Home » Android » android – Databinding error: Only one layout element and one data element are allowed.

android – Databinding error: Only one layout element and one data element are allowed.

Posted by: admin April 23, 2020 Leave a comment

Questions:

I’m getting following error when using databinding and include tag inside:

Error:Execution failed for task ':app:dataBindingProcessLayoutsBetaDebug'.>data binding error msg:Only one layout element and one data element are allowed. [path to file] has 3file:[path to file]****\ data binding error ****

This is my layout file:

[...]

        <LinearLayout
            android:id="@+id/activity_description_content"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:orientation="vertical">

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

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

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

            <include
                android:id="@+id/activity_description_bottom_buttons"
                layout="@layout/activity_description_bottom_buttons" />
        </LinearLayout>
[...]
</layout>

And in each of the included layouts i have something like this:

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

From this reply: Android Data Binding using include tag i suppose that my code is correct, why databinder thinks that I use more than single tag in the file?

How to&Answers:

I solved my issue. This error appears when there is more than single element in the layout tag:

Wrong:

<layout>
     <data>
          ...
     </data>
     <LinearLayout>
          ...
     </LinearLayout>
     <LinearLayout>
          ...
     </LinearLayout>
</layout>

Correct:

<layout>
     <data>
          ...
     </data>
     <LinearLayout>
         <LinearLayout>
              ...
         </LinearLayout>
         <LinearLayout>
              ...
         </LinearLayout>
     </LinearLayout>
</layout>

Answer:

In < layout>, must have one < data> and one layoutView(Relative/Linear etc)….
Multiple layoutViews are not allowed,In layoutViews may have multiple layoutViews but on top layer multiplicity are not allowed….

Answer:

layout tag doesn’t allow more than one child, Please put your all xml code inside any parent layout like relative/ linear layout

Example

<layout>

 <LinearLayout> 
................
............... 
</LinearLayout> 
</layout>

Answer:

Also this error hapens when you are using DataBinding and using tag without tag

correct

<layout>
 <data>
      <variable>
      </variable>
 </data>
 <LinearLayout>
      ...
 </LinearLayout>
 <LinearLayout>
      ...
 </LinearLayout>

in other words you have to keap DataBinding structure in xml