Android studio 微信APP之Fragment中使用ReclerView

如题，本次实验的内容就是在已经创建好的微信程序的首页处，在fragment控件中增加ReclerView控件，实现首页内容的多样化（微信首页的制作参考：微信程序首页）
首先还是对布局进行一个说明：

这一步仅仅是将控件添加到fragment中，而并没有对ReclerView进行布局。
因此，我们还要对ReclerView进行布局

接下来就是对控件的函数控制了

首先，我们需要为需要引用的数据建立一个类，来提供数据修改的接口

class GoodsEntity implements Serializable {
    public String imgPath;//图片地址
    public String goodsName;//货物名称
    public String goodsPrice;//货物价格
    public String goodsNameTitle;//商品名称标签
    public String goodsPriceTitle;//商品价格标签
    public GoodsEntity() {
    }
    public GoodsEntity(String imgPath, String goodsName, String goodsPrice,String goodsNameTitle,String goodsPriceTitle) {
        this.imgPath = imgPath;
        this.goodsName = goodsName;
        this.goodsPrice = goodsPrice;
        this.goodsNameTitle = goodsNameTitle;
        this.goodsPriceTitle = goodsPriceTitle;
    }
    //图片的路径获取方法
    public String getImgPath() {
        return imgPath;
    }
    public void setImgPath(String imgPath) {
        this.imgPath = imgPath;
    }
    //商品名字的获取方法
    public String getGoodsName() {
        return goodsName;
    }
    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }
    //商品名字标签的获取方法
    public String getGoodsNameTitle(){
        return goodsNameTitle;
    }
    public void setGoodsNameTitle(String goodsNameTitle){
        this.goodsNameTitle = goodsNameTitle;
    }
    //商品价格标签的获取方法
    public  String getGoodsPriceTitle(){
        return goodsPriceTitle;
    }
    public void setGoodsPriceTitle(String goodsPriceTitle){
        this.goodsPriceTitle = goodsPriceTitle;
    }
    //商品价格的获取方法
    public String getGoodsPrice() {
        return goodsPrice;
    }
    public void setGoodsPrice(String goodsPrice) {
        this.goodsPrice = goodsPrice;
    }
    @Override
    public String toString() {
        return "GoodsEntity{" +
                "imgPath='" + imgPath + '\'' +
                ", goodsName='" + goodsName + '\'' +
                ", goodsNameTitle='" + goodsNameTitle + '\'' +
                ", goodsPrice='" + goodsPrice + '\'' +
                ", goodsPriceTitle='" + goodsPriceTitle + '\'' +
                '}';
    }
}

没有什么好说的，就是定义变量，get变量，set变量，别命名错了就行了

随后，便是重点，我们要创建ReclerView的adapter了
（也就是这里，我们可以控制ReclerView的展现形式，我这里采用的最简单的线性排布）

class LinearAdapter extends RecyclerView.Adapter {
    private OnItemClickListener onItemClickListener;
    private Context context;
    private ArrayList goodsEntities;
    public LinearAdapter(Context context,ArrayList goodsEntities){
        this.context = context;
        this.goodsEntities = goodsEntities;
    }
    @NonNull
    @Override
    public LinearAdapter.myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = View.inflate(context, R.layout.layout_linear_item,null);
        return new myViewHolder(itemView);
    }
    @Override
    public void onBindViewHolder(@NonNull LinearAdapter.myViewHolder holder, int position) {
        GoodsEntity data = goodsEntities.get(position);
        holder.mItemGoodsName.setText(data.goodsName);
        holder.mItemGoodsPrice.setText(data.goodsPrice);
        holder.mItemGoodsNameTitle.setText(data.goodsNameTitle);
        holder.mItemGoodsPriceTitle.setText(data.goodsPriceTitle);
    }
    @Override
    public int getItemCount() {
        return goodsEntities.size();
    }
    class myViewHolder extends RecyclerView.ViewHolder {
		//定义控件
        private ImageView mItemGoodsImg;
        private TextView mItemGoodsName;
        private TextView mItemGoodsPrice;
        private TextView mItemGoodsNameTitle;
        private TextView mItemGoodsPriceTitle;
        public myViewHolder(@NonNull View itemView) {
            super(itemView);
            //找到控件
            mItemGoodsImg = itemView.findViewById(R.id.item_goods_img);
            mItemGoodsName = itemView.findViewById(R.id.item_goods_name);
            mItemGoodsPrice = itemView.findViewById(R.id.item_goods_price);
            mItemGoodsNameTitle = itemView.findViewById(R.id.item_goods_nametitle);
            mItemGoodsPriceTitle = itemView.findViewById(R.id.item_goods_pricetitle);
			//设置点击事件
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (onItemClickListener!=null){
                        onItemClickListener.OnItemClick(v,goodsEntities.get(getLayoutPosition()));
                    }
                }
            });
        }
    }
	//设置点击事件监听器
    public interface OnItemClickListener {
        public void OnItemClick(View view, GoodsEntity data);
    }
    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }
}

最后就是对fragment的类的函数编写

public class weixinFragment extends Fragment {
    private RecyclerView mRvMain; //定义ReclerView控件
    private View view;//定义view来设置fragment中的layout
    private ArrayList goodsEntities = new ArrayList();
    private LinearAdapter mLinearAdapter;
    public weixinFragment() {
        // Required empty public constructor
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        view = inflater.inflate(R.layout.tab01, container, false);
        initRecyclerView();
        initData();
        return view;
    }
    //
    private void initRecyclerView() {
        mRvMain = (RecyclerView)view.findViewById(R.id.rv_main);
        mLinearAdapter = new LinearAdapter(getActivity(),goodsEntities);
        mRvMain.setAdapter(mLinearAdapter);
        mRvMain.setLayoutManager(new LinearLayoutManager(getActivity(),LinearLayoutManager.VERTICAL,false));
        mRvMain.addItemDecoration(new DividerItemDecoration(getActivity(),DividerItemDecoration.VERTICAL));
        mLinearAdapter.setOnItemClickListener(new LinearAdapter.OnItemClickListener() {
            @Override
            public void OnItemClick(View view, GoodsEntity data) {
                Toast.makeText(getActivity(),"图片售罄",Toast.LENGTH_SHORT).show();
            }
        });
    }
    //
    private void initData(){
        for (int i=0;i<10;i++){
            GoodsEntity goodsEntity = new GoodsEntity();
            goodsEntity.setGoodsNameTitle("  图片名称：");
            goodsEntity.setGoodsName("图片序号"+i);
            goodsEntity.setGoodsPriceTitle("  图片价格：");
            goodsEntity.setGoodsPrice("1"+i*100+"RMB");
            goodsEntities.add(goodsEntity);
        }
    }
}

至此 大功告成，值得一提的是，在这个项目中，我设置的图片是直接去一张图片来显示，也可以在fragment中设置文件路径，然后我们对图片的命名采用迭代的命名方式（就是img1、img2这样子一直下去），然后在initData函数中使用goodsEntity.setImgPath("…/mipmap/"+i);的方式来一次获取图片。。。
但是图片太难找了。。。emmm所以这里就直接用一张图片放上去意思一下算了
那么最后，附上整个项目的源码，需要的码云自取
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