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Processing can't find a callback function from a save dialog

For whatever reason, Processing does not seem to find the callback function after I select a file using selectOutput(). Here is the part of my code where I am trying to save a file:
void saveProjectDialog() { // Shows a save file dialog
JSONObject header = new JSONObject();
header.setString("name", proj_name);
selectOutput(getLang("SaveDialog"), "saveProject");
}
void saveProject(File selection) { // Save file dialog callback
if (selection == null) {
println("Save dialog was closed, canceled save.");
} else {
println("Saving to " + selection.getAbsolutePath());
saveJSONArray(project, selection.getAbsolutePath());
println("Construction saved!");
}
}
When I select the path, this is printed out to the console:
saveProject() could not be found
What is wrong with my code?

Using this test sketch worked:
JSONArray project = new JSONArray();
String proj_name = "test";
void saveProjectDialog() { // Shows a save file dialog
JSONObject header = new JSONObject();
header.setString("name", proj_name);
selectOutput(getLang("SaveDialog"), "saveProject");
}
void saveProject(File selection) { // Save file dialog callback
if (selection == null) {
println("Save dialog was closed, canceled save.");
} else {
println("Saving to " + selection.getAbsolutePath());
saveJSONArray(project, selection.getAbsolutePath());
println("Construction saved!");
}
}
void setup(){
saveProjectDialog();
}
String getLang(String s){
return s;
}
Double check the values proj_name and getLang() result.

