I have seen multiple threads in this site discussing about sending email with attachments in android. I tried every methods discussed here, here and here.
I am creating a csv file via code and saving this file to android internal storage. Then I want to send this file as attachment in an email. Well, the email is being sent, I am getting it without attachment. This is what I have done.
String columnString = "\"Person\",\"Gender\",\"Street1\",\"PostOfice\",\"Age\"";
String dataString = "\"" + currentUser.userName +"\",\"" + currentUser.gender + "\",\"" + currentUser.street1 + "\",\"" + currentUser.poNumber.toString() + "\",\"" + currentUser.age.toString() + "\"";
String combinedString = columnString + "\n" + dataString;
File file = new File(this.getCacheDir()+ File.separator + "Data.csv");
try {
FileOutputStream out = new FileOutputStream(file);
out.write(combinedString.getBytes());
out.close();
} catch (IOException e) {
Log.e("BROKEN", "Could not write file " + e.getMessage());
}
Uri u1 = Uri.fromFile(file);
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Person Details");
sendIntent.putExtra(Intent.EXTRA_STREAM, u1);
sendIntent.setType("text/richtext");
startActivity(sendIntent);
I tried changing mime settings to "text/html" and "text/richtext" etc. But no luck yet. Can anyone tell me what I am doing wrong?
Thanks for everyone who tried to help..After taking a full day I have send an email from my app with attachment..This is the working code..
String columnString = "\"PersonName\",\"Gender\",\"Street1\",\"postOffice\",\"Age\"";
String dataString = "\"" + currentUser.userName +"\",\"" + currentUser.gender + "\",\"" + currentUser.street1 + "\",\"" + currentUser.postOFfice.toString()+ "\",\"" + currentUser.age.toString() + "\"";
String combinedString = columnString + "\n" + dataString;
File file = null;
File root = Environment.getExternalStorageDirectory();
if (root.canWrite()){
File dir = new File (root.getAbsolutePath() + "/PersonData");
dir.mkdirs();
file = new File(dir, "Data.csv");
FileOutputStream out = null;
try {
out = new FileOutputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
out.write(combinedString.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Uri u1 = null;
u1 = Uri.fromFile(file);
Intent sendIntent = new Intent(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Person Details");
sendIntent.putExtra(Intent.EXTRA_STREAM, u1);
sendIntent.setType("text/html");
startActivity(sendIntent);
Also If you have mounted your phone SDCard in the machine , this code wont work. Only one can access SDCard at one time. So in that case unmount your SDCard from computer and try..Thanks to the guy who answered here..Also make sure you have bought permission to write to external Storage in your manifest file...
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
Hope it helps someone...Thanks for everyone who tried to help..
This Code will help you out
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonSend = (Button) findViewById(R.id.buttonSend);
textTo = (EditText) findViewById(R.id.editTextTo);
textSubject = (EditText) findViewById(R.id.editTextSubject);
textMessage = (EditText) findViewById(R.id.editTextMessage);
buttonSend.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
String to = textTo.getText().toString();
String subject = textSubject.getText().toString();
String message = textMessage.getText().toString();
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("plain/text");
File data = null;
try {
Date dateVal = new Date();
String filename = dateVal.toString();
data = File.createTempFile("Report", ".csv");
FileWriter out = (FileWriter) GenerateCsv.generateCsvFile(
data, "Name,Data1");
i.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(data));
i.putExtra(Intent.EXTRA_EMAIL, new String[] { to });
i.putExtra(Intent.EXTRA_SUBJECT, subject);
i.putExtra(Intent.EXTRA_TEXT, message);
startActivity(Intent.createChooser(i, "E-mail"));
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
public class GenerateCsv {
public static FileWriter generateCsvFile(File sFileName,String fileContent) {
FileWriter writer = null;
try {
writer = new FileWriter(sFileName);
writer.append(fileContent);
writer.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally
{
try {
writer.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return writer;
}
}
Add this line in AndroidManifest.xml file:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission
Try
sendIntent.setType("message/rfc822");
For internal storage files, you need to make the file readable:
shareFile.setReadable(true, false);
Here is the code for attachment of csv file in mail (Its working code):
MyCsvFile.csv" should be present in your Internal/External memory of phone.
