Android RecyclerView是一个加载列表最方便的组件，也是使用非常广泛的，下面就来学习一下RecyclerView的使用吧！

步骤一：在layout xml中添加RecyclerView组件，代码如下：

<android.support.v7.widget.RecyclerView
	android:id = "@+id/gridView"
	android:layout_width="750px"
	android:layout_height="260px"
	android:numColumns="4"
	android:scrollbars="none"
	android:listSelector="@null"
	/>

步骤二：在layout layout里面添加一个文件作为RecyclerView的item，如“xxx_item.xml”文件，小编在的项目中的文件名称是“money_item.xml”，代码如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="180px"
    android:layout_height="230px"
    android:background="@mipmap/moneybg"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical"
        android:layout_marginTop="45px">
        <TextView
            android:id="@+id/tv_moneyNum"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="￥10.00"
            android:textSize="30px"
            android:textStyle="bold"
            />
        <TextView
            android:id="@+id/tv_timeNum"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="15px"
            android:text="- 10分钟 -"
            android:textSize="20px"
            />
    </LinearLayout>
</RelativeLayout>

效果大致如下：

步骤三：初始化RecycleView，并加载数据，这是小编在自定义Dialog里面加载RecycleView列表的示例，代码如下：

package com.xuanyin.homektv.fragment;


public class PayMoneyDialog extends Dialog {

    private boolean cancelable = true;
    private RecyclerView gridView;
	
	//存储列表的数据的集合
    private List<Map<String, Object>> priceMapList = new ArrayList<Map<String, Object>>();

    public PayMoneyDialog(@NonNull Context context) {
        super(context, R.style.MyDialog);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.pay_money_dialog);

        gridView = findViewById(R.id.gridView);
        //alertDialog是否可以点击外围消失
        setCanceledOnTouchOutside(cancelable);
        setCancelable(cancelable);

	//加载数据并显示列表
        loadPriceList();
    }

    private void loadPriceList() {
    
	//给priceMapList集合添加数据
        for (int i=1;i<10;i++){
            Map<String, Object> map = new HashMap<>();
            map.put("tv_moneyNum","￥"+i*10+".00");
            map.put("totalMoney",i*10);
            if(i % 5 == 0){
                map.put("currType",0);
                map.put("tv_timeNum","- 一首歌 -");
            }else{
                map.put("currType",1);
                map.put("tv_timeNum","- "+i*10+"分钟 -");
                map.put("payTimeNum",i*10);
            }
            priceMapList.add(map);
        }
		
	//设置RecycleView列表
        setGridView();
    }

    public class MyHolder extends RecyclerView.ViewHolder {
        public TextView tv_moneyNum, tv_timeNum;

        public MyHolder(View itemView) {
            super(itemView);
            tv_moneyNum = (TextView) itemView.findViewById(R.id.tv_moneyNum);
            tv_timeNum = (TextView) itemView.findViewById(R.id.tv_timeNum);
        }
    }

    private static RecyclerView.Adapter simpleAdapter = null;
    private int curr_row = -1;
    private void setGridView() {
        // 设置数据
        simpleAdapter = new RecyclerView.Adapter() {
            @NonNull
            @Override
            public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
                View view = LayoutInflater.from(getContext()).inflate(R.layout.money_item,viewGroup, false);
                return new PayMoneyDialog.MyHolder(view);
            }

            @Override
            public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int position) {
                Map<String, Object> map = priceMapList.get(position);
                ((MyHolder) viewHolder).tv_moneyNum.setText(map.get("tv_moneyNum")+"");
                ((MyHolder) viewHolder).tv_moneyNum.setTypeface(tf);
                ((MyHolder) viewHolder).tv_timeNum.setText(map.get("tv_timeNum")+"");
                ((MyHolder) viewHolder).tv_timeNum.setTypeface(tf);
				
		//设置RecycleView item的点击事件
                viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        curr_row = position;
                        notifyDataSetChanged();
                    }
                });
				
		//点击item显示不同的背景
                if(curr_row != position){
                    viewHolder.itemView.setBackgroundResource(R.mipmap.moneybg);
                }else{
                    viewHolder.itemView.setBackgroundResource(R.mipmap.moneybg_selected);
                }
            }

            @Override
            public int getItemCount() {
                return priceMapList.size();
            }
        };
	//设置adapter
        gridView.setAdapter(simpleAdapter);
	//设置RecycleView最小宽度
        gridView.setMinimumWidth(700);
	//设置RecycleView横向滑动，如果是竖向滑动，则HORIZONTAL设置成VERTICAL
        gridView.setLayoutManager(new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false));
	//设置item右边间距，下左上分别为:bottom，left，top
        RecyclerView.ItemDecoration decoration = new RecyclerView.ItemDecoration() {
            @Override
            public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
                super.getItemOffsets(outRect, view, parent, state);
                outRect.right = 10;
            }
        };
	//应用间距设置属性
        gridView.addItemDecoration(decoration);
    }


}