In TabBarView you are calling pager.getAdapter().getPageTitle(i).toString() which will throw an NPE if it is unimplemented. Since getPageTitle is not abstract, the CharSequence returned should be checked.
https://github.com/Mirkoddd/TabBarView/blob/master/TabBarViewLibrary/src/com/mirko/tbv/TabBarView.java#L174
In
TabBarViewyou are callingpager.getAdapter().getPageTitle(i).toString()which will throw an NPE if it is unimplemented. SincegetPageTitleis not abstract, theCharSequencereturned should be checked.https://github.com/Mirkoddd/TabBarView/blob/master/TabBarViewLibrary/src/com/mirko/tbv/TabBarView.java#L174