digits input

[hidden-dimensions]

The multiple digit input we seen in SMS validation.

• configurable length (default 4)
• focusable
• style
  • numpad input
  • number pickers (rolling)
• delegate
  • onChange

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Implementation suggestion
Create a hidden EditText as input and check with TextWatcher, and update the digits accordingly. Each digit should have an empty state (ie. _) and filled state (ie. x)