问Android -以碎片形式显示屏幕外的按钮

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<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"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.jovensprofissionais.breakfastitismytreat.fragments.PersonFragment">
<TextView
    android:id="@+id/personOfTheNextWeekTitle"
    android:layout_toStartOf="@+id/personOfTheNextWeek"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/person_of_the_next_week_title" />

<TextView
    android:id="@+id/personOfTheNextWeek"
    android:layout_alignParentEnd="true"
    android:layout_alignParentTop="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/person_of_the_next_week" />

<TextView
    android:id="@+id/personOfTheWeekTitle"
    android:textSize="25sp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/person_of_the_week_title"
    android:layout_above="@+id/personOfTheWeek"
    android:layout_centerHorizontal="true" />

<TextView
    android:id="@+id/personOfTheWeek"
    android:textSize="45sp"
    android:textColor="@color/colorPrimary"
    android:layout_centerVertical="true"
    android:layout_centerHorizontal="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/person_of_the_week" />

<RatingBar
    android:id="@+id/ratingBar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:numStars="5"
    android:stepSize="1.0"
    android:layout_above="@+id/voteButton"
    android:layout_centerHorizontal="true"
    android:theme="@style/RatingBar"/>

<Button android:id="@+id/voteButton"
    android:text="@string/text_to_button_view"
    android:textColor="@color/colorPrimaryDark"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/colorAccent"
    android:gravity="center"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true" />

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    app:layout_scrollFlags="scroll|enterAlways"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

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

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