CardView-Android 的透明背景

我想在 CardView 上做透明的背景。 我知道背景颜色，但我有我的布局图像。

你知道怎么做吗? 或者什么工作作为卡德维尔，但我会设置一个透明的背景？

问候

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最佳答案

Setup your CardView to use the cardBackgroundColor attribute to remove color and cardElevation attribute to remove the drop shadow. For example:

<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/myCardView"
android:layout_width="match_parent"
android:layout_height="match_parent"
card_view:cardBackgroundColor="@android:color/transparent"
card_view:cardElevation="0dp">

For a full list of supported attributes see here: https://developer.android.com/reference/android/support/v7/widget/CardView.html

If you are using an older API, you will need to call these two functions on your CardView instead:

myCardView.setCardBackgroundColor(Color.TRANSPARENT);
myCardView.setCardElevation(0);
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In my case, I used the attribute android:backgroundTint="@color/some_color",it is only used en API level 21 and higher. And color #50000000 for example.

<android.support.v7.widget.CardView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
card_view:cardCornerRadius="3dp"
app:cardElevation="0dp"
android:backgroundTint="@color/negro_label"
>

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This should work on API 17 

cardView.setBackgroundColor(ContextCompat.getColor(getContext(), android.R.color.transparent));
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in SDK version 21 or higher steps to make Android CardView transparent.

  1. Set android:backgroundTint="@android:color/transparent". This is CardView attribute to set background.

  2. Set android:cardElevation="0dp" to remove the shadow.

For example, here is small xml code to create transparent CardView

<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:cardBackgroundColor="@android:color/transparent"
app:cardElevation="0dp" />
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use app:cardBackgroundColor="@android:color/transparent"

<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="20dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="10dp"
app:cardCornerRadius="16dp"
app:cardElevation="16dp"
app:cardBackgroundColor="@android:color/transparent" >


<--inside cardlayout-->


</android.support.v7.widget.CardView>
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Just add background color app:cardBackgroundColor="#0000"

<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:cardBackgroundColor="#0000">
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You must have cardView to make image circle shape

       <androidx.cardview.widget.CardView
android:layout_width="50dp"
android:layout_height="50dp"
app:cardCornerRadius="25dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:elevation="0dp"
app:cardBackgroundColor="#00424242"
>


<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@drawable/play_icon"
android:padding="5dp"
android:background="#19000000"
android:contentDescription="TODO" />


</androidx.cardview.widget.CardView>

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