Question

我正在使用Kotlin并尝试使用新的数据绑定库，但我得到了xxxBinding类的未解决的引用错误。

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
}

App 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)
}

应该生成

ActivityMainBinding，但事实并非如此。有没有办法解决这个问题？

Answer 1

问题在于使用ConstrainLayout代替layout。

使用数据绑定时，根布局必须是＆＃34; layout＆＃34;输入

待办事项

<?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>

唐＆＃39;吨

<?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>

Answer 2

使用'kotlin-android-extensions'时无需生成绑定。我们使用android数据绑定时需要它。现在，您可以使用片段/活动

中的view_id直接访问视图

Android数据绑定库 - 未解析的参考

2 个答案: