set typeface of text view to Typeface.NORMAL doesn't have any effect, why?

Question

I have listeners for ExpandableListView for group collapsed and expanded:

// There is a text view on group layout, no problem there.
    @Override
    public void onGroupCollapse(int groupPosition) {
        // this callback is triggered, however, once the textView is BOLD by onGroupExpanded, the textView is not set back to normal, seems this line of code does nothing...WHY?
        textView.setTypeface(textView.getTypeface(), Typeface.NORMAL);
    }

    @Override
    public void onGroupExpand(int groupPosition) {
        // it works fine
        textView.setTypeface(textView.getTypeface(), Typeface.BOLD);
    }

As you can see above, I have a textView in group layout, when group is expanded, I bold the textView, if collapsed, I try to set it back to unbold by Typeface.NORMAL.

Both callbacks are triggered correctly, however, once the textView is BOLD by onGroupExpanded(...) callback, the textView is not set back to NORMAL when onGroupCollapse(...) is triggered afterwards. Seems the line of code in onGroupCollapsed(...)does nothing...WHY?

(Again, onGroupCollapse(...) is triggered. No problem there!)

Philcox

try textView.setTypeface(null, Typeface.NORMAL); how does it look? – Arteriole

@donfuxx, It works now after I did the change you suggested. But could you please also explain why my code has that issue? why use null as the first parameter solves the issue? – Philcox

I tried to explain in my answer ;-) I know the setTypeface method is not really intuitive and confuses myself from time to time :-P – Arteriole

Answer 1

Use this instead:

textView.setTypeface(null, Typeface.NORMAL);

you need to put null to drop the other typefaces (in your case Bold). How I understand it one text view can have multiple typesfaces, like for example italic+bold etc. and the first parameter is to indicate if you want to keep those or not. So basically your previous code kept BOLD and added NORMAL, and BOLD won ;-)

see also related answer and comments here https://mcmap.net/q/53311/-how-to-set-textview-textstyle-such-as-bold-italic

Arteriole

Honest...Thanks for the ref. – Diaspore

it will work but will reset text appearance (font family and so on) – Electrometer

Answer 2

If you use android:fontFamily on this TextView then I am pretty sure

textView.setTypeface(null, Typeface.NORMAL);

will change to the default font. Another way to do this is:

textView.setTypeface(Typeface.create(textView.getTypeface(), Typeface.NORMAL));

The original problem is that TextView's setTypeface with the style oddly skips over some stuff if the style is NORMAL. I've tested this on one version, and it works.

Eliciaelicit

Yes, you are right. That should be the accepted answer. – Sangraal

won't be able to set NORMAL after ITALIC or BOLD – Electrometer