数据绑定未获得“标识符必须具有XML文件中的用户定义类型”错误

Question

I'm learning android data binding. The problem I'm facing is that in case of errors related to data binding with my current setup I'm getting very general error messages which give no clue of what and where has happened exactly instead of very specific ones that were mentioned in some topics on data binding ( for instance ).

Consider following layout:

<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">
    <data>
        <!--<import type="android.view.View"/>-->
        <!--<import type="android.text.TextUtils"/>-->
        <variable
            name="movie"
            type="us.kostenko.architecturecomponentstmdb.details.model.Movie" />
    </data>
    <TextView
        <!-- ... -->
        android:text="@{TextUtils.isEmpty(movie.release_date) ? @string/empty_date : movie.release_date}"/>
</layout>

Note that imports are commented out on purpose to trigger an error.

I expected to get something like Identifiers must have user defined types from the XML file. TextUtils is missing it Identifiers must have user defined types from the XML file. TextUtils is missing it error. But the error I'm getting is very general one:

    org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:kaptDebugKotlin'.
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.gradle.api.GradleException: Compilation error. See log for more details
    at org.jetbrains.kotlin.gradle.tasks.TasksUtilsKt.throwGradleExceptionIfError(tasksUtils.kt:16)
    at org.jetbrains.kotlin.gradle.internal.KaptWithKotlincTask.compile(KaptWithKotlincTask.kt:79)

I suspect there's something wrong with my setup. I'm using Android studio 3.1.4.

Here's my build.gradle

    apply plugin: 'com.android.application'
    apply plugin: 'kotlin-android'
    apply plugin: 'kotlin-kapt'
    apply plugin: 'kotlin-android-extensions'
    android {
    //...
        dataBinding { enabled = true }
    }

    dependencies {
        // ...
        kapt "com.android.databinding:compiler:3.1.4"
    }

And the project level one:

buildscript {
ext.kotlin_version = '1.2.70'
dependencies {
    classpath 'com.android.tools.build:gradle:3.1.4'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}

Any ideas what I'm missing here?

Answer 1

Here is mine, that is working fine, gives appropriate error, there is not too much difference. Try this...

app-level build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android-extensions'
android {
    compileSdkVersion 28
    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 28
    }
    dataBinding {
        enabled = true
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}
repositories {
    mavenCentral()
}

project-level build.gradle

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

buildscript {
    ext.kotlin_version = '1.2.70'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}