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);

Bhuvanesh BS解决方案有效。Kotlin版本:

import android.graphics.Canvas
import android.graphics.drawable.Drawable
import androidx.recyclerview.widget.RecyclerView

class DividerItemDecorator(private val mDivider: Drawable?) : RecyclerView.ItemDecoration() {

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

        val dividerLeft = parent.paddingLeft
        val dividerRight = parent.width - parent.paddingRight
        for (i in 0 until parent.childCount - 1) {
            val child = parent.getChildAt(i)
            val dividerTop =
                child.bottom + (child.layoutParams as RecyclerView.LayoutParams).bottomMargin
            val dividerBottom = dividerTop + mDivider!!.intrinsicHeight
            mDivider.setBounds(dividerLeft, dividerTop, dividerRight, dividerBottom)
            mDivider.draw(canvas)
        }
    }
}

好了，如果不需要改变你的分割线颜色，只需对分割线装饰应用alpha。

GridLayoutManager透明的示例:

DividerItemDecoration horizontalDividerItemDecoration = new DividerItemDecoration(WishListActivity.this,
                DividerItemDecoration.HORIZONTAL);
        horizontalDividerItemDecoration.getDrawable().setAlpha(50);
        DividerItemDecoration verticalDividerItemDecoration = new DividerItemDecoration(WishListActivity.this,
                DividerItemDecoration.VERTICAL);
        verticalDividerItemDecoration.getDrawable().setAlpha(50);
        my_recycler.addItemDecoration(horizontalDividerItemDecoration);
        my_recycler.addItemDecoration(verticalDividerItemDecoration);

你仍然可以通过设置颜色来改变分割线的颜色 过滤到它。

GridLayoutManager设置tint的例子:

DividerItemDecoration horizontalDividerItemDecoration = new DividerItemDecoration(WishListActivity.this,
                DividerItemDecoration.HORIZONTAL);
        horizontalDividerItemDecoration.getDrawable().setTint(getResources().getColor(R.color.colorAccent));
        DividerItemDecoration verticalDividerItemDecoration = new DividerItemDecoration(WishListActivity.this,
                DividerItemDecoration.VERTICAL);
        verticalDividerItemDecoration.getDrawable().setAlpha(50);
        my_recycler.addItemDecoration(horizontalDividerItemDecoration);
        my_recycler.addItemDecoration(verticalDividerItemDecoration);

此外，您还可以尝试设置颜色滤镜，

 horizontalDividerItemDecoration.getDrawable().setColorFilter(colorFilter);

为了让nj的回答更简单一点，你可以这样做:

public class DividerColorItemDecoration extends DividerItemDecoration {

    public DividerColorItemDecoration(Context context, int orientation) {
        super(context, orientation);
        setDrawable(ContextCompat.getDrawable(context, R.drawable.line_divider));
    }
}

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)。

在2016年10月的更新中，支持库v25.0.0现在有了基本水平和垂直分隔符的默认实现!

https://developer.android.com/reference/android/support/v7/widget/DividerItemDecoration.html

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