Butterknife: cannot find R2 in AS 3.3.1

[usherjc]

project build.gradle

 dependencies {
        classpath 'com.android.tools.build:gradle:3.1.4'
        classpath 'com.jakewharton:butterknife-gradle-plugin:8.4.0'
    }

module build.gradle

apply plugin: 'com.jakewharton.butterknife'

dependencies {
    api project(':modules:base')
    api 'com.jakewharton:butterknife:8.4.0'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'
}

which is can display normally in AS 3.2.1.
and I update AS to version 3.3.1, you can see that R2 is red in IDE, but it can be run and build apks and can be debug in AS. anyway I tried all the idea in the net, and I still cannot resolve the problem.

Chinese Translation：
以上是我的项目中引用的信息，升级AS到3.3.1后，显示R2类找不到，报红，但是项目可以正常运行，也可以正常调试生成APK，但是以上R2报红的问题一直存在，无法解决。请问有没有方法可以解决这个问题？

[usherjc]

I also tried the butterknife 8.5.1/8.6.0/9.0.0/10.0.0 ... but the project build failed with them
and the butterknife8.4.0 works normally in AS 3.2.1 so I am confused with that, and there is much less info about this on the net.

[usherjc]

when I change this

classpath 'com.jakewharton:butterknife-gradle-plugin:10.1.0'

others not changed

everything ok!!!

amazing...

[alen252]

I also got this question.

[CodeSaid]

Thanks! bro, This question has trouble me for days

[alen252]

But my project does not support Android X. I still can not use 10.1.0.
How to solve my problem.

[JakeWharton]

Use 9.0.0

On Thu, Mar 7, 2019 at 10:43 PM alen252 [e-mail] wrote:

But my project does not support Android X. I still can not use 10.1.0.
How to solve my problem.

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[alen252]

Use 9.0.0
…
On Thu, Mar 7, 2019 at 10:43 PM alen252 @.*> wrote: But my project does not support Android X. I still can not use 10.1.0. How to solve my problem. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#1481 (comment)>, or mute the thread https://github.com/notifications/unsubscribe-auth/AAEEESxH4cnYfuLQCitEA2VRuptULY09ks5vUdxPgaJpZM4bYm1f .

After i upgrade to 9.0.0. I got my project compile error: Program type already present: android.support.v4.app.FrameMetricsAggregator$FrameMetricsBaseImpl

[itzuo]

我也遇到这个问题了，怎么解决啊

[usherjc]

@alen252 项目不支持Android X是啥意思...

[usherjc]

@itzuo 我写那么清楚你看不懂吗...

[usherjc]

@alen252 尝试一下升级android support库到27.0.3，compileSdkVersion 升级到 27，如果报红看一些报红的文字逐个解决。

[alen252]

@usherjc 谢谢