Iphone emoji Unicode decode issue for push notification dispatch by APNs

My web service publish push notification to APNs and APNs send to destination IOS device.
When apns contain Unicode emoji on alert body push notification and Iphone os can't decode my Unicode emoji '\uD83D\uDE0A' app already kill.
Push notification show same '\uD83D\uDE0A', No emoji shown on banner notification bar on top.
Android application works fine by GCM dispatches push notification But IOS not support.
Iphone-Ios supports only this format '\ue415'
Here code that from ActiveMQ subscribe chat payload get into web-service
public void onPublish(UTF8Buffer topic, Buffer msg, Runnable ack) {
try {
String body = msg.utf8().toString();
if (logger.isInfoEnabled()) {
logger.info("MQTT connection.listener.onPublish(), msg Received ["
+ body + "]");
}
if (body.contains("\"cmd\":\"chat\"")
&& body.contains("\"is_sender_msg\":true")) {
QueueMgr.addToChatQueue(body); //Changed true to false
}
else if(body.contains("\"cmd\":\"msg_seen\"")){
QueueMgr.addToChatReadSeenQueue(body);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
ack.run();
}
}
My code for create push notification on java
public static JSONObject constructePushJson(JSONObject jsonObject,String[] cloudkeyWithDevice) throws JSONException {
if(cloudkeyWithDevice[0] != null){
JSONObject pnAPIdata = new JSONObject();
if(cloudkeyWithDevice[1].equals("a") || cloudkeyWithDevice[1].equals("d")){
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_CMD, com.anyorg.constants.AppConstants.CMD_ANDROID_PUSH);
}
else{
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_CMD, com.anyorg.constants.AppConstants.CMD_IOS_PUSH);
}
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_APP_TOKEN, com.anyorg.constants.AppConstants.DEFAULT_APP_TOKEN);
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_DEVICE_TOKEN, cloudkeyWithDevice[0]);
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_USER_ID, jsonObject.getInt(com.anyorg.constants.AppConstants.FLD_TO_USER_ID));
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_DEVICE_ID, 0);
String alertMsg=StringEscapeUtils.unescapeJava(jsonObject.getString(com.anyorg.constants.AppConstants.FLD_BODY));
jsonObject.put(com.anyorg.constants.AppConstants.FLD_BODY,alertMsg);
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_ALERT_MSG, "AryaConnect: "+alertMsg);//(jsonObject.isNull("body")) ? jsonObject.getString("from_user_name")+": Sent a file" : jsonObject.getString("from_user_name")+": "+jsonObject.getString("body")
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_MSG, jsonObject);//jsonObject.getString(com.anyorg.constants.AppConstants.FLD_BODY)
pnAPIdata.put(com.anyorg.constants.AppConstants.FLD_CALLBACK_URL, callbackUrl);
pnAPIdata.put(com.anyorg.constants.AppConstants.MAC_ADDRESS_ID, jsonObject.getString("mobile_rec_id"));
return pnAPIdata;
}
else{
return null;
}
}
Publish to APNs code
public class ANSNotificationDispatcher implements NotificationDispatcher {
protected static final Logger logger = Logger
.getLogger(ANSNotificationDispatcher.class);
public static final String OS_NAME = AppConstants.OS_TYPE_IPHONE;
String keystore;
String password;
boolean production;
public ANSNotificationDispatcher() {
try {
keystore = AppConfig.getAPNKeystore();
password = AppConfig.getAPNKeystorePassword();
PushyAPNMgr.init(keystore, password, AppConfig.isAPNProdcution());
} catch (Throwable e) {
e.printStackTrace();
}
}
private void push(Payload payload, String token, String userId,
String deviceId) throws ConfigurationException,
DeviceUnregisteredException {
// QueueManager.addToIOsQueue(payLoad, token, userId, ivUserDeviceId);
