RecyclerView空数据提示

柔光的暖阳◎ 2022-05-15 10:24 242阅读 0赞

ViewPager中使用RecyclerView绑定数据时经常会遇到没有数据时，需要显示“无数据”提示用户。下面是我的做法，先上图片效果

![70][]

![70 1][]

原理很简单，没有数据时显示图片和文字提示。

1、xml布局：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
    
        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_Product"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
    
        </android.support.v7.widget.RecyclerView>
    
        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/lay_fragment_ProdutEmpty"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:orientation="vertical"
            android:visibility="gone">
    
            <ImageView
                android:id="@+id/img_fragment_ProdutEmpty"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="15dp"
                android:layout_marginRight="5dp"
                android:layout_marginTop="15dp"
                android:background="@color/systemNoColor"
                android:scaleType="fitXY"
                android:src="@drawable/loadfailed" />
    
            <TextView
                android:id="@+id/tv_fragment_ProdutEmpty"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="15dp"
                android:layout_marginTop="15dp"
                android:text="没有发现任何商品。。。"
                android:textAppearance="?android:attr/textAppearanceMedium"
                android:textColor="@color/aliRed"
                android:textSize="12pt" />
        </LinearLayout>
    </LinearLayout>

2、RecyclerView绑定代码控制：

/**
     * 获取品类商品回调处理
     * Author：William（徐威）
     * Create Time：2018-08-24
     */
    private void getProductCallBack(String strResJson) {
        try {
            recycler_Product = view.findViewById(R.id.recycler_Product);
            lay_fragment_ProdutEmpty=view.findViewById(R.id.lay_fragment_ProdutEmpty);
            GetSelfWeightProductInfoResponseDto response = JsonHelper.convetJsonToClass(strResJson, GetSelfWeightProductInfoResponseDto.class);
            if (response != null && response.getResults() != null && response.getResults().size() > 0) {
                recycler_Product.setVisibility(View.VISIBLE);
                lay_fragment_ProdutEmpty.setVisibility(View.GONE);
                ProductList = response.getResults();
                final List<SelfWeightProductInfoDto> productListCurr = ProductList;
                ProductRecyclerAdapter productRecyAdapter = new ProductRecyclerAdapter(productListCurr, mContext);
                GridLayoutManager gridLayoutManager = new GridLayoutManager(mContext, 4);
    
                productRecyAdapter.setItemClickListener(new ProductRecyclerAdapter.OnItemClickListener() {
                    @Override
                    public void onItemClick(int position) {
                        SelfWeightProductInfoDto model = productListCurr.get(position);
                        Toast.makeText(mContext, String.format("你点击了：%s，商品重量：%s kg", model.ProductName, MainApplication.ProductWeight), Toast.LENGTH_SHORT).show();
                    }
                });
                recycler_Product.setLayoutManager(gridLayoutManager);
                recycler_Product.setAdapter(productRecyAdapter);
            }
            else {
                recycler_Product.setVisibility(View.GONE);
                lay_fragment_ProdutEmpty.setVisibility(View.VISIBLE);
            }
        } catch (Exception ex) {
            Toast.makeText(mContext, String.format("获取品类商品回调处理出错！错误信息：%s。", ex.getMessage()), Toast.LENGTH_LONG).show();
        }
    }

上面完整代码我也贴下：

package com.msh.mshselfweighing.modelinfo;
    
    import android.content.Context;
    import android.content.Intent;
    import android.media.Image;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.support.annotation.Nullable;
    import android.support.v4.app.Fragment;
    import android.support.v7.widget.GridLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    import android.widget.Toast;
    
    import com.msh.mshselfweighing.MainApplication;
    import com.msh.mshselfweighing.R;
    import com.msh.mshselfweighing.dto.Category.GetSelfWeightProductCategoryRequestDto;
    import com.msh.mshselfweighing.dto.Category.GetSelfWeightProductCategoryResponseDto;
    import com.msh.mshselfweighing.dto.Category.SelfWeightProductCategoryDto;
    import com.msh.mshselfweighing.dto.Product.GetSelfWeightProductInfoRequestBody;
    import com.msh.mshselfweighing.dto.Product.GetSelfWeightProductInfoRequestDto;
    import com.msh.mshselfweighing.dto.Product.GetSelfWeightProductInfoResponseDto;
    import com.msh.mshselfweighing.dto.Product.Product_PriceDto;
    import com.msh.mshselfweighing.dto.Product.SelfWeightProductInfoDto;
    import com.msh.mshselfweighing.modelinfo.adapter.ProductRecyclerAdapter;
    import com.msh.mshselfweighing.utils.AppConfig;
    import com.msh.mshselfweighing.utils.EnumCls;
    import com.msh.mshselfweighing.utils.JsonHelper;
    import com.msh.mshselfweighing.utils.OkHttpManager;
    
    import org.w3c.dom.Text;
    
