無法從php在android中檢索JSON數據

Question

我想獲取已登錄用戶的詳細信息。我在警報對話框中得到null或無值（變量-名稱）

我對所有事物都是陌生的，所以很抱歉，如果這個問題不值得，我已經嘗試找到解決方案，但是還沒有運氣，請提供幫助。

if (type.equals("linkuser")) {
        try {
            URL url = new URL(Link_url);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            OutputStream outputStream = httpURLConnection.getOutputStream();
            BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
            String post_data = URLEncoder.encode("user", "UTF-8") + "=" + URLEncoder.encode(user, "UTF-8");
            bufferedWriter.write(post_data);
            bufferedWriter.flush();
            bufferedWriter.close();
            outputStream.close();
            InputStream inputStream = httpURLConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
            String result = "";
            String line = "";
            while ((line = bufferedReader.readLine()) != null) {
                result += line;
            }
            bufferedReader.close();
            inputStream.close();
            httpURLConnection.disconnect();
            return result;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

Answer 1

Your php query is wrong
Initialize array first Note that $result is not your array

$menus= array();
while($row = mysqli_fetch_array($result )){
array_push($menus,
array('name'=>$row[0],
'ign'=>$row[1],
'email'=>$row[2]
));
}

mysqli_close($con);

echo json_encode(array("menu"=>$menus));