使用高德天气api写一个天气andorid的app

这里提供一个简单的使用高德天气API编写天气Android应用的步骤：

1. 注册高德开发者账号，创建应用并开通天气API服务。

2. 在Android Studio中创建一个新项目，并在AndroidManifest.xml文件中添加以下权限：

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

3. 在build.gradle文件的dependencies中添加以下依赖：

implementation 'com.amap.api:3dmap:7.7.0'
implementation 'com.amap.api:location:5.0.0'
implementation 'com.amap.api:search:7.7.0'

4. 在MainActivity中添加以下代码，获取当前定位信息：

public class MainActivity extends AppCompatActivity implements AMapLocationListener {
    private AMapLocationClient locationClient;
    private TextView tvCity;

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

        tvCity = findViewById(R.id.tv_city);

        //初始化定位
        locationClient = new AMapLocationClient(getApplicationContext());
        //设置定位回调监听
        locationClient.setLocationListener(this);
        //启动定位
        locationClient.startLocation();
    }

    @Override
    public void onLocationChanged(AMapLocation aMapLocation) {
        if (aMapLocation != null) {
            if (aMapLocation.getErrorCode() == 0) {
                //定位成功回调信息，设置相关消息
                tvCity.setText(aMapLocation.getCity());
            } else {
                //显示错误信息ErrCode是错误码，errInfo是错误信息，详见错误码表。
                Log.e("AmapError", "location Error, ErrCode:" + aMapLocation.getErrorCode() + ", errInfo:" + aMapLocation.getErrorInfo());
            }
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //销毁定位客户端，同时销毁本地定位服务。
        locationClient.onDestroy();
    }
}

5. 在高德开放平台中获取天气信息，可以使用以下代码：

public class WeatherUtil {
    private static final String URL = "https://restapi.amap.com/v3/weather/weatherInfo";
    private static final String KEY = "YOUR_KEY"; //替换成你的高德开放平台应用Key

    public static void getWeatherInfo(String city, Callback<WeatherResult> callback) {
        OkHttpClient client = new OkHttpClient.Builder().build();
        HttpUrl httpUrl = HttpUrl.parse(URL).newBuilder()
                .addQueryParameter("key", KEY)
                .addQueryParameter("city", city)
                .addQueryParameter("extensions", "base")
                .addQueryParameter("output", "json")
                .build();
        Request request = new Request.Builder()
                .url(httpUrl)
                .build();
        Call call = client.newCall(request);
        call.enqueue(callback);
    }
}

6. 在MainActivity中调用getWeatherInfo方法获取天气信息，并更新UI：

public class MainActivity extends AppCompatActivity implements AMapLocationListener {
    private AMapLocationClient locationClient;
    private TextView tvCity;
    private TextView tvWeather;

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

        tvCity = findViewById(R.id.tv_city);
        tvWeather = findViewById(R.id.tv_weather);

        //初始化定位
        locationClient = new AMapLocationClient(getApplicationContext());
        //设置定位回调监听
        locationClient.setLocationListener(this);
        //启动定位
        locationClient.startLocation();
    }

    @Override
    public void onLocationChanged(AMapLocation aMapLocation) {
        if (aMapLocation != null) {
            if (aMapLocation.getErrorCode() == 0) {
                //定位成功回调信息，设置相关消息
                tvCity.setText(aMapLocation.getCity());
                WeatherUtil.getWeatherInfo(aMapLocation.getCity(), new Callback<WeatherResult>() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        e.printStackTrace();
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        String json = response.body().string();
                        WeatherResult result = new Gson().fromJson(json, WeatherResult.class);
                        runOnUiThread(() -> tvWeather.setText(result.getWeather()));
                    }
                });
            } else {
                //显示错误信息ErrCode是错误码，errInfo是错误信息，详见错误码表。
                Log.e("AmapError", "location Error, ErrCode:" + aMapLocation.getErrorCode() + ", errInfo:" + aMapLocation.getErrorInfo());
            }
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //销毁定位客户端，同时销毁本地定位服务。
        locationClient.onDestroy();
    }
}

这样，我们就可以根据当前定位获取到城市，然后调用高德天气API获取天气信息，并将结果展示在UI上了。当然，还有很多细节需要处理，比如异常处理、UI美化等等，这里只是提供一个简单的示例供参考。