android RecyclerView不像过去的ListView那样随意的设置水平方向的分割线，如果要实现RecyclerView的水平/垂直分割线，则需要继承自RecyclerView.ItemDecoration重写getItemOffsets方法，从而增加水平/垂直分割线。

写一个例子。

MainActivity.Java：

package zhangphil.app;import android.content.Context;import android.graphics.Color;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); RecyclerView mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView); // 两列 int spanCount = 2; // StaggeredGridLayoutManager管理RecyclerView的布局。 StaggeredGridLayoutManager mLayoutManager = new StaggeredGridLayoutManager(spanCount, StaggeredGridLayoutManager.VERTICAL); mRecyclerView.setLayoutManager(mLayoutManager); //为RecyclerView增加分割线，水平和垂直方向都有。增加分割线值比如为32。 RecyclerViewItemDecoration decoration = new RecyclerViewItemDecoration(32); mRecyclerView.addItemDecoration(decoration); RecyclerViewAdapter mAdapter = new RecyclerViewAdapter(this); mRecyclerView.setAdapter(mAdapter); } private class ItemViewHolder extends RecyclerView.ViewHolder { private TextView text; public ItemViewHolder(View itemView) { super(itemView); text = (TextView) itemView.findViewById(android.R.id.text1); text.setTextColor(Color.WHITE); } } public class RecyclerViewAdapter extends RecyclerView.Adapter<ItemViewHolder> { private Context context; public RecyclerViewAdapter(Context context) { super(); this.context = context; } @Override public ItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) { View view = View.inflate(context, android.R.layout.simple_list_item_1, null); view.setBackgroundColor(Color.RED); ItemViewHolder holder = new ItemViewHolder(view); return holder; } @Override public void onBindViewHolder(ItemViewHolder viewHolder, int pos) { viewHolder.text.setText(String.valueOf(pos)); } @Override public int getItemCount() { return 15; } }}

布局文件，很简单，就放一个RecyclerView，注意背景颜色的设置：

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/holo_orange_light"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v7.widget.RecyclerView></RelativeLayout>

最关键的RecyclerViewItemDecoration.java：

package zhangphil.app;/** * Created by Phil on 2016/10/8. */import android.graphics.Rect;import android.support.v7.widget.RecyclerView;import android.view.View;/** * 为RecyclerView增加间距 * 预设2列，如果是3列，则左右值不同 */public class RecyclerViewItemDecoration extends RecyclerView.ItemDecoration { private int space = 0; private int pos; public RecyclerViewItemDecoration(int space) { this.space = space; } @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { outRect.top = space; //该View在整个RecyclerView中位置。 pos = parent.getChildAdapterPosition(view); //取模 //两列的左边一列 if (pos % 2 == 0) { outRect.left = space; outRect.right = space / 2; } //两列的右边一列 if (pos % 2 == 1) { outRect.left = space / 2; outRect.right = space; } }}

代码运行结果：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。