android客户端通过HttpURLConnection传递给服务器一个参数,服务器端用flask接收这个参数,请给出代码

好的，以下是客户端和服务器端的示例代码：

客户端代码（Android端）：

String urlString = "http://your-server-url.com/your-endpoint";
String parameterName = "param";
String parameterValue = "value";

try {
    URL url = new URL(urlString);
    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
    urlConnection.setRequestMethod("POST");
    urlConnection.setDoOutput(true);
    OutputStream outputStream = urlConnection.getOutputStream();
    BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
    String data = URLEncoder.encode(parameterName, "UTF-8") + "=" + URLEncoder.encode(parameterValue, "UTF-8");
    bufferedWriter.write(data);
    bufferedWriter.flush();
    bufferedWriter.close();
    outputStream.close();

    int responseCode = urlConnection.getResponseCode();
    Log.i(TAG, "Response Code: " + responseCode);

    InputStream inputStream = urlConnection.getInputStream();
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
    String response = "";
    String line;
    while ((line = bufferedReader.readLine()) != null) {
        response += line;
    }
    bufferedReader.close();
    inputStream.close();

    Log.i(TAG, "Response: " + response);
} catch (IOException e) {
    e.printStackTrace();
}

服务器端代码（Flask端）：

from flask import Flask, request

app = Flask(__name__)

@app.route('/', methods=['POST'])
def handle_request():
    param_value = request.form.get('param')
    return 'Received parameter: ' + param_value

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080)

这个示例演示了一个POST请求，POST请求可以在请求体中传递数据，使用`HttpURLConnection`的`setDoOutput(true)`方法后，可以使用`getOutputStream()`方法获取输出流向请求体中写入数据。在服务器端，`Flask`的请求体信息存储在`request.form`中，可以使用`get`方法获取参数的值。

不过需要注意的是，`HttpURLConnection`在Android10及以上版本中已经被废弃，建议使用更为先进的`OkHttp`库替代，但是使用方法类似。