For More Look into this :https://stackoverflow.com/a/48643905/8448886
Below is the code for attachment of csv file into mail :
String csv = (Environment.getExternalStorageDirectory().getAbsolutePath() + "/MyCsvFile.csv"); // Here csv file name is MyCsvFile.csv
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent emailIntent = new Intent(Intent.ACTION_SEND);
emailIntent.setType("text/plain");
emailIntent.putExtra(Intent.EXTRA_EMAIL, new String[]{"email#example.com"});
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "subject here");
emailIntent.putExtra(Intent.EXTRA_TEXT, "body text");
File file = new File(csv);
Uri uri = Uri.fromFile(file);
emailIntent.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(Intent.createChooser(emailIntent, "Pick an Email provider"));
}
});
Related
For my company i am trying to send email from my android app using email intent.
I'm using emulator to test my app. But the problem is when i'm trying to Add and Attachment (eg. pdf, image) it won't attaching yet.
here is my code:
private String SendEmail(String oid, final String img, final String party_code, final String order_by, final Bitmap attachimg, final String note) {
try {
String filename="DOAttachment.jpeg";
String subject ="Order "+oid+" has been sent successfully";
String body="\nDear Sir, \n"+"Please find the attached file herewith.\nThe D.O for the customer(party) "+party_code+" has been successfully done with the order number: "+oid+"\n\n\n"+"With regards \n \n Employee code/ID: "+order_by+"\n\nN.B:"+note;
File root = Environment.getExternalStorageDirectory();
String pathToMyAttachedFile = "DirName/"+filename;
File file = new File(root, pathToMyAttachedFile);
file.setReadable(true,false);
Log.e("File path"," "+file);
//using outlook
Intent intent = new Intent(Intent.ACTION_VIEW).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|FLAG_ACTIVITY_SINGLE_TOP);
intent.setType("image/*");
Uri data = Uri.parse("mailto:?subject=" + subject + "&body=" + body+ "&stream="+Uri.parse("file:///"+Environment.getExternalStorageDirectory().getAbsolutePath())+"/DirName/"+filename);
intent.setData(data);
intent .putExtra(Intent.EXTRA_EMAIL, toemail);
if (!file.exists() || !file.canRead()||!file.canWrite()) {
Log.e(" FILE ERROR ","File Not found");
Toast.makeText(getApplicationContext(),"File Not found",Toast.LENGTH_LONG).show();
}
else {
file.setReadable(true);
Log.e(" FILE OK ","File was found");
Uri uri = Uri.fromFile(file);
intent.putExtra(Intent.EXTRA_STREAM, uri);
}
));
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(intent);
}
return "TRUE";
} catch (Exception e) {
Log.e("SendMail", e.getMessage(), e);
return "MAIL NOT SENT";
}
}
The result is email with empty attachment find screenshot : https://1drv.ms/i/s!AruisQQIx8MTgatuhJFmSaoArg_6Xw
Check whether you had provided READ_EXTERNAL_STORAGE permission for your application both in manifest and run-time.
Then Call the below method send mail assuming the full file path is saved in filePath.
