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

Question

这个问题在这里已有答案：

• How to allow all Network connection types HTTP and HTTPS in Android (9) Pie? 6个答案

我正在尝试在Android 9，API 28中使用HttpURLConnection。它适用于Android 8.0.0，API 26，但不适用于API 28。

            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();

            ...

我试图使用Log.d来查看没有执行的代码，我看到它停止在OutputStream os = urlConnection.getOutputStream();

你知道问题出在哪里吗？

Answer 1

试试这个添加Manifest.xml

cleartextTrafficPermitted="true"

它看起来像这个How to allow all Network connection types HTTP and HTTPS in Android (9) Pie?

Answer 2

这是因为Apache HTTP客户端折旧，所以在标记中添加以下行。

<uses-library android:name="org.apache.http.legacy" android:required="false"/>