New to RxJava/RxAndroid and am finding the lack of examples disturbing. As a way to jump into using Rx, id like to try to get something small working. Basically, if an `EditText` has text entered into it, then enable a `Button` below it.

I came across [this](https://stackoverflow.com/questions/32263773/rxjava-rxandroid-handle-multiple-edittext-changes) answer, but the authors edit doesnt really show how to completely implement something like this.

From what I've gathered, I can use [RxBindings](https://github.com/JakeWharton/RxBinding) to create an `Observable` like:

```
Observable<CharSequence> observable = RxTextView.textChanges(mEditText);

```

Supposedly I would now need to `.subcribe()` an `Observer` to watch for changes in `observable`, but am unsure how this would be done.

Also, how would you create the EditTexts Observable without using RxBindings if needed?

**Edit:** Although [Retrolambda](https://github.com/evant/gradle-retrolambda) exists, answers showing how to implement this without lambdas (or both) would be helpful.