long stime = System.currentTimeMillis();
try {
PushyAPNMgr.push(token, payload.toString());
if (logger.isInfoEnabled())
logger.info("push(): APN PN userId [" + userId
+ "], device id [" + deviceId + "] payoad [" + payload
+ "] Response time ["
+ (System.currentTimeMillis() - stime) + "]ms");
} catch (Exception e) {
e.printStackTrace();
throw new ConfigurationException();
}
}
public static Payload createComplexPayload(JSONObject jsonObject) {
PushNotificationPayload complexPayload = null;
try {
complexPayload = createPayload(jsonObject);
String msg = Common.getStringAsNull(jsonObject,
AppConstants.FLD_MSG);
if (!Common.isEmpty(msg)) {
complexPayload.addCustomDictionary(AppConstants.FLD_MSG, msg);
}
if (logger.isInfoEnabled()) {
logger.info("createComplexPayloadV2(): payload ["
+ complexPayload.getPayload().toString() + "]");
}
} catch (JSONException e) {
e.printStackTrace();
}
return complexPayload;
}
public void dispatch(JSONObject jsonObject, String jsonData)
throws NotificationException, DeviceUnregisteredException,
MultipleRegistartionIdException, ConfigurationException {
String deviceToken = Common.getStringAsNull(jsonObject,
AppConstants.FLD_DEVICE_TOKEN);
if (Common.isEmpty(deviceToken)) {
logger.error("dispatch(): device token is null, cmd [" + jsonData
+ "]");
return;
}
Payload payload = createComplexPayload(jsonObject);
String userId = Common.getStringAsNull(jsonObject,
AppConstants.FLD_USER_ID);
String deviceId = Common.getStringAsNull(jsonObject,
AppConstants.FLD_DEVICE_ID);
push(payload, deviceToken, userId, deviceId);
}
public static void handleInvalidTokeException(String token) {
}
public static void handleDeviceUnregisteredException(String token) {
}
}
Ios push notification managed by Ios OS
My Apache Catalina log
I am a web service cloud developer faceing this issue last one days for only Ios app. So please, if some body have knowledge or done before. please advise and refer me some idea.
Emoji in my push notifications link.
https://mixpanel.com/help/questions/articles/how-do-i-send-custom-parameters-like-emoji-in-my-push-notifications
Thanks

Finally, APNs issue resolve in (Ios app) on java web service code by this Unicode encode and decode process. (unescapeJava and escapeJava) from lib commons-lang-2.6.jar and class org.apache.commons.lang.StringEscapeUtils
emojiBytes = alertMsg.getBytes("UTF-8"); text = new String(emojiBytes, "UTF-8");
private static PushNotificationPayload createPayload(JSONObject jsonObject)
throws JSONException {
String alertMsg = Common.getStringUnicodeAsNull1(jsonObject,
AppConstants.FLD_ALERT_MSG);
byte[] emojiBytes=null;
String text=null;
try {
emojiBytes = alertMsg.getBytes("UTF-8");
text = new String(emojiBytes, "UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//String emojiAsString = new String(emojiBytes, Charset.forName("UTF-8"));
//System.out.println("#####alertMsg: "+text);
Integer badgeCnt;
if (jsonObject.has(AppConstants.FLD_BADGE_CNT)){
badgeCnt = Common.getIntegerAsNull(jsonObject,
AppConstants.FLD_BADGE_CNT);
}else{
badgeCnt = AppConstants.VAL_ZERO;
}
PushNotificationPayload payload = createPayload(badgeCnt, text);
return payload;
}
String alertMsg = Common.getStringUnicodeAsNull1(jsonObject,
AppConstants.FLD_ALERT_MSG);
public static String getStringUnicodeAsNull1(JSONObject jsonObject,
String key) {
try {
if(jsonObject.isNull(key))
return null;
else
return StringEscapeUtils.unescapeJava(jsonObject.getString(key));
} catch (JSONException je) {
return null;
}
}
Respected sir and ma'am, If there is any other solution of java APNs emoji Unicode on IOS Push Notification.
Then please give me some hints.Thanks

