e: [kapt] An exception occurred: android.databindi

I have enabled databinding, but while I execute the code I get this error.

error

e: [kapt] An exception occurred: android.databinding.tool.util.LoggedErrorException: Found data binding errors.

I created a fragment class and XML for that class. Im able to import datbindingutil class.

I have done rebuilt/ sync with gradle files/ invalidate cache and restart, nothing worked.

xml

<layout>

<!--suppress AndroidUnknownAttribute -->
<data class=".databinding.ProfileFragmentBinding">

    <variable
        name="user"
        type="com.sample.sample.user.User" />

    <variable
        name="vm"
        type="com.sample.sample.user.UserViewModel" />

    <variable
        name="handler"
        type="com.sample.sample.user.profile.ProfileFragment" />
</data>


<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="match_parent">

    <de.hdodenhof.circleimageview.CircleImageView
        android:id="@+id/profileIV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/medium"
        android:layout_marginTop="@dimen/medium"
        android:contentDescription="@null"
        android:src="@mipmap/ic_launcher_round"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:url="@{user.avatarUrl}" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="@+id/profileIV"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@+id/profileIV">

        <TextView
            android:id="@+id/profileNameLabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:fontFamily="@font/myriad_pro_semibold"
            android:text="@{user.name}"
            android:textColor="@color/black_transparent_de"
            android:textSize="@dimen/text_regular"
            tools:text="NAME" />

        <TextView
            android:id="@+id/badgeLabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:fontFamily="@font/myriad_pro_semibold"
            android:text="@{user.badge}"
            android:textColor="@color/grey_000000"
            android:textSize="@dimen/text_regular"
            tools:text="Superman" />

        <TextView
            android:id="@+id/profile_Label"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:fontFamily="@font/roboto_bold"
            android:text="@{user.badge}"
            android:textColor="@color/green_39b54a"
            android:textSize="@dimen/text_small"
            tools:text="farmer_v1" />

    </LinearLayout>

    <ImageView
        android:id="@+id/badgeIV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/medium"
        android:layout_marginTop="@dimen/medium"
        android:contentDescription="@null"
        android:src="@mipmap/ic_launcher"
        app:error="@{@drawable/ic_profile_default_grey_24dp}"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:placeholder="@{@drawable/ic_profile_default_grey_24dp}"
        app:url="@{user.badgeUrl}" />

    <ImageView
        android:id="@+id/locationPinIV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/medium"
        android:contentDescription="@null"
        android:src="@drawable/ic_location_pin"
        app:layout_constraintStart_toStartOf="@+id/profileIV"
        app:layout_constraintTop_toBottomOf="@+id/profileIV" />

    <TextView
        android:id="@+id/profileAddressTV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/narrow"
        android:fontFamily="@font/roboto"
        android:textColor="@color/grey_000000"
        app:layout_constraintBottom_toBottomOf="@+id/locationPinIV"
        app:layout_constraintLeft_toRightOf="@+id/locationPinIV"
        app:layout_constraintTop_toTopOf="@+id/locationPinIV"
        tools:text="bangalore, Karnataka" />

    <ImageView
        android:id="@+id/dobIV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/standard"
        android:layout_marginTop="@dimen/medium"
        android:contentDescription="@null"
        android:src="@drawable/ic_dob"
        app:layout_constraintLeft_toRightOf="@+id/profileAddressTV"
        app:layout_constraintTop_toBottomOf="@+id/profileIV" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/narrow"
        android:fontFamily="@font/roboto"
        android:textColor="@color/grey_000000"
        app:layout_constraintBottom_toBottomOf="@+id/locationPinIV"
        app:layout_constraintLeft_toRightOf="@+id/dobIV"
        app:layout_constraintTop_toTopOf="@+id/locationPinIV"
        tools:text="born on 01/01/2000" />

    <TextView
        android:id="@+id/activityLabel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/big"
        android:fontFamily="@font/myriad_pro_semibold"
        android:text="@string/activities"
        android:textColor="@color/black_transparent_de"
        android:textSize="@dimen/text_regular"
        app:layout_constraintStart_toStartOf="@+id/profileIV"
        app:layout_constraintTop_toBottomOf="@+id/locationPinIV" />

    <View
        android:id="@+id/dividerV"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_marginEnd="@dimen/small"
        android:layout_marginStart="@dimen/small"
        android:layout_marginTop="@dimen/regular"
        android:background="@color/grey_000000"
        app:layout_constraintTop_toBottomOf="@+id/activityLabel" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintTop_toBottomOf="@+id/dividerV">

        <!--<com.google.android.material.tabs.TabLayout
            android:id="@+id/tablayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:pager="@{(pager)}"
            app:tabGravity="fill"
            app:tabIndicatorColor="@color/black"
            app:tabMode="fixed"
            app:tabSelectedTextColor="@color/black"
            app:tabTextAppearance="@style/CustomTextTab"
            app:tabTextColor="#b4ffffff" />

        <androidx.viewpager.widget.ViewPager
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/tablayout"
            app:handler="@{handler}"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />-->

    </RelativeLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

class

    class ProfileFragment : Fragment() {
    @Inject
    lateinit var mFactory: ViewModelProvider.Factory
    private lateinit var mBinding: ProfileFragmentBinding

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        mBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_profile, container, false);
        return mBinding.root
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        val vm: UserViewModel = getViewModel(mFactory)
        mBinding.vm = vm
        //mBinding.handler = this
        //mBinding.setLifecycleOwner(this)
    }

    /*@BindingAdapter("bind:handler")
    fun bindViewPagerAdapter(view: ViewPager, activity: MainActivity) {
        val adapter = ProfilePagerAdapter(view.context, activity.supportFragmentManager)
        view.adapter = adapter
    }

    @BindingAdapter("bind:pager")
    fun bindViewPagerTabs(view: TabLayout, pagerView: ViewPager) {
        view.setupWithViewPager(pagerView, true)
    }*/
}

回答1:

in my case I was able to find it when the mouse was hovering that line in the build output, as shown here:

without hover:

with hover:

it's really a shame how they show the error, for the simplest error ever, I was trying 10 different solutions as well invalidating the cache and ...

UPDATE:

you can also click here :

and you'll get something like this:

which is very detailed information about the error, I was missing this button in 7 years of Android Development :D

回答2:

Run ./gradlew build --stacktrace to check the details, which will tell you where the issue happens, something like:

e: [kapt] An exception occurred: android.databinding.tool.util.LoggedErrorException: Found data binding errors. Could not find accessor xx file:xxx/app/src/main/res/layout/fragment_xxxx.xml Line:108

Sometimes if you changed the property name, especially when changed by refactor => rename, the property name won't be changed in xml automatically.

回答3:

Mostly this error occurs when the name of the variable passed in the XML file through data binding is incorrect. Just hover over the mouse on the error and you would be able to identify the culprit variable there.