CardView 不显示阴影高度 [英] CardView not showing shadow elevation
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问题描述
我正在使用 cardviews，但问题是我的 CardView 没有显示任何高度或阴影.我已经尝试过 stackoverflow 答案中建议的一些方法，就像我尝试过使用高程和阴影属性一样.我也尝试过使用 card_view:cardUseCompatPadding="true"，但没有成功.这是我的xml文件
I am working with cardviews but the problem is my CardView is not showing any elevation or shadow. I have already tried some of the methods suggested in stackoverflow answers like I have tried using elevation and shadow property. I have also tried using card_view:cardUseCompatPadding="true", but without any success. This is my xml file
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
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"
xmlns:card_view="http://schemas.android.com/tools"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:layout_marginTop="6dp"
android:layout_marginBottom="6dp"
app:cardBackgroundColor="#FAFBFD"
app:cardElevation="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/post_profile_image"
android:layout_width="50dp"
android:layout_height="50dp"
android:src="@mipmap/ic_launcher"
android:layout_marginLeft="12dp"
android:layout_marginTop="12dp"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/post_profile_image"
android:layout_marginLeft="12dp"
android:orientation="vertical"
android:layout_marginTop="16dp">
<TextView
android:id="@+id/post_username"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Name"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#000000"/>
<TextView
android:id="@+id/post_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:text="Time"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/grayColor"/>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:drawable/ic_delete"
android:id="@+id/post_delete_btn"
android:visibility="invisible"/>
</LinearLayout>
</RelativeLayout>
<ImageView
android:id="@+id/post_image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="12dp"
android:adjustViewBounds="true"
android:background="#00ffffff"
android:src="@drawable/add_btn"
android:visibility="gone"/>
<TextView
android:id="@+id/post_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:layout_marginLeft="12dp"
android:text="Text about Posting...."
android:textAppearance="?android:attr/textAppearanceMedium"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:layout_marginBottom="8dp">
<ImageButton
android:id="@+id/like_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="12dp"
android:background="#00ffffff"
android:src="@drawable/grey_like_bt"/>
<TextView
android:id="@+id/post_like_count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="4dp"
android:layout_marginTop="8dp"
android:text="0 Likes"
android:textColor="#2196F3"/>
<ImageButton
android:id="@+id/comment_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="32dp"
android:background="#00ffffff"
android:src="@drawable/comment_btn_gray"/>
<TextView
android:id="@+id/post_comment_count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="4dp"
android:layout_marginTop="8dp"
android:text="0 Comments"
android:textColor="#2196F3"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:drawable/ic_menu_edit"
android:visibility="invisible"
android:id="@+id/post_edit_btn"
android:layout_alignParentRight="true"/>
</RelativeLayout>
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
不知道为什么它没有显示任何高度和阴影
Dont know why it is not showing any elevation and shadow
推荐答案
别忘了画阴影必须使用硬件加速绘图
Do not forget that to draw shadow you must use hardwareAccelerated drawing
<application android:hardwareAccelerated="true" ...>
查看详情https://developer.android.com/guide/topics/graphics/hardware-accel.html?hl=ru
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