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    
    /**
     * 商品品类Fragment
     * Author：William（徐威）
     * Create Time：2018-08-21
     */
    public class CategoryFragment extends Fragment {
        public View view;
        private ViewGroup viewGroup;
        private Context mContext;
        private int categorySysNo = 0;
        private String categoryName;
        private int count = 0;
        private List<SelfWeightProductInfoDto> ProductList;
        private ImageView img_fragment_ProdutEmpty;
        private RecyclerView recycler_Product;
        private TextView tv_fragment_ProdutEmpty;
        private LinearLayout lay_fragment_ProdutEmpty;
    
        public static CategoryFragment newInstance(int mcategorySysNo, String mcategoryName) {
            CategoryFragment fragment = new CategoryFragment();
            Bundle bundle = new Bundle();
            bundle.putInt("mcategorySysNo", mcategorySysNo);
            bundle.putString("mcategoryName", mcategoryName);
            fragment.setArguments(bundle);
            return fragment;
        }
    
        private Handler handler = new Handler()
        {
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case 1: //获取品类商品信息回调
                        if (msg.obj != null) {
                            try {
                                getProductCallBack(msg.obj.toString());
                            } catch (Exception ex) {
                                ex.printStackTrace();
                            }
                        } else {
                        }
                        break;
                    default:
                        break;
                }
            }
        };
    
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            categorySysNo = getArguments().getInt("mcategorySysNo");
            categoryName = getArguments().getString("mcategoryName");
            view = inflater.inflate(R.layout.category_fragment_view, container, false);
            this.viewGroup = container;
            mContext = getActivity();
    
            getProduct();
    
            return view;
        }
    
        @Override
        public void setUserVisibleHint(boolean isVisibleToUser) {
            count++;
            //请求服务
            if (isVisibleToUser) {
    
            }
        }
    
        /**
         * 获取品类商品
         * Author：William（徐威）
         * Create Time：2018-08-24
         */
        private void getProduct() {
            try {
                final GetSelfWeightProductInfoRequestDto request = new GetSelfWeightProductInfoRequestDto();
                request.setSource(AppConfig.StoreServicesSource);
                request.setSecret(AppConfig.StoreServicesSecret);
                GetSelfWeightProductInfoRequestBody requestBody = new GetSelfWeightProductInfoRequestBody();
                requestBody.setStockSysNo(String.valueOf(MachineBaseInfo.getStockSysNo()));
                requestBody.setImageType(EnumCls.ImageType.ProductListImg.getCode());
                requestBody.setProductCategotySysNo(String.valueOf(categorySysNo));
                requestBody.setLoadImage(true);
                request.setBody(requestBody);
                try {
                    OkHttpManager.sendPost(request, "GetSelfWeightProductInfo",
                            new OkHttpManager.ResultCallback() {
                                @Override
                                public void onCallBack(OkHttpManager.State state, String result) {
                                    //Log.e("onCallBack",":------------result："+result);
                                    Message message = handler.obtainMessage();
                                    message.what = 1;
                                    message.obj = result;
                                    handler.sendMessage(message);
                                }
                            });
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    
        /**
         * 获取品类商品回调处理
         * Author：William（徐威）
         * Create Time：2018-08-24
         */
        private void getProductCallBack(String strResJson) {
            try {
                recycler_Product = view.findViewById(R.id.recycler_Product);
                lay_fragment_ProdutEmpty=view.findViewById(R.id.lay_fragment_ProdutEmpty);
                GetSelfWeightProductInfoResponseDto response = JsonHelper.convetJsonToClass(strResJson, GetSelfWeightProductInfoResponseDto.class);
                if (response != null && response.getResults() != null && response.getResults().size() > 0) {
                    recycler_Product.setVisibility(View.VISIBLE);
                    lay_fragment_ProdutEmpty.setVisibility(View.GONE);
                    ProductList = response.getResults();
                    final List<SelfWeightProductInfoDto> productListCurr = ProductList;
                    ProductRecyclerAdapter productRecyAdapter = new ProductRecyclerAdapter(productListCurr, mContext);
                    GridLayoutManager gridLayoutManager = new GridLayoutManager(mContext, 4);
    
                    productRecyAdapter.setItemClickListener(new ProductRecyclerAdapter.OnItemClickListener() {
                        @Override
                        public void onItemClick(int position) {
                            SelfWeightProductInfoDto model = productListCurr.get(position);
                            Toast.makeText(mContext, String.format("你点击了：%s，商品重量：%s kg", model.ProductName, MainApplication.ProductWeight), Toast.LENGTH_SHORT).show();
                        }
                    });
                    recycler_Product.setLayoutManager(gridLayoutManager);
                    recycler_Product.setAdapter(productRecyAdapter);
                }
                else {
                    recycler_Product.setVisibility(View.GONE);
                    lay_fragment_ProdutEmpty.setVisibility(View.VISIBLE);
                }
            } catch (Exception ex) {
                Toast.makeText(mContext, String.format("获取品类商品回调处理出错！错误信息：%s。", ex.getMessage()), Toast.LENGTH_LONG).show();
            }
        }
    }

[70]: /images/20220515/9e10b930ea9b4f789e0506249b4abdf9.png
[70 1]: /images/20220515/1ce6e1321c714115bfcd420537b9271d.png