Flutter - AAPT: error: resource android:attr/dialogCornerRadius not found. _Resource

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Launching lib\\main.dart on Nokia X6 in debug mode...FAILURE: Build failed with an exception.* What went wrong: Execution failed for task \':app:processDebugResources\'. > android resource linking failed Output:E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\incremental\\mergeDebugResources\\merged.dir\\values-v28\\values-v28.xml:7: error: resource android:attr/dialogCornerRadius not found. E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\incremental\\mergeDebugResources\\merged.dir\\values-v28\\values-v28.xml:11: error: resource android:attr/dialogCornerRadius not found. E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\incremental\\mergeDebugResources\\merged.dir\\values\\values.xml:959: error: resource android:attr/fontVariationSettings not found. E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\incremental\\mergeDebugResources\\merged.dir\\values\\values.xml:960: error: resource android:attr/ttcIndex not found. error: failed linking references.Command: C:\\Users\\hupo3\\.gradle\\caches\\transforms-1\\files-1.1\\aapt2-3.2.1-4818971-windows.jar\\c1441429ce2aae0e0bed3ad48db2b49e\\aapt2-3.2.1-4818971-windows\\aapt2.exe link -I\\ C:\\Users\\hupo3\\AppData\\Local\\Android\\sdk\\platforms\\android-27\\android.jar\\ --manifest\\ E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\merged_manifests\\debug\\processDebugManifest\\merged\\AndroidManifest.xml\\ -o\\ E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\processed_res\\debug\\processDebugResources\\out\\resources-debug.ap_\\ -R\\ @E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\incremental\\processDebugResources\\resources-list-for-resources-debug.ap_.txt\\ --auto-add-overlay\\ --java\\ E:\\Flutter Projects\\intro_to_flutter\\build\\app\\generated\\not_namespaced_r_class_sources\\debug\\processDebugResources\\r\\ --custom-package\\ com.xiaobing.introtoflutter\\ -0\\ apk\\ --output-text-symbols\\ E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\symbols\\debug\\R.txt\\ --no-version-vectors Daemon:AAPT2 aapt2-3.2.1-4818971-windows Daemon #0 Output:C:\\Users\\hupo3\\.gradle\\caches\\transforms-1\\files-1.1\\appcompat-v7-28.0.0.aar\\12aaee80bab0fcaef8511d3958ba785b\\res\\values-v28\\values-v28.xml:9:5-12:13: AAPT: error: resource android:attr/dialogCornerRadius not found.E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\incremental\\mergeDebugResources\\merged.dir\\values-v28\\values-v28.xml:11: AAPT: error: resource android:attr/dialogCornerRadius not found.C:\\Users\\hupo3\\.gradle\\caches\\transforms-1\\files-1.1\\support-compat-28.0.0.aar\\b1fc0e0ff1348f4d278539eb80ede9d3\\res\\values\\values.xml:89:5-125:25: AAPT: error: resource android:attr/fontVariationSettings not found.C:\\Users\\hupo3\\.gradle\\caches\\transforms-1\\files-1.1\\support-compat-28.0.0.aar\\b1fc0e0ff1348f4d278539eb80ede9d3\\res\\values\\values.xml:89:5-125:25: AAPT: error: resource android:attr/ttcIndex not found.error: failed linking references. Command: C:\\Users\\hupo3\\.gradle\\caches\\transforms-1\\files-1.1\\aapt2-3.2.1-4818971-windows.jar\\c1441429ce2aae0e0bed3ad48db2b49e\\aapt2-3.2.1-4818971-windows\\aapt2.exe link -I\\ C:\\Users\\hupo3\\AppData\\Local\\Android\\sdk\\platforms\\android-27\\android.jar\\ --manifest\\ E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\merged_manifests\\debug\\processDebugManifest\\merged\\AndroidManifest.xml\\ -o\\ E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\processed_res\\debug\\processDebugResources\\out\\resources-debug.ap_\\ -R\\ @E:\\Flutter Projects\\intro_to_flutter\\build\\app\\intermediates\\incremental\\processDebugResources\\resources-list-for-resources-debug.ap_.txt\\ --auto-add-overlay\\ --java\\ E:\\Flutter Projects\\intro_to_flutter\\build\\app\\generated\\not_namespaced_r_class_sources\\debug\\processDebugResources\\r\\ --custom-package\\ com.xiaobing.introtoflutter\\ -0\\ apk\\ --output-text-symbols\\ E:\\Flutter Projects\\intro_to_flutter\\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.orgBUILD FAILED in 18s Gradle task assembleDebug failed with exit code 1 Exited (sigterm)

打开android\\app\\build.gradle
【Flutter - AAPT: error: resource android:attr/dialogCornerRadius not found.】修改 compileSdkVersion 和 targetSdkVersion