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data not passing when running doInBackground method within for loop

I have some pics to upload to the ftp server and I am using Asynctask for it.The images need to be sent to multiple host so I am using a for loop.The data to be passed is very well being fetched by the constructor but the doInBackground method is not running which was earlier running very well without the for loop and the additional data apart from the String filePathName that I am trying to pass in now in doInBackground.please help me
class uploadTask extends AsyncTask<String, Void, String> {
public uploadTask(String filePathName,String host_2,String user_2,String pass_2)
{
filePath=filePathName;
host_1=host_2;
user_1=user_2;
pass_1=pass_2;
Toast.makeText(getBaseContext(),"FTP DATA RECEIVING:"+"HOST:"+host_2+" USERNAME:"+user_2+" PASS:"+pass_2,Toast.LENGTH_LONG).show();
//hostName=host;
}
#Override
protected String doInBackground(String... params) {
try {
Toast.makeText(getBaseContext(),"Entered Do in Background Method to upload",Toast.LENGTH_SHORT).show();
ftp_host = "ftp.photoshelter.com";//This is not the correct way. Supposed to get from Backendless table
ftp_username = "brytest";//This is not the correct way. Supposed to get from Backendless table
ftp_password = "passtest";//This is not the correct way. Supposed to get from Backendless table
Toast.makeText(getBaseContext(),"HOST:"+ftp_host+" USERNAME:"+ftp_username+" PASS:"+ftp_password,Toast.LENGTH_LONG).show();
news_agency = "news agency";
easyFTP ftp = new easyFTP();
ftp.connect(ftp_host, ftp_username, ftp_password);
status = ftp.setWorkingDirectory("mem/images"); // if User say provided any Destination then Set it , otherwise
// Upload will be stored on Default /root level on server
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageTimeStamped = ftp_username + "_" + timeStamp + ".png";
FileInputStream is = new FileInputStream(imageFileLocation);
//addPhotoGrapherInfo();
ftp.uploadFile(is, imageTimeStamped);
System.out.println("Successfull ftp upload to " + ftp_host);
Toast.makeText(getBaseContext(), "Photo uploading by ftp to " + ftp_host, Toast.LENGTH_LONG).show();
//}
//reset booleans
//cameraPicTaken = false;
//galleryImageSelected = false;
//System.out.println("reset cameraPicTaken and galleryImageSelected");
// }
return new String("Upload Successful");
}catch (Exception e){
String t="Failure : " + e.getLocalizedMessage();
return t;
}
}
}
my onClickListener with for loop
if(cameraPicTaken || galleryImageSelected) {
Toast.makeText(SubmitActivity.this,"Image Location is:"+ imageFileLocation,Toast.LENGTH_LONG).show();
//addPhotoGrapherInfo();
for(int i=0;i<Common.selectedHostArray.size();i++) {
uploadFile(imageFileLocation,Common.selectedHostArray.get(i),Common.selectedUsernameArray.get(i),Common.selectedPasswordArray.get(i));
}
cameraPicTaken = false;
galleryImageSelected = false;
}
funnction called in onClick
public void uploadFile(String filePath,String host_1,String user_1,String pass_1)
{
if(cameraPicTaken == true) {
System.out.println("camera photo start upload");
//for(int i=0;i<Common.selectedHostArray.size();i++) {
//host_1=Common.selectedHostArray.get(i);
//user_1=Common.selectedUsernameArray.get(i);
//pass_1=Common.selectedPasswordArray.get(i);
//host_1="ftp.photoshelter.com";
//user_1="brytest";
//pass_1="passtest";
Toast.makeText(getBaseContext(),"FTP DATA PASSING:"+"HOST:"+host_1+" USERNAME:"+user_1+" PASS:"+pass_1,Toast.LENGTH_LONG).show();
new uploadTask(filePath,host_1,user_1,pass_1).execute();
// }
//cameraPicTaken = false;
//galleryImageSelected = false;
System.out.println("reset cameraPicTaken and galleryImageSelected");
//cameraPicTaken = false;
}
if(galleryImageSelected == true){
System.out.println("gallery image start upload");
Toast.makeText(getBaseContext(),"FTP DATA PASSING:"+"HOST:"+host_1+" USERNAME:"+user_1+" PASS:"+pass_1,Toast.LENGTH_LONG).show();
new uploadTask(filePath,host_1,user_1,pass_1).execute();
//new uploadTask(filePat)h.execute();
//galleryImageSelected = false;
}
Toast.makeText(getBaseContext(), "Photo uploading by ftp to photoshelter.com" /*+ news_agency*/, Toast.LENGTH_LONG).show();
}