File root = Environment.getExternalStorageDirectory();
String pathToMyAttachedFile = "DirName/"+filename;
File filePath = new File(root, pathToMyAttachedFile)
sendEmailAlert(filePath,subject,text);
CALLED METHOD
private void sendEmailAlert(File fileName,String subject,String text) {
final File file=fileName;
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("application/octet-stream"); /* or use intent.setType("message/rfc822); */
intent.putExtra(Intent.EXTRA_SUBJECT, subject);
intent.putExtra(Intent.EXTRA_TEXT, text);
if (!file.exists() || !file.canRead()) {
Toast.makeText(getContext(), "Attachment Error", Toast.LENGTH_SHORT).show();
return;
}
Uri uri = Uri.fromFile(file);
intent.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(Intent.createChooser(intent, "Send email..."));
}
the photo parameter is the bitmap and i checked it and it shows the cuptured image
how can i convert the bitmap to path so i will able to send as an attachment to mail
this is the code :
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.opencvhc);
ImgPhoto = (ImageView) findViewById(R.id.ImgPhoto);
Bundle extras = getIntent().getExtras();
if (extras != null) {
bm = (BitmapDataObject) getIntent().getSerializableExtra("photo"); //Obtaining data
bitmap = bm.getBip();
ImgPhoto.setImageBitmap(bitmap);
}
Checkmood = (Button) findViewById(R.id.Checkmood);
Check = (Button) findViewById(R.id.Check);
txtView = (TextView) findViewById(R.id.txt);
}
public void CheckClick(View view) throws IOException {
String file = MediaStore.Images.Media.insertImage(getContentResolver(), bitmap, "file", null);
//Uri screenshotUri = Uri.parse(file);
Toast.makeText(OpenCVhc.this, file, Toast.LENGTH_SHORT).show();
final Intent emailIntent1 = new Intent(android.content.Intent.ACTION_SEND);
emailIntent1.putExtra(Intent.EXTRA_EMAIL, new String[]{"comfplatform#gmail.com"});
emailIntent1.putExtra(Intent.EXTRA_SUBJECT, "Image processing picture");
emailIntent1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// emailIntent1.putExtra(Intent.EXTRA_STREAM, screenshotUri);
emailIntent1.putExtra(Intent.EXTRA_TEXT, "" +
"We checked your photo with the Ecg-Leads \n 1) : " +
"\n the image proccessing ___ ");
emailIntent1.setType("image/png");
try {
startActivity(Intent.createChooser(emailIntent1, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(OpenCVhc.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}
}
}
See this solution and don't forget to check for "WRITE_EXTERNAL_STORAGE" permission before writing to file.
Reference : Android: Saving Bitmap to External Memory
public void saveImageToExternalStorage(Bitmap finalBitmap) {
String root =Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-" + n + ".jpg";
File file1 = new File(myDir, fname);
if (file1.exists())
file1.delete();
try {
FileOutputStream out = new FileOutputStream(file1);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
}
catch (Exception e) {
e.printStackTrace();
}
// Tell the media scanner about the new file so that it is
// immediately available to the user.
MediaScannerConnection.scanFile(this, new String[] { file1.toString() }, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.i("ExternalStorage", "Scanned " + path + ":");
Log.i("ExternalStorage", "-> uri=" + uri);
}
});
}
I've added an email intent to an Android app with code to add a local file as an attchment.
But when I click "Email Data" button to open the intent I get a an app crash
and log cat shows the following, http://hastebin.com/idejavunam.avrasm , an error of null pointer exception is output at this line:
case R.id.emailBtn:
so I thought its a problem with the file uri but can't see why as the file exists in the device's file system.
Does anyone know how I can debug this issue?
Possibly I'm passing the file's path to email intent incorrectly?
This is the process I'm following to implement the solution.
code from the method that creates csv file:
String baseDir = android.os.Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = "AnalysisData.csv";
//this filePath is used in email code and converted to Uri.
filePath = baseDir + File.separator + fileName;
File f = new File(filePath);
And this is the code where the email intent is called, with the file path converted to a Uri for attachment prposes:
case R.id.emailBtn: {
Toast.makeText(this, "email clicked", Toast.LENGTH_SHORT).show();
Uri.fromFile(new File(filePath));
Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
"mailto","abc#gmail.com", null));
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "EXTRA_SUBJECT");
emailIntent.putExtra(Intent.EXTRA_STREAM, filePath);
startActivity(Intent.createChooser(emailIntent, "Send email..."));
break;
I have modified some part check, if it works now.
case R.id.emailBtn: {
Toast.makeText(this, "email clicked", Toast.LENGTH_SHORT).show();
Uri uri = Uri.fromFile(new File(filePath));
Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
"mailto","abc#gmail.com", null));
emailIntent.setType("*/*");
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "EXTRA_SUBJECT");
emailIntent.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(Intent.createChooser(emailIntent, "Send email..."));
break;
UPDATE
Also after looking at the logcat I found that your filepath is null . kindly correct that
EDIT
I have modified your onClick Method simply replace tell me if it works for you
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
String baseDir = android.os.Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = "AnalysisData.csv";
filePath = baseDir + File.separator + fileName;
File f = new File(filePath);
switch (v.getId()) {
case R.id.exportBtn: {
Toast.makeText(this, "select clicked", Toast.LENGTH_SHORT).show();
//write sample data to csv file using open csv lib.
