如何在滚动视图顶部添加浮动操作按钮 [英] How to add floating action button on top of scrollview
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问题描述
我有一个浮动操作按钮，我想将其添加到滚动视图的顶部，以便即使您滚动也可以保留该按钮.我希望它在滚动视图的顶部和屏幕的右下角.我需要使用哪种视图组合来完成此任务?
I have a floating action button that I would like to add on top of a scrollview so that the button stays, even if you scroll. I want it on the top of the scrollview and in the bottom right corner of the screen. What combination of views do I need to use to accomplish this?
这是xml文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:fab="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.nhscoding.safe2tell.STORIES"
android:background="@color/stor_back">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom"
>
<com.getbase.floatingactionbutton.FloatingActionButton
android:id="@+id/pink_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
fab:fab_icon="@drawable/ic_add"
fab:fab_colorNormal="@color/fab_back"
fab:fab_colorPressed="@color/fab_pressed_back"
android:layout_gravity="end"
android:layout_marginBottom="16dp"
android:layout_marginRight="16dp"/>
</LinearLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view1"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="@dimen/card_margin_top"
android:layout_marginBottom="@dimen/card_margin_bottom"
android:layout_marginLeft="@dimen/card_margin_left"
android:layout_marginRight="@dimen/card_margin_right"
card_view:cardCornerRadius="@dimen/card_radius"
>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/card_title_top"
android:layout_marginBottom="@dimen/card_title_bottom"
android:layout_marginLeft="@dimen/card_title_left"
android:layout_marginRight="@dimen/card_title_right"
android:text="@string/card1_title"
android:textSize="@dimen/card_title_size"
android:gravity="top"
android:id="@+id/title1"
/>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view2"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="@dimen/card_margin_top"
android:layout_marginBottom="@dimen/card_margin_bottom"
android:layout_marginLeft="@dimen/card_margin_left"
android:layout_marginRight="@dimen/card_margin_right"
card_view:cardCornerRadius="@dimen/card_radius"
android:layout_below="@id/card_view1">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/card_title_top"
android:layout_marginBottom="@dimen/card_title_bottom"
android:layout_marginLeft="@dimen/card_title_left"
android:layout_marginRight="@dimen/card_title_right"
android:text="@string/card2_title"
android:textSize="@dimen/card_title_size"
android:gravity="top"
/>
<TextView
android:id="@+id/info_text2"
android:layout_marginTop="16dp"
android:layout_marginBottom="0dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view3"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="@dimen/card_margin_top"
android:layout_marginBottom="@dimen/card_margin_bottom"
android:layout_marginLeft="@dimen/card_margin_left"
android:layout_marginRight="@dimen/card_margin_right"
card_view:cardCornerRadius="@dimen/card_radius"
android:layout_below="@id/card_view2">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/card_title_top"
android:layout_marginBottom="@dimen/card_title_bottom"
android:layout_marginLeft="@dimen/card_title_left"
android:layout_marginRight="@dimen/card_title_right"
android:text="@string/card3_title"
android:textSize="@dimen/card_title_size"
android:gravity="top"
/>
<TextView
android:id="@+id/info_text3"
android:layout_marginTop="16dp"
android:layout_marginBottom="0dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view1"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="@dimen/card_margin_top"
android:layout_marginBottom="@dimen/card_margin_bottom"
android:layout_marginLeft="@dimen/card_margin_left"
android:layout_marginRight="@dimen/card_margin_right"
card_view:cardCornerRadius="@dimen/card_radius">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/card_title_top"
android:layout_marginBottom="@dimen/card_title_bottom"
android:layout_marginLeft="@dimen/card_title_left"
android:layout_marginRight="@dimen/card_title_right"
android:text="@string/card4_title"
android:textSize="@dimen/card_title_size"
android:gravity="top"
android:id="@+id/title4"
/>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view1"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="@dimen/card_margin_top"
android:layout_marginBottom="16dp"
android:layout_marginLeft="@dimen/card_margin_left"
android:layout_marginRight="@dimen/card_margin_right"
card_view:cardCornerRadius="@dimen/card_radius">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/card_title_top"
android:layout_marginBottom="@dimen/card_title_bottom"
android:layout_marginLeft="@dimen/card_title_left"
android:layout_marginRight="@dimen/card_title_right"
android:text="@string/card5_title"
android:textSize="@dimen/card_title_size"
android:gravity="top"
android:id="@+id/title5"
/>
</android.support.v7.widget.CardView>
</LinearLayout>
</ScrollView>
</RelativeLayout>
推荐答案
RelativeLayout中的较早子项倾向于漂浮在RelativeLayout中的较早子项之上.
Later children in a RelativeLayout tend to float over earlier children in a RelativeLayout.
(我之所以说倾向于"，是因为Android 5.0的elevation东西也起着作用，而且它们之间的关系定义不明确)
(I say "tend to" because Android 5.0's elevation stuff also plays a role, and the relationship between them is ill-defined)
因此，要使浮动操作按钮(FAB)悬浮在RelativeLayout中的ScrollView上方，请确保先在XML中定义ScrollView，然后再定义FAB.这不会影响X/Y规则，但是应该使FAB出现在Z轴的ScrollView上.
So, to have a floating action button (FAB) float over a ScrollView in a RelativeLayout, make sure that the ScrollView is defined first in the XML, with the FAB after it. This will not affect the X/Y rules, but it should have the FAB appear over the ScrollView on the Z axis.
如果您仅支持Android 5.0+，则另一种可能性是使用android:elevation本身来提高FAB.
Another possibility, if you are only supporting Android 5.0+, would be to use android:elevation itself to raise the FAB.
这篇关于如何在滚动视图顶部添加浮动操作按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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