Layout Issues

layout.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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:id="@+id/relative"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:id="@+id/linear"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/default_gap"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/input"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="15dp"
            android:layout_weight="1"
            android:ems="10"
            android:focusable="true"
            android:focusableInTouchMode="true"
            android:focusedByDefault="true"
            android:hint="@string/input_a_number"
            android:imeOptions="actionDone|flagNoPersonalizedLearning"
            android:importantForAutofill="no"
            android:inputType="numberSigned|numberDecimal"
            android:maxLength="30"
            android:maxLines="1"
            android:singleLine="true"
            tools:ignore="LabelFor"
            tools:targetApi="o" />

        <Spinner
            android:id="@+id/spinner"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="@dimen/default_gap"
            android:layout_weight="1"
            android:minWidth="180dp" />
    </LinearLayout>

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/linear"
        android:layout_marginStart="5dp"
        android:layout_marginTop="5dp"
        android:layout_marginEnd="10dp" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:layout_gravity="bottom|end"
        android:layout_margin="16dp"
        android:visibility="gone"
        app:backgroundTint="@color/jade_fab"
        app:elevation="4dp"
        app:srcCompat="@drawable/jade" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>