Android数据绑定库-未解决的参考 [英] Android Data Binding library - unresolved reference
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问题描述
我正在使用Kotlin并尝试使用新的数据绑定库,但是对于xxxBinding
类,我得到了未解决的引用错误.
I am using Kotlin and trying to use new Data Binding Library, but I get unresolved refernce error for xxxBinding
classes.
顶级build.gradle
buildscript {
ext.kotlin_version = '1.2.30'
ext.gradle_version = '3.1.0'
repositories {
google()
jcenter()
}
dependencies {
classpath "com.android.tools.build:gradle:$gradle_version"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath 'com.google.gms:google-services:3.2.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
应用程序build.gradle
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
apply plugin: 'com.google.gms.google-services'
android {
buildToolsVersion "27.0.3"
compileSdkVersion 27
defaultConfig {
applicationId "ru.vstu.clustermonitor"
minSdkVersion 15
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
dataBinding {
enabled = true
}
}
repositories {
maven {
url 'https://dl.bintray.com/terrakok/terramaven/'
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.0'
implementation 'com.android.support:support-vector-drawable:27.1.1'
implementation 'com.android.support:support-v4:27.1.1'
implementation 'com.android.support:recyclerview-v7:27.1.1' // RecycleView
implementation 'com.android.support:cardview-v7:27.1.1' // CardView
implementation 'android.arch.navigation:navigation-fragment:1.0.0-alpha01' // Navigation Architecture Components (remove)
kapt "com.android.databinding:compiler:$gradle_version"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
MainActivity.onCreate
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val binding : ActivityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
}
ActivityMainBinding
应该生成,但是没有生成.有什么办法可以解决这个问题?
ActivityMainBinding
should be generated, but It didn't. Is there any way to fix this problem?
推荐答案
问题出在使用ConstrainLayout
而不是layout
.
使用数据绑定时,根布局必须为布局"类型
做
<?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>
<variable
name="MyVariable"
type="com.mycompany.myproject.MyType"/>
</data>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Views.Fragments.QueueFragment"
android:background="#fff">
...
</android.support.constraint.ConstraintLayout>
</layout>
不要
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<data>
<variable
name="MyVariable"
type="com.mycompany.myproject.MyType"/>
</data>
...
</layout>
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