Recently joined new Android app (product) based project & got source code of existing prod app version.

Product source code must be easy to understand so that it could be supported for long term. In contrast to that, existing source structure is much difficult to understand.

Package structure is flat only 3 packages ui, service, utils. No module based grouped classes.

No memory release is done. So on each screen launch new memory leaks keep going on & on.

Too much duplication of code. Some lazy developer in the past had not even made wrappers to avoid direct usage of core classes like Shared Preference etc. So at each place same 4-5 lines were written.

Too much if-else ladders (4-5 blocks) & unnecessary repetitions of outer if condition in inner if condition. It looks like the owner of this nested if block implementation has trust issues, like that person thought computer 'forgets' about outer if when inside inner if.

Too much misuse of broadcast receiver to track activities' state in the era of activity, apપ life cycle related Android library.

Sometimes I think why people waste soooo... much efforts in the wrong direction & why can't just use library?!!

These things are found without even deep diving into the code, I don't know how much horrific things may come out of the closet.

This same app is being used by many companies in many different fields like banking, finance, insurance, govt. agencies etc.

Sometimes I surprise how this source passed review & reached the production.