[Android] Log

The order in terms of verbosity, from least to most is ERROR, WARN, INFO, DEBUG, VERBOSE.

• Verbose should never be compiled into an application except during development.
• Debug logs are compiled in but stripped at runtime.
• Error, warning and info logs are always kept.

• When you're building the string to pass into Log.d, the compiler uses a StringBuilder and at least three allocations occur: 
• the StringBuilder itself
• the buffer
• the String object.
• Realistically, there is also another buffer allocation and copy, and even more pressure on the gc.
• That means that if your log message is filtered out, you might be doing significant work and incurring significant overhead.

* Reference
- Log | Android Developers