Tabs not scrolled on init on support library 23.3.0

[nshmura]

Tabs not scrolled on init on support library 23.3.0

[nshmura]

Hi @gregacucnik ,
Thank you for your reporting!
I'll check this issue, please wait.

[nshmura]

@gregacucnik
Sadly enough, I can't reproduce this bug.
Would you please tell me the program that reproduces this bug?

[gregacucnik]

This occurs on Nexus 5 running Marshmallow 6.0.1 (and 6.0). I tried old Samsung S3 with 4.3 and it works correctly.

In Activity onCreate i set RecyclerTabLayout with custom adapter and current item is in the middle of all possible items (51 items, the middle one is 25).

[nshmura]

@gregacucnik Sorry for late response. I still can't reproduce this bug.
Is it possible that you show the source code ?

[gregacucnik]

I cant send you the source code because its part of a massive project.
Im trying to alter your demo to get the bug to occur but i also cant do it.

I can give your more directions:

• im using Fragments with an custom FragmentStatePagerAdapter
• i use setupWithAdapter method
• after everything is initialized i set current item to the middle (something like your demo Years)
• Tab Layout scroll is disabled
• In the onCreateViewHolder i alter each item width in order to set have specific number of items visible in the Tab Layout

I found that the problem is in the onCreateViewHolder where i change the item width. If i remove this code Tab Layout is scrolled correctly (setAutoMeasureEnabled is also removed). However it doesnt happen in your demo.

Here is the approximate code:

 @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.layout_custom_view01_tab, parent, false);

        ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
        layoutParams.width = parent.getWidth() / 3;

        view.setLayoutParams(layoutParams);

        return new ViewHolder(view);
    }

Currently, I dont have time to investigate why this happens. It seems that is has something to do with measuring layout (maybe also connected with fragments).

[nshmura]

@gregacucnik Thank you for your detailed information!

[nshmura]

I can't reproduce with support library 26.0.1 on Nexus 5 running Marshmallow 6.0.1.

If you have had this issue yet, please open this issue again.