date = new Date();
CSVWriter writer = null;
// File exist
if(f.exists() && !f.isDirectory()){
FileWriter mFileWriter = null;
try {
mFileWriter = new FileWriter(filePath , true);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
writer = new CSVWriter(mFileWriter);
}
else {
try {
writer = new CSVWriter(new FileWriter(filePath));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
String data [] = new String[] {"Record Number","Ship Name","Scientist Name","Scientist Email","Sample Volume","Sample Colour","Sample Material","Latitude","Longitude","Date","\r\n"};
writer.writeNext(data);
/*
//retrieve record cntr from prefs
SharedPreferences settings = getSharedPreferences("RECORD_PREF", 0);
recordCntr = settings.getInt("RECORD_COUNT", 0); //0 is the default value
*/
//increment record count
recordCntr++;
/*
//save record cntr from prefs
settings = getSharedPreferences("RECORD_PREF", 0);
SharedPreferences.Editor editor = settings.edit();
editor.putInt("RECORD_COUNT",recordCntr);
editor.commit();
*/
data = new String[]{Integer.toString(recordCntr),shipName,analystName,analystEmail,sampleVolume,
sampleColour,sampleMaterial,latitudeValue.toString(),longitudeValue.toString(),new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date),"\r\n"};
writer.writeNext(data);
try {
writer.close();
Toast.makeText(this, "Data exported succesfully!", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(this, "Error exporting data!", Toast.LENGTH_SHORT).show();
}
break;
}
case R.id.emailBtn: {
Toast.makeText(this, "email clicked", Toast.LENGTH_SHORT).show();
if (f.exists() && !f.isDirectory()) {
Uri uri = Uri.fromFile(f);
Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
"mailto","abc#gmail.com", null));
emailIntent.setType("*/*");
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "EXTRA_SUBJECT");
emailIntent.putExtra(Intent.EXTRA_STREAM, uri);
startActivity(Intent.createChooser(emailIntent, "Send email..."));
}
break;
}
}
}
I am going to attach ".csv" in mail and send it. but facing the problem that the csv file is not available at receiver side.
I have tried too many Mime types
application/octet-stream, text/comma-separated-values, text/csv, application/csv, application/excel, application/vnd.ms-excel, application/vnd.msexcel
but the file is not attached with the mail.
below are the code which i have used to send the mail
public boolean sendEmail() {
boolean success = false;
Intent intentSendMail = new Intent(Intent.ACTION_SEND);
File mydir = getApplicationContext().getDir(Global.FOLDERNAME, Context.MODE_PRIVATE);
File fileWithinMyDir = new File(mydir, Global.FILENAME);
if (!fileWithinMyDir.exists() || !fileWithinMyDir.canRead()) {
Toast.makeText(this, "Attachment Error", Toast.LENGTH_SHORT).show();
success = false;
} else {
intentSendMail.setType("text/csv");
intentSendMail.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(fileWithinMyDir));
intentSendMail.putExtra(Intent.EXTRA_SUBJECT,
"Subject");
intentSendMail.putExtra(Intent.EXTRA_TEXT, "Sent from my phone.");
startActivity(Intent.createChooser(intentSendMail, "E-mail"));
success = true;
}
return success;
}
Thanks in advance..
Try out as below:
String FILE = Environment.getExternalStorageDirectory() + File.separator
+ "Foldername";
Intent sendIntent = new Intent(android.content.Intent.ACTION_SEND);
sendIntent.setType("application/csv");
sendIntent.putExtra(android.content.Intent.EXTRA_EMAIL, "");
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "");
sendIntent.putExtra(Intent.EXTRA_TEXT, "");
String temp_path = FILE + "/" + "Filename.csv";
File F = new File(temp_path);
Uri U = Uri.fromFile(F);
sendIntent.putExtra(Intent.EXTRA_STREAM, U);
startActivity(Intent.createChooser(sendIntent, "Send Mail"));
Hope this will help you.
I got the solution for this problem.
