搜索菜谱二级列表

2.主类Activity

 

package com.example.administrator.lianxi;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.ExpandableListView;

import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private ExpandableListView lv;
    private EditText name;
    private String s;
    private String path;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //二级列表控件
        lv = (ExpandableListView) findViewById(R.id.lv);
        name = (EditText) findViewById(R.id.name);

    }

    public void go(View view){
        s = name.getText().toString();
        AsyncTask<Void,Void,String>asyncTask=new AsyncTask<Void, Void, String>() {
            @Override
            protected String doInBackground(Void... voids) {

                try {
                    path = "http://apis.juhe.cn/cook/query?key=b0eeae4ccd73cce88a8d78e60c64d61c&rn=10&pn=3&menu="+ URLEncoder.encode(s,"utf-8");
                } catch (Exception e) {
                    e.printStackTrace();
                }
                try {
                    URL url = new URL(path);
                    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                    urlConnection.setRequestMethod("GET");
                    urlConnection.setReadTimeout(5000);
                    urlConnection.setConnectTimeout(5000);
                    int responseCode = urlConnection.getResponseCode();
                    if (responseCode==200){
                        InputStream inputStream = urlConnection.getInputStream();
                        String s = convertStreamToString(inputStream);
                        return s;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(String s) {
                Gson gson = new Gson();
                Data data = gson.fromJson(s, Data.class);
                List<Data.ResultBean.DataBean> data1 = data.getResult().getData();
                Log.d("---------------",data.toString()+"----------------------");
                MyAdapter myAdapter = new MyAdapter(data1, MainActivity.this);
            lv.setAdapter(myAdapter);
            }
        };
        asyncTask.execute();
    }
    /**
     * 将输入流转成字符串
     *
     * @param is
     *            输入流
     * @return 返回字符串
     */
    private static String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}

2.适配器

 

 

package com.example.administrator.lianxi;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.TextView;

import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.List;

/**
 * Created by Administrator on 2017/10/11 0011.
 */

public class MyAdapter extends BaseExpandableListAdapter{
    List<Data.ResultBean.DataBean> list;
    Context con;

    public MyAdapter(List<Data.ResultBean.DataBean> list, Context con) {
        this.list = list;
        this.con = con;
    }

    @Override
    public int getGroupCount() {
        return list.size();
    }

    @Override
    public int getChildrenCount(int i) {
        return list.get(i).getSteps().size();
    }

    @Override
    public Object getGroup(int i) {
        return list.get(i);
    }

    @Override
    public Object getChild(int i, int i1) {
        return list.get(i).getSteps().get(i1);
    }

    @Override
    public long getGroupId(int i) {
        return i;
    }

    @Override
    public long getChildId(int i, int i1) {
        return i1;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public View getGroupView(int i, boolean b, View view, ViewGroup viewGroup) {
      ViewHolder vh;
        if (view==null){
             view = View.inflate(con, R.layout.list_child1, null);
            vh=new ViewHolder();
            vh.textView= (TextView) view.findViewById(R.id.tname);
            vh.imageView= (ImageView) view.findViewById(R.id.timg);
            view.setTag(vh);
        }else{
            vh= (ViewHolder) view.getTag();
        }
        vh.textView.setText(list.get(i).getTitle());
       ImageLoader.getInstance().displayImage(list.get(i).getAlbums().get(0),vh.imageView,ImageUrl.getto());
        return view;
    }

    @Override
    public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) {
        ViewHolder1 vh;
        if (view==null){
            view = View.inflate(con, R.layout.list_child2, null);
            vh=new ViewHolder1();
            vh.textView= (TextView) view.findViewById(R.id.vname);
            vh.imageView= (ImageView) view.findViewById(R.id.vimg);
            view.setTag(vh);
        }else{
            vh= (ViewHolder1) view.getTag();
        }
        vh.textView.setText(list.get(i).getSteps().get(i).getStep());
        ImageLoader.getInstance().displayImage(list.get(i).getSteps().get(i1).getImg(),vh.imageView,ImageUrl.getto());
        return view;
    }

    @Override
    public boolean isChildSelectable(int i, int i1) {
        return true;
    }
    class ViewHolder{
        TextView textView;
        ImageView imageView;
    }
    class ViewHolder1{
        TextView textView;
        ImageView imageView;
    }
}