CODEWITHSUNDEEP
androiddata-bindingandroid-databindingandroid-binding-adapter
Sarah Maher
Sarah Maher

Reputation: 830

Data binding passing xml element with special characters

Consider the following bindingAdapter 

@BindingAdapter({"pager"})
public static void bindViewPagerTabs(final TabLayout view, final ViewPager pagerView)
{
    view.setupWithViewPager(pagerView, true);
}

and the setting in the xml is : 

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/card_control_tab_layout"
            style="@style/tab_in_toolbar_style"
            android:background="@color/colorPrimary"
            app:tabGravity="fill"
            app:pager="@{(pager_r)}"
            app:tabMode="scrollable" />

Gives the following error : 

error: cannot find symbol class ActivityCardControlBindingImpl

But if I changed the pager Id to anything without the underscore or any special characters like @+id/pager it works perfectly, any valid reason ?

Upvotes: 0

Views: 321

Answers (2)

Sarah Maher
Sarah Maher

Reputation: 830

I found the same answer as Janosch Pelzer's with a litte more explsnation here

Cannot refer to other View ID in Android data binding

Upvotes: 0

anon
anon

Reputation:

It works if you write app:pager="@{(pagerR)}" instead of app:pager="@{(pager_r)}". Also you don't need the brackets, so you could just write app:pager="@{pagerR}".

EDIT:

But if I changed the pager Id to anything without the underscore or any special characters like @+id/pager it works perfectly, any valid reason ?

I don't know about other special characters, but when you use the underscore in your view ids the snake case view ids like "pager_r" get converted by databinding to camel came variables like "pagerR". So as my original answer states, if you use @+id/pager_r you can use the variable pagerR.

Upvotes: 1

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