Hide / disable microphone option on the Android soft keyboard

I want to hide the microphone in front of the soft keyboard in my current application.

I've tried these possible solutions for the same thing.

Disable the speech-text (micro-phone) key on the keyboard with the soft entry in Android programmatically

However, this solution does not work at all.

I found an unexpected thing when addType = "textFilter" is added, then it works for me, I mean, the microphone is hidden.

But if possible, I would like to have the exact solution to the problem, because if I take over the mentioned "textFilter" thing, it can break down later.

I tried it on below. versions

  1. Pie (API-28), device – Pixel2XL
  2. Marshmallow (API-23), Device – MotoE3Power