How to change selected tab title textSize in Android

Question

I am trying to find a way to change text size of Tab Title when selected. Until now without exit. Hope someone can help me.

My code bellow:

XML

Answer 1

I would recommend to set custom tab.

First you need to initiate your custom tabs, otherwise it won't change anything.

1. Create a new layout with a TextView (you can add whatever you want to be in each tab).

2. In your onActivityCreated after your tabLayout.setupWithViewPager initiate your custom tabs:

   for (int i = 0; i < 3; i++) { // 3 - A+B+C in your example
       TabLayout.Tab tab = tabLayout.getTabAt(i);
       if (tab != null) {
           ViewGroup tabContainer = (ViewGroup) LayoutInflater.from(this).inflate(R.layout.custom_tab_item, tabLayout, false);
           if (tabContainer != null) {
               TextView yourTv = (TextView) tabContainer.findViewById(R.id.tv); 
               yourTv.setTextSize(18);
               tab.setCustomView(tabContainer);
           }
       }
   }
   

3. Add listener tabLayout.addOnTabSelectedListener and Implement TabLayout.OnTabSelectedListener, In your onTabSelected use this:

   for (int i = 0; i < tabLayout.getTabCount(); i++) {
       TabLayout.Tab tab = tabLayout.getTabAt(i);
       if (tab != null) {
           View customView = tab.getCustomView();
           if (customView != null) {
               TextView yourTv = (TextView) customView.findViewById(R.id.tv);
               if (yourTv != null) {
                   if (i == selectedTabIndex) {
                       yourTv.setTextSize(18);
                   } else {
                       yourTv.setTextSize(16);
                   }
               }
           }
       }
   }