I'm using a tablet with Android 2.2. Is there something like Tab to switch to the next form field?
Do you mean with an external keyboard or the on-screen keyboard?
With the on-screen keyboard, usually the
<Enter> key turns into a
<Next> key (looks like a right arrow) when there is another field after the current one. At least, this seems to be how most apps on Android work.
Sometimes it doesn't change functionality; this happens most often in web forms where the enter key is a valid input.