When switch / replace a fragment, the keyboard normally does not dismiss itself. Here is a quick way to ensure keyboard dismissed after the fragment replace (Leaving the fragment).

Utility Function

First, you will need a utility function to dismiss keyboard.

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class KeyboardUtil {
    companion object {
        /**
         * Call this function to dismiss the keyboard.
         * @param activity: Pass in the current activity as context and get the current focus window.
         */
        fun dismiss(activity: Activity)  {
            val imm: InputMethodManager = activity.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
            activity.currentFocus?.let { focus ->
                imm.hideSoftInputFromWindow(focus.windowToken, 0)
            }
        }
    }
}

Now you can call this function anywhere and pass in the current activity to easily dismiss keyboard.

Question is where do you call this utility function?

In Fragment

You want to call this utility function in fragment onPause life cycle.

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@Override
public void onPause() {
    super.onPause();
    assert getActivity() != null;
    KeyboardUtil.Companion.dismiss(getActivity());
}

Note that when you deactivate the app (moving to background), the keyboard will dismiss too. This is because the onPause is called when app into background as well.