For years now I've had my share of productivity apps that I used. From simple analog notebooks to Wunderlist, from RememberTheMilk to Things. I've ...
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Mr.Kenneth could please recommend for Android as well. Because, Things is not available on Android
Sadly, I have no experience with applications on Android.
I think it's best to find something similar that has tags, deadlines, projects / areas and try to implement the same method :)
Sorry I can't be more of a help on Android stuff.