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:

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

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()
}

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?

Paste your build.gradle file

Dharmendra Pratap Singh
– Dharmendra Pratap Singh

2017-01-07 04:52:50 +00:00
Commented Jan 7, 2017 at 4:52 — Dharmendra Pratap Singh
– Dharmendra Pratap Singh, Commented Jan 7, 2017 at 4:52

Community · Accepted Answer · 2017-05-23 12:24:37Z

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.

edited May 23, 2017 at 12:24

CommunityBot

11 silver badge

answered Jan 8, 2017 at 23:42

E. Fernandes

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