这实际上并不能解决问题，但是作为一种临时的解决方法，您可以在XML布局中的卡片上设置useCompatPadding属性，使其与在前lollipop版本中测量的相同。

card_view:cardUseCompatPadding="true"

其中一种方法是同时使用cardview和recycler视图。我们可以很容易地添加一个效果，比如分隔线。 示例:使用RecyclerView创建动态列表 另一种方法是将视图作为分隔符添加到回收器视图的list_item_layout中。 <视图 android: id =“@ + id / view1” android: layout_width = " match_parent " android: layout_height = " 1 dp " android:背景= " @color / colorAccent " / >

使用RecyclerView itemdecoration -一个基本的分隔符样本在Kotlin android

一个完整的示例，包括一个构建器，添加边缘或使用资源颜色的可能性

    class SeparatorDecoration constructor(ctx: Context, @ColorRes dividerColor: Int, heightDp: Float) :
    RecyclerView.ItemDecoration() {

    private val mPaints = Paint()

    init {
        mPaints.color = dividerColor
        val thickness = TypedValue.applyDimension(
            TypedValue.COMPLEX_UNIT_DIP,
            heightDp,
            ctx.resources.displayMetrics
        )
        mPaints.strokeWidth = thickness
    }

    override fun getItemOffsets(
        outRect: Rect,
        view: View,
        parent: RecyclerView,
        state: RecyclerView.State
    ) {
        val params = view.layoutParams as RecyclerView.LayoutParams

        // and add a separator to any view but the last one
        val p = params.viewAdapterPosition

        // and add a separator to any view but the last one
        if (p < state.itemCount) outRect[0, 0, 0] =
            mPaints.strokeWidth.toInt() // left, top, right, bottom
        else outRect.setEmpty() // 0, 0, 0, 0
    }

    override fun onDraw(c: Canvas, parent: RecyclerView, state: RecyclerView.State) {

        // we set the stroke width before, so as to correctly draw the line we have to offset by width / 2
        val offset = (mPaints.strokeWidth / 2).roundToInt()

        // this will iterate over every visible view
        for (i in 0 until parent.childCount) {
            // get the view
            val view: View = parent.getChildAt(i)
            val params = view.layoutParams as RecyclerView.LayoutParams

            // get the position
            val position = params.viewAdapterPosition

            // and finally draw the separator
            if (position < state.itemCount) {
                c.drawLine(
                    view.left.toFloat(),
                    (view.bottom + offset).toFloat(),
                    view.right.toFloat(), (view.bottom + offset).toFloat(), mPaints
                )
            }
        }
    }
  }

设置很简单。只需将您的装饰与其余的初始设置一起添加到您的recyclerView。

 val decoration = SeparatorDecoration(context, R.color.primaryColor, 1.5f)
 recyclerview.addItemDecoration(decoration)

只需添加

recyclerView.addItemDecoration(new DividerItemDecoration(getContext(),
                DividerItemDecoration.VERTICAL));

此外，您可能还需要添加依赖项 实现“com.android.support: recyclerview-v7:28.0.0”

为了自定义它，你可以添加一个自定义drawable:

DividerItemDecoration itemDecorator = new DividerItemDecoration(getContext(), DividerItemDecoration.VERTICAL);
itemDecorator.setDrawable(ContextCompat.getDrawable(getContext(), R.drawable.divider));

你可以自由地使用任何自定义绘图，例如:

<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
    <solid android:color="@color/colorPrimary"/>
    <size android:height="0.5dp"/>
</shape>

最新的方法是这样的，例如在Fragment的onCreateView中使用:

        val recyclerView = rootView.findViewById<RecyclerView>(R.id.recycler_view)
        recyclerView.adapter = mListAdapter
        recyclerView.layoutManager = LinearLayoutManager(context)
        rootView.context.let {
            val dividerItemDecoration = MaterialDividerItemDecoration(
                it,
                MaterialDividerItemDecoration.VERTICAL
            )
            dividerItemDecoration.isLastItemDecorated = false

            // https://github.com/material-components/material-components-android/blob/master/docs/components/Divider.md
            // Needed if you did not set colorOnSurface in your theme because otherwise the default color would be pink_900 -> default according to Material should be colorOnSurface (12% opacity applied automatically on top).
//            dividerItemDecoration.setDividerColorResource(it, R.color.colorDivider)

            recyclerView.addItemDecoration(dividerItemDecoration)
        }

我想你们可以忘记之前所有的解。

public class CommonItemSpaceDecoration extends RecyclerView.ItemDecoration {

    private int mSpace = 0;
    private boolean mVerticalOrientation = true;

    public CommonItemSpaceDecoration(int space) {
        this.mSpace = space;
    }

    public CommonItemSpaceDecoration(int space, boolean verticalOrientation) {
        this.mSpace = space;
        this.mVerticalOrientation = verticalOrientation;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.top = SizeUtils.dp2px(view.getContext(), mSpace);
        if (mVerticalOrientation) {
            if (parent.getChildAdapterPosition(view) == 0) {
                outRect.set(0, SizeUtils.dp2px(view.getContext(), mSpace), 0, SizeUtils.dp2px(view.getContext(), mSpace));
            } else {
                outRect.set(0, 0, 0, SizeUtils.dp2px(view.getContext(), mSpace));
            }
        } else {
            if (parent.getChildAdapterPosition(view) == 0) {
                outRect.set(SizeUtils.dp2px(view.getContext(), mSpace), 0, 0, 0);
            } else {
                outRect.set(SizeUtils.dp2px(view.getContext(), mSpace), 0, SizeUtils.dp2px(view.getContext(), mSpace), 0);
            }
        }
    }
}

这将增加每个项目的顶部和底部(或左右)的空间。然后你可以将它设置为你的recyclerView。

recyclerView.addItemDecoration(new CommonItemSpaceDecoration(16));

文件SizeUtils.java

public class SizeUtils {
    public static int dp2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }
}