Added open and close functionality of Soft keyboard

[gunkiratk]

Closed #297

[omerjerk]

Looks good to me.

[codeanticode]

@gunkiratk @omerjerk

openKeyboard() and closeKeyboard() are already included in PApplet. In what way are the ones proposed in this PR different and/or better?

[gunkiratk]

@codeanticode When we cloned the repo ,both the functions were not included.
So we implemented them.

[codeanticode]

Ok, got it. Looks like the only difference is that in the current code I'm using the InputMethodManager .showSoftInput/hideSoftInputFromWindow methods, which require an additional reference to the root view, whereas in your PR you call InputMethodManager.toggleSoftInput(), which does not need the view. Any advantage of one over the other?

[gunkiratk]

@codeanticode The only one advantage I found is showSoftInput() does not work when device has a hard (slide-out) keyboard whereas toggleSoftInput() works for every device.

[codeanticode]

@gunkiratk Great observation, removed old code and merged your PR. Thank you!

(please note that the current development branch is https://github.com/processing/processing-android/tree/wearapi, merged there)

[codeanticode]

@gunkiratk Actually, I just thought that if you have a hardware keyboard, you might not want the soft keyboard to open up, since you will be receiving the key events from hard keyboard anyways, wouldn't you agree?

[gunkiratk]

But I think we should give an option of softKeyboard to users with hardware keyboard ,just like laptops and PCs with hard keyboard have, because there can be possibility the hardware keyboard is not working or some keys are not functional then the user can use softKeyboard.So it is better to use toggleSoftInput() as it works with all devices.