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I just noticed some differences and was wondering specifically if I modify java source in the source area of the app builder does that compile my changes when exporting my apk. One thing that I noticed was the scanning window for the barcode changed size between the app tester and the apk. I'm not sure whether this was due to compiling my changes or just the way the tester works.
Hello Miguel,
Could you please provide us screenshots of what you get on a device and in the tester? Also please specify what device with what OS do you use.
Tester app barcode scanner
apk export scanner 
exported apk
tester app 
The main thing I want to know is if I modify java source for the barcode scanner in the builder are those changes compiled. I might have fixed this issue myself or it's just an issue with the tester app.
Miguel,
The size of the scanning square may differ because of the screen resolution. You may try to change it by changing java files of scanner plugin at the source tab, but this is outside the scope of our support.
So if I change scanner files... this is compile when I produce an apk, but is not used for the tester?
Miguel, you are right