Using RecyclerView with Card

问题

I have some RecyclerView with Card items. And on preLollipop devices it looks fine. But on Lollipop it looks without any spacing between child cards. I tried to use margin and padding, but it didn't help. When I use margin on lollipop it looks fine, but with the same margin on preLollipop spacing is very big. Once again: why is there different spacings? Which property should I use to fix it?

回答1:

This is happening because on L, shadows are outside the the View bounds but pre-L, they are inside the View (unfortunately there is no real shadow support pre-L).

If you want CardView to have same spacing on L as well, set cardUseCompatPadding to true.

回答2:

yigit's answer was helpful but didn't have much detail so I'm adding some here for future viewers of this post.

Here is an example of how I got this working (not obvious from linked android site in yigit's answer).

<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:layout_marginLeft="@dimen/activity_vertical_margin"
    android:layout_marginRight="@dimen/activity_vertical_margin"
    android:layout_marginTop="2dip"
    android:layout_marginBottom="2dip"
    card_view:cardUseCompatPadding="true">

    // Other layouts and views here

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

The card_view needing an underscore and to use the res-auto schema wasn't obvious.

There is a good example of this in the Material Design Training.

回答3:

I had the same problem. I had to create a layout-v21 folder, which will be used by lollipop devices, and duplicate the layout adding the margin/padding I needed to space it out correctly.

That way when your app is launched on lollipop the layout will be read in from the layout-v21 folder with the correct space added, and any other device will go to your standard layout file where the space isn't needed to be explicitly set.

Hope this helps.

来源：https://stackoverflow.com/questions/26892296/using-recyclerview-with-card