Develop Reference

OpenCV face recognition with Android

I am very new to android, as I got a project for maintenance. I completed other part of the project like authentication, token setting etc... In that face recognition is used to identify the person. Previously it was working fine and taken images, trained with it and recognized the person.(Obviously not done by me :)). Now it throws error as
Add Person ActivityCvException [org.opencv.core.CvException:
cv::Exception:
/build/master_pack-android/opencv/modules/core/src/matrix.cpp:1047:
error: (-13) The matrix is not continuous, thus its number of rows can
not be changed in function cv::Mat cv::Mat::reshape(int, int) const
Code sample is as follows
public void training() {
Thread thread;
try{
PreferenceManager.setDefaultValues(getApplicationContext(), R.xml.preferences, false);
}catch (Exception e){
AddPersonActivity.this.runOnUiThread(new Runnable() {
public void run() {
WriteLog("Add Person Activity" +e.fillInStackTrace());
errorAlert("Add Person Activity" +e.fillInStackTrace());
VolleyHelper.progressDialog.dismiss();
}
});
}
WriteLog("training 1 ");
final Handler handler = new Handler(Looper.getMainLooper());
thread = new Thread(new Runnable() {
public void run() {
if (!Thread.currentThread().isInterrupted()) {
try {
WriteLog("training 2 ");
PreProcessorFactory ppF = new PreProcessorFactory(AddPersonActivity.this);
PreferencesHelper preferencesHelper = new PreferencesHelper(AddPersonActivity.this);
String algorithm = preferencesHelper.getClassificationMethod();
FileHelper fileHelper = new FileHelper();
fileHelper.createDataFolderIfNotExsiting();
final File[] persons = fileHelper.getTrainingList();
if (persons.length > 0) {
Recognition rec = RecognitionFactory.getRecognitionAlgorithm(getApplicationContext(), Recognition.TRAINING, algorithm);
for (File person : persons) {
if (person.isDirectory()) {
File[] files = person.listFiles();
int counter = 1;
for (File file : files) {
if (FileHelper.isFileAnImage(file)) {
Mat imgRgb = Imgcodecs.imread(file.getAbsolutePath());
Imgproc.cvtColor(imgRgb, imgRgb, Imgproc.COLOR_BGRA2RGBA);
Mat processedImage = new Mat();
imgRgb.copyTo(processedImage);
List<Mat> images = ppF.getProcessedImage(processedImage, PreProcessorFactory.PreprocessingMode.RECOGNITION);
if (images == null || images.size() > 1) {
continue;
} else {
processedImage = images.get(0);
}
if (processedImage.empty()) {
continue;
}
String[] tokens = file.getParent().split("/");
final String name = tokens[tokens.length - 1];
for (int i = 0; i < files.length; i++) {
File myfile = new File(person +
"\\" + files[i].getName());
String long_file_name = files[i].getName();
System.out.println(long_file_name);
System.out.print(long_file_name);
myfile.renameTo(new File(person +
"\\" + long_file_name + "_101" + ".png"));
}
WriteLog("training 3 ");
MatName m = new MatName("processedImage", processedImage);
fileHelper.saveMatToImage(m, FileHelper.DATA_PATH);
rec.addImage(processedImage, name, false);
counter++;
}
}
}
}
try {
if (rec.train()) {
if (zipFileAtPath("/storage/emulated/0/Pictures/facerecognition/training/" + lcode, "/storage/emulated/0/Pictures/facerecognition/data/SVM/" + lcode + ".zip")) {
WriteLog("training 4 ");
if (zipFileAtPath("/storage/emulated/0/Pictures/facerecognition/data/SVM", "/storage/emulated/0/Pictures/facerecognition/" + "SVM_" + lcode + ".zip")) {
WriteLog("training 5 ");
fileupload(getintent.getStringExtra("lcode"));
} else {
Toast.makeText(getApplicationContext(), "No Face Recognised", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(), "No Face Recognised", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(), "Try Again", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
WriteLog("Add Person Activity" +e.fillInStackTrace());
errorAlert("Add Person Activity" +e.fillInStackTrace());
}
handler.post(new Runnable() {
#Override
public void run() {
}
});
} else {
Thread.currentThread().interrupt();
}
} catch (Exception e) {
AddPersonActivity.this.runOnUiThread(new Runnable() {
public void run() {
VolleyHelper.progressDialog.dismiss();
WriteLog("Add Person Activity" +e.fillInStackTrace());
errorAlert("Add Person Activity" +e.fillInStackTrace());
}
});
}
}
}
});
thread.start();
}

