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：

在fragment对应的layout中添加ReclerView控件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="match_parent"android:layout_height="wrap_content"><androidx.recyclerview.widget.RecyclerViewandroid:id="@+id/rv_main"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="#BBBBBB"/></LinearLayout>

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

ReclerView的布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="#ffffff">
<!--左侧的图片布局盒子--><LinearLayoutandroid:id="@+id/ll_1"android:layout_width="wrap_content"android:layout_height="125dp"android:gravity="center"><ImageViewandroid:id="@+id/item_goods_img"android:layout_width="100dp"android:layout_height="100dp"android:layout_margin="10dp"android:src="@mipmap/picture1"android:background="#4D2BD5"/></LinearLayout>
<!--右侧文字盒子布局--><LinearLayoutandroid:id="@+id/ll_2"android:layout_width="match_parent"android:layout_height="125dp"android:orientation="vertical"><!--名字TextView所在盒子布局--><LinearLayoutandroid:id="@+id/ll_2_name"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:layout_marginBottom="10dp"><TextViewandroid:id="@+id/item_goods_nametitle"android:layout_width="90dp"android:layout_height="25dp"android:text=""android:textSize="16sp"android:textColor="#000000" /><TextViewandroid:id="@+id/item_goods_name"android:layout_width="190dp"android:layout_height="25dp"android:text=""android:textSize="20sp"android:textColor="#000000" /></LinearLayout><!--价格TextView所在盒子布局--><LinearLayoutandroid:id="@+id/ll_2_price"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="10dp"><TextViewandroid:id="@+id/item_goods_pricetitle"android:layout_width="90dp"android:layout_height="25dp"android:text=""android:textSize="16sp"android:textColor="#000000" /><TextViewandroid:id="@+id/item_goods_price"android:layout_width="190dp"android:layout_height="25dp"android:text=""android:textSize="20sp"android:textColor="#000000" /></LinearLayout></LinearLayout>
</LinearLayout>

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

GoodsEntity.java:

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;}@Overridepublic 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）

LinearAdapter：

class LinearAdapter extends RecyclerView.Adapter<LinearAdapter.myViewHolder> {private OnItemClickListener onItemClickListener;private Context context;private ArrayList<GoodsEntity> goodsEntities;public LinearAdapter(Context context,ArrayList<GoodsEntity> goodsEntities){this.context = context;this.goodsEntities = goodsEntities;}@NonNull@Overridepublic LinearAdapter.myViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {View itemView = View.inflate(context, R.layout.layout_linear_item,null);return new myViewHolder(itemView);}@Overridepublic 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);}@Overridepublic 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() {@Overridepublic 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

weixinFragment：

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layoutprivate ArrayList<GoodsEntity> goodsEntities = new ArrayList<GoodsEntity>();private LinearAdapter mLinearAdapter;public weixinFragment() {// Required empty public constructor}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// Inflate the layout for this fragmentview = 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() {@Overridepublic 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
码云仓库