数据绑定Kotlin Android studio错误

Question

我正在尝试在我的项目中使用数据绑定库,这是用Kotlin编写的.我正在使用Kotlin v.1.0.2和Gradle插件v.2.12以及绑定编译器.我的build.gradle配置如下:

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"
}

在我的Fragment布局中,我<data>使用一些变量声明了块:

<?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>

然后在我的AuthorizationFragment.kt课上我设置这些变量:

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
}

问题是虽然这段代码成功编译并构建了APK,Android studio标记了这些行

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

无效并显示以下错误:Cannot access class 'com.xxx.ui.authorization.AuthorizationPresenter'. Check your module classpath for missing or conflicting dependencies.我试图添加kapt 'com.google.guava:guava:19.0'到我的build.gradle,但没有任何改变.另外值得一提的是,只有当我在Kotlin中编写片段时才出现问题,当它用Java编写时,一切正常.

Answer 1

在 IDE 显示错误之前，您可以使用以下命令：

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

它不像 kotlin 形式那么简洁，但红色不会再让你发疯了;)