this is ts_quartetto product.
git clone https://github.com/tsukuba-pbl/16_4_Android.git
cd 16_4_Android
cp app/src/main/java/com/example/ts_quartetto/qrcodereader/ConfigExample.java app/src/main/java/com/example/ts_quartetto/qrcodereader/Config.java