使用Android Studio 3.0 Preview版，尝试了下Kotlin的DataBinding，踩了几个坑，记录一下，哈哈😄

------------------------ 更新于 2017-6-29------------------------

最新的Android Studio 3.0 Canary 4 + Kotlin 1.1.2-5 已经可以很愉快的玩耍DataBinding了，小伙伴们嗨起来🎵🎵🎵

附上完整 build.gradle 的配置
项目根目录下的 build.gradle

buildscript {
    ext.kotlin_version = '1.1.2-5'
    repositories {
        maven { url 'https://maven.google.com' }
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0-alpha4'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

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

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

module的build.gradle

apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"

    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            minifyEnabled false
        }
    }
    lintOptions {
        abortOnError false
    }
    //dataBinding
    dataBinding {
        enabled = true
    }
}

//每个module的dependencies貌似都需要依赖这两个鬼
dependencies {
    kapt "com.android.databinding:compiler:3.0.0-alpha3"
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
}

repositories {
    mavenCentral()
}

app的build.gradle与module的build.gradle 基本一样，只是defaultConfig多了applicationId

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

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "******"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            minifyEnabled false
            zipAlignEnabled false
            shrinkResources false
        }
    }
    lintOptions {
        abortOnError false
    }
    //dataBinding
    dataBinding {
        enabled = true
    }

}

dependencies {
    kapt "com.android.databinding:compiler:3.0.0-alpha3"
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

    implementation project(':******')
}

------------------------ 更新于 2017-6-23------------------------

1. Kotlin中使用DataBinding的Cannot find the setter for attribute问题

之前在library中使用databinding，或引入的第三方资源有使用databinding，会出现类似此种Cannot find the setter的问题

databinding Cannot find the setter for attribute 'android:onClick'

终于在最新版本修复了：
android studio升级到 Android Studio 3.0 Canary 4
kotlin插件升级到版本1.1.2-5

classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.2-5'

------------------------ 更新于 2017-5-27------------------------

1. DataBinding的配置

使用DataBinding的模块build.gradle中配置：

android {
    //dataBinding
    dataBinding {
        enabled = true
    }
}

2. Kotlin使用DataBinding的配置

app模块build.gradle中配置：

kapt {
    generateStubs = true
}

dependencies {
    kapt "com.android.databinding:compiler:2.3.0"
}

否则，安装app时候可能会：

Information:Gradle tasks [:app:assembleDebug]
xxx.kt
Error:(9, 20) Unresolved reference: databinding
Error:(19, 48) Cannot infer a type for this parameter. Please specify it explicitly.
Error:Execution failed for task ':app:compileDebugKotlin'.
> Compilation error. See log for more details
Information:BUILD FAILED in 6s

3. AndroidStudio3使用Kotlin

项目根build.gradle中配置：

dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0-alpha1'
        //classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.2-2'
    }

项目根gradle.properties中配置：

kotlin.incremental=false

否则，安装app时候可能会：

Information:Gradle tasks [:app:assembleDebug]
Error:Circular dependency between the following tasks:
:app:compileDebugKotlin
\--- :app:dataBindingExportBuildInfoDebug
     \--- :app:compileDebugKotlin (*)
(*) - details omitted (listed previously)
Information:BUILD FAILED in 2s

4. AndroidStudio3使用Kotlin+dataBinding

一个简单的错误，却困扰了我好久😂😂
先上解决办法
app模块build.gradle中配置：

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
//加上以下两行，搞定！
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'

否则，安装app时候会：

Information:Gradle tasks [:app:assembleDebug]
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
Information:BUILD FAILED in 4s
Information:1 error
Information:0 warnings
Information:See complete output in console

查看详细报错如下：

Destination for generated sources was modified by kapt. Previous value = /Users/ncm/xd/talk/app/build/generated/source/apt/debug

错误: 找不到注释处理程序 '__gen.AnnotationProcessorWrapper_debug_android_databinding_annotationprocessor_ProcessDataBinding'
1 个错误

:app:compileDebugJavaWithJavac FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:compileDebugJavaWithJavac'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:98)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:68)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:60)
    at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:88)
    at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.execute(DefaultTaskGraphExecuter.java:248)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.execute(DefaultTaskGraphExecuter.java:239)
    at org.gradle.internal.Transformers$4.transform(Transformers.java:169)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:114)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:68)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:239)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:226)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:120)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:77)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:101)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:95)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:527)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:95)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:46)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
Caused by: org.gradle.api.internal.tasks.compile.CompilationFailedException: Compilation failed; see the compiler error output for details.
    at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:48)
    at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:33)
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.delegateAndHandleErrors(NormalizingJavaCompiler.java:99)
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:52)
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:37)
    at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:35)
    at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:25)
    at org.gradle.api.tasks.compile.JavaCompile.performCompilation(JavaCompile.java:222)
    at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:207)
    at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:129)
    at com.android.build.gradle.tasks.factory.AndroidJavaCompile.compile(AndroidJavaCompile.java:49)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$IncrementalTaskAction.doExecute(DefaultTaskClassInfoStore.java:161)
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:132)
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:121)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.execute(ExecuteActionsTaskExecuter.java:115)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.execute(ExecuteActionsTaskExecuter.java:109)
    at org.gradle.internal.Transformers$4.transform(Transformers.java:169)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:114)
    at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:63)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:109)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:90)
    ... 26 more


BUILD FAILED in 2s
34 actionable tasks: 21 executed, 13 avoided (38%)

------------------------ over------------------------