Xamarin | Simple X Answer

Performing OCR for Android in Xamarin using Computer Vision API

January 2, 2017June 4, 2017 - by jkala - Leave a Comment

Performing OCR for Android in Xamarin using Computer Vision API Step 1. Obtain an API Key by going to the following page and registering https://www.microsoft.com/cognitive-services/en-us/computer-vision-api for Starters, the free edition …

Xamarin

Send email with attachment in Xamarin

August 22, 2016August 22, 2016 - by jkala - Leave a Comment

Send email with attachment in Xamarin Here’s the solution to send an email using the MailKit library, and ensure the email gets sent in the DEBUG and RELEASE modes.

public async Task SendMail() {

 var message = new MimeMessage();
 message.From.Add(new MailboxAddress("Pablo", "pablo@gmail.com"));
 message.To.Add(new MailboxAddress("Julio", "julio@hotmail.com"));
 message.Subject = "We keep spending most of our lives living in the gangsta's paradise";

 // create our message text, just like before (except don't set it as the message.Body)
 var body = new TextPart("plain") {
  Text = "Hi there, this is a body of the message."
 };

 MemoryStream myImageStream = convertBMPImageToStream(bmpImage);

 var attachment = new MimePart("image", "jpg") {
  ContentObject = new ContentObject(myImageStream, ContentEncoding.Default),
   ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
   ContentTransferEncoding = ContentEncoding.Base64,
   FileName = "attachedImage.jpg",
 };

 // now create the multipart/mixed container to hold the message text and the
 // image attachment
 var multipart = new Multipart("mixed");
 multipart.Add(body);
 multipart.Add(attachment);

 message.Body = multipart;

 using(var client = new SmtpClient()) {
  client.Connect("smtp.gmail.com", 587, false);

  // Note: since we don't have an OAuth2 token, disable
  // the XOAUTH2 authentication mechanism.
  client.AuthenticationMechanisms.Remove("XOAUTH2");

  // Note: only needed if the SMTP server requires authentication
  client.Authenticate("gmailUsername", "gmailpassword");

  try {
   await client.SendAsync(message);
  } catch (SmtpCommandException ex) {
   Console.WriteLine("Error sending message: {0}", ex.Message);
   Console.WriteLine("\tStatusCode: {0}", ex.StatusCode);
   switch (ex.ErrorCode) {
    case SmtpErrorCode.RecipientNotAccepted:
     Console.WriteLine("\tRecipient not accepted: {0}", ex.Mailbox);
     break;
    case SmtpErrorCode.SenderNotAccepted:
     Console.WriteLine("\tSender not accepted: {0}", ex.Mailbox);
     break;
    case SmtpErrorCode.MessageNotAccepted:
     Console.WriteLine("\tMessage not accepted.");
     break;
   }
  } catch (SmtpProtocolException ex)
  Console.WriteLine("Protocol error while sending message: {0}", ex.Message);

  client.Disconnect(true);
 }
}

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

public async Task SendMail() {

var message = new MimeMessage();

message.From.Add(new MailboxAddress("Pablo", "pablo@gmail.com"));

message.To.Add(new MailboxAddress("Julio", "julio@hotmail.com"));

message.Subject = "We keep spending most of our lives living in the gangsta's paradise";

// create our message text, just like before (except don't set it as the message.Body)

var body = new TextPart("plain") {

Text = "Hi there, this is a body of the message."

};

MemoryStream myImageStream = convertBMPImageToStream(bmpImage);

var attachment = new MimePart("image", "jpg") {

ContentObject = new ContentObject(myImageStream, ContentEncoding.Default),

ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),

ContentTransferEncoding = ContentEncoding.Base64,

FileName = "attachedImage.jpg",

};

// now create the multipart/mixed container to hold the message text and the

// image attachment

var multipart = new Multipart("mixed");

multipart.Add(body);

multipart.Add(attachment);

message.Body = multipart;

using(var client = new SmtpClient()) {

client.Connect("smtp.gmail.com", 587, false);

// Note: since we don't have an OAuth2 token, disable

// the XOAUTH2 authentication mechanism.

client.AuthenticationMechanisms.Remove("XOAUTH2");

// Note: only needed if the SMTP server requires authentication

client.Authenticate("gmailUsername", "gmailpassword");

try {

await client.SendAsync(message);

} catch (SmtpCommandException ex) {

Console.WriteLine("Error sending message: {0}", ex.Message);

Console.WriteLine("\tStatusCode: {0}", ex.StatusCode);

switch (ex.ErrorCode) {

case SmtpErrorCode.RecipientNotAccepted:

Console.WriteLine("\tRecipient not accepted: {0}", ex.Mailbox);

break;

case SmtpErrorCode.SenderNotAccepted:

Console.WriteLine("\tSender not accepted: {0}", ex.Mailbox);

break;

case SmtpErrorCode.MessageNotAccepted:

Console.WriteLine("\tMessage not accepted.");

break;

}

} catch (SmtpProtocolException ex)

Console.WriteLine("Protocol error while sending message: {0}", ex.Message);

client.Disconnect(true);

}

…

Xamarin

Expand and Collapse EditText in Xamarin Android

August 16, 2016June 4, 2017 - by jkala - Leave a Comment

Expand and Collapse EditText in Xamarin Android For One of my apps I needed to create an icon, which upon being clicked on it needed to expand and allow users …

Xamarin

How to send an email with an attachment using SMTP

June 26, 2016June 26, 2016 - by jkala - Leave a Comment

How to send an email with an attachment in Xamarin First and foremost, allow me note that 80% of the answers I found on the internet for this particular task …

Xamarin

Custom Navigation Bar in Xamarin

September 10, 2015September 12, 2015 - by jkala - Leave a Comment

Set up a custom navigation bar in Xamarin I ran into a problem where I wanted to load a custom navigation bar bar using Xamarin. Here’s the solution I used: …