Make numpad work better in number picker dialog

[hiqua]

#922

• Make both NumberPickers focusable.
• Make the second NumberPicker have 0.01 increments instead of 0.05.
• Ensure that typing "." in the numpad switches the focus from the first NumberPicker to the second and selects the current number, so that typing "3.14" works as expected.

Currently, entering the decimal part via the numpad has no effect.

I'm trying to listen to key events to switch from one NumberPicker to the other, but I don't see any event for the non-digit (soft) keys. This might be relevant: https://developer.android.com/training/keyboard-input/commands (we cannot rely on such key events).

[hiqua]

I wanted to use a TextWatcher to check that a separator is entered, but the filters remove it before it reaches the watcher, hence the current solution. Curious what you'll think about it / whether you think there's a better way.

I don't think I've seen https://code.google.com/p/android/issues/detail?id=35482 at least not with this PR, when does it occur? In the meantime I've deleted the corresponding workaround, as it allowed dots in the fractional part. If we need to put it back, I need to find out how to prevent that.

Still not perfect / to follow up:

• for the fractional part, if only one digit is entered, it should be multiplied by 0.1 instead of 0.01
• if possible, we should probably force the keyboard to always be open, instead of closing it if the user starts scrolling

[iSoron]

Thanks for the PR, @hiqua. I've tested it and it seems to be working quite well.

I don't think I've seen https://code.google.com/p/android/issues/detail?id=35482 at least not with this PR, when does it occur? In the meantime I've deleted the corresponding workaround, as it allowed dots in the fractional part. If we need to put it back, I need to find out how to prevent that.

I have also tried to reproduce the bug in your version of the code, but I couldn't. I think it's fine to remove the workaround.