在platform --> android目录下找到build.gradle文件，打开并在def promptForReleaseKeyPassword() {...}函数前加入以下内容：

BUILD FAILED

Total time: 19.142 secs

ERROR: In <declare-styleable> FontFamilyFont, unable to find attribute android:ttcIndex

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':processDebugResources'.

> com.android.ide.common.process.ProcessException: 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.

Error: cmd: Command failed with exit code 1 Error output:

ERROR: In <declare-styleable> FontFamilyFont, unable to find attribute android:fontVariationSettings

ERROR: In <declare-styleable> FontFamilyFont, unable to find attribute android:ttcIndex

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':processDebugResources'.

> com.android.ide.common.process.ProcessException: 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.

[ERROR] An error occurred while running cordova build android (exit code 1).

执行命令ionic cordova platform add android

configurations.all {

  resolutionStrategy {

      force 'com.android.support:support-v4:27.1.0'

  }

}