在使用kotlin+databinding时遇到不少坑，整理了一个Demo，大致如下：
注：
如果你的kotlin项目要配置databinding，请务必注意各个插件和依赖的版本，build成功，不代表可以运行成功，需要多多尝试
这些版本是我在写这篇文章时用到的，当你看到此文时，也许各个插件版本都更新了很多，或者比我的还旧，所以在使用插件时，一定要注意其他插件与它是否兼容，不要在这些配置上浪费时间。
- 项目 build.gradle文件
buildscript {
//定义全局的两个变量，方便后面引用
ext.kotlin_version = '1.1.51'//kotlin版本
ext.gradle_version = '2.3.3'//gradle版本
repositories {
jcenter()
}
dependencies {
classpath "com.android.tools.build:gradle:$gradle_version"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
- 模块 build.gradle文件
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'//kotlin配置
apply plugin: 'kotlin-kapt'//kapt 插件
android {
compileSdkVersion 26
buildToolsVersion "26.0.0"
defaultConfig {
applicationId "leong.fish.kt.kotlindatabinding"
minSdkVersion 19
targetSdkVersion 26
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
//开启dataBinding
dataBinding {
enabled = true
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
kapt "com.android.databinding:compiler:$gradle_version"//这里的版本对应gradle的版本
}
- 实体类 Person.kt
package leong.fish.kt.kotlindatabinding
/**
* Created by Leong on 2017/10/26.
*/
class Person(val name: String, val age: Int) {
}
- 布局 activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout
<data>
<variable
name="person"
type="leong.fish.kt.kotlindatabinding.Person" />
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{person.name}" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text='@{String.valueOf(person.age)}' />
</LinearLayout>
</layout>
- MainActivity.kt
package leong.fish.kt.kotlindatabinding
import android.app.Activity
import android.databinding.DataBindingUtil
import android.os.Bundle
import leong.fish.kt.kotlindatabinding.databinding.ActivityMainBinding
class MainActivity : Activity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)
binding.person = Person("fish leong", 18)
}
}
-
运行截图
-
项目结构
- 结束
以上就是kotlin + databinding的基础配置。
异常信息处理
Error:java.lang.RuntimeException: failure, see logs for details.
e: java.lang.IllegalStateException: failed to analyze: java.lang.RuntimeException: failure, see logs for details.
cannot generate view binders java.lang.RuntimeException: failure, see logs for details.
Cannot resolve type for SafeVarargs
at android.databinding.tool.util.L.printMessage(L.java:125)
at android.databinding.tool.util.L.e(L.java:98)
at android.databinding.tool.expr.Expr.getResolvedType(Expr.java:361)
at android.databinding.tool.expr.ExprModel.lambda$resolveTypes$1(ExprModel.java:604)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at android.databinding.tool.expr.ExprModel.resolveTypes(ExprModel.java:604)
at android.databinding.tool.expr.ExprModel.seal(ExprModel.java:396)
at android.databinding.tool.LayoutBinder.sealModel(LayoutBinder.java:340)
at android.databinding.tool.DataBinder.sealModels(DataBinder.java:65)
at
at android.databinding.annotationprocessor.ProcessExpressions.writeResourceBundle(ProcessExpressions.java:184)
at android.databinding.annotationprocessor.ProcessExpressions.onHandleStep(ProcessExpressions.java:86)
at android.databinding.annotationprocessor.ProcessDataBinding$ProcessingStep.runStep(ProcessDataBinding.java:189)
at android.databinding.annotationprocessor.ProcessDataBinding$ProcessingStep.access$000(ProcessDataBinding.java:174)
at android.databinding.annotationprocessor.ProcessDataBinding.process(ProcessDataBinding.java:79)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1068)
at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:73)
at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing$default(annotationProcessing.kt:42)
at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.runAnnotationProcessing(Kapt3Extension.kt:205)
at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.analysisCompleted(Kapt3Extension.kt:166)
at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.analysisCompleted(Kapt3Extension.kt:82)
at org.jetbrains.kotlin.resolve.jvm.TopDownAnalyzerFacadeForJVM$analyzeFilesWithJavaIntegration$2.invoke(TopDownAnalyzerFacadeForJVM.kt:89)
at org.jetbrains.kotlin.resolve.jvm.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:99)
at org.jetbrains.kotlin.resolve.jvm.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:76)
at
at
at
at
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:167)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:55)
at
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at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
上面这个异常，很蛋疼，build可以成功，但是运行时就build失败，找了好多帖子都解决不了我的问题，后来发现是compileSdkVersion版本问题，compileSdkVersion>=19
2.缺少依赖问题
Error:(6, 40) Unresolved reference: databinding
Error:(12, 54) Unresolved reference: ActivityMainBinding
Error:Execution failed for task ':app:compileDebugKotlin'.
> Compilation error. See log for more details
请检查模块build.gradle中kapt配置，如下
apply plugin: 'kotlin-kapt'//kapt 插件
dependencies {
kapt "com.android.databinding:compiler:$gradle_version"//这里的版本对应gradle的版本
}