添加cordova-plugin-file-opener2后，打包出错

原文:添加cordova-plugin-file-opener2后，打包出错

报错如下：

* What went wrong:

Execution failed for task ':app:processDebugResources'.
> Failed to execute aapt

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug
option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 7s
(node:7000) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejec
tion id: 1): Error: cmd: Command failed with exit code 1 Error output:
C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\support-compat-28.0
.0-alpha1.aar\958f18514ef6665a8a428677fe3825c9\res\values\values.xml:20:5-70: AA
PT: error: resource android:attr/fontVariationSettings not found.

C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\support-compat-28.0
.0-alpha1.aar\958f18514ef6665a8a428677fe3825c9\res\values\values.xml:20:5-70: AA
PT: error: resource android:attr/ttcIndex not found.

D:\cordova\workspace\bbb\platforms\android\app\build\intermediates\incremental\m
ergeDebugResources\merged.dir\values\values.xml:86: error: resource android:attr
/fontVariationSettings not found.
D:\cordova\workspace\bbb\platforms\android\app\build\intermediates\incremental\m
ergeDebugResources\merged.dir\values\values.xml:86: error: resource android:attr
/ttcIndex not found.

error: failed linking references.

此问题基本是grade版本冲突问题，本人找到的解决方法是，在打包目录下与**\platforms\android\app，在与build.gradle同一级目录下，创建文件，名称为build-extras.gradle，内容为

configurations.all {
    resolutionStrategy {
        force 'com.android.support:support-v4:27.1.0'
    }
}