Java Kotlin-android：未解析的参考数据绑定

Kotlin-android: unresolved reference databinding

提问by Mikhail

I have following fragment class written in Java using the new databinding library

我有以下使用新数据绑定库用 Java 编写的片段类

import com.example.app.databinding.FragmentDataBdinding;

public class DataFragment extends Fragment {

    @Nullable
    private FragmentDataBinding mBinding;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        mBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_data, container, false);
        return mBinding.getRoot();
    }
}

It compiles and runs fine.
I tried to rewrite it in Kotlin and came up with the following:

它编译并运行良好。
我尝试在 Kotlin 中重写它并想出了以下内容：

import com.example.app.databinding.FragmentDataBdinding

class ProfileFragment : Fragment() {

    private var mBinding: FragmentDataBinding? = null

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        mBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_data, container, false)
        return mBinding!!.getRoot()
    }
}

But now step :app:compileDebugKotlinoutputs the following:

但是现在 step:app:compileDebugKotlin输出以下内容：

Error:(16, 38) Unresolved reference: databinding
Error:(37, 27) Unresolved reference: FragmentDataBinding

错误：(16, 38) 未解析的引用：数据绑定
错误：(37, 27) 未解析的引用：FragmentDataBinding

How can I use android-databinding library with Kotlin?

如何在 Kotlin 中使用 android-databinding 库？

My top-level build.gradle:

我的顶级build.gradle：

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.0'
        classpath 'com.android.databinding:dataBinder:1.0-rc4'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

My build.gradlein app dir (only relevant parts):

我build.gradle的应用程序目录（仅相关部分）：

apply plugin: 'com.android.application'
apply plugin: 'com.android.databinding'
apply plugin: 'kotlin-android'

dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
}

buildscript {
    ext.kotlin_version = '0.14.451'
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
    }
}
repositories {
    mavenCentral()
    maven {
        url 'http://oss.sonatype.org/content/repositories/snapshots'
    }
}

I'm using Android Studio 1.4, Build tools version 23.0.1, Android SDK 23, SDK tools 24.4.0

我使用的是 Android Studio 1.4，构建工具版本 23.0.1，Android SDK 23，SDK 工具 24.4.0

回答by Jaydeep Solanki

Update 2: This is a really old answer, instead refer to lrampazzo's answer.

更新 2：这是一个非常古老的答案，而是参考 lrampazzo 的答案。

It works with 1.0-rc4, put

它适用于 1.0-rc4，把

kapt 'com.android.databinding:compiler:1.0-rc4' 

into your dependencies

进入你的依赖

Thanks Ghedeon, for the link in comments

感谢 Ghedeon，提供评论中的链接

Update: Here'sa really simple hello world example project

更新：这是一个非常简单的 hello world 示例项目

回答by Garf1eld

Try this.Andrid studio 2.0(2.1)

试试这个。Andrid studio 2.0(2.1)

In build.gradle

在build.gradle

android{
   dataBinding {
        enabled = true
    }
...
}
dependencies {
 kapt 'com.android.databinding:compiler:2.0.0-rc1'
....
}

kapt {
    generateStubs = true
}

In my project: buildToolsVersion = "23.0.3"

在我的项目中： buildToolsVersion = "23.0.3"

in top level build.gradle

在顶级 build.gradle

dependencies {
        classpath 'com.android.tools.build:gradle:2.0.0'
    }

回答by lrampazzo

Try use this configuration:

尝试使用此配置：

In main build.gradle:

在主build.gradle 中：

buildscript {
    ext.kotlin_version = '<kotlin-version>'
    ext.android_plugin_version = '2.2.0-alpha4'
    dependencies {
        classpath "com.android.tools.build:gradle:$android_plugin_version"
    //... rest of the content
    }
}

App build.gradle:

应用程序build.gradle：

android {
    dataBinding {
        enabled = true
    }
}

dependencies {
    kapt "com.android.databinding:compiler:$android_plugin_version"
}

kapt {
    generateStubs = true
}

回答by Pratik Butani

I found new solution, hope it will helps you.

我找到了新的解决方案，希望对您有所帮助。

First of all check whether plugin applied:

首先检查插件是否应用：

apply plugin: 'kotlin-kapt'

then

然后

android {
    ...
    ...
    dataBinding {
        enabled = true
    }
    ...
    ...
}

You might have an error in dependency:

你可能有依赖错误：

USE

用

kapt 'com.android.databinding:compiler:3.0.1'

instead of

代替

compile 'com.android.databinding:compiler:3.0.1'

You can visit herefor new version

您可以访问此处获取新版本

Thank you.

