只希望少数视图向上移动，而其他视图在键盘显示时固定为固定

Question

我在SO中给出了这么多答案，但仍然没有结果。我有这个xml：

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout
    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:background="#f3f3f3"
    android:layout_height="match_parent">
    <include layout="@layout/headerVw"
        android:layout_width="match_parent"
        android:layout_height="?android:attr/actionBarSize"
        android:id="@+id/headerVw"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"/>
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rvChatList"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:paddingBottom="@dimen/dimen_10dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/divider_vw">
    </android.support.v7.widget.RecyclerView>

    <!-- A horizontal line between the chatbox and RecyclerView -->
    <View
        android:id="@+id/divider_vw"
        android:layout_width="0dp"
        android:layout_height="1dp"
        android:background="#c7c7c7"
        android:layout_marginBottom="0dp"
        app:layout_constraintBottom_toTopOf="@+id/bottomLayout"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"/>

    <LinearLayout
        android:id="@+id/bottomLayout"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:minHeight="48dp"
        android:background="#ffffff"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toLeftOf="parent">

        <LinearLayout
            android:id="@+id/servicesLayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:visibility="gone"
            android:orientation="vertical">
        <android.support.v7.widget.RecyclerView
            android:id="@+id/rvServicesList"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
        </android.support.v7.widget.RecyclerView>

        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="#c7c7c7"/>
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
        <ImageView
            android:id="@+id/ivUpArrow"
            android:background="?attr/selectableItemBackground"
            android:clickable="true"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:src="@drawable/ic_uparrow"
            android:layout_gravity="bottom" />

        <View
            android:layout_width="1dp"
            android:layout_height="match_parent"
            android:background="#c7c7c7"
            android:layout_margin="@dimen/dimen_5dp"/>

        <EditText
            android:id="@+id/edittext"
            android:hint="@string/hi_how_can_i_help_you"
            android:background="@android:color/transparent"
            android:layout_gravity="center"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:textSize="@dimen/textSize_12sp"
            android:layout_height="wrap_content"
            android:maxLines="6"/>

        <ImageView
            android:id="@+id/btnSend"
            android:background="?attr/selectableItemBackground"
            android:clickable="true"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:padding="@dimen/dimen_10dp"
            android:src="@drawable/ic_send_icon"
            android:layout_gravity="bottom" />

        <View
            android:layout_width="1dp"
            android:layout_height="match_parent"
            android:background="#c7c7c7"
            android:layout_margin="@dimen/dimen_5dp"/>

        <ImageView
            android:id="@+id/ivMic"
            android:background="?attr/selectableItemBackground"
            android:clickable="true"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:padding="@dimen/dimen_10dp"
            android:src="@drawable/ic_mic_grey"
            android:layout_gravity="bottom" />

    </LinearLayout>
    </LinearLayout>

</android.support.constraint.ConstraintLayout>

这里我希望headerVw固定在顶部，而当edittext接收焦点并显示键盘时，回收站视图和bottomLayout向上移动。但是在给定xml的情况下，bottomLayout在键盘后面隐藏了一半，并且headerVw也正在滚动并隐藏当键盘处于打开状态时。 提前致谢！