只需在您的RecycleView适配器的项目底部添加x量的边缘。

onCreateViewHolder

LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);

layoutParams.setMargins(0, 0, 0, 5);
itemView.setLayoutParams(layoutParams);

你需要添加下一行…

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

不幸的是，Android只是把小事情变得太复杂了。实现你想要的最简单的方法，没有实现这里的DividerItemDecoration:

为RecyclerView添加你想要的分割线颜色的背景色:

<RecyclerView
    android:id="@+id/rvList"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:divider="@color/colorLightGray"
    android:scrollbars="vertical"
    tools:listitem="@layout/list_item"
    android:background="@android:color/darker_gray"/>

添加底部边距(android:layout_marginBottom)到项目的布局根(list_item.xml):

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="1dp">

    <TextView
        android:id="@+id/tvName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="John Doe" />

    <TextView
        android:id="@+id/tvDescription"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tvName"
        android:text="Some description blah blah" />

</RelativeLayout>

这将在项目和RecyclerView的背景色之间提供1dp的空间(它是深灰色，将作为分隔符出现)。

只需在项目适配器的末尾添加一个视图:

<View
 android:layout_width="match_parent"
 android:layout_height="1dp"
 android:background="#FFFFFF"/>

  class ItemOffsetDecoration(
        context: Context,
        private val paddingLeft: Int,
        private val paddingRight: Int
    ) : RecyclerView.ItemDecoration() {
        private var mDivider: Drawable? = null

        init {
            mDivider = ContextCompat.getDrawable(context, R.drawable.divider_medium)
        }

        override fun onDrawOver(c: Canvas, parent: RecyclerView, state: RecyclerView.State) {
            val left = parent.paddingLeft + paddingLeft
            val right = parent.width - parent.paddingRight - paddingRight
            val childCount = parent.childCount
            for (i in 0 until childCount) {
                val child = parent.getChildAt(i)
                val params = child.layoutParams as RecyclerView.LayoutParams
                val top = child.bottom + params.bottomMargin
                val bottom = top + (mDivider?.intrinsicHeight ?: 0)

                mDivider?.let {
                    it.setBounds(left, top, right, bottom)
                    it.draw(c)
                }
            }
        }
    }

你只需要在R.drawable.divider_medium中指定一个颜色

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="@android:color/black" />
    <size
        android:height="1dp"
        android:width="1dp" />

</shape>

并将它添加到您的recyclerView

recyclerView.addItemDecoration(
                        ItemOffsetDecoration(
                            this,
                            resources.getDimension(resources.getDimension(R.dimen.dp_70).roundToInt()).roundToInt(),
                            0
                        )
                    )

refernce这

正确的方法是为RecyclerView定义ItemDecoration如下所示

SimpleDividerItemDecoration.java

public class SimpleDividerItemDecoration extends RecyclerView.ItemDecoration {
    private Drawable mDivider;
 
    public SimpleDividerItemDecoration(Context context) {
        mDivider = ContextCompat.getDrawable(context, R.drawable.line_divider);
    }
 
    @Override
    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int left = parent.getPaddingLeft();
        int right = parent.getWidth() - parent.getPaddingRight();
 
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);
 
            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
 
            int top = child.getBottom() + params.bottomMargin;
            int bottom = top + mDivider.getIntrinsicHeight();
 
            mDivider.setBounds(left, top, right, bottom);
            mDivider.draw(c);
        }
    }
}

或者如果您正在使用kotlin: SimpleDividerItemDecoration.kt

class SimpleDividerItemDecoration(context: Context, @DrawableRes dividerRes: Int) : ItemDecoration() {

    private val mDivider: Drawable = ContextCompat.getDrawable(context, dividerRes)!!

    override fun onDrawOver(c: Canvas, parent: RecyclerView) {
        val left = parent.paddingLeft
        val right = parent.width - parent.paddingRight
        val childCount = parent.childCount
        for (i in 0 until childCount) {
            val child: View = parent.getChildAt(i)
            val params = child.layoutParams as RecyclerView.LayoutParams
            val top: Int = child.bottom + params.bottomMargin
            val bottom = top + mDivider.intrinsicHeight
            mDivider.setBounds(left, top, right, bottom)
            mDivider.draw(c)
        }
    }
}
    

line_divider.xml:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
 
    <size
        android:width="1dp"
        android:height="1dp" />
 
    <solid android:color="@color/dark_gray" />
 
</shape>

最后像这样设置

recyclerView.addItemDecoration(new SimpleDividerItemDecoration(this));

Edit

正如@Alan Solitar指出的那样

context.getResources().getDrawable(R.drawable.line_divider); 

是折旧而不是你可以使用的

ContextCompat.getDrawable(context,R.drawable.line_divider);