大学androidDemo主要代码

      package com.example.weather;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import org.jetbrains.annotations.NotNull;
import org.json.JSONArray;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;


public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    public static final int MSG_DOWN_OK=1;
    public static final int MSG_DOWN_ERROR=2;

    private EditText m_cityEdit;
    private Button m_queryBtn;
    private ListView m_listview;

    private static String m_data="";
    private List<Weather> m_datalist=null;//未来5天的数据
    private Weather m_nowWeather;//实时数据

    private DataAdapter listAdapter;


    //uiHandler
    private Handler uiHandler =new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case MSG_DOWN_OK:{
                    //更新ui
                    System.out.println("main thread get essage from down thread.");
                    displayDataToUI();
                    break;
                }
                case MSG_DOWN_ERROR:{
                    Toast.makeText(MainActivity.this,"下载天气预报失败！",Toast.LENGTH_LONG).show();
                    break;
                }
            }
        }
    };



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_weather);

        m_cityEdit=(EditText)findViewById(R.id.edit_city);
        m_queryBtn=(Button)findViewById(R.id.btn_query);
        m_listview=(ListView)findViewById(R.id.dataListview);

        //设置背景透明度，需存在背景
        View view_city=findViewById(R.id.layout_city);
        //view_city.getBackground().setAlpha(100);
        View view_now=findViewById(R.id.layout_nowweather);
        view_now.getBackground().setAlpha(100);
        View view_future=findViewById(R.id.layout_future);
        view_future.getBackground().setAlpha(100);
        View view_icon=findViewById(R.id.layout_icon);
        view_icon.getBackground().setAlpha(100);


        m_queryBtn.setOnClickListener(this);

        //默认天气为北京
        String defaultcity=m_cityEdit.getText().toString().trim();//默认为北京
        //在子线程下载数据
        DownThread mythread=new DownThread(defaultcity);
        mythread.start();


    }//end of onCreate

    @Override
    public void onClick(View v) {
        try {
            switch (v.getId()){
                case R.id.btn_query:{
                    String cityname=m_cityEdit.getText().toString().trim();
                    //输入有效性
                    if(cityname.equals("")){
                        Toast.makeText(this,"请输入要查询的城市!",Toast.LENGTH_LONG).show();
                        return;
                    }

                    //String citynameutf8= URLEncoder.encode(cityname,"UTF-8");

                    //在子线程下载数据
                    DownThread mythread=new DownThread(cityname);
                    mythread.start();
                    break;

                }
                default:
                    break;

            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }//end of onClick

    /*
        显示数据到ui界面
     */
    private void displayDataToUI(){
        System.out.println("main:"+m_data);
        if (parseJsonData()==false){
            //提示
            Toast.makeText(this,"下载的数据有错误！",Toast.LENGTH_LONG).show();
            return;
        }
        displayNowWeather();

        listAdapter=new DataAdapter(this,R.layout.list_weather,m_datalist,m_listview);
        m_listview.setAdapter(listAdapter);


    }//end of displayDataToUI

    @SuppressLint("SetTextI18n")
    private void displayNowWeather(){
        ImageView image_nowweather=(ImageView)findViewById(R.id.image_nowweather);
        TextView text_nowtemp=(TextView)findViewById(R.id.text_tempnow);//温度
        TextView text_nowweather=(TextView)findViewById(R.id.text_situation);//天气情况
        TextView text_nowdirection=(TextView)findViewById(R.id.text_direction);//风向
        TextView text_nowpower=(TextView)findViewById(R.id.text_power);//风力
        TextView text_nowquality=(TextView)findViewById(R.id.text_quality);//空气质量
        TextView text_city=(TextView)findViewById(R.id.text_city);//当前城市
        TextView text_humidity=(TextView)findViewById(R.id.text_humidity);//湿度


        image_nowweather.setImageResource(DataAdapter.getIcon(m_nowWeather.getWid()));
        text_nowtemp.setText(m_nowWeather.getTemperature()+"\u2103");
        text_nowweather.setText(m_nowWeather.getWeather());
        text_nowdirection.setText(m_nowWeather.getDirct());
        text_nowpower.setText(m_nowWeather.getPower());
        text_nowquality.setText(m_nowWeather.getAqi());
        text_city.setText(m_cityEdit.getText().toString().trim());
        text_humidity.setText(m_nowWeather.getHumidity());



    }//end of displayNowWeather

    /*
        解析数据
        in:m_data
        out:m_datalist,m_nowWeather
     */
    private boolean parseJsonData(){
        try {
            JSONObject object=new JSONObject(m_data);
            if (object.getInt("error_code")!=0){
                System.out.println(object.get("error_code")+":"+object.get("reason"));
                return false;
            }

            m_datalist=new ArrayList<Weather>();
            //实时数据
            m_nowWeather=new Weather();
            JSONObject nowObject=object.getJSONObject("result").getJSONObject("realtime");
            m_nowWeather.setTemperature(nowObject.getString("temperature"));
            m_nowWeather.setWid(nowObject.getString("wid"));
            m_nowWeather.setWeather(nowObject.getString("info"));
            m_nowWeather.setPower(nowObject.getString("power"));
            m_nowWeather.setAqi(nowObject.getString("aqi"));
            m_nowWeather.setDirct(nowObject.getString("direct"));
            m_nowWeather.setHumidity(nowObject.getString("humidity"));


            //未来5天的天气
            JSONArray futureArray=object.getJSONObject("result").getJSONArray("future");
            for (int i=0;i<futureArray.length();i++){
                Weather tempWeather=new Weather();
                JSONObject weatherObject=futureArray.getJSONObject(i);
                tempWeather.setDatastr(weatherObject.getString("date"));
                tempWeather.setTemperature(weatherObject.getString("temperature"));
                tempWeather.setWid(weatherObject.getJSONObject("wid").getString("day"));
                tempWeather.setWeather(weatherObject.getString("weather"));
                tempWeather.setDirct(weatherObject.getString("direct"));

                m_datalist.add(te