Android 自定义视图未在活动中完全显示

我正试图从这里显示“空间导航视图”

我面临的问题是，视图完全出现在简单活动中，而不是包含协调器布局的主活动中

这是我主要活动的xml，结果如下

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
android:id="@+id/main_content"

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:animateLayoutChanges="true"                                                  
android:fitsSystemWindows="true"                                                 
tools:context="com.rvnd.bookshare.Strt">

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:animateLayoutChanges="false"
    android:background="@color/background"
    android:paddingTop="@dimen/appbar_padding_top"
    app:elevation="0dp"
    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="@color/transparent"

        app:popupTheme="@style/AppTheme.PopupOverlay">
        <TextView
            android:text="Book Share"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fontFamily="cursive"
            android:textSize="27sp"
            android:textColor="@color/text"/>


    </android.support.v7.widget.Toolbar>

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabGravity="fill"

 app:tabTextAppearance="@android:style/TextAppearance.Widget.TabWidget"
        />
    <TextView
        android:id="@+id/status"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:elevation="5dp"
        android:textColor="#000000"
        android:background="#FFD54F"
        android:gravity="center"
        android:padding="5dp"
        android:layout_gravity="top|center"
        android:visibility="gone"
        android:text="Syncing..."
        android:textAppearance="?android:attr/textAppearanceMedium"/>

</android.support.design.widget.AppBarLayout>



<android.support.v4.view.ViewPager
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

<com.luseen.spacenavigation.SpaceNavigationView
    android:id="@+id/space"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:space_background_color="@color/colorPrimary"
    android:layout_gravity="bottom"
    android:background="@color/colorPrimary"



 app:layout_behavior="com.luseen.spacenavigation.SpaceNavigationViewBehavior"/>

        />
<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="end|bottom"
    android:layout_margin="@dimen/fab_margin"
    android:visibility="gone"
    app:srcCompat="@drawable/booky"/>

</android.support.design.widget.CoordinatorLayout>

另一方面，如果我在另一个更简单的活动中使用相同的视图，则视图会正确呈现

下面是代码，下面是它的实际外观

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


 android:id="@+id/activity_history"
    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="com.rvnd.bookshare.History"
    android:orientation="vertical"
    xmlns:app="http://schemas.android.com/apk/res-auto">

<LinearLayout
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:gravity="center"
    android:background="@color/skyblue"

    android:layout_height="40dp">


<TextView
    android:text="All your book transfers are recorded here..."
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:id="@+id/status"
    android:textColor="#ffffff"
    android:gravity="center"
    android:layout_weight="1"
    android:textSize="13sp"/>

    <Button
        android:text="Clear history"
        android:layout_height="match_parent"
        android:id="@+id/clear"
        android:textAllCaps="false"

        android:layout_width="98dp"
        android:textSize="12sp"/>
</LinearLayout>

<android.support.v7.widget.RecyclerView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/rec"/>


<com.luseen.spacenavigation.SpaceNavigationView
    android:id="@+id/space"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:space_background_color="@color/colorPrimary"
    android:background="@color/colorPrimary"
    android:layout_gravity="bottom"



app:layout_behavior="com.luseen.spacenavigation.SpaceNavigationViewBehavior"/>
    </LinearLayout>



我已经尝试了所有的方法，但都无法正常显示，请帮忙！
谢谢
删除不起作用的浮动按钮代码：\