android - Kotlin-DataBinding-错误 : Check your module classpath for missing or conflicting dependencies

Question

我怎么解决这个问题。我无法使这个数据绑定(bind)工作，我已经尝试了一切。
Build.gradle(模块应用程序)

    apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.fusion.alen.ask"
        minSdkVersion 16
        targetSdkVersion 27
        multiDexEnabled true
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        vectorDrawables.useSupportLibrary = true
    }
    androidExtensions {
        experimental = true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    dataBinding {
        enabled = true
    }

}

dependencies {
    implementation 'com.android.support:multidex:1.0.3'

    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support:animated-vector-drawable:27.1.1'
    implementation 'com.android.support:support-vector-drawable:27.1.1'
    implementation 'com.android.support:customtabs:27.1.1'
    implementation 'com.android.support:cardview-v7:27.1.1'
    implementation 'com.android.support:design:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    implementation 'com.android.support:recyclerview-v7:27.1.1'

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

apply plugin: 'com.google.gms.google-services'
apply plugin: 'kotlin-android-extensions'
repositories {
    mavenCentral()
}

我尝试添加 kapt "com.android.databinding:compiler:$compiler_version"但它给了我一个错误。
Build.gradle(模块项目)

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext{
        kotlin_version = '1.2.71'
        compiler_version = '3.2.1'
    }
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
        classpath 'com.google.gms:google-services:4.2.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

这是我的 profile_fragment.xml，我已按照文档说明进行操作

<layout xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <data>
        <variable
            name="user"
            type="com.alen.ask.UserModel.User" />
    </data>

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:layout_editor_absoluteY="25dp">


        <LinearLayout
            android:id="@+id/profile_box"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:background="@color/primaryColor"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/app_bar">

            <LinearLayout
                android:id="@+id/qff_box"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_weight="5"
                android:orientation="horizontal"
                android:baselineAligned="false">


                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:orientation="vertical">

                    <TextView
                        android:id="@+id/questions_number"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:textSize="18sp"
                        android:textStyle="bold"
                        **android:text="@{user.questionsNum}"************
                        tools:text="0" />

                </LinearLayout>

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:orientation="vertical">

                    <TextView
                        android:id="@+id/followers_number"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:textSize="18sp"
                        android:textStyle="bold"
                        **android:text="@{user.followersNum}"************
                        tools:text="0" />

                </LinearLayout>

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:orientation="vertical">

                    <TextView
                        android:id="@+id/following_number"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="center"
                        android:textSize="18sp"
                        android:textStyle="bold"
                        **android:text="@{user.followingNum}"***********
                        tools:text="0" />

                </LinearLayout>
            </LinearLayout>
        </LinearLayout>

        <LinearLayout
            android:id="@+id/app_bar"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:background="@color/primaryDarkColor"
            android:orientation="horizontal"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <TextView
                android:id="@+id/username_text"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_weight="1"
                **android:text="@{user.name}"**
                android:textColor="@color/primaryTextColor"
                android:textSize="18sp"
                android:layout_marginStart="8dp" />
        </LinearLayout>

    </android.support.constraint.ConstraintLayout>

</layout>

我的用户数据类:

data class User(val name: String,
                val email: String,
                val uid: String,
                val photo: String,
                val postsList: ArrayList<String> = ArrayList(),
                val questionsNum: Int = 0,
                val followersNum: Int = 0,
                val followingNum: Int = 0
                ) 

这是在 ProfileFragmen 类中，在 onCreateView 方法中

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val binding = ProfileFragmentBinding.inflate(inflater, container, false)
        binding.user = user
}

该行 binding.user = user 给了我错误: 无法访问类“UserModel.User”。检查您的模块类路径是否存在缺失或冲突的依赖关系
我该如何解决这个问题，我已按照 DataBinding 文档中的说明进行操作，我认为我没有犯任何错误。我曾尝试清理和重建项目，但没有奏效。我尝试添加那些“kapt”依赖项，但没有奏效....
文件->ProjectStructure->Gradle 版本:4.10.1，AndroidPluginVersion:3.2.1，KotlinLanguageVersion:1.2，KotlinPluginVersion:1.2.71-release-Studio3.2-1

谢谢你。

Answer 1

将您的文件夹 UserModel 重命名为 userModel 然后清理/重建您的项目。我遇到了同样的问题，将文件夹的第一个字母设置为小写时错误消失了。将来使用 camelCase 作为您的文件夹名称，就像变量一样。第一个字母的大写通常用于类。