Combine declaration and initialization.
Use equals(String) instead of matches(String) as the String is constant, not a regex.
Reduce potential for NPEs.
Remove unnecessary casts.
Remove unneeded field: a Service is a ContextWrapper
Convert fields to constants.
Convert fields to local variables.
Remove empty branches.
Replace else with nested if with `else if`
Remove method call with ignored return value.
Convert field to local variable.
Reduce scope of local variables.
Remove unnecessary qualifier.
Remove duplicate method call.  The title has already been enabled in onCreate(...)
Reduce coupling between Activity and Fragments.  Reduce static state to prevent potential NPEs.
Convert field to local variable.
Simplification: A FragmentActivity is a Context.
Remove static state.
DRY.
Remove redundant initialization: the title is disabled by default.