android天气预报代码

以下是一个简单的Android天气预报应用程序示例，使用了OpenWeatherMap API获取天气数据：

1. 创建一个新的Android项目，并在AndroidManifest.xml文件中添加以下权限：

<uses-permission android:name="android.permission.INTERNET" />

2. 在build.gradle文件中添加以下依赖项：

implementation 'com.squareup.okhttp3:okhttp:4.9.1'
implementation 'com.squareup.okio:okio:2.9.0'
implementation 'com.google.code.gson:gson:2.8.6'

3. 在activity_main.xml文件中添加以下视图：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    android:orientation="vertical">

    <EditText
        android:id="@+id/edit_text_city"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter city name" />

    <Button
        android:id="@+id/btn_get_weather"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Get Weather" />

    <TextView
        android:id="@+id/text_view_weather"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="20sp" />

</LinearLayout>

4. 在MainActivity.java文件中添加以下代码：

import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import com.google.gson.Gson;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private EditText editTextCity;
    private Button btnGetWeather;
    private TextView textViewWeather;

    private OkHttpClient client;
    private Gson gson;
    private Handler handler;

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

        editTextCity = findViewById(R.id.edit_text_city);
        btnGetWeather = findViewById(R.id.btn_get_weather);
        textViewWeather = findViewById(R.id.text_view_weather);

        client = new OkHttpClient();
        gson = new Gson();
        handler = new Handler(Looper.getMainLooper());

        btnGetWeather.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String city = editTextCity.getText().toString();
                if (city.isEmpty()) {
                    return;
                }
                getWeather(city);
            }
        });
    }

    private void getWeather(final String city) {
        Request request = new Request.Builder()
                .url("https://api.openweathermap.org/data/2.5/weather?q=" + city + "&appid={your_api_key}")
                .build();
        client.newCall(request).enqueue(new com.squareup.okhttp.Callback() {
            @Override
            public void onFailure(Request request, IOException e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        textViewWeather.setText("Failed to fetch weather data");
                    }
                });
            }

            @Override
            public void onResponse(Response response) throws IOException {
                if (!response.isSuccessful()) {
                    onFailure(null, null);
                    return;
                }
                final String json = response.body().string();
                final WeatherData weatherData = gson.fromJson(json, WeatherData.class);
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        textViewWeather.setText(String.format("Temperature in %s: %.1f°C", city, weatherData.main.temp - 273.15));
                    }
                });
            }
        });
    }

    private static class WeatherData {
        MainData main;

        private static class MainData {
            double temp;
        }
    }
}

其中，{your_api_key}应替换为您的OpenWeatherMap API密钥。