Below are the solution
public boolean sendEmail() {
String destLocation = "";
String FILE = Environment.getExternalStorageDirectory()+"";
destLocation = FILE + "/" + Global.FILENAME;
boolean success = false;
Intent intentSendMail = new Intent(Intent.ACTION_SEND);
File mydir = getApplicationContext().getDir(Global.FOLDERNAME, Context.MODE_PRIVATE);
File fileWithinMyDir = new File(mydir, Global.FILENAME);
copyFile(Uri.fromFile(fileWithinMyDir).toString(),destLocation);
if (!fileWithinMyDir.exists() || !fileWithinMyDir.canRead()) {
Toast.makeText(this, "Attachment Error", Toast.LENGTH_SHORT).show();
success = false;
} else {
intentSendMail.setType("application/csv");
intentSendMail.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://"+destLocation));
intentSendMail.putExtra(Intent.EXTRA_SUBJECT,
"Test Play file.");
intentSendMail.putExtra(Intent.EXTRA_TEXT, "");
startActivity(Intent.createChooser(intentSendMail, "E-mail"));
success = true;
}
return success;
}
try this
emailIntent.setType("plain/text");
emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file:///mnt/sdcard/sanket test/siteriskassesment.csv"));
OR
see this
I have a problem that I want to send an email with Image attachment and image is on Url. I am not able to send that. Please suggest me for right result.
Thanks in advance.
Here is the code:
btn_mail.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
setImage(item.getImageUrl());
if(item instanceof Product)
{
body = "<html><body>Found this a great deal on "+item.getTitle()+"<br><br><img src="+item.getImageUrl(100)+"></body></html>";
}else
{
Offer offer = (Offer)item;
body = "<html><body>Found this a great deal on "+item.getTitle()+"<br><br><img src="+item.getImageUrl(100)+"></body></html>";
}
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, item.getTitle());
/*emailIntent.putExtra(android.content.Intent.EXTRA_TEXT,
"Title: " + item.getTitle() + "\n" +
"Description: " + item.getDescription() + "\n" + "\n" +
"Max Price: " + max_price + "\n" +
"Min Price: " + min_price);*/
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT,Html.fromHtml(body));
//emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("android.resource://com.shopzilla.android.common/" + R.drawable.barcode));
//emailIntent.putExtra(Intent.EXTRA_STREAM, imageBitmap);
emailIntent.setType("message/rfc822");
context.startActivity(Intent.createChooser(emailIntent, "Send mail..."));
}
});
private void setImage(String string) {
try {
URL url = new URL(string);
imageBitmap = BitmapFactory.decodeStream(url.openConnection().getInputStream());
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
The <img> tag won't work. To send the image as an attachment, you must save it to the SD card.
You'll need to add
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
to your AndroidManifest.xml.
To save the image, do this (in a background thread!):
try {
File rootSdDirectory = Environment.getExternalStorageDirectory();
File pictureFile = new File(rootSdDirectory, "attachment.jpg");
if (pictureFile.exists()) {
pictureFile.delete();
}
pictureFile.createNewFile();
FileOutputStream fos = new FileOutputStream(pictureFile);
URL url = new URL("http://your_image_server/dummy.jpg");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setDoOutput(true);
connection.connect();
InputStream in = connection.getInputStream();
byte[] buffer = new byte[1024];
int size = 0;
while ((size = in.read(buffer)) > 0) {
fos.write(buffer, 0, size);
}
fos.close();
} catch (Exception e) {
e.printStackTrace();
return null;
}
After the image is saved, get its Uri and send to the intent (in the main thread):
Uri pictureUri = Uri.fromFile(pictureFile);
emailIntent.putExtra(Intent.EXTRA_STREAM, pictureUri);
Hope it helps :)
You can do that very quickly with this code
protected Uri getImageUri(String imgTitle,Bitmap inImage) {
if(inImage == null) {
return null;
}
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = Images.Media.insertImage(getContentResolver(), inImage, imgTitle, null);
return Uri.parse(path);
}
The Bitmap come from imageview and you can easy have it from
((BitmapDrawable)img.getDrawable()).getBitmap()
getImageUri has to be executed in a Thread (or Handler) in order not to block the main application behavior