The input image needs to be stored as a continuous block of bytes in memory. I came to a similar situation, particularly because Android (at least the version I tried) does not seem to store images continuously. 1) Check if the image is continuous using: inputImage.isContinuous(). It returns a bool. It should be true. 2) If the image is not continuous, you can create a copy of the image that it is by creating a clone of the image via inputImage.clone() . Behind the scenes, we are creating a deep copy of the input using the create method, that should guarantee that the new matrix is continuous.
//check image before continuing:
if ( !inputImage.isContinuous() ){
//if the image is not continuous, create a deep copy:
inputImage = inputImage.clone();
}

Android Printing using custom Print service

I am trying to write a custom android print service. I have followed the instruction mentioned in the below blog:
https://github.com/zaki50/MyPrintServiceProject
I am able to create a service, which executes a print job. But after the job doesn't print any thing. My question is, what is the localId that we should provide. Is it printer ip, name? Also is there any way to know why the print job doesn't work.
Basically the two methods that I am concerned about are adding onStartPrinterDiscovery and OnPrintJobQueue as mentioned below:
#Override
public void onStartPrinterDiscovery(List<PrinterId> priorityList) {
String str = Settings.Secure.getString(getBaseContext().getContentResolver(), "enabled_print_services");
Log.d("myprinter", "PrinterDiscoverySession#onStartPrinterDiscovery(priorityList: " + priorityList + ") called")
final List<PrinterInfo> printers = new ArrayList<>();
final PrinterId printerId = generatePrinterId("D8:49:2F:64:04:DB");
final PrinterInfo.Builder builder = new PrinterInfo.Builder(printerId, "D8:49:2F:64:04:DB", PrinterInfo.STATUS_IDLE);
PrinterCapabilitiesInfo.Builder capBuilder = new PrinterCapabilitiesInfo.Builder(printerId);
capBuilder.addMediaSize(PrintAttributes.MediaSize.NA_LETTER, true);
capBuilder.addMediaSize(PrintAttributes.MediaSize.NA_LETTER, false);
capBuilder.addResolution(new PrintAttributes.Resolution("resolutionId", "default resolution", 600, 600), true);
capBuilder.setColorModes(PrintAttributes.COLOR_MODE_COLOR | PrintAttributes.COLOR_MODE_MONOCHROME, PrintAttributes.COLOR_MODE_COLOR);
builder.setCapabilities(capBuilder.build());
printers.add(builder.build());
addPrinters(printers);
}
#Override
protected void onPrintJobQueued(PrintJob printJob) {
Log.d("myprinter", "queued: " + printJob.getId().toString());
printJob.start();
//printJob.complete();
final PrintDocument document = printJob.getDocument();
final FileInputStream in = new FileInputStream(document.getData().getFileDescriptor());
try {
final byte[] buffer = new byte[4];
#SuppressWarnings("unused")
final int read = in.read(buffer);
Log.d("myprinter", "first " + buffer.length + "bytes of content: " + toString(buffer));
} catch (IOException e) {
Log.d("myprinter", "", e);
} finally {
try {
in.close();
} catch (IOException e) {
assert true;
}
}
if( printJob.isStarted()){
printJob.complete();
}
}
My Question is what should be printerId(or localId). How do we know if the printjob has succeeded or failed

You can do detection of print job status with other methods in the class:
if( printJob.isStarted() ){
}
else if( printJob.isCompleted() ){
}
else if( printJob.isCancelled() ){
}
else if( printJob.isFailed() ){
}
In addition, the print service has it's own methods listed in the docs:
#Override
protected void onPrintJobQueued(PrintJob printJob) {
Log.d("printer", "queued: " + printJob.getId().toString());
printJob.start();
//...
printJob.complete();
}
#Override
protected void onRequestCancelPrintJob(PrintJob printJob) {
Log.d("printer", "canceled: " + printJob.getId().toString());
printJob.cancel();
}

Sending Email in Android using JavaMail API without using mailing APP

Sending Email in Android using JavaMail API without using the default/built-in app
Using this tutorial, I've loaded up the code into a sample android project and imported the libraries. Changed the parameters in the lines:
send.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
try {
GMailSender sender = new GMailSender("sender#gmail.com", "sender_password");
sender.sendMail("This is Subject", "This is Body", "sender#gmail.com", "recipient#gmail.com");
} catch (Exception e) {
Log.e("SendMail", e.getMessage(), e);
}
}
});
Wanted to test it out and in this code, the try block of code gets executed successfully when I press the button, but I don't receive the mail, nor do I get any errors. Since there's no readme or any guidelines as to how to use this code, I have no choice but to ask what I'm doing wrong.
Just to clear the confusion, I've put the senders email instead of sender#gmail.com, same goes for password and recipient#gmail.com.
I've also added the INTERNET permission to the manifest.

