These two codes can not be scanned

[marcelr]

Hi,

I have these two codes:

• On native Android 13 the bottom code is scanned, but not the top one
• Using zxing in my App can't scan both

opts.setDesiredBarcodeFormats(ScanOptions.ALL_CODE_TYPES); // does not help

Any idea how to proceed?

Thank you
Marcel

[acaliaro]

I can scan both using Scandit Demo App. The first is a datamatrix. The second a qrcode

[rkistner]

These examples are white-on-black instead of the typical black-on-white. To scan them, use INVERTED_SCAN or MIXED_SCAN mode:

zxing-android-embedded/sample/src/main/java/example/zxing/MainActivity.java

Lines 52 to 56 in d09b7c7

	public void scanBarcodeInverted(View view){
	ScanOptions options = new ScanOptions();
	options.addExtra(Intents.Scan.SCAN_TYPE, Intents.Scan.INVERTED_SCAN);
	barcodeLauncher.launch(options);
	}

[marcelr]

Thank you, this does now everything I need:

options.addExtra(Intents.Scan.SCAN_TYPE, Intents.Scan.MIXED_SCAN); // for white on black codes

I didn't notice that the performance of scanning was decreased by allowing mixed scans, probably having this as default is a good idea?