如果布局中有两张卡片，则第二张卡片下方没有阴影/高度.为什么? [英] No shadow/elevation underneath second card if there are two card in the layout. Why?
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问题描述
我在一个 RelativeLayout 中有 2 个 cards.
I have 2 cards in a single RelativeLayout.
问题是第二张卡片下面没有高程或阴影.
The problem is that there is no elevation or shadow underneath the second card.
在此处查看屏幕截图:屏幕截图
这是我在 xml 文件中所做的:
Here's what I have done in the xml file:
<?xml version="1.0" encoding="utf-8"?>
<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:background="@color/colorPrimary"
xmlns:app="http://schemas.android.com/apk/res-auto"
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.abc.xyz.abcActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/cba_screen_text"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@string/cba_screen_text"
android:textColor="@android:color/white"
android:textSize="@dimen/cba_screen_text"
android:gravity="center_horizontal|center_vertical"
android:layout_gravity="center_horizontal|center_vertical"/>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/signup_screen_first_cardview_top_margin"
app:contentPadding="10dp"
app:cardBackgroundColor="@android:color/white">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal|center_vertical"
android:orientation="vertical">
<!-- N Label -->
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/abc_screen_name_label_topmargin">
<EditText android:id="@+id/input_n"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textCapWords"
android:textColor="@color/colorPrimary"
android:hint="N" />
</android.support.design.widget.TextInputLayout>
<!-- E Label -->
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/abc_screen_name_label_topmargin"
android:layout_marginBottom="@dimen/abc_screen_name_label_topmargin">
<EditText android:id="@+id/input_e"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textCapWords"
android:textColor="@color/colorPrimary"
android:hint="E" />
</android.support.design.widget.TextInputLayout>
<!-- P Label -->
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/abc_screen_name_label_topmargin"
android:layout_marginBottom="@dimen/abc_screen_name_label_topmargin">
<EditText android:id="@+id/input_p"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textCapWords"
android:textColor="@color/colorPrimary"
android:hint="P"/>
</android.support.design.widget.TextInputLayout>
<!-- S Button -->
<android.support.v7.widget.AppCompatButton
android:id="@+id/btn_s"
android:layout_width="@dimen/s_btn_width"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/c_btn_topmargin"
android:layout_gravity="center_horizontal"
android:padding="12dp"
android:text="C"
android:textSize="@dimen/s_btn_text_size"/>
<TextView android:id="@+id/l"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/a_topmargin"
android:text="A"
android:gravity="center"
android:textSize="16sp"/>
</LinearLayout>
</android.support.v7.widget.CardView>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:layout_gravity="center_horizontal|center_vertical"
android:text="OR"
android:textStyle="bold"
android:textSize="20sp"
android:textColor="@android:color/white"/>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentPadding="10dp"
app:cardElevation="2dp"
app:cardBackgroundColor="@android:color/white">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<com.google.android.gms.common.SignInButton
android:id="@+id/google_login_button"
android:layout_width="@dimen/sign_in_btn_width"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" />
<com.facebook.login.widget.LoginButton
android:id="@+id/facebook_login_button"
android:layout_width="@dimen/sign_in_btn_width"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_gravity="center_horizontal" />
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</RelativeLayout>
请告诉我为什么会发生这种情况，以及如何在第二张卡片下方也显示阴影/高度?
Please let me know why is this happening and how can I have the shadow/elevation underneath the second card too?
推荐答案
你的 LinearLayout 正在包裹它的高度，切断底部卡片的阴影.
Your LinearLayout is wrapping its height, cutting off the shadow of the card at the bottom.
要么在 LinearLayout 的底部放置一些填充，要么将其设置为 match_parent 的高度.
Either put some padding on the bottom of the LinearLayout or set it to match_parent on its height.
PS外面的RelativeLayout没用——去掉它，把所有的内边距和背景放在里面的LinearLayout上
PS that outer RelativeLayout is useless -- get rid of it and put all the padding and background on the inner LinearLayout
这篇关于如果布局中有两张卡片，则第二张卡片下方没有阴影/高度.为什么?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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