If you want to use mailgun instead you can do it like this:
public void sendEmailInBackground(final String subject, final String body, final String... toAddress) {
AsyncTask task = new AsyncTask() {
#Override
protected Object doInBackground(Object[] objects) {
String hostname = "smpt.mailgun.org";
int port = 25;
String login = "login";
String password = "password";
String from = "from#example.com";
AuthenticatingSMTPClient client = null;
try {
client = new AuthenticatingSMTPClient();
// optionally set a timeout to have a faster feedback on errors
client.setDefaultTimeout(10 * 1000);
// you connect to the SMTP server
client.connect(hostname, port);
// you say helo and you specify the host you are connecting from, could be anything
client.ehlo("localhost");
// if your host accepts STARTTLS, we're good everything will be encrypted, otherwise we're done here
if (client.execTLS()) {
client.auth(AuthenticatingSMTPClient.AUTH_METHOD.LOGIN, login, password);
checkReply(client);
client.setSender(from);
checkReply(client);
String address = "";
if (toAddress != null) {
for (String to : toAddress) {
if(to != null && to.length() > 0) {
client.addRecipient(to);
if (address.length() == 0) {
address += ",";
}
address += to;
}
}
}
if(address.length() == 0){
logger.warning("No address specified for mail message");
return null;
}
checkReply(client);
Writer writer = client.sendMessageData();
if (writer != null) {
SimpleSMTPHeader header = new SimpleSMTPHeader(from, address, subject);
writer.write(header.toString());
writer.write(body);
writer.close();
if (!client.completePendingCommand()) {// failure
throw new IOException("Failure to send the email " + client.getReply() + client.getReplyString());
}
} else {
throw new IOException("Failure to send the email " + client.getReply() + client.getReplyString());
}
} else {
throw new IOException("STARTTLS was not accepted " + client.getReply() + client.getReplyString());
}
} catch (IOException | NoSuchAlgorithmException | InvalidKeyException | InvalidKeySpecException e) {
logger.severe("Error sending email",e);
} finally {
if (client != null) {
try {
client.logout();
client.disconnect();
} catch (Exception e) {
logger.warning("Error closing email client: " + e.getMessage());
}
}
}
return null;
}
};
task.execute();
}
private static void checkReply(SMTPClient sc) throws IOException {
if (SMTPReply.isNegativeTransient(sc.getReplyCode())) {
throw new IOException("Transient SMTP error " + sc.getReplyString());
} else if (SMTPReply.isNegativePermanent(sc.getReplyCode())) {
throw new IOException("Permanent SMTP error " + sc.getReplyString());
}
}

