Android CardView在Api 21上不起作用 [英] Android CardView doesn't work on Api 21

问题描述

我使用的是android CardView，它在Api 21下可以完美运行.但是，当我在Api 21上使用它时，即棒棒糖，cardElevation之类的xml属性不起作用.我在做什么错了?

I am using android CardView and it works perfectly below Api 21. But when I use it on Api 21 i.e. Lollipop the xml attributes like cardElevation, cornerRadius doesn't work. What am I doing wrong?

这是我的XML布局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <!-- A CardView that contains a TextView -->
    <android.support.v7.widget.CardView
        android:id="@+id/card_view"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        card_view:cardElevation="2dp"
        card_view:cardBackgroundColor="@color/white"
        card_view:cardCornerRadius="4dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingTop="6dp"
            android:paddingBottom="8dp"
            android:paddingLeft="8dp"
            android:paddingRight="8dp"
            android:background="@color/white"
            android:layout_gravity="center_vertical"
            android:gravity="center_vertical"
            android:layout_alignBottom="@+id/live_image">

            <TextView
                android:id="@+id/title_update"
                android:text="@string/msg_error"
                android:layout_width="match_parent"
                android:singleLine="true"
                android:ellipsize="end"
                android:textSize="18sp"
                android:background="@color/white"
                android:textColor="@color/black"
                android:layout_height="wrap_content" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal">

                <TextView
                    android:id="@+id/textView_time"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:text="@string/msg_error"
                    android:layout_weight="0.75"
                    android:singleLine="true"
                    android:ellipsize="end"
                    android:textAppearance="?android:attr/textAppearanceSmall"
                    android:textColor="@color/black_translucent" />

                <TextView
                    android:id="@+id/textViewAlarm"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.25"
                    android:visibility="gone"
                    android:textAppearance="?android:attr/textAppearanceSmall"
                    android:textColor="@color/black"
                    android:textStyle="italic" />
            </LinearLayout>
        </LinearLayout>

    </android.support.v7.widget.CardView>
</LinearLayout>

推荐答案

我在CardView上遇到了完全相同的问题.将compatPadding设置为true可以解决此问题.

I had exactly the same problem with CardView. Setting compatPadding to true fixed the issue.

在您的布局中，尝试将以下行添加到您的CardView

In your layout try to add the following line to your CardView

card_view:cardUseCompatPadding="true"

或者，如果您要初始化代码，请使用

Or if you are initializing in code, use

cardView.setUseCompatPadding(true);

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