android: data binding error: cannot find symbol class

Question

I am getting started for using DataBinding feature. I am facing problem with it.

Error:(21, 9) error: cannot find symbol class ContactL

Answer 1

Make sure the name for your model and the reference have the same name:

For example, name="item" must match android:checked="@={item.checked}"

<data>
    <variable
        name="item"
        type="com.simone.mywordlist.model.MyModel" />
</data>

            <Switch
                android:id="@+id/my_switch"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:checked="@={item.checked}"
            />

Answer 2

Keypoint

Your layout name is in snake_case.

activity_login.xml

Then your binding class name will be in CamelCase.

ActivityLoginBinding.java

Also build project after creating layout. Sometimes it is not generated automatically.