Android How to Configure XMPP Conference - Chat room

I am developing one chat application , But it not work properly, giving different-differet error like 406 or 407 , So please advice me My following code for that is proper or not ,
First Login When Application Start :
public void LoginWithUser() {
Thread t = new Thread(new Runnable() {
#Override
public void run() {
SASLAuthentication.unregisterSASLMechanism("org.jivesoftware.smack.sasl.javax.SASLDigestMD5Mechanism");
SmackInitialization initialization = new SmackInitialization();
XMPPTCPConnectionConfiguration.Builder config = XMPPTCPConnectionConfiguration.builder();
config.setSecurityMode(ConnectionConfiguration.SecurityMode.disabled);
config.setServiceName(Constants.SERVICE);
config.setHost(Constants.HOST);
config.setPort(Constants.PORT);
config.setResource("myresource");
config.setDebuggerEnabled(true);
config.setKeystoreType("AndroidCAStore");
config.setConnectTimeout(100000);
try {
config.setUsernameAndPassword(getUserName(), password);
} catch (Exception e) {
e.getMessage();
}
Constants.connection = new XMPPTCPConnection(config.build()); //new XMPPConnection(Constants.connConfig);
try {
if (!Constants.connection.isConnected()) {
Constants.connection.connect();
}
Log.i("ChatActivity", "Connected to "
+ Constants.connection.getHost());
} catch (XMPPException ex) {
Log.e("ChatActivity",
"Failed to connect to " + Constants.connection.getHost());
Log.e("ChatActivity", ex.toString());
// setConnection(null);
} catch (IOException | SmackException e) {
e.printStackTrace();
Log.e("my error outer", e.getMessage() + " <- Understand 0 ? !!!");
}
try {
Log.d("chat : user name", getUserName());
try {
Log.d("chat : password", AESCrypt.decrypt(Constants.key_store_pair, enc_login_key));
} catch (Exception e) {
e.printStackTrace();
}
try {
SASLAuthentication.blacklistSASLMechanism("SCRAM-SHA-1");
Constants.connection.login(getUserName(), password);
Constants.connection.getServiceName();
Log.d("service name=", Constants.connection.getServiceName());
} catch (Exception e) {
e.printStackTrace();
Log.e("my error inner", e.getMessage() + " <- Understand 1 ? !!!");
}
Log.i("ChatActivity", "Logged in as "
+ Constants.connection.getUser());
Log.i("You are valid user",
"your Token is " + Constants.connection.getUser());
} catch (Exception ex) {
}
}
});
t.start();
}
It connected Successfully...
After when I creating New Conference Room at that time i register that conference room by calling following method :
private MultiUserChat createGroupChat(XMPPConnection connection,String room_id, String groupName, String registered_beam_iddd) throws XMPPException, SmackException {
// This code call when creating new conference room
Constants.mucM = MultiUserChatManager.getInstanceFor(connection); //new MultiUserChatManager(connection, registered_beam_iddd + "#" + groupName);
Constants.muc = Constants.mucM.getMultiUserChat(registered_beam_iddd + "#" + groupName);
if(Constants.connection.isConnected())
{
if(Constants.connection.isAuthenticated()) {
Constants.muc.createOrJoin(room_id + "#" + groupName); //
Form form = Constants.muc.getConfigurationForm();
Form submitForm = form.createAnswerForm();
Constants.muc.sendConfigurationForm(submitForm);
Log.d("Room Created : Name : " , room_id + "#" + groupName);
}
else
{
//Toast.makeText(getActivity(),"Authenicated false",Toast.LENGTH_LONG).show();
Log.d("ooo", "authentication failed in AddBeam");
}
}
else
{
Toast.makeText(getActivity(),"Connection Loss",Toast.LENGTH_LONG).show();
}
return Constants.muc;
//onesecond
}
When I Click on number of conference room ( listview ) , that means when i enter on any of my conference room , i call following method to join room and get history,
private MultiUserChat joinGroupChat(XMPPConnection connection, String room_id, String groupName, String registered_beam_iddd) throws XMPPException, SmackException {
// This code called when user enter in Chat-conference room
if (Constants.connection.isConnected()) {
if (Constants.muc == null) {
Constants.mucM = MultiUserChatManager.getInstanceFor(connection); //new MultiUserChatManager(connection, registered_beam_iddd + "#" + groupName);
Constants.muc = Constants.mucM.getMultiUserChat(registered_beam_iddd + "#" + groupName);
}
if (Constants.connection.isAuthenticated()) {
if (!Constants.muc.isJoined()) {
DiscussionHistory history = new DiscussionHistory();
history.setMaxStanzas(20);
Constants.muc.join(room_id + "#" + groupName, "password", history, Constants.connection.getPacketReplyTimeout()); // #conference.tubsystems.com
} else {
Log.d("joined: ", room_id + "#" + groupName);
}
} else {
Log.d("ooo", "authentication failed in AddBeam");
}
} else {
Toast.makeText(getApplicationContext(), "Connection Loss", Toast.LENGTH_LONG).show();
try {
Constants.connection.connect();
Log.i("ChatActivity", "Connected to "
+ Constants.connection.getHost());
} catch (Exception ex) {
Log.e("ChatActivity",
"Failed to connect to " + Constants.connection.getHost());
Log.e("ChatActivity", ex.toString());
// setConnection(null);
}
}
return Constants.muc;
//onesecond
}
For Sending Message to conference :
private void sendmessage(String text, String room) {
String to = beamId + "#"+groupname;
Message msg = new Message(to, Message.Type.groupchat);
msg.setBody(text);
if (Constants.connection != null) {
try {
Constants.connection.sendPacket(msg);
Log.d("Send to room : Name : ", to);
} catch (Exception e) {
Log.d("ooo", "msg exception" + e.getMessage());
}
messages.add(text);
msg_send_receive_val = 1;
new setListAdapter().execute();
}
}
But it giving Some time connection error , some time 406 or 407 error and when i first time enter in the conference room at that time only it display past history message and then automatically removed, and message also not sending some times and some times sending , i dont know what is problem , while sending message it giving 406-407 modify- not acceptable error and some times giving other error.
I don't know but anything missing in above code , or anything other required to configure conference room ? Please help me as much fast as possible.
Thanks in advance.

