detector.isOperational() always false on android

Question

I\'m using the new google plays service: Barcode detector, for this porposue I\'m following this tutorial : https://search-codelabs.appspot.com/cod

Answer 1

Here is what was my case. I was using BarcodeDetector for decoding QR codes from imported images. On 4 my testing devices it was working fine. On one was not reading anything from bitmap. I thought this might be incompatibility with android 5.0 but this was not the case. After hours of investigation I finally noticed that detector.isOperational(); returns false. The reason was:

The first time that an app using barcode and/or face APIs is installed on a device, GMS will download a libraries to the device in order to do barcode and face detection. Usually this is done by the installer before the app is run for the first time.

I had wi-fi off on that testing device. After turning it on and relaunching app, detector became operational and started decoding bitmaps.