You're trying to perform a UI command on a background thread (Toast). This is causing your background tasks to fail early. Since your background tasks catch their own errors, they fail silently.
#Override
protected String doInBackground(String... params) {
try {
// you can't Toast on a background thread, this should throw an exception
Toast.makeText(getBaseContext(),"Entered Do in Background Method to upload",Toast.LENGTH_SHORT).show();
...
}catch (Exception e){
// your Toast exception is getting caught silently here
String t="Failure : " + e.getLocalizedMessage();
return t;
}
}
By the way, the try/catch on everything is not a good practice. You end up with a ton of silent failures leaving you scratching your head and asking why things aren't working.

Forbidden in Call connection Android Pjsip Sip library

How to perform call in Pjsip Android with local server?
I used
User-Agent: Pjsua2 Android 2.6-svn
I made successful registraion after which i tried to call but it throws forbidden(503)
My Registraion Code :
AccountConfig accCfg = new AccountConfig();
accCfg.setIdUri("sip:localhost");
accCfg.getNatConfig().setIceEnabled(true);
accCfg.getVideoConfig().setAutoTransmitOutgoing(true);
accCfg.getVideoConfig().setAutoShowIncoming(true);
//Like 123.12.12.23
accCfg.getRegConfig().setRegistrarUri("sip:172.16.4.124");
AuthCredInfoVector creds = accCfg.getAuthCreds();
creds.clear();
if (username.length() != 0) {
creds.add(new AuthCredInfo("Digest", "*", "abc#172.16.4.124", 0,
"123"));
}
StringVector proxies = accCfg.getSipConfig().getProxies();
proxies.clear();
if (proxy.length() != 0) {
proxies.add("sip:172.16.4.124");
}
accCfg.getSipConfig().setProxies(proxies);
/* Enable ICE */
accCfg.getNatConfig().setIceEnabled(true);
try {
account.add(accCfg);
} catch (Exception e) {
e.printStackTrace();
Log.i(TAG, "Exception in Dialog");
}
}
For Making call I used
public void makeCall(View view) {
if (buddyListSelectedIdx == -1)
return;
/* Only one call at anytime */
if (currentCall != null) {
return;
}
HashMap<String, String> item = (HashMap<String, String>) buddyListView.
getItemAtPosition(buddyListSelectedIdx);
String buddy_uri = item.get("uri");
MyCall call = new MyCall(account, -1);
SendInstantMessageParam param = new SendInstantMessageParam();
param.setContent("Hello Pjsip");
param.setContentType("text");
CallOpParam prm = new CallOpParam(true);
try {
call.makeCall(buddy_uri, prm);
// call.delete();
// call.sendInstantMessage(param);
} catch (Exception e) {
e.printStackTrace();
call.delete();
return;
}
currentCall = call;
showCallActivity();
}
I am able to connect call with sip default client like sip:localhost and other sip provider like linphone but getting forbidden with our server.
Experts please help.

Thanks alot to myself, finally i get the solution after 3 day workout,
had missing portnumber for my amazon server, makes me to get connected and made a sippy call between sip ends.

