It was a bit tricky. I used the following code and it worked for me.
for (int i = 0; i < tabhost.getTabWidget().getChildCount(); i++) {
final TextView tv = (TextView) tabhost.getTabWidget().getChildAt(i)
.findViewById(android.R.id.title);
// Look for the title view to ensure this is an indicator and not a divider.(I didn't know, it would return divider too, so I was getting an NPE)
if (tv == null)
continue;
else
tv.setTextColor(0xFFFFFFFF);
}