The most used open source bar code engine is zxing. I do not want to dwell into the details of zxing. Please go to the site to know more. It is used by almost all platforms (except Windows Mobile?).
I downloaded the version 1.3 from there and compiled it for Android. I followed the instructions to the dot and still it did not work. Compilation of ZXing threw several unreported IOException errors. I added IOException handling in two files CameraManager.java and CaptureActivity.java and it went away. I also changed the build.properties at the top level of zxing folder for correct path settings and the compilation was finally successful. Then I figured out that these changes had been made in the svn repository 
The compilation is complete and has no errors, now, what next?
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