// Calculate default ActionBar height
TypedValue tv = new TypedValue();
if (getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)){
    actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data,getResources().getDisplayMetrics());
}


// Height of an instance.
// NOTE: Only works on the ActionBar/Toolbar instance
actionBar.getHeight();