Android File Choser

https://rogerkeays.com/simple-android-file-chooser

https://www.ulduzsoft.com/2012/07/android-dialog-to-choose-a-directory-or-file-based-on-alertdialog/

http://www.scorchworks.com/Blog/simple-file-dialog-for-android-applications/

https://developer.samsung.com/technical-doc/view.do?v=T000000089

https://github.com/RustamG/file-dialogs

RedMadRobot input-mask-android-Adjusted gradle installation tutorial to latest version.

https://github.com/RedMadRobot/input-mask-android/pull/55

https://github.com/RedMadRobot/input-mask-android/issues/54

Select data from two tables in Kotlin Anko SQLite

https://stackoverflow.com/questions/45912680/select-data-from-two-tables-in-kotlin-anko/50297372#50297372

Anko-SQLite: Enhancement: Add raw query example to documentation

https://github.com/Kotlin/anko/issues/623

Question: How can I do inner join queries on the same table with SQL aliasses (AS keyword) in Anko-SQLite?

https://github.com/Kotlin/anko/issues/622

https://github.com/Kotlin/anko/issues/623 
http://androidopentutorials.com/android-sqlite-join-multiple-tables-example/ 
https://stackoverflow.com/questions/45912680/select-data-from-two-tables-in-kotlin-anko/50297372#50297372