How to solve Program type already present: com.google.zxing.BarcodeFormat in ionic 4

Question

I am using ionic 4. When my project have facebook plugin and BarcodeScanner plugin and type ionic cordova run android, it will come out this error:

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.

I download both plugin using these command:

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

After weeks of searching, the following steps help me resolve the issue like a charm:

1.Remove android platform.

2.Install cordova-plugin-facebook4

3.Create build.gradle in /plugins/cordova-plugin-facebook4/

4.Copy

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

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

5.Edit ../plugins/cordova-plugin-facebook4/plugins.xml change

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

to

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

6.Add android platform and build

Answer 2

This might be a dependency issue.

If a class appears more than once on the runtime classpath, you get an error similar to the following:

Program type already present com.example.MyClass

This error typically occurs due to one of the following circumstances:

A binary dependency includes a library that your app also includes as a direct dependency.

For example, your app declares a direct dependency on Library A and Library B, but Library A already includes Library B in its binary. To resolve this issue, remove Library B as a direct dependency.

Your app has a local binary dependency and a remote binary dependency on the same library.

To resolve this issue, remove one of the binary dependencies, delete the redundant one. ( See if same library is added as a dependency)

Follow this link for more details - Here