获取简单天气预报

参考博文：

https://blog.youkuaiyun.com/huplion/article/details/78984977

https://blog.youkuaiyun.com/Mind_programmonkey/article/details/78438155

工具类

package com.welldones.door.utils;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import com.google.gson.Gson;

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

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class WeatherUtils {

    private Context context;
    private TextView tv_cloud;
    private TextView tv_temper;

    public WeatherUtils(Context context, TextView tv_cloud, TextView tv_temper) {
        this.context = context;
        this.tv_cloud = tv_cloud;
        this.tv_temper = tv_temper;
    }

    private final static String PATH = "http://wthrcdn.etouch.cn/weather_mini?city=";
    protected static final int SUCCESS = 0;
    protected static final int INVALID_CITY = 1;
    protected static final int ERROR = 2;

    private Handler mhandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
//            dialog.dismiss();
            switch (msg.what) {
                case SUCCESS:

                    JSONArray data = (JSONArray) msg.obj;
                    try {
                        // 当天的天气信息
                        String day01 = data.getString(0);
                        Log.e("Weather", "day01:" + day01);
                        // 后一天的天气信息
//                        String day02= data.getString(1);
                        Day day = parseJson(day01);
                        tv_cloud.setText(day.getType());
                        // 截取：低温5°C 中的后部分
                        String low = day.getLow().substring(2);
                        String high = day.getHigh().substring(2);
                        tv_temper.setText(low + "~" + high);
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    break;
                case INVALID_CITY:
                    Toast.makeText(context, "城市无效", Toast.LENGTH_SHORT).show();
                    break;
                case ERROR:
                    Toast.makeText(context, "网络无效", Toast.LENGTH_SHORT).show();
                    break;
                default:
                    break;
            }
        }

        ;
    };

    // 解析json字符串
    private Day parseJson(String json) {
        if (TextUtils.isEmpty(json)) {
            return null;
        }
        Day day = new Gson().fromJson(json, Day.class);
        return day;
    }

    public void startWeather(final String city) {
        //发起请求给那个网站
        new Thread() {
            public void run() {
                try {
                    String ul = PATH + URLEncoder.encode(city, "UTF-8");

                    URL url = new URL(ul);

                    //设置必要的参数信息
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setConnectTimeout(5000);
                    conn.setRequestMethod("GET");

                    //判断响应码
                    int code = conn.getResponseCode();
                    if (code == 200) {
                        //连接网络成功
                        InputStream in = conn.getInputStream();
                        String data = decodeStream(in);


                        //解析json格式的数据
                        JSONObject jsonObj = new JSONObject(data);
                        Log.e("Weather", "jsonObj：" + jsonObj);
                        //获得desc的值
                        String result = jsonObj.getString("desc");
                        if ("OK".equals(result)) {
                            //城市有效，返回了需要的数据
                            JSONObject dataObj = jsonObj.getJSONObject("data");

                            JSONArray jsonArray = dataObj.getJSONArray("forecast");
                            //通知更新ui
                            Message msg = Message.obtain();
                            msg.obj = jsonArray;
                            msg.what = SUCCESS;
                            mhandler.sendMessage(msg);
                        } else {
                            //城市无效
                            Message msg = Message.obtain();
                            msg.what = INVALID_CITY;
                            mhandler.sendMessage(msg);
                        }
                    }
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    Message msg = Message.obtain();
                    msg.what = ERROR;
                    mhandler.sendMessage(msg);
                }
            }

            ;
        }.start();
    }

    private String decodeStream(InputStream in) throws IOException {

        // 底层流
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        int len = 0;
        byte[] buf = new byte[1024];

        while ((len = in.read(buf)) > 0) {
            baos.write(buf, 0, len);
        }

        String data = baos.toString();

        return data;
    }

}

使用

new WeatherUtils(this,tv_cloud,tv_temper).startWeather("南京");

用到了Gson解析Json，添加依赖库