如何防止FAB在Android中使用CoordinateLayout滚动

Question

我的活动

下面是布局xml

<android.support.design.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:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="@color/white"
     android:fitsSystemWindows="true"
     tools:context=".HomeActivity">

     <android.support.design.widget.AppBarLayout
          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="wrap_content"
          android:theme="@style/AppTheme.Dark.AppBarOverlay"
          app:elevation="0dp">

          <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/AppTheme.Dark.PopupOverlay">
     </android.support.design.widget.AppBarLayout>

     <RelativeLayout
        android:id="@+id/rl_updates"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/ll_footer"
        android:layout_below="@+id/ll_fibres_search">

        <android.support.v4.widget.SwipeRefreshLayout
              android:id="@+id/srl_updates"
              android:layout_width="match_parent"
              android:layout_height="match_parent">

               <android.support.v7.widget.RecyclerView
                     android:id="@+id/rv_all_requirements"
                     android:layout_width="match_parent"
                     android:layout_height="match_parent"
                     android:divider="@color/iron"
                     android:dividerHeight="1px"/>
         </android.support.v4.widget.SwipeRefreshLayout>

         <android.support.design.widget.FloatingActionButton
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_alignParentBottom="true"
              android:layout_alignParentEnd="true"
              android:layout_alignParentRight="true"
              android:layout_marginBottom="@dimen/activity_horizontal_margin"
              android:layout_marginEnd="@dimen/activity_horizontal_margin"
              android:layout_marginRight="@dimen/activity_horizontal_margin"
              android:onClick="onRequirement"
              android:overScrollMode="never"
              android:src="@drawable/ic_playlist_add_white_24dp"
              app:backgroundTint="@color/pink"/>
    </RelativeLayout>
</android.support.design.widget.CoordinatorLayout>

当我滚动Recycler View时，App Bar就像我想要的那样折叠。但问题是FAB也向下移动了一点。我将16dp边距设置在底部，但它会粘在屏幕的底部。

如何阻止FAB最初向下移动？

这就是它现在的样子

Answer 1

您是否尝试在FloatingActionButton之外和RelativeLayout内取得CoordinatorLayout？你可以这样做并给它属性：

    android:layout_gravity="bottom|right|end"

而不是：

    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentRight="true"

Answer 2

为FAB按钮设置锚点

应用程式：layout_anchorGravity =＆＃34;底部|右|端＆＃34;  机器人：layout_gravity =＆＃34;右＆＃34;

Answer 3

将RelativeLayout替换为FrameLayout，并将此行添加到您的FAB

<强>机器人：layout_gravity = “右|底部”

像这样

<FrameLayout 
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/srl_updates"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/rv_all_requirements"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
 android:divider="@color/iron"
            android:dividerHeight="1px"/>
    </android.support.v4.widget.SwipeRefreshLayout>

    <android.support.design.widget.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/activity_horizontal_margin"
        android:layout_marginEnd="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"
        android:onClick="onRequirement"
        android:layout_gravity="right|bottom"
        android:overScrollMode="never"
        android:src="@drawable/ic_playlist_add_white_24dp"
        app:backgroundTint="@color/pink"/>

</FrameLayout>