谢谢你。

回答by Sijansd

The version of Data Binding compiler is same as gradle version in your project build.gradle file:

数据绑定编译器的版本与项目 build.gradle 文件中的 gradle 版本相同：

// at the top of file 
apply plugin: 'kotlin-kapt'


android {
  dataBinding.enabled = true
}

dependencies {
  kapt "com.android.databinding:compiler:3.0.0-beta1"
}

and the gradle version is

和 gradle 版本是

classpath 'com.android.tools.build:gradle:3.0.0-beta1'

Here is an example link to complete using of databinding library in kotlin.

这是完成在 kotlin 中使用数据绑定库的示例链接。

https://proandroiddev.com/modern-android-development-with-kotlin-september-2017-part-1-f976483f7bd6

https://proandroiddev.com/modern-android-development-with-kotlin-september-2017-part-1-f976483f7bd6

回答by Shripal Shah

Add Databinding in android Project using when you have use kotlin language.

在使用 kotlin 语言时使用在 android 项目中添加数据绑定。

Below steps

以下步骤

--First you need to add the below plugin

--首先你需要添加以下插件

**apply plugin: 'kotlin-kapt'**

--Second dataBinding enabled true

--启用第二个数据绑定 true

**dataBinding {
        enabled = true
    }**

All this point added in app.build.gradle after hit "SYNC NOW"

点击“SYNC NOW”后，在 app.build.gradle 中添加了所有这些点

Lets For example you have edit profile activity then how to define binding variable in kotlin??

例如，您有编辑配置文件活动，那么如何在 kotlin 中定义绑定变量？

lateinit var buildProfileBinding: ActivityBuildProfileBinding

buildProfileBinding = getBinding()

Here,get binding is method to handle which type of binding object

这里get binding是处理绑定对象类型的方法

protected <T extends ViewDataBinding> T getBinding() {
                return (T) binding;
            }

回答by Mahmoud

In my case, adding

就我而言，添加

kapt {
    generateStubs = true
}

Solved the problem for me. I ignored it the first time, I thought it's irrelevant to the problem:

为我解决了问题。我第一次忽略它，我认为它与问题无关：

Unresolved reference databinding

未解析的参考数据绑定

But now, data-binding is working just fine.

但是现在，数据绑定工作得很好。

回答by RKS

Add following in you app build.gradle

在您中添加以下内容 app build.gradle

kapt "com.android.databinding:compiler:$android_plugin_version"
apply plugin: 'kotlin-kapt' // This one at top where plugin belong to

This will do the trick.

这将解决问题。

$android_plugin_versionis version of com.android.tools.build:gradlein application build.gradle

$android_plugin_version是com.android.tools.build:gradlein 的版本application build.gradle

Also, add this to your module build.gradle

另外，将此添加到您的模块中 build.gradle

android { /// Existing Code kapt { generateStubs = true } }

android { /// Existing Code kapt { generateStubs = true } }

回答by Sowattana Sigen

To Solve the problem, you have to put

要解决问题，你必须把

apply plugin: 'kotlin-kapt'

at the top of build.gradle (Module: app), then put this line in dependencies

在 build.gradle (Module: app) 的顶部，然后将此行放在依赖项中

kapt "com.android.databinding:compiler:[YOUR_ANDROID_PLUGIN_VERSION]"

You can find android plugin version by go to menu

您可以通过转到菜单找到 android 插件版本

File > Project Structure > Project

Then Sync Again. If you see this warning, ignore it.

然后再次同步。如果您看到此警告，请忽略它。

3rd-party Gradle plug-ins may be the cause

第 3 方 Gradle 插件可能是原因

回答by Jedsada Tiwongvorakul

Configuration data binding in kotlin

kotlin 中的配置数据绑定

build.gradle (folder app)

build.gradle（文件夹应用程序）

apply plugin: 'kotlin-kapt'

android {
   ...
   dataBinding {
      enabled = true
   }
}

dependencies {
   // data binding
   kapt "com.android.databinding:compiler:3.1.3"
}

Enjoy Kotlin...

享受科特林...