android天气实战

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urlString 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()){@Overridepublic 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、qingint 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);}@Overrideprotected 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Adapterprivate 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() {@Overridepublic 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);}@Overridepublic 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() {@Overridepublic 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();}
}