Using this repository:
After cloning this repository, you might notice a problem with the scanner. This is caused by the scanner plugin requiring FlutterFragmentActivity instead of FlutterActivity. for more info, read: AmolGangadhare/flutter_barcode_scanner#128
To fix this issue:
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Go to C:\flutter.pub-cache\hosted\pub.dartlang.org\flutter_barcode_scanner-1.0.1\android\src\main\java\com\amolg\flutterbarcodescanner\BarcodeCaptureActivity.java
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In the file FlutterBarcodeScannerPlugin.java, modify all references from FlutterActivity to FlutterFragmentActivity.