Offensive Programming and a Preconditions helper
I recommend the whole presentation, but Offensive Programming part stuck with me (jump there).
You set your expectations about an argument or state, and raise an fatal exception if they're not met. Crash as soon as you can, so the problems doesn't trickle down the code and become harder to identify.
And since there are more tools for tracking crashes in Android, than for monitoring logs for warnings, bugs should get noticed and fixed quicker.