回收站视图和协调器布局上的奇怪行为

Question

我在CoordinatorLayout中使用了RecyclerView，就像这样

    <?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="56dp"
            android:theme="@style/AppTheme.AppBarOverlay">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                android:gravity="center_vertical">
            </android.support.v7.widget.Toolbar>
        </android.support.design.widget.AppBarLayout>

        <android.support.design.widget.TextInputLayout
            android:id="@+id/txtLayoutInvestment"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="16dp"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp">

            <android.support.design.widget.TextInputEditText
                android:id="@+id/investmentAmount"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="@string/inputProjectInvestmentHint"
                android:inputType="number"/>
        </android.support.design.widget.TextInputLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_marginEnd="16dp"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:layout_weight="1"
            android:orientation="vertical">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:layout_weight="1"
                    android:text="@string/loanList"
                    android:textSize="20sp"/>

                <ImageButton
                    android:id="@+id/btAddLoan"
                    style="@style/Base.Widget.AppCompat.Button.Borderless"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="end"
                    android:src="@android:drawable/ic_input_add"/>
            </LinearLayout>

            <android.support.v7.widget.RecyclerView
                android:id="@+id/loanList"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scrollbars="vertical">
            </android.support.v7.widget.RecyclerView>

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="52dp"
            android:layout_marginBottom="16dp"
            android:focusable="false"
            android:gravity="center_horizontal|bottom">

            <Button
                android:id="@+id/btBack"
                style="?android:borderlessButtonStyle"
                android:layout_width="80dp"
                android:layout_height="48dp"
                android:layout_marginEnd="8dp"
                android:text="@string/back_button"
                android:textColor="@color/colorAccent"/>

            <Button
                android:id="@+id/btCancel"
                style="?android:borderlessButtonStyle"
                android:layout_width="80dp"
                android:layout_height="48dp"
                android:layout_marginEnd="8dp"
                android:text="@string/cancel_button"
                android:textColor="@color/colorAccent"/>

            <Button
                android:id="@+id/btNext"
                style="?android:borderlessButtonStyle"
                android:layout_width="80dp"
                android:layout_height="48dp"
                android:layout_marginEnd="8dp"
                android:text="@string/next_button"
                android:textColor="@color/colorAccent"/>
        </LinearLayout>
    </LinearLayout>
</android.support.design.widget.CoordinatorLayout>

一切正常，直到我在editText上方输入内容并在键盘上触摸

我猜这是由协调器布局或recyclerview行为的配置引起的，但我不知道要修复它。请帮忙

* 170418更新：如果在按下主页按钮后返回应用程序，则显示正常。