Custom TextSize of BottomNavigationView support android

Question

I am trying to change the textSize of BottomNavigationView from android support library 25.0.0

Answer 1

you can change it like this. you have to only khow the id of labels that google support used

BottomNavigationView bottomNavigationView = (BottomNavigationView) fragmentActivity.findViewById(R.id.bottom_navigation);
    TextView textView = (TextView) bottomNavigationView.findViewById(R.id.menu_item_home).findViewById(R.id.largeLabel);
    textView.setTextSize(8);

LargeLabel is the id of label that google used in its library

Answer 2

Unfortunately this first version of BottomNavigationView came with a lot of limitations. And for now you can't change titles size just using the support design API. So to solve this limitation while google doesn't implement it, you can do:

In your dimen.xml you can put:

    <dimen name="design_bottom_navigation_text_size" tools:override="true">30sp</dimen>
    <dimen name="design_bottom_navigation_active_text_size" tools:override="true">30sp</dimen>

Doing this you are overriding the default value of dimen that the internal classes of BottomNavigationView use. So be carreful.