Android:Cardview背景在4.1.2上变为黑色 [英] Android : Cardview Background is turning to black on 4.1.2

问题描述

我正在使用google cardView支持库来实现我的卡功能.它适用于kitkat和版本升级，但卡的背景设置为黑色，并且在设备4.1.2上未应用填充/边距.

I am using google cardView support library for my card functionality. It works well for kitkat and version up but however the background of card is set to black and padding/margins are not applied on device 4.1.2.

<android.support.v7.widget.CardView
        android:id="@+id/all_goals_card_view"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_marginRight="20dp"
        android:layout_marginLeft="20dp"
        android:layout_gravity="center"
        android:layout_marginTop="20dp"
        android:layout_marginBottom="20dp"
        android:padding="10dp"
        app:cardCornerRadius="4dp"
        card_view:cardPreventCornerOverlap="false"
        card_view:cardBackgroundColor="@android:color/white"
        >
 </android.support.v7.widget.CardView>

推荐答案

好吧，我偶然发现了同一个问题，发现某些设备具有特殊的"非常轻的，以咳嗽为主题的默认设置咳嗽三星咳嗽我会回答这个有点老的问题.

Okay, I just stumbled across the same issue and I found some devices to have some "special" very-light light-theming defaults cough samsung cough I will answer this slightly old queston.

这里的事情是，您很可能使用了错误的context来夸大您的布局.我认为您正在使用application-context来执行此操作. Application-Context不应用您定义的主题.

The thing here is that you are most likely using the wrong context to inflate you layout. I think you are using the application-context to do so. Application-Context does not apply the theme you defined.

此(在应用程序上下文中夸大)是合法的，但会导致通货膨胀 将使用您所在系统的默认主题来完成 正在运行，而不是您的应用程序中定义的内容.*

This (inflating with the application-context) is legal, but inflation will be done with the default theme for the system on which you are running, not what’s defined in your application.*

例如，如果您这样做:

LayoutInflater.from(context).inflate(R.layout.menu_rental_list_item, parent, false);

此处的context应该是Activity-或Fragment Context-而不是应用程序上下文.

The context here should be an Activity- or Fragment Context - NOT the application-context.

请仔细检查.

*)啊，您想了解更多有关上下文的信息吗?请继续在此处阅读.

*) Ah, you want to read more about contexts? Please continue reading here.

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