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我是 NFC 标签的新手，对它的工作原理很感兴趣。我已经购买了一个 NFC 标签，并且能够将 studentid 写入标签。现在我的问题是如何将学生 ID 传递给 php 网络服务，并在您通过我的应用程序扫描学生卡时检查该学生是否已经支付了他/她的餐费，然后您可以前往自助餐厅。

请任何人帮助我如何做到这一点。以下是我所做的。

//reading the tag
private String readText(NdefRecord record) throws UnsupportedEncodingException {

        byte[] payload = record.getPayload();

        // Get the Text Encoding
        String textEncoding = ((payload[0] & 128) == 0) ? "UTF-8" : "UTF-16";

        // Get the Language Code
        int languageCodeLength = payload[0] & 0063;

        // Get the Text
        return new String(payload, languageCodeLength + 1, payload.length - languageCodeLength - 1, textEncoding);
    }

    @Override
    protected void onPostExecute(String result) {
        if (result != null) {
        //show the student id in a textedit
            mTextView.setText(result);

            //pass variable to the server and get contents. I want to pass the student id to the method
            getstudentinfo(result);
        }
    }

      void getstudentinfo(String studID) {

        //get connection to the server using http request
        httpclient=new DefaultHttpClient();

        httppost= new HttpPost("http://myip/getStudentBl.php?studID="+ studID);

        try{

        response = getThreadSafeClient().execute(httppost);
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        final String response = httpclient.execute(httppost, responseHandler);

        //checking the response and info the user
        runOnUiThread(new Runnable() {
            public void run() {

            dialog.dismiss();
            }
            });

        //if the user is found
        if(response.equalsIgnoreCase("Student Found")){
            runOnUiThread(new Runnable() {
            public void run() {
            //Toast.makeText(MainActivity.this,"Saved Successfull", Toast.LENGTH_SHORT).show();
                stdBalance.setText("Student Balance " + response);
            }
            });
            //show the dashboard screen
            startActivity(new Intent(MainActivity.this, MainActivity.class));
        }else if(response.equalsIgnoreCase("No Record")){
            //show error results
            showAlert();
        }
        //end try catch
        }catch(Exception e){
            dialog.dismiss();
            System.out.println("Exception : " + e.getMessage());
            }

    }
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2 回答 2

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据我了解，至少使用 android 阅读器，如果标签包含 URL，它将自动加载浏览器并转到 URL（不询问您是否要打开应用程序，也不会询问您是否要转到 URL）。您应该能够将 student_id 作为查询字符串并在页面中使用它。

于 2014-01-15T14:46:05.317 回答
0

看起来这里有一个 NDEF 实现的例子：Github repo

在主要活动中，您必须修改

@Override
    public void ndefDataRead(String ndefData) {
    demoTextView.setText(ndefData);
}

调用您的 getstudentinfo(String studID) 方法，它可能会起作用

于 2015-04-29T11:20:21.193 回答