you shouldn't need to mess about with html decoding. As you say the code point for smiling face is \u263A. In PHP you can represent that in a UTF8-encoded string as "\xE2\x98\xBA"
Lightning bolt (actually 'high voltage sign') is \u26A1 or "\xE2\x9A\xA1" in UTF-8.
Both these characters are present in some non-emoji fonts as regular Unicode symbols. You can see with:
<?php
header('Content-type: text/html; charset=utf-8');
echo "\xE2\x9A\xA1";
echo "\xE2\x98\xBA";
or other things...
for the googlers. json_encode() adds double \
$message = "\ue04a";
$body['aps'] = array(
'alert' => $message,
'sound' => 'default',
'type' => $type,
'param' => $param
);
$payload = json_encode($body);
$payload = str_replace("\", "\\", $payload);
Please check with this two way... i think this is helpfull for you.

Send a pdf on an default Email Client - Android Aplication [duplicate]

This question already has an answer here:
Android send mail with PDF file
(1 answer)
Closed 7 years ago.
I need send a PDF file attach on a message, I have a button that calls a function that open a Intent with message, email address and subject filled, but I need that the PDF file has been attached too.
This is my code and I can not find my error, someone can help me please?
public void initializeWebView() {
// Initialize the webview
webView.setResourceClient(new XWalkResourceClient(webView) {
#Override
public boolean shouldOverrideUrlLoading(XWalkView view, String stringUrl) {
if(stringUrl.equals(baseUrl)) {
return false;
}
// mailto links will be handled by the OS.
if (stringUrl.startsWith("mailto:")) {
Uri uri = Uri.parse(stringUrl);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
String fileName = "bouhnik.pdf";
String filePath = (Configuration.getMagazineAssetPath()).toString()+ File.separator + fileName;
Context c = getActivity().getApplicationContext();
File file = null;
FileOutputStream fos = null;
try {
InputStream is = c.getAssets().open(filePath);
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
fos = new FileOutputStream(file);
fos.write(buffer);
fos.close();
} catch (IOException e) {
Log.i("Ferrou",e.toString());
e.printStackTrace();
}
if (!file.exists() || !file.canRead()) {
return false;
}
intent.putExtra(intent.EXTRA_STREAM, file.getPath());
intent.setClassName("com.android.email", "com.android.mail.compose.ComposeActivity");
intent .putExtra(Intent.EXTRA_SUBJECT, "Subject");
WebViewFragment.this.startActivity(Intent.createChooser(intent, "Send email..."));
} else {
try {
URL url = new URL(stringUrl);
// We try to remove the referrer string to avoid passing it to the server in case the URL is an external link.
String referrer = "";
if (url.getQuery() != null) {
Map<String, String> variables = Configuration.splitUrlQueryString(url);
String finalQueryString = "";
for (Map.Entry<String, String> entry : variables.entrySet()) {
if (entry.getKey().equals("referrer")) {
referrer = entry.getValue();
} else {
finalQueryString += entry.getKey() + "=" + entry.getValue() + "&";
}
}
if (!finalQueryString.isEmpty()) {
finalQueryString = "?" + finalQueryString.substring(0, finalQueryString.length() - 1);
}
stringUrl = stringUrl.replace("?" + url.getQuery(), finalQueryString);
}
// Remove referrer from query string
if (!url.getProtocol().equals("file")) {
if (referrer.equals(WebViewFragment.this.getActivity().getString(R.string.url_external_referrer))) {
Uri uri = Uri.parse(stringUrl);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
WebViewFragment.this.startActivity(intent);
} else if (referrer.toLowerCase().equals(WebViewFragment.this.getActivity().getString(R.string.url_baker_referrer))) {
((IssueActivity) WebViewFragment.this.getActivity()).openLinkInModal(stringUrl);
return true;
} else {
return false;
}
} else {
stringUrl = url.getPath().substring(url.getPath().lastIndexOf("/") + 1);
int index = ((IssueActivity) WebViewFragment.this.getActivity()).getJsonBook().getContents().indexOf(stringUrl);
if (index != -1) {
Log.d(this.getClass().toString(), "Index to load: " + index + ", page: " + stringUrl);
((IssueActivity) WebViewFragment.this.getActivity()).getViewPager().setCurrentItem(index);
view.setVisibility(View.GONE);
} else {
// If the file DOES NOT exist, we won't load it.
File htmlFile = new File(url.getPath());
if (htmlFile.exists()) {
return false;
}
}
}
} catch (MalformedURLException | UnsupportedEncodingException ex) {
Log.d(">>>URL_DATA", ex.getMessage());
}
}
return true;
}
});
// Set UI Client (Start stop animations)
webView.setUIClient(new XWalkUIClient(webView) {
#Override
public void onPageLoadStopped(XWalkView view, String url, LoadStatus status) {
if(!url.isEmpty() && status == LoadStatus.FINISHED) {
if(isUserVisible) {
webView.resumeTimers();
}else{
webView.pauseTimers();
}
}
}
});
webView.load(baseUrl, null);
}

