★ setBackground vs setBackgroundDrawable / AlertDialog

It's deprecated but it still works so you could just use it. But if you want to be completly correct, just for the completeness of it... You'd do something like following:

int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.JELLY_BEAN) {
    setBackgroundDrawable();
} else {
    setBackground();
}

if (Build.VERSION.SDK_INT > 10)
    builder =  new AlertDialog.Builder(getActivity(), R.style.Theme.Sherlock.Dialog);
else
    builder =  new AlertDialog.Builder(getActivity());