naming inconsistencies

If two simple lines (or one depending on your format liking) are already inconsistent, imagine what a 500k codebase will look like.

getInstance or newInstance?

Don't use getInstance() factory methods that in fact return new instances on every single call.

old proxy tunneling issue with java

So you happen to work in an environment where you're behind a proxy.

random ids in idea

Stop entering ad-hoc magic constants or 1,2,3,... sequences in your intent request codes, or build scripts to generate random translation keys.

comments formatting

Some people argue that if you do not intend to produce javadoc for your project, you should not clutter your comments with unnecessary <pre>, <blockquote>s and the likes