android天气实战

news2025/1/12 12:25:58

页面绘制

问题1、下拉框需要背景为透明

我懒得写全部省份就写了5个所以不需要往下

图标准备

iconfont-阿里巴巴矢量图标库几坤年没来这了好怀念啊，图标库选择下雨的图标等

准备网络请求

0、API接口准备

api免费七日天气接口API 未来一周天气预报api (tianqiapi.com)

1、添加网络请求权限

2、网络请求工具类

package com.example.weather.Unil;
import android.util.Log;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Util {
    //ctrl+shift+u全部大写/小写
    public static final String URL_WEATHER_WITH="http://v1.yiketianqi.com/free/week?unescape=1&appid=00000000&appsecret=00000";

    public static String doGet(String urlStr){
        String result="";
        InputStreamReader inputStreamReader = null;
        //链接网路
        HttpURLConnection connection=null;
        BufferedReader bufferedReader=null;
        try {
            URL url = new URL(urlStr);
            connection =(HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setConnectTimeout(5000);
            //从连接中读取数据
            InputStream inputStream = connection.getInputStream();
            //二进制转换（数据流加工）
            inputStreamReader = new InputStreamReader(inputStream);
            bufferedReader = new BufferedReader(inputStreamReader);
            String line="";
            StringBuilder stringBu=new StringBuilder();
            while((line = bufferedReader.readLine())!=null){
                //读取一行拼接
                stringBu.append(line);
            }
            result=stringBu.toString();

        } catch (Exception e) {
            throw new RuntimeException(e);
        }finally {
            //关闭流们
            if (connection!=null)
                connection.disconnect();
            if (inputStreamReader!=null) {
                try {
                    inputStreamReader.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            if (bufferedReader!=null) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
        }
        return result;
    }
    public static String getWeatherOfCity(String city){
        //拼接天气url
        String weatherUrl=URL_WEATHER_WITH+"&city"+city;
        Log.d("gh", "-------------"+weatherUrl);
        String weatherResult = doGet(weatherUrl);
        Log.d("gh", "-------------"+weatherResult);
        return weatherResult;
    }
}

3、main中调用

4、查看日志成功

数据解析并渲染（JSON)

package com.example.weather;

import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.TextView;

import androidx.activity.EdgeToEdge;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.AppCompatSpinner;
import androidx.core.graphics.Insets;
import androidx.core.view.ViewCompat;
import androidx.core.view.WindowInsetsCompat;
import androidx.recyclerview.widget.RecyclerView;

import com.example.weather.Unil.Util;
import com.example.weather.bean.DayWeather;
import com.example.weather.bean.WeatherBean;
import com.google.gson.Gson;

public class MainActivity extends AppCompatActivity {
    private AppCompatSpinner  mSpinner;
    private ArrayAdapter<String>  mspAdapter;
    private String[] mCities;
    private TextView tvWendu,tvxiangxi,tvkongqi,tvWindPos,tvWindSpeed;
    private ImageView imageView;
    private RecyclerView rlFutureWeather;

    private Handler myHandler=new Handler(Looper.myLooper()){
        @Override
        public void handleMessage(@NonNull Message msg) {
            //ctrl+o重写方法
            //传递给父
            super.handleMessage(msg);
            if (msg.what==0){
                String weather=(String) msg.obj;
                Gson gson = new Gson();
                //解析完成
                WeatherBean weatherBean = gson.fromJson(weather, WeatherBean.class);
                updateUiOfWeather(weatherBean);
               // Log.e("gh", "-----------------------"+weatherBean.toString());
            }

        }
    };

    private void updateUiOfWeather(WeatherBean weatherBean) {
        if (weatherBean==null)
            return;
        DayWeather toDayWeather = weatherBean.getData().get(0);
        if (toDayWeather==null)
            return;
        tvWendu.setText((Integer.parseInt(toDayWeather.getTemDay())+Integer.parseInt(toDayWeather.getTemNight()))/2+"");
        tvxiangxi.setText(toDayWeather.getWea()+' '+"最高"+toDayWeather.getTemDay()+"° "+"最低"+toDayWeather.getTemNight()+"°");
        tvkongqi.setText(Integer.parseInt(toDayWeather.getTemDay())+20+"");
        tvWindPos.setText(toDayWeather.getWin());
        tvWindSpeed.setText(toDayWeather.getWinSpeed());
        getImgResOfWeather(toDayWeather.getWeaImg());
    }

    private void getImgResOfWeather(String weaStr) {
//        固定9种类型(您也可以根据wea字段自己处理):
//        xue、lei、shachen、wu、yun、yu、yin、qing
        int result=0;
        switch (weaStr){
            case "qing":result=R.drawable.qingtian;break;
            case "yun":result=R.drawable.duoyun;break;
            case "shachen":result=R.drawable.shanchenbao;break;
            case "wu":result=R.drawable.wutian;break;
            case "xue":result=R.drawable.xuetian;break;
            case "yin":result=R.drawable.yintian;break;
            case "yu":result=R.drawable.yutian;break;
            case "lei":result=R.drawable.yutian;break;
        }
        imageView.setImageResource(result);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        initView();
    }
    //这里需要用下来关联自定义的布局怎么关联呢
    //需要Adapter
    private void initView(){
        mSpinner = findViewById(R.id.spinner);
        mCities=getResources().getStringArray(R.array.cities);//关联到下列边表
        mspAdapter = new ArrayAdapter<>(this, R.layout.spitem,mCities);//
        mSpinner.setAdapter(mspAdapter);
        mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                //选中城市后会开始获取天气
                String selectCity=mCities[position];
                getWeatherOfCity(selectCity);

            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
        tvWendu=findViewById(R.id.wendu);
        tvkongqi=findViewById(R.id.kongqi);
        tvxiangxi=findViewById(R.id.juti);
        tvWindPos=findViewById(R.id.windpos);
        tvWindSpeed=findViewById(R.id.windSpeed);
        imageView=findViewById(R.id.imageView);
        rlFutureWeather=findViewById(R.id.scrollView2);
    }

    private void getWeatherOfCity(String selectCity) {
        //开启子线程请求与网络（必须再子线程）
        new Thread(new Runnable() {
            @Override
            public void run() {
                //请求网络
                String weatherResult = Util.getWeatherOfCity(selectCity);
               // Log.e("gh", "-----------------------"+selectCity);
                //使用handle将数据传递给主线程
                //从消息池获取消息效率更高
                Message msg= Message.obtain();
                msg.what=0;
                msg.obj=weatherResult;
                myHandler.sendMessage(msg);
            }
        }).start();
    }
}