Thank's so much for everyone!!
I solve my problem change the type of Intent to:
Intent emailIntent = new Intent(Intent.ACTION_SEND);
Because this is better to email commands, and I define a emailUri where:
emailUri = Uri.fromFile(file.getAbsoluteFile());
because this get a absolute path with a file inside, and when the email client open, it open this file, not a path.
I add a type at my intent but I select the type of my attachment, so I define:
emailIntent.setType("application/pdf");
And finally:
emailIntent.putExtra(Intent.EXTRA_STREAM, uriMail);
startActivity(emailIntent);
It's works now!! Thanks :D

It looks like something is might be going wrong with your file path. Double check it. Then
1 - You need to add the package name of your application with context.getPackageName()
private String path = Environment.getExternalStorageDirectory().getPath() + context.getPackageName() + "books/"+fileName;
2 - Declare the permission inside your AndroidManifest.xml
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Thread contention in Asynctask

I'm having a thread contention issue when my program gets to executing an asynctask whose current purpose is to connect to an ftp server and based on a successful connection then make a get HTTP parsing request in order to access JSON data I need to write into a local SQLite database.
I'm slightly new in understanding thread contention but having read around particulalry this article I suspect it is a deadlock.
Below is my debug window which is called when I run my app. I'm doing so on a device and not an emulator:
Below is the asynctask code:
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
//pDialog = new ProgressDialog(AllProductsActivity.this);
//pDialog.setMessage("Loading products. Please wait...");
Log.i("LoadAllProducts", "LoadAllProducts - Loading products. Please wait...");
//pDialog.setIndeterminate(false);
//pDialog.setCancelable(false);
//pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
Log.i("LoadAllProducts", "URL: " + url_all_products);
ftpConnectLoginAndUpload = new FTPConnectLoginAndUpload();
if(ftpConnectLoginAndUpload.execute()) {
// Check your log cat for JSON response
Log.d("LoadAllProducts ", "About to execute JSONObject json = jParser.makeHttpRequest(url_all_products, \"GET\", params);");
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON response
Log.d("LoadAllProducts ", json.toString());
/*try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS); // products is a variable holding the value from the 2nd key-value pairing.
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
String price = c.getString("price");
String created_at = c.getString("created_at");
String updated_at = c.getString("updated_at");
Log.d("LoadAllProducts ", "JSON item var i.e. id:" + id);
Log.d("LoadAllProducts ", "JSON item var i.e. name:" + name);
Log.d("LoadAllProducts ", "JSON item var i.e. price:" + price);
Log.d("LoadAllProducts ", "JSON item var i.e. created_at:" + created_at);
Log.d("LoadAllProducts ", "JSON item var i.e. updated_at:" + updated_at);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}*/
} else {
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
Log.i("LoadAllProducts", "LoadAllProducts - dismiss the dialog after getting all products");
// updating UI from Background Thread
/*runOnUiThread(new Runnable() {
public void run() {
//Updating parsed JSON data into ListView
ListAdapter adapter = new SimpleAdapter(
AllProductsActivity.this, productsList,
R.layout.list_item, new String[] { TAG_PID,
TAG_NAME},
new int[] { R.id.pid, R.id.name });
// updating listview
setListAdapter(adapter);
}
});*/
}
}
Below is the FTP log in code:
//!< FTP Connect, Login And Upload
public class FTPConnectLoginAndUpload {
//!<
private void showServerReply(FTPClient ftpClient) {
String[] replies = ftpClient.getReplyStrings();
if (replies != null && replies.length > 0) {
for (String aReply : replies) {
System.out.println("---> showServerReply(FTPClient ftpClient) - SERVER: " + aReply);
}
}
}
//!<
public boolean execute() {
// Boston's FTP login credentials
String server = "XX.XXX.XXX.XX";
int port = 21;
String user = "XXXXXXXX_XXXXXX";
String pass = "XXXXXXXX";
// Time out period after connection attempt
int timeOut = 5000;
boolean ftpResult;
// FTPClient encapsulates all the functionality necessary to store and retrieve files from an FTP server
// This class takes care of all low level details of interacting with an FTP server and provides a convenient higher level interface
FTPClient ftpClient = new FTPClient();
// Execute FTP process
try {
// Set connection timeout in milliseconds
ftpClient.setConnectTimeout(timeOut);
// Sets the timeout in milliseconds to use when reading from the data connection.
ftpClient.setDataTimeout(timeOut);
// Connect using provided server and port numb
ftpClient.connect(server, port);
System.out.println("\n---> ftpClient.connect(server, port) has been executed.\n---> Server used was "
+ server + " and port number used was: " + port);
System.out.println("\n---> ftpClient.getReplyString() returns: " + ftpClient.getReplyString());
// Returns server reply
System.out.println("\n---> Server reply is as follows:");
showServerReply(ftpClient);
System.out.println("---> End of server reply");
// Get server reply code
int replyCode = ftpClient.getReplyCode();
System.out.println("\n---> ftpClient replyCode is: " + replyCode);
// Determine if a reply code is a positive completion response. All codes beginning with a 2 are positive completion responses.
// The FTP server will send a positive completion response on the final successful completion of a command.
if (!FTPReply.isPositiveCompletion(replyCode)) {
System.out.println("\n---> Operation failed. Server reply code: " + replyCode);
ftpResult = false;
return ftpResult;
} else {
System.out.println("\n---> Operation successful. Server reply code: " + replyCode);
// Attempt login
boolean success = ftpClient.login(user, pass);
System.out.println("\n---> ftpClient.login(user, pass); has been called.");
// Determine log in success
if (!success) {
System.out.println("\n ---> Unable to login to the server");
ftpResult = false;
return ftpResult;
} else {
System.out.println("\n---> Successfully logged into server");
ftpResult = true;
}
//
ftpClient.enterLocalPassiveMode();
// Show server reply after logging in
System.out.println("\n---> Server response after logging in is as follows:");
showServerReply(ftpClient);
System.out.println("---> End of server response after logging");
return ftpResult;
}
} catch (IOException ex) {
System.out.println("Error: " + ex.getMessage());
ex.printStackTrace();
ftpResult = false;
return ftpResult;
} finally {
try {
if (ftpClient.isConnected()) {
ftpClient.logout();
ftpClient.disconnect();
ftpResult = false;
return ftpResult;
}
} catch (IOException ex) {
ex.printStackTrace();
ftpResult = false;
return ftpResult;
}
}
}
}

NFC tag and php

I am new to NFC tags and am interested on how it work. I have bought a NFC tag and am able to write studentid to the tag. Now my problem is how to pass the student id to a php web service and check if this student has paid his/her meals before thy can proceed to the cafeteria when thy scan their student cards through my application.
Kindly anyone assist me on how i can do this. below is what i have done.
//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());
}
}

From my understanding, with android readers at a minimum, if the tag holds an URL, it will automatically load the browser and go to the URL (no asking if you want to open the app nor if you want to go to the URL). You should be able to just put the student_id as a query string and use it in a page.

Looks here to have an exemple of an NDEF implementation : Github repo
In the main activity you will have to modify the
#Override
public void ndefDataRead(String ndefData) {
demoTextView.setText(ndefData);
}
to call your getstudentinfo(String studID) methods and it might work