Android move footer up when keyboard is open

I'm designing a login html page which is loaded into an Android WebView. There are two text areas and a "Login" button fixed to the bottom of the page. My problem is that when the person types into the text area; the keyboard pops up and hides the login button.

How can I keep the "Login" button fixed to the bottom of the page but to the top of the keyboard?

I've tried :

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_PAN);

And

android:windowSoftInputMode="adjustPan|adjustResize"

Neither makes a difference.