android studio天气预报代码和布局文件

以下是一个简单的 Android Studio 天气预报应用的代码和布局文件，仅供参考。

布局文件（activity_main.xml）：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/city_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="城市名称"
        android:layout_marginTop="50dp"
        android:layout_centerHorizontal="true"/>

    <ImageView
        android:id="@+id/icon"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_below="@+id/city_name"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"/>

    <TextView
        android:id="@+id/temperature"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="温度"
        android:layout_below="@+id/icon"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"/>

    <TextView
        android:id="@+id/weather_desc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:text="天气描述"
        android:layout_below="@+id/temperature"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"/>

    <Button
        android:id="@+id/get_weather_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="获取天气"
        android:layout_below="@+id/weather_desc"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"/>

</RelativeLayout>

Java 代码（MainActivity.java）：

import androidx.appcompat.app.AppCompatActivity;

import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

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

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

public class MainActivity extends AppCompatActivity {

    // 请在 https://openweathermap.org/ 上注册账号并获取 API Key
    private static final String API_KEY = "YOUR_API_KEY_HERE";
    private static final String API_URL = "https://api.openweathermap.org/data/2.5/weather?q=%s&units=metric&appid=%s";

    private TextView cityNameTextView, temperatureTextView, weatherDescTextView;
    private ImageView iconImageView;
    private Button getWeatherButton;

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

        cityNameTextView = findViewById(R.id.city_name);
        temperatureTextView = findViewById(R.id.temperature);
        weatherDescTextView = findViewById(R.id.weather_desc);
        iconImageView = findViewById(R.id.icon);
        getWeatherButton = findViewById(R.id.get_weather_btn);

        getWeatherButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                new WeatherTask().execute("Beijing");
            }
        });
    }

    private class WeatherTask extends AsyncTask<String, Void, JSONObject> {

        @Override
        protected JSONObject doInBackground(String... strings) {
            try {
                URL url = new URL(String.format(API_URL, strings[0], API_KEY));
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");

                BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                StringBuilder builder = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    builder.append(line);
                }
                reader.close();
                connection.disconnect();

                return new JSONObject(builder.toString());
            } catch (Exception e) {
                e.printStackTrace();
                return null;
            }
        }

        @Override
        protected void onPostExecute(JSONObject jsonObject) {
            if (jsonObject != null) {
                try {
                    cityNameTextView.setText(jsonObject.getString("name"));
                    temperatureTextView.setText(jsonObject.getJSONObject("main").getString("temp") + " ℃");
                    weatherDescTextView.setText(jsonObject.getJSONArray("weather").getJSONObject(0).getString("description"));

                    int iconId = getResources().getIdentifier("icon_" + jsonObject.getJSONArray("weather").getJSONObject(0).getString("icon"), "drawable", getPackageName());
                    iconImageView.setImageResource(iconId);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

这个应用利用了 OpenWeatherMap 的 API 来获取天气数据。请注意，在代码中需要替换 `API_KEY` 为你自己的 API Key。