'Unknown DataBinding Class

I am newbie to DataBinding in Android and learning it to my own. I have just enabled the DataBinding in my App Gradle File in the Android Tag as:

    dataBinding{
        enabled=true
    }

My XML is setup like this:

<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <RelativeLayout
        tools:showIn="@layout/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Hello World!"/>

    </RelativeLayout>
</layout>

And my Activity Looks like:

The problem is that the ActivityMainBinding Class is unknown to Android Studio. I don't know why is this happening. As I had clean, re-build make the project and everything doesn't help me out!

I am attaching an [screen shot][1] too, looking at the screenshot you can find that the ActivityMainBinding is highlighted in RED COLOR

javaandroidandroid-studioandroid-databinding


Solution 1:[1]

It was totally strange because Its ANDROID STUDIO!

What I done is just changed the name of the activity_main.xml to activity_main_.xml then I make the project!

After Making the project, I reverted back to the old name i.e activity_main.xml and it works like a charm. Don't know but it works really because this GooF Android Studio doesn't even ever makes any sense!

Solution 2:[2]

It will only be named ActivityMainBinding if your layout is named activity_main.xml.

Solution 3:[3]

It's because you are using <layout> attribute in content_main.xml. So your binding class name will be ContentMainBinding.

Also you need to set R.layout.content_main to DataBindingUtils class.

OR

Just add <layout> in activity_main.xml and remove from content_main.xml and keep rest of code as it is. Just rebuild the project.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Java Nerd
Solution 2 terencey
Solution 3

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