Data Binding Kotlin Android studio errors

Question

I am trying to use Data binding library in my project, that is written in Kotlin. I am using Kotlin v.1.0.2 & Gradle plugin v. 2.12 and with binding compiler. My build.gradle configured as follows:

android {
    dataBinding {
        enabled = true
    }
}
kapt {
    generateStubs = true
}
dependencies {
    kapt "com.google.dagger:dagger-compiler:2.2"
    provided "org.glassfish:javax.annotation:10.0-b28"
    kapt "com.android.databinding:compiler:2.12"
}

In my Fragment layout I declared <data> block with some variables:

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <import type="android.view.View"/>
        <import type="com.xxx.ui.AuthorizationPresenter"/>
        <import type="com.xxx.entity.AuthProvider"/>
        <variable
            name="model"
            type="com.xxx.ui.authorization.Model"/>
        <variable
            name="presenter"
            type="com.xxx.ui.authorization.AuthorizationPresenter"/>

    </data>
    <FrameLayout
  ... />
</layout>

And then in my AuthorizationFragment.kt class I am setting these variables:

override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    binding = FragmentAuthorizationBinding.inflate(inflater)
    binding?.presenter = presenter
    binding?.model = Model()
    binding?.addOnRebindCallback(object : OnRebindCallback<FragmentAuthorizationBinding>() {
        override fun onPreBind(binding: FragmentAuthorizationBinding?): Boolean {
            val sceneRoot = binding?.root as ViewGroup
            TransitionManager.beginDelayedTransition(sceneRoot)
            return true
        }
    })
    return binding?.root
}

And the problem is though this code successfully compiles and builds APK, Android studio marks these lines

binding?.presenter = presenter
binding?.model = Model()

as invalid and shows the following error: Cannot access class 'com.xxx.ui.authorization.AuthorizationPresenter'. Check your module classpath for missing or conflicting dependencies. I tried to add kapt 'com.google.guava:guava:19.0' to my build.gradle, but nothing has changed. Also worth to mention that problem is only appears when I write my fragment in Kotlin, when it is written in Java everything is ok.

Yeah, thanks. Very useful tracker for those using Kotlin. Seems like something related to Kotlin Lint, I think — Oleg Osipenko
– Oleg Osipenko, Commented Jun 16, 2016 at 10:01

Arkadiusz Cieśliński · Accepted Answer · 2017-03-02 17:40:36Z

1

Until the IDE shows the error, you can use this:

binding.setVariable(BR.model, Model())

It is not so concise as kotlin form but the red color will not drive you crazy any more ;)

answered Mar 2, 2017 at 17:40

Arkadiusz Cieśliński

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