Spell4Wiki is a mobile application to record and upload audio for Wiktionary words to Wikimedia Commons. Spell4Wiki also a multilingual Wiki-Dictionary.
I guess using either of those approaches is enough. I personally prefer the former as it does not require me to move my finger to complete the action of exiting ;-) Personally, I also don't like pop-ups a lot.
The message in the toast is misleading. I'm asked whether to exit the app via the prompt despite the toast mentioning I can exit the app by hitting back again.
The app seems to use a mixup of 2 methods:
I guess using either of those approaches is enough. I personally prefer the former as it does not require me to move my finger to complete the action of exiting ;-) Personally, I also don't like pop-ups a lot.