FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:proc...

在控制台执行flutter run指令启动flutter项目时，突然出现以下错误，懵了一下：

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugResources'.
> Android resource linking failed
  Output:  D:\flutter_shop\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:86: error: resource android:attr/fontVariationSettings not found.
  D:\flutter_shop\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:87: error: resource android:attr/ttcIndex not found.
  error: failed linking references.

  Command: C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\c6f034b22b3d3887225d461936d35a7f\aapt2-3.2.1-4818971-windows\aapt2.exe link -I\
          C:\Users\Administrator\AppData\Local\Android\sdk\platforms\android-27\android.jar\
          --manifest\
          D:\flutter_shop\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
          -o\
          D:\flutter_shop\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
          -R\
          @D:\flutter_shop\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          D:\flutter_shop\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
          --custom-package\
          com.example.fluttershop\
          -0\
          apk\
          --output-text-symbols\
          D:\flutter_shop\build\app\intermediates\symbols\debug\R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-windows Daemon #0
  Output:  C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\core-1.0.2.aar\71f3aaf5497578c2e474b508e78e8924\res\values\values.xml:89:5-125:25: AAPT: error: resource android:attr/fontVariationSettings not found.

  C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\core-1.0.2.aar\71f3aaf5497578c2e474b508e78e8924\res\values\values.xml:89:5-125:25: AAPT: error: resource android:attr/ttcIndex not found.

  error: failed linking references.
  Command: C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\c6f034b22b3d3887225d461936d35a7f\aapt2-3.2.1-4818971-windows\aapt2.exe link -I\
          C:\Users\Administrator\AppData\Local\Android\sdk\platforms\android-27\android.jar\
          --manifest\
          D:\flutter_shop\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
          -o\
          D:\flutter_shop\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
          -R\
          @D:\flutter_shop\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          D:\flutter_shop\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
          --custom-package\
          com.example.fluttershop\
          -0\
          apk\
          --output-text-symbols\
          D:\flutter_shop\build\app\intermediates\symbols\debug\R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-windows Daemon #0

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

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

BUILD FAILED in 7s
Running Gradle task 'assembleDebug'...
Running Gradle task 'assembleDebug'... Done                         7.8s
*******************************************************************************************
The Gradle failure may have been because of AndroidX incompatibilities in this Flutter app.
See https://goo.gl/CP92wY for more information on the problem and how to fix it.
*******************************************************************************************
Gradle task assembleDebug failed with exit code 1

尝试了几种方式之后都还是报错，好吧，继续找解决方案吧，哈哈，终于找到了：
在这里 找到了解决的办法 https://www.javaear.com/question/54472636.html

步骤如下：
（1）修改compileSdkVersion
在android/app/build.gradle下面修改compileSdkVersion 为28

image.png

(2)执行指令清理一下之前生成的一些文件

flutter clean

(3)在控制台重新启动flutter项目

flutter run

好了，项目终于又重新跑起来了~~~~~~~

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