快递单号查询

1.用RxVolley网络请求技术，在APP的build.gradle中添加RxVolley依赖包

    compile 'com.kymjs.rxvolley:rxvolley:1.1.0'

package com.example.courier;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import com.kymjs.rxvolley.RxVolley;
import com.kymjs.rxvolley.client.HttpCallback;

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

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import Adapter.CourierAdapter;
import entity.CourierData;

/**
 * Created by acer-pc on 2018/3/8.
 */

public class CourierActivity extends AppCompatActivity implements View.OnClickListener {
    private EditText et_name;
    private EditText et_number;
    private Button bt;
    private ListView mListView;

    private List<CourierData> mList = new ArrayList<>();
    @Override
    protected void onCreate( Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity);
        initview();
    }

    private void initview() {
        et_name = (EditText)findViewById(R.id.et_name);
        et_number = (EditText)findViewById(R.id.et_number);
        bt= (Button)findViewById(R.id.get_courier);
        mListView = (ListView) findViewById(R.id.mListView);
        bt.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.get_courier:
                /**
                 * 1.获取当前输入框的内容
                 * 2.判断是否为空
                 * 3.拿到数据去请求数据
                 * 4.解析JSon
                 * 5.ListView适配器
                 * 6.实体类（item）
                 * 7.设置数据/显示效果
                 */

                //1.获取当前输入框的内容
                String name = et_name.getText().toString().trim();
                String number = et_number.getText().toString().trim();
                //申请聚合数据中快递单号KEY
                String KEY ="*******";
                //拼接我们的URL
                String url = "http://v.juhe.cn/exp/index?key="+KEY+"&com="+name+"&no="+number;
                //2.判断是否为空
                if(!TextUtils.isEmpty(name)&!TextUtils.isEmpty(number)){
                    //3.拿到数据去请求数据(JSON)
                    RxVolley.get(url, new HttpCallback() {
                        @Override
                        public void onSuccess(String t) {
                            super.onSuccess(t);
                            Toast.makeText(CourierActivity.this,t,Toast.LENGTH_LONG).show();
                            //4.解析JSON
                            parsingJson(t);
                        }
                    });
                }else{
                    Toast.makeText(this,"输入框不能为空",Toast.LENGTH_LONG).show();

                }
                break;
        }
    }

    //解析数据
    private void parsingJson(String t) {
        try {
            JSONObject jsonObject = new JSONObject(t);
            JSONObject jsonResult = jsonObject.getJSONObject("result");
            JSONArray jsonArray = jsonResult.getJSONArray("list");
            for(int i = 0;i<jsonArray.length();i++ ){
                JSONObject json = (JSONObject) jsonArray.get(i);
                CourierData data = new CourierData();
                data.setRemark(json.getString("remark"));
                data.setZone(json.getString("zone"));
                data.setDatetime(json.getString("datetime"));
                mList.add(data);
            }
            //倒序处理
            Collections.reverse(mList);

            CourierAdapter adapter = new CourierAdapter(this,mList);
            mListView.setAdapter(adapter);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

3.实体类（即：从JSON中需要解析的属性）

package entity;

/**
 * Created by acer-pc on 2018/3/8.
 */

public class CourierData {
    //时间
    private String datetime;
    //状态
    private String remark;
    //城市
    private String zone;

    public String getDatetime() {
        return datetime;
    }

    public void setDatetime(String datetime) {
        this.datetime = datetime;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    public String getZone() {
        return zone;
    }

    public void setZone(String zone) {
        this.zone = zone;
    }

    @Override
    public String toString() {
        return "CourierData{" +
                "datetime='" + datetime + '\'' +
                ", remark='" + remark + '\'' +
                ", zone='" + zone + '\'' +
                '}';
    }
}

4.数据：Adatper

package Adapter;

/**
 * Created by acer-pc on 2018/3/8.
 */

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.example.courier.R;

import java.util.List;

import entity.CourierData;

/**
 * 标准套路
 * 1.首先继承与BaseAdapter
 * 2.按住ALT+INS，把getCount，getItem，getItemId，getView方法导入
 * 3.按住ALT+INS，把CourierAdapter构造方法导入
 * 4.CourierAdapter（）要传什么呢？
 * 4.1首先肯定是需要一个上下文(content),
 * 4.2上下文之后肯定需要数据啊，所以需要操作数据List<实体类>
 * 5.布局加载器加载item
 */
public class CourierAdapter extends BaseAdapter {
    private Context mContext;
    private List<CourierData> mList;
    //布局加载器
    private LayoutInflater inflater;
    //声明一个data吧，声明一个实体类
    private CourierData data;
    public CourierAdapter(Context mContext,List<CourierData> mList) {
        this.mContext = mContext;
        this.mList = mList;
        //布局加载器获取服务
        inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        //返回的肯定是数据源的长度
        return mList.size();
    }

    @Override
    public Object getItem(int position) {
        //你要哪个item，我就获取并返回哪个item
        return mList.get(position);
    }

    @Override
    public long getItemId(int position) {
        //有ID的item的话更方便了，直接返回position
        return position;
    }

    //重中之重
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder = null;
        //用ViewHolder缓存
        //第一次加载，需要各种各样的初始化
        if(convertView == null){
            //new一个ViewHolder
            viewHolder = new ViewHolder();
            //加载下item布局
            convertView = inflater.inflate(R.layout.courier_item,null);
            viewHolder.tv_remark = (TextView) convertView.findViewById(R.id.tv_remark);
            viewHolder.tv_zone = (TextView)convertView.findViewById(R.id.tv_zone);
            viewHolder.tv_datetime =(TextView)convertView.findViewById(R.id.tv_datetime);
           //设置缓存
            convertView.setTag(viewHolder);

        }else {
            //否则的话直接去缓存
            viewHolder = (ViewHolder) convertView.getTag();

        }
        //设置数据就好了
        data = mList.get(position);
        viewHolder.tv_remark.setText(data.getRemark());
        viewHolder.tv_zone.setText(data.getZone());
        viewHolder.tv_datetime.setText(data.getDatetime());

        return convertView;
    }

    class  ViewHolder{
        private TextView tv_remark;
        private TextView tv_zone;
        private TextView tv_datetime;


    }

}

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