如何解决程序类型已经存在：com.google.zxing.BarcodeFormat in ionic 4

Question

我正在使用 ionic 4. 当我的项目有 facebook 插件和 BarcodeScanner 插件并输入ionic cordova run android 时，它会出现这个错误：

Command failed with exit code 1 Error output:
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
D8: Program type already present: com.google.zxing.BarcodeFormat

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.
> com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives:
  Program type already present: com.google.zxing.BarcodeFormat
  Learn how to resolve the issue at https://developer.android.com/studio/build/dependencies#duplicate_classes.

* 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.

我使用以下命令下载这两个插件：

ionic cordova plugin add phonegap-plugin-barcodescanner
npm install @ionic-native/barcode-scanner

ionic cordova plugin add cordova-plugin-facebook4 --variable APP_ID="app_id" --variable APP_NAME="app_name"
npm install --save @ionic-native/facebook

Answer 1

经过几周的搜索，以下步骤帮助我解决了问题：

1.删​​除android平台。

2.安装cordova-plugin-facebook4

3.在/plugins/cordova-plugin-facebook4/中创建build.gradle

4.复制

dependencies { compile("com.facebook.android:facebook-android-sdk:4.37.0") { exclude group: 'com.google.zxing' } }

到 ../plugins/cordova-plugin-facebook4/build.gradle

5.编辑../plugins/cordova-plugin-facebook4/plugins.xml更改

<framework src="com.facebook.android:facebook-android-sdk:$FACEBOOK_ANDROID_SDK_VERSION"/>

到

<framework src="build.gradle" custom="true" type="gradleReference"/>

6.添加android平台并构建