found index 0, size is 0 in android

"There i found index out of bound exception how can i solve???"
public static void addToCart() {
ArrayList<ItemData> iArr;
if (holdSelection != null) {
String categoryID = holdSelection.getCategoryID();
int position = categoriesAddedd.indexOf(holdSelection.getCategoryID());
int itemPosition =categoriesitemAddedd.indexOf(holdSelection.getItemData().get(0).getItemID());
if (!categoriesAddedd.contains(categoryID)) {
CategoryData data = new CategoryData();
data.setCategoryID(categoryID);
data.setCategoryName(holdSelection.getCategoryName());
data.setItemData(holdSelection.getItemData());
mAddedToCart.add(data);
categoriesAddedd.add(categoryID); categoriesitemAddedd.add(holdSelection.getItemData().get(0).getItemID());
Toast.makeText(mContext,R.string.Add_to_cart,Toast.LENGTH_SHORT).show();
} else {
if (position>=0) {
if(itemPosition>=0){
if(holdSelection.getItemData().get(0).getScaled()){
Toast.makeText(mContext,R.string.Already_in_cart,Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(mContext,R.string.Already_in_cart,Toast.LENGTH_SHORT).show();
}
}else{
try{
CategoryData data = mAddedToCart.get(position);
iArr = data.getItemData();
iArr.add(holdSelection.getItemData().get(0));
categoriesAddedd.add(categoryID);
categoriesitemAddedd.add(holdSelection.getItemData().get(0).getItemID());
Toast.makeText(mContext, R.string.Add_to_cart,Toast.LENGTH_SHORT).show();
}catch (Exception e) {
// TODO: handle exception
Toast.makeText(mContext, "There is " +e,Toast.LENGTH_SHORT).show();
System.out.println("Exception : "+ e.getMessage());
e.printStackTrace();
}
}
}
}
}
}

It's impossible to help without a minimum of (structured) information (and also without a Hello, please, tank you, polite words if you prefer).
First of all, you have to use the brackets to display code when you post, so your clean code should appear as follow :
public static void addToCart() {
ArrayList iArr;
if (holdSelection != null) {
String categoryID = holdSelection.getCategoryID();
int position = categoriesAddedd.indexOf(holdSelection.getCategoryID());
int itemPosition =categoriesitemAddedd.indexOf(holdSelection.getItemData().get(0).getItemID());
if (!categoriesAddedd.contains(categoryID)) {
CategoryData data = new CategoryData();
data.setCategoryID(categoryID);
data.setCategoryName(holdSelection.getCategoryName());
data.setItemData(holdSelection.getItemData());
mAddedToCart.add(data);
categoriesAddedd.add(categoryID);
categoriesitemAddedd.add(holdSelection.getItemData().get(0).getItemID());
Toast.makeText(mContext,R.string.Add_to_cart,Toast.LENGTH_SHORT).show();
} else {
if (position>=0) {
if(itemPosition>=0){
if(holdSelection.getItemData().get(0).getScaled()){
Toast.makeText(mContext,R.string.Already_in_cart,Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(mContext,R.string.Already_in_cart,Toast.LENGTH_SHORT).show();
}
}else{
try{
CategoryData data = mAddedToCart.get(position);
iArr = data.getItemData(); iArr.add(holdSelection.getItemData().get(0));
categoriesAddedd.add(categoryID);
categoriesitemAddedd.add(holdSelection.getItemData().get(0).getItemID());
Toast.makeText(mContext, R.string.Add_to_cart,Toast.LENGTH_SHORT).show();
}
catch (Exception e)
{ // TODO: handle exception Toast.makeText(mContext, "There is " +e,Toast.LENGTH_SHORT).show();
System.out.println("Exception : "+ e.getMessage()); e.printStackTrace();
}
}
}
}
}
}
then my first question will be : what is holdSelection related to?
Please add more parts of your code as your log (asked by Remees).
Alex.