添加“local_auth”库后，Flutter应用程序无法运行

Question

我在Flutter项目中使用local_auth: 0.4.0+1库因为我需要它用于指纹认证，问题是当我运行它时会出现这个警告：

*********************************************************

WARNING: This version of local_auth will break your Android build if it or its dependencies aren't compatible with AndroidX.
         See  for more information on the problem and how to fix it.
         This warning prints for all Android build failures. The real root cause of the error may be unrelated.    
         *********************************************************

然后发生这种失败：

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugResources'.
 Android resource linking failed
  Output:  C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:328: error: resource android:attr/fontVariationSettings not found.
  C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\incremental\mergeDebugResources\merged.dir\values\values.xml:328: error: resource android:attr/ttcIndex not found.
  error: failed linking references.

  Command: C:\Users\emami\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\8e7abbb87897c27c7928ae79da9182a2\aapt2-3.2.1-4818971-windows\aapt2.exe link -I\
          C:\sdk\platforms\android-27\android.jar\
          --manifest\
          C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
          -o\
          C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
          -R\
          @C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
          --custom-package\
          com.example.flutterapp\
          -0\
          apk\
          --output-text-symbols\
          C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\symbols\debug\R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-windows Daemon #0
  Output:  C:\Users\emami\.gradle\caches\transforms-1\files-1.1\design-27.1.1.aar\2118f8390bba553635fd03361d6fcc0d\res\values\values.xml:96:5-202: AAPT: error: resource android:attr/fontVariationSettings not found.

  C:\Users\emami\.gradle\caches\transforms-1\files-1.1\design-27.1.1.aar\2118f8390bba553635fd03361d6fcc0d\res\values\values.xml:96:5-202: AAPT: error: resource android:attr/ttcIndex not found.

  error: failed linking references.
  Command: C:\Users\emami\.gradle\caches\transforms-1\files-1.1\aapt2-3.2.1-4818971-windows.jar\8e7abbb87897c27c7928ae79da9182a2\aapt2-3.2.1-4818971-windows\aapt2.exe link -I\
          C:\sdk\platforms\android-27\android.jar\
          --manifest\
          C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\merged_manifests\debug\processDebugManifest\merged\AndroidManifest.xml\
          -o\
          C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\processed_res\debug\processDebugResources\out\resources-debug.ap_\
          -R\
          @C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\intermediates\incremental\processDebugResources\resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          C:\Users\emami\AndroidStudioProjects\flutter_app\build\app\generated\not_namespaced_r_class_sources\debug\processDebugResources\r\
          --custom-package\
          com.example.flutterapp\
          -0\
          apk\
          --output-text-symbols\
          C:\Users\emami\AndroidStudioProjects\flutter_app\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 10s
Finished with error: Gradle task assembleDebug failed with exit code 1

我的Flutter SDK如下： sdk: ">=2.0.0-dev.68.0 <3.0.0" 有什么问题，我该如何解决？ 我猜可能是因为与我的Flutter SDK和local_auth版本冲突。

Answer 1

问题正是由于Flutter SDK和local_auth库的版本不兼容，我将其更改为local_auth: 0.3.0并且错误消失了。

Answer 2

让MainActivity继承FlutterFragmentActivity并将support-v4包添加到build.gradle，或使用androidx。可以参考the example