBinding in my case:

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
    return FragmentInfoBinding.inflate(inflater, container, false).root
}

Answer 28

A solution could be:

init {
    id = context.obtainStyledAttributes(attrs, intArrayOf(android.R.attr.id)).let { typedArray ->
        val value = typedArray.getResourceId(0, View.NO_ID)
        typedArray.recycle()
        value
    }
    val inflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
    binding = AnyBinding.inflate(inflater, this)
}

Answer 29

Run your code with opposite { minifyEnabled }

If so now:

debug {
      minifyEnabled false
}

Then run so:

debug {
      minifyEnabled true
}

Or vice versa.

Answer 30

My solution was similar but slightly different, I had an include in my dialog

<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:minHeight="@dimen/complete_programme_min_height"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<include
    android:id="@+id/include" <!-- Removing this line worked -->
    layout="@layout/background_triangle_medium_violet_gradient" />