Android 9,API 28上使用JSON的HttpURLConnection[重复]

Question

我试图在Android9，API28中使用HttpURLConnection。它可以在Android8.0.0、API26上工作，但不能在API28上工作。

            JSONObject jsonObject = new JSONObject();
            jsonObject.accumulate("name", name);
            String json = jsonObject.toString();

            URL url = new URL("http://website_link");
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setDoOutput(true);
            urlConnection.setRequestMethod("POST");
            urlConnection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");

            OutputStream os = urlConnection.getOutputStream();
            os.write(json.getBytes("UTF-8"));
            os.close();

            InputStream inputStream = new BufferedInputStream(urlConnection.getInputStream());
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("utf-8")), 8);
            String line;
            json = "";

            while ((line = reader.readLine()) != null) {
                json += line;
            }

            inputStream.close();

            jsonObject = new JSONObject(json);

            inputStream.close();
            urlConnection.disconnect();

            ...

Answer 1

尝试添加manifest.xml

cleartextTrafficPermitted="true"

它看起来像这样，如何允许所有网络连接类型HTTP和HTTPS在Android（9）馅饼？