三级列表展示

最新推荐文章于 2020-12-22 14:59:45 发布

原创最新推荐文章于 2020-12-22 14:59:45 发布 · 1.3k 阅读

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这篇博客介绍了如何在Android应用中创建一个三级列表展示，利用RecyclerView和GridLayoutManager展示数据。通过SecendAdapter类，将JSON数据解析并绑定到RecyclerView的ViewHolder中。在适配器内部，使用OkHttp进行网络请求获取商品信息，并在回调中更新UI，避免在主线程中处理网络数据。

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package com.bw.com.week03test.adapter;

import android.content.Context;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.bw.com.week03test.R;
import com.bw.com.week03test.okhttputils.OkHttpUtils;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;

import javax.net.ssl.SNIHostName;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

ic class SecendAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
Context context;
JSONArray result;
public SecendAdapter(Context context, JSONArray result) {
this.context=context;
this.result=result;
}
private Handler handler=new Handler();

@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view = LinearLayout.inflate(context, R.layout.item03, null);
    ViewHolder holder = new ViewHolder(view);
    return holder;
}

@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {

//实例化hodler
final ViewHolder holder= (ViewHolder) viewHolder;
//解析数据
try {
JSONObject jsonObject = result.getJSONObject(i);
String name = jsonObject.getString(“name”);
String id = jsonObject.getString(“id”);
//设置
holder.title.setText(name);
---------------------------------------------------------------------------------
String url=“http://172.17.8.100/small/commodity/v1/findCommodityByCategory?categoryId="+id+"&page=1&count=5”;
;
//获取网络数据
OkHttpUtils.getInstance().doGet(url, new Callback() {

            private String json;

            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {

                json = response.body().string();
                Log.i("aaa", json);
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            JSONObject jsonObject1 = new JSONObject(json);
                            JSONArray result = jsonObject1.getJSONArray("result");
                            //网格化
                            GridLayoutManager gridLayoutManager = new GridLayoutManager(context,3);
                            holder.rlv.setLayoutManager(gridLayoutManager);
                            //适配器
                            ThirdAdapter thirdAdapter = new ThirdAdapter(context, result);
                            holder.rlv.setAdapter(thirdAdapter);

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                });
            }
        });

直接在onbind方法中解析数据使用适配器直接用handler.post方法
} catch (JSONException e) {
e.printStackTrace();
}
}

@Override
public int getItemCount() {
    return result.length();
}
private class ViewHolder extends RecyclerView.ViewHolder{

    private final TextView title;
    private final RecyclerView rlv;

    public ViewHolder(@NonNull View itemView) {
        super(itemView);
        //找控件
        title = itemView.findViewById(R.id.item03_title);
        rlv = itemView.findViewById(R.id.rlv);

    }
}

}