Android Studio 3.0中解决apt报错，android-apt切换为官方annotationProcessor
最近从GitHub上Fork了一个项目，用Android Studio3 打开后
报错
Error:Cannot choose between the following configurations of project :EasyAdapterLibrary:
- debugApiElements
- debugRuntimeElements
- releaseApiElements
- releaseRuntimeElements
All of them match the consumer attributes:
- Configuration 'debugApiElements':
- Found com.android.build.api.attributes.BuildTypeAttr 'debug' but wasn't required.
- Found com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' but wasn't required.
- Found com.android.build.gradle.internal.dependency.VariantAttr 'debug' but wasn't required.
- Found org.gradle.api.attributes.Usage 'java-api' but wasn't required.
- Configuration 'debugRuntimeElements':
- Found com.android.build.api.attributes.BuildTypeAttr 'debug' but wasn't required.
- Found com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' but wasn't required.
- Found com.android.build.gradle.internal.dependency.VariantAttr 'debug' but wasn't required.
- Found org.gradle.api.attributes.Usage 'java-runtime' but wasn't required.
- Configuration 'releaseApiElements':
- Found com.android.build.api.attributes.BuildTypeAttr 'release' but wasn't required.
- Found com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' but wasn't required.
- Found com.android.build.gradle.internal.dependency.VariantAttr 'release' but wasn't required.
- Found org.gradle.api.attributes.Usage 'java-api' but wasn't required.
- Configuration 'releaseRuntimeElements':
- Found com.android.build.api.attributes.BuildTypeAttr 'release' but wasn't required.
- Found com.android.build.gradle.internal.dependency.AndroidTypeAttr 'Aar' but wasn't required.
- Found com.android.build.gradle.internal.dependency.VariantAttr 'release' but wasn't required.
- Found org.gradle.api.attributes.Usage 'java-runtime' but wasn't required.
原因
从Messages中并没有查看出是什么原因，但是此项目之前使用的AS2.1，并且gradle中使用了apt，所以我怀疑是Studio升级到3.0之后原来的配置方式apt与最新版本Gradle已经不兼容。
APT
APT(Annotation Processing Tool)是一种处理注释的工具,它对源代码文件进行检测找出其中的Annotation，使用Annotation进行额外的处理。
Annotation处理器在处理Annotation时可以根据源文件中的Annotation生成额外的源文件和其它的文件(文件具体内容由Annotation处理器的编写者决定),APT还会编译生成的源文件和原来的源文件，将它们一起生成class文件。
Android Gradle插件2.2版本发布后，Android 官方提供了
annotationProcessor来代替android-apt，annotationProcessor同时支持 javac 和 jack 编译方式，而android-apt只支持 javac 方式。同时android-apt作者宣布不在维护，当然目前android-apt仍然可以正常运行，如果你没有想支持 jack 编译方式的话，可以继续使用android-apt。Android Studio 3.0执行android-apt报错：
Android Studio 3.0执行android-apt一般会报错：
Error:android-apt plugin is incompatible with the Android Gradle plugin. Please use 'annotationProcessor' configuration instead.
解决
android-apt切换为官方annotationProcessor的方法
1、在build.gradle修改为Android Gradle 3.0 插件
buildscript {
repositories {
...
google()
}
- classpath 'com.android.tools.build:gradle:2.1.0'
+ classpath 'com.android.tools.build:gradle:3.0.1'
}
}
2、删除build.gradle里android-apt 的相关配置
项目目录下
buildscript {
repositories {
maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'}
jcenter()
}
dependencies {
- classpath 'com.android.tools.build:gradle:2.1.0'
- classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
+ classpath 'com.android.tools.build:gradle:3.0.1'
+ // classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
}
}
app目录下
- apply plugin: 'android-apt'
+ //apply plugin: 'android-apt'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
3、替换build.gradle里旧的配置为新的配置
做以下替换
- compile 改为 implementation,
- apt 改为 annotationProcessor
- testCompile 改为 androidTestImplementation
app目录下
// Annotation
- compile 'com.google.dagger:dagger:2.0.2'
- apt 'com.google.dagger:dagger-compiler:2.0.2'
+// compile 'com.google.dagger:dagger:2.0.2'
+// apt 'com.google.dagger:dagger-compiler:2.0.2'
+ implementation 'com.google.dagger:dagger:2.9'
+ annotationProcessor 'com.google.dagger:dagger-compiler:2.9'
+
4、清理缓存并重启Android Studio 3.0
参考：
https://www.jianshu.com/p/c1666a947692
https://majing.io/posts/10000003001155
