How to bind onClick event from view using Android Binding Library and Kotlin?

Question

I'm struggling to make Android Binding Library to work with Kotlin. What I want to achieve is dispatch a onClick event to my Presenter class. What I've done was:

1. Enable databinding on module's gradle file: dataBinding {enabled = true}
2. Import databinding compiler: kapt 'com.android.databinding:compiler:2.0.0-beta6'
3. Generate stubs: kapt {generateStubs = true}

4. Implement method on MainPresenter.kt:

   fun onClickEditProfile () {
       log("method you hoped to get called was called")
       mView!!.getContext().snackbar("received event: onClickEditProfile via data binding, this is awesome").show()
   }
   

5. Prepare layout:

   <layout xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto">
       <data>
           <variable
               name="presenter"
               type="br.com.tyllt.presenter.MainPresenter" />
       </data>
           <com.github.clans.fab.FloatingActionButton
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:onClick="@{() -> presenter.onClickEditProfile()}"
               android:src="@drawable/ic_edit"
               app:fab_colorNormal="@color/colorPrimary"
               app:fab_colorPressed="@color/colorPrimaryDark"
               app:fab_hideAnimation="@anim/fab_scale_down"
               app:fab_label="Edit Profile"
               app:fab_size="mini" />
   </layout>
   

Problem is, when I generate the apk I get the followin exception:

Error:Execution failed for task ':app:compileDebugJavaWithJavac'.

java.lang.IllegalArgumentException: Parameter specified as non-null is null: method org.jetbrains.kotlin.annotation.RoundEnvironmentWrapper.getElementsAnnotatedWith, parameter a

Any idea?

Answer 1

Well, after following this answer and taking care to use:

private fun initDataBinding() {
        val binding: ActivityLoginBinding = DataBindingUtil.setContentView(this, R.layout.activity_login)
        binding.presenter = mPresenter
    }

I was able to make it work. The problem was, I was initing the binding only using:

MainActivityBinding binding = MainActivityBinding.inflate(getLayoutInflater());

As pointed on Data Binding Library official page, which by some reason didnt work for me.