How to disable scrolling ViewPager while keyboard is shown?

Question

I'm developing an app and use ViewPager inside it. It scrolls fragments, one of which contains the text input field. So the problem is the following: while the keyboard is showing I still can scroll fragments. have anybody met the same problem?

This is my Main Activity code:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/activity_main"
    tools:context=".activities.MainActivity">

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/navigation"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="?android:attr/windowBackground"
        app:itemBackground="@color/bgBottomNavigation"
        android:foreground="?attr/selectableItemBackground"
        app:itemIconTint="@android:color/white"
        app:itemTextColor="@android:color/white"
        app:menu="@menu/navigation" />

</RelativeLayout>

And this is the fragment code:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.Login">

<ImageView
    android:id="@+id/loginLogo"
    android:layout_width="match_parent"
    android:layout_height="300dp"
    android:src="@mipmap/logo_foreground"
    tools:ignore="ContentDescription" />

<EditText
    android:id="@+id/loginUsername"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ems="15"
    android:inputType="textPersonName"
    android:layout_margin="10dp"
    android:layout_below="@+id/loginLogo"
    android:layout_centerHorizontal="true"/>

<EditText
    android:id="@+id/loginPassword"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:ems="15"
    android:inputType="textPassword"
    android:layout_margin="10dp"
    android:layout_below="@+id/loginUsername"
    android:layout_centerHorizontal="true"/>

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@id/loginPassword"
    android:layout_centerHorizontal="true"
    android:layout_margin="10dp"
    android:text="Войти" />

Answer 1

Well, the problem was solved the next way: I just created a little function to hide the keyboard

 public static void hideKeyboard(Activity activity) {
    InputMethodManager imm = (InputMethodManager) activity.getSystemService(Activity.INPUT_METHOD_SERVICE);
    //Find the currently focused view, so we can grab the correct window token from it.
    View view = activity.getCurrentFocus();
    //If no view currently has focus, create a new one, just so we can grab a window token from it
    if (view == null) {
        view = new View(activity);
    }
    imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}

And then used the listener of ViewPager:

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            hideKeyboard(activity);
        }

        @Override
        public void onPageSelected(int position) {
            if (prevMenuItem != null)
                prevMenuItem.setChecked(false);
            else
                 navigation.getMenu().getItem(0).setChecked(false);

            navigation.getMenu().getItem(position).setChecked(true);
            prevMenuItem = navigation.getMenu().getItem(position);
        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });