前言
我希望我的文章不要弯弯绕绕，直接贴代码希望大家可以看得懂，看完文章可以达到学习的第一个里程碑，至于后面原理慢慢的补上就是了，毕竟业务和解决问题优先嘛。
按照官方文档说明 androidx 是对 android.support.xxx 包的整理后产物。由于之前的support包过于混乱，所以，google推出了 androidX。
环境以及工具
AndroidStudio3.3
报错展示
Caused by: java.lang.RuntimeException: Failed to transform ‘C:\Users\admin.gradle\caches\modules-2\files-2.1\com.jakewharton\butterknife-compiler\8.8.1\b2f4505a1babb7b7c11abbbf8ea4c90b18c3aeac\butterknife-compiler-8.8.1.jar’ using Jetifier. Reason: The given artifact contains a string literal with a package reference ‘android.support.v4.content’ that cannot be safely rewritten. Libraries using reflection such as annotation processors need to be updated manually to add support for androidx… (Run with --stacktrace for more details.)
Caused by: java.lang.IllegalArgumentException: The given artifact contains a string literal with a package reference ‘android.support.v4.content’ that cannot be safely rewritten. Libraries using reflection such as annotation processors need to be updated manually to add support for androidx.
问题分析
报错看重点
butterknife-compiler-8.8.1.jar’ using Jetifier
need to be updated manually to add support for androidx
The given artifact contains a string literal with a package reference ‘android.support.v4.content’ that cannot be safely rewritten.
既然定位到ButterKnife的问题，那就直接去JakeWharton的butterknife提问中找答案，猜测应该有人踩过坑。
在githup JakeWharton的项目中一搜，果然，前辈还是没让我失望的。
ClassName.get(“android.support.v4.content”, “ContextCompat”);由于在Androidx项目已经找不到android.support.v4.content包了，所以get()就报错了。
整体步骤
哈哈…隔，上面都在吹逼了。其实解决很简单的，就是更新下JakeWharton的butterknife就ok了。
app build.gradle
//引入ButterKnife
implementation "com.jakewharton:butterknife:10.0.0"
kapt "com.jakewharton:butterknife-compiler:10.0.0"
1
2
3
对于kapt陌生的，可以自行看下
Kotlin重构如何兼容原先的ButterKnife、EventBus3.1
开开心心的将项目运行一下…又报错了
Caused by: com.android.tools.r8.utils.AbortException: Error: Static interface methods are only supported starting with Android N (–min-api 24): void butterknife.Unbinder.lambda $ static $0()
小问题，看到lambda语法，哦，那就将compileOptions中的java版本改下就ok了
android {
compileSdkVersion 28
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
defaultConfig { }
}
1
2
3
4
5
6
7
8
9
Kotlin重构系列分享教程
Kotlin环境搭建
Kotlin重构初体验之告别FindViewById
Kotlin重构如何兼容原先的ButterKnife、EventBus3.1