android - 找不到 com.android.databinding :compiler. 3.4.0

Question

大家好，我们如何在 android_plugin_version = '3.4.0' 中启用数据绑定(bind)？作为我的 android studio，我安装了最新版本，并且在将 android_plugin_version = '3.4.0' 降级到 3.2.xx 时收到另一个错误。

项目毕业

buildscript {
ext {
    kotlin_version = '1.3.31'
    android_plugin_version = '3.4.0'
}
repositories {
    google()
    jcenter()
    maven { url 'https://maven.google.com' }
}
dependencies {
    classpath "com.android.tools.build:gradle:$android_plugin_version"
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
  }
}

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

模块

 apply plugin: 'com.android.application'

 apply plugin: 'kotlin-android'

 apply plugin: 'kotlin-android-extensions'

 apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 28
    defaultConfig {
    applicationId "xxx.xxx.com"
    minSdkVersion 21
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner 
"android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}
dataBinding {
    enabled = true
}

kapt {
    generateStubs = true
  }
}

dependencies {
   implementation fileTree(dir: 'libs', include: ['*.jar'])
   implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
   implementation 'com.android.support:appcompat-v7:28.0.0'
   implementation 'com.android.support.constraint:constraint-layout:1.1.3'
   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'

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

同步没有问题，但是运行时，我收到了这个错误

Could not find com.android.databinding:compiler:3.4.0.
Searched in the following locations:

-

https://dl.google.com/dl/android/maven2/com/android/databinding/compiler/3.4.0/compiler-3.4.0.pom
- https://dl.google.com/dl/android/maven2/com/android/databinding/compiler/3.4.0/compiler-3.4.0.jar
- https://jcenter.bintray.com/com/android/databinding/compiler/3.4.0/compiler-3.4.0.pom
- https://jcenter.bintray.com/com/android/databinding/compiler/3.4.0/compiler-3.4.0.jar
- https://repo.maven.apache.org/maven2/com/android/databinding/compiler/3.4.0/compiler-3.4.0.pom
- https://repo.maven.apache.org/maven2/com/android/databinding/compiler/3.4.0/compiler-3.4.0.jar

Answer 1

您使用了错误版本的数据绑定(bind)编译器。对于最新版本，您可以查看 mvnrepository 等网站.目前最新版本是 3.4.0。
在这里，您传递了错误的版本:

 kapt "com.android.databinding:compiler:$android_plugin_version"

相反，使用这个:

kapt "com.android.databinding:compiler:3.4.0"

更新

在 Android Studio 3.3 及更高版本中，您不需要添加注释处理器 kapt "com.android.databinding:compiler:$android_plugin_version" .只需设置 dataBinding.enabled = true在您的模块 gradle 文件中或像这样:

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