Signal R persistent connection on phonegap apps (android and ios)

I am using SignalR persistent connection for smooth communication between my client and server. All the web communications work really fine.
Now I am trying to do the same with my PhoneGap apps. It doesn't work. Is there any reason?
Here is my code
StartEvents = function () {
connection = $.connection(connectionString);
connection.logging = true;
connection.received(function (result) {
for (i = 0; i < result.events.length; ++i) {
}
});
connection.start().done(function () {
console.log("connected");
});
};
It does log out connected at the start when the app is connected the first time. But then as events keep happening nothing is pushed from the server.
Server code is this
public class ApiConnection : PersistentConnection
{
protected override Task OnConnected(IRequest request, string connectionId)
{
StartBroadcast(connectionId);
return base.OnConnected(request, connectionId);
}
}
private void StartBroadcast(string connectionId)
{
var timerCall = Observable.Timer(TimeSpan.Zero, TimeSpan.FromSeconds(1));
_subscription = timerCall.Subscribe(async res =>
{
List<dynamic> result = pull();
if (result != null && result.Count > 0)
await Connection.Send(connectionId, new
{
id = _newestId,
events = result
});
});
}

Using ZXing in Xamarin for Android, how do I stop continuous scanning right after I get my result?

I'm using ZXing in an Android app being developed in Xamarin to scan a QR code and start playing the corresponding audio file automatically.
My problem is that when I get a result from scanning, it takes some time for the audio player activity to load so it gets called twice or more due to subsequent successful scannings.
Is there a way to stop continuous scanning as soon as I get a correct result?
Here's the code:
//Start scanning
scanner.ScanContinuously(opt, HandleScanResult);
}
private void HandleScanResult(ZXing.Result result)
{
string msg = "";
if (result != null && !string.IsNullOrEmpty(result.Text))
{
msg = result.Text;
var playerActivity = new Intent(myContext, typeof(AudioActivity));
//-------------------------------------------------------------
// Prerequisite: load all tracks onto "Assets/tracks" folder
// You can put here qr code - track assignments here below
// msg: decoded qr code
// playerActivity.Putextra second parameter is a relative path
// under "Assets" directory
//--------------------------------------------------------------
//Iterate through tracks stored in assets and load their titles into an array
System.String[] trackArray = Application.Context.Assets.List("tracks");
bool trackFound = false;
foreach (string track in trackArray)
{
if (track.Equals(msg + ".mp3"))
{
playerActivity.PutExtra("Track", "tracks/" + msg + ".mp3");
for (int i = 0; i < PostList.postList.Count; i++)
{
if (PostList.postList.ElementAt(i).code.Equals(msg))
playerActivity.PutExtra("TrackTitle", PostList.postList.ElementAt(i).title);
}
myContext.StartActivity(playerActivity);
trackFound = true;
}
}
Thank you!

Old question but i'll post it anyway for anyone still looking for this information.
You need your scanner to be a class variable. This is my code:
public MobileBarcodeScanner scanner = new MobileBarcodeScanner();
private void ArrivalsClick(object sender, EventArgs e)
{
try
{
if (Arrivals.IsEnabled)
{
MobileBarcodeScanningOptions optionsCustom = new MobileBarcodeScanningOptions();
scanner.TopText = "Scan Barcode";
optionsCustom.DelayBetweenContinuousScans = 3000;
scanner.ScanContinuously(optionsCustom, ArrivalResult);
}
}
catch (Exception)
{
throw;
}
}
private async void ArrivalResult(ZXing.Result result)
{
if (result != null && result.Text != "")
{
// Making a call to a REST API
if (resp.StatusCode == System.Net.HttpStatusCode.OK)
{
int? res = JsonConvert.DeserializeObject<int>(resp.Content);
if (res == 0)
{
scanner.Cancel(); // <----- Stops scanner (Something went wrong)
Device.BeginInvokeOnMainThread(async () =>
{
await DisplayAlert("..", "..", "ΟΚ");
});
}
else
{
Plugin.SimpleAudioPlayer.ISimpleAudioPlayer player = Plugin.SimpleAudioPlayer.CrossSimpleAudioPlayer.Current;
player.Load("beep.wav");
player.Play(); // Scan successful
}
}
else
{
scanner.Cancel();
Device.BeginInvokeOnMainThread(async () =>
{
await DisplayAlert("..", "..", "ΟΚ");
});
}
}
}

