前几天，Android Studio终于推送了3.0.0的Stable正式版。其实3.0.0版本的Canary版本都发布很久了，Beta版也发了好几版了。但是我在公司的电脑跟家里的个人电脑的开发环境要保持一致，所以为了工作，我的Android Studio一直采取比较保守的更新策略，只用稳定版本。但既然3.0.0的稳定版都出来了，再不更新那我就没有理由了。
不出意外的、非常正常的、合乎情理的，在从2.3.3升级到3.0.0后，原来的项目无法通过编译了，毕竟这是一次比较大的IDE更新，出问题安全可以理解。还是来看一下有啥问题，以及如何解决吧:
1、Error:android-apt plugin is incompatible with the Android Gradle plugin. Please use 'annotationProcessor' configuration instead.
该问题发生在module级的build.gradle文件里，一般发生在你的application模块。
最新版Android Studio所搭配的com.android.tools.build:gradle:3.0.0及更高版本不支持目前1.8版本的apt了，所以先把project的build.gradle中
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
删掉。然后把module的build.gradle中的
apply plugin: 'com.neenbedankt.android-apt'
也删掉。再把之前dependencies中类似于
apt 'com.jakewharton:butterknife-compiler:8.8.1'
中的apt换成annotationProcessor，OK问题解决。
2、Error:Cannot choose between the following configurations of project :RTRoutineLib:
- 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.
OK，细心的朋友可以发现这是项目主module所依赖的一个library报错了。改动很容易，把主module的build.gradle中的
compile project(':RTRoutineLib')
改成
implementation project(':RTRoutineLib')
即可。至于compile和implementation的区别，这足以单独列一篇文章了，咱今后再说。
解决了这2个问题，一般大多数工程跑起来是没问题的。感受一下Android Studio 3.0.0带来的强大功能吧。据我所知，很多开发者非常不愿意更新IDE，但现在是移动互联网时代，你用IDE开发的App会经常更新，那么Google发布的给你用来开发App的IDE进行更新也是不难理解的。一个程序员如果抱守残缺，那么其竞争力恐怕很难长久保持。
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