Zoom in out TextView within Scrollview in Fragment Android Studio

Since many days, I’m searching on Internet esp. on StackOverflow got many example code but failed to implement in my app (Fragment).

I have 2 Long TextViews in Scroll-view. I want to increase/decrease (zoom in/out) font size of all textviews on two finger touch (pinch). I need code for Fragment not for Activity.

Hoping for prompt and quick response from kind developers, Thanks a lot in advance

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