System.Net.Http.HttpClient with AutomaticDecompression and GetAsync (timeout) vs GetStringAsync (working

I have the following code to make requests to a REST API, using Xamarin and an Android device:
public class ApiBase
{
HttpClient m_HttpClient;
public ApiBase(string baseAddress, string username, string password)
{
if (!baseAddress.EndsWith("/"))
{
baseAddress += "/";
}
var handler = new HttpClientHandler();
if (handler.SupportsAutomaticDecompression)
{
handler.AutomaticDecompression = DecompressionMethods.GZip;
}
m_HttpClient = new HttpClient(handler);
m_HttpClient.BaseAddress = new Uri(baseAddress);
var credentialsString = Convert.ToBase64String(Encoding.UTF8.GetBytes(username + ":" + password));
m_HttpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", credentialsString);
m_HttpClient.Timeout = new TimeSpan(0, 0, 30);
}
protected async Task<XElement> HttpGetAsync(string method)
{
try
{
HttpResponseMessage response = await m_HttpClient.GetAsync(method);
if (response.IsSuccessStatusCode)
{
// the request was successful, parse the returned string as xml and return the XElement
var xml = await response.Content.ReadAsAsync<XElement>();
return xml;
}
// the request was not successful -> return null
else
{
return null;
}
}
// some exception occured -> return null
catch (Exception)
{
return null;
}
}
}
If i have it like this, the first and the second call to HttpGetAsync work perfectly, but from the 3rd on the GetAsyncstalls and eventually throws an exception due to the timeout. I send these calls consecutively, there are not 2 of them running simultaneously since the results of the previous call are needed to decide the next call.
I tried using the app Packet Capture to look at the requests and responses to find out if i'm sending an incorrect request. But it looks like the request which fails in the end is never even sent.
Through experimentation i found out that everything works fine if don't set the AutomaticDecompression.
It also works fine if i change the HttpGetAsync method to this:
protected async Task<XElement> HttpGetAsync(string method)
{
try
{
// send the request
var response = await m_HttpClient.GetStringAsync(method);
if (string.IsNullOrEmpty(response))
{
return null;
}
var xml = XElement.Parse(response);
return xml;
}
// some exception occured -> return null
catch (Exception)
{
return null;
}
}
So basically using i'm m_HttpClient.GetStringAsync instead of m_HttpClient.GetAsync and then change the fluff around it to work with the different return type. If i do it like this, everything works without any problems.
Does anyone have an idea why GetAsync doesn't work properly (doesn't seem to send the 3rd request) with AutomaticDecompression, where as GetStringAsync works flawlessly?

There are bug reports about this exact issue:
https://bugzilla.xamarin.com/show_bug.cgi?id=21477
The bug is marked as RESOLVED FIXED and the recomended action is to update to the latest stable build. But there are other (newer) bugreports that indicate the same thing that are still open, ex:
https://bugzilla.xamarin.com/show_bug.cgi?id=34747
I made a workaround by implementing my own HttpHandler like so:
public class DecompressionHttpClientHandler : HttpClientHandler
{
protected override async Task SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
request.Headers.AcceptEncoding.Add(new System.Net.Http.Headers.StringWithQualityHeaderValue("gzip"));
var msg = await base.SendAsync(request, cancellationToken);
if (msg.Content.Headers.ContentEncoding.Contains("gzip"))
{
var compressedStream = await msg.Content.ReadAsStreamAsync();
var uncompresedStream = new System.IO.Compression.GZipStream(compressedStream, System.IO.Compression.CompressionMode.Decompress);
msg.Content = new StreamContent(uncompresedStream);
}
return msg;
}
}
Note that the code above is just an example and not a final solution. For example the request will not be compressed and all headers will be striped from the result. But you get the idea.