Develop Reference

Invalid Request when debuging on Android devide, Xamarin

I'm writing a project in Xamarin Forms, and today we try our app on Android device. And our request to googleAPI stop working. Here's code :
HttpWebRequest webRequest = WebRequest.Create(#"https://maps.googleapis.com/maps/api/place/search/json?location=" + position.Latitude + "," + position.Longitude + "&radius=1000&types=bar&sensor=false&key=APIKEY") as HttpWebRequest;
webRequest.Method = "GET";
webRequest.BeginGetResponse(new AsyncCallback(RequestCompleted), webRequest);
and then :
var request = (HttpWebRequest)result.AsyncState;
var response = (HttpWebResponse)request.EndGetResponse(result);
using (var stream = response.GetResponseStream())
{
var r = new StreamReader(stream);
var resp = r.ReadToEnd();
}
We got response and change it to json. On computer it works OK, but on Android it is saying INVALID REQUEST. Someone worked with Xamarin and know how to solve it?

If I would have to guess, I'd guess, that the locale/ language on your phone is different to that one on your pc.
HttpWebRequest webRequest = WebRequest.Create(#"https://maps.googleapis.com/maps/api/place/search/json?location=" + position.Latitude + "," + position.Longitude + "&radius=1000&types=bar&sensor=false&key=APIKEY") as HttpWebRequest;
There are implicit ToString() at ...n=" + position.Latitude + "," + position.Longitude + "&ra... that produce a localized output. But the google API needs the values with a . as decimal separator.
Append .ToString("G", CultureInfo.InvariantCulture)
HttpWebRequest webRequest = WebRequest.Create(#"https://maps.googleapis.com/maps/api/place/search/json?location=" +
position.Latitude.ToString("G", CultureInfo.InvariantCulture) +
"," + position.Longitude.ToString("G", CultureInfo.InvariantCulture) +
"&radius=1000&types=bar&sensor=false&key=APIKEY") as HttpWebRequest;

LocalNofication sound in CN1

Neither on Android nor on iOS the sound file referenced by a LocalNotification instance is played (check the sample code below). On Android the system's standard sound is played. Anyone knows what I am doing wrong here?
#Override
protected void postMain(Form f) {
Container contentPane = f.getContentPane();
contentPane.setLayout(new BorderLayout(BorderLayout.CENTER_BEHAVIOR_CENTER_ABSOLUTE));
contentPane.setUIID("ToastBar");
Button btn = new Button("create Notification");
btn.addActionListener((e) -> {
scheduleNotification(Display.getInstance(), 0, "Title", "Body", "notification_sound_file.mp3", System.currentTimeMillis() + 1000);
});
contentPane.add(BorderLayout.CENTER, btn);
}
private void scheduleNotification(Display dsp, int nId, String nTitle, String nBody, String soundFileName, long scheduleTime) {
LocalNotification ntf = new LocalNotification();
ntf.setId(nId + " " + scheduleTime);
ntf.setAlertTitle(nTitle);
ntf.setAlertBody(nBody + " " + scheduleTime);
ntf.setAlertSound("/" + soundFileName);
Log.p("scheduling ntf ("+nTitle+","+ ntf.getAlertBody() +","+ ntf.getAlertSound());
dsp.scheduleLocalNotification(ntf, scheduleTime, LocalNotification.REPEAT_NONE);
}
Note: notification_sound_file.mp3 does exist in my default package!

If you want to get the sound file from device storage, then it can't detect directly
Instead of using this
ntf.setAlertSound("/" + soundFileName);
Try this
ntf.setAlertSound(Environment.getExternalStorageDirectory().getAbsolutePath() + "Folder_Name/" + soundFileName);
This will locate your file and your specific sound will play. One more thing add "android.permission.READ_EXTERNAL_STORAGE" permission also in manifest.
Best of luck.

The sound file needs to be a path to a file in FileSystemStorage which must always be fully qualified. You need to copy the file into the filesystem ideally under the app directory see https://www.codenameone.com/how-do-i-use-storage-file-system-sql.html

Selenium File Upload iOS or Android using BrowserStack

Is there any possibility to upload a file on mobile browser (Safari on iOS, Chrome on Android)? Conventional methods doesn't seem to work. Maybe there are similar options to BrowserStack where file upload can actually work?

BrowserStack uses Appium to drive your Selenium tests on Android and iOS.
As given here, since Appium currently does not support uploads, BrowserStack too wouldn't be able to support File Upload on mobile devices.

This is a hacky file upload solution using base64 and JS, but it works, so hey, I hope you find this useful:
public CorePage UploadHack(string fileInputId, string contentType, string fileContent, string fileName, string angularScopeVar)
{
UploadFile(_filePath);
var uploadHack =
"(function(){" +
"function convert(base64){" +
"var raw = atob(base64);" +
"var arr = new Uint8Array(new ArrayBuffer(raw.length));" +
"for (var i = 0; i < raw.length; i++){" +
"arr[i] = raw.charCodeAt(i);" +
"}" +
"return arr; " +
"}" +
$"var file = new Blob([convert('{fileContent}')], {{'type':'{contentType}'}}); " +
$"file.name = '{fileName}'; " +
$"angular.element('#{fileInputId}').scope().{angularScopeVar} = file;" +
"})()";
Driver.ExecuteJavaScript(uploadHack);
return this;
}

Microsoft Sync Framework - ServerBlob is Empty Error

I am using Microsoft Sync Framework to sync the details from the Datadictionary on android device with SQL Server. Initially get success to sync all data from sql server. But after adding some data and when clicking on the Sync button getting the following error. Can you please tell me is anybody came across this?
[Sync Error]:Error occurs during sync. Please check logs below.
[Upload Change Response Error]: 500 Response: <ServiceError xmlns="http://schemas.datacontract.org/2004/07/Microsoft.Synchronization.Services" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><ErrorDescription>System.InvalidOperationException
 serverBlob is empty
 at Microsoft.Synchronization.Services.SqlProvider.SqlSyncProviderService.ApplyChanges(Byte[] serverBlob, List`1 entities)
 at Microsoft.Synchronization.Services.UploadChangesRequestProcessor.ProcessRequest(Request incomingRequest)
 at Microsoft.Synchronization.Services.SyncService`1.ProcessRequestForMessage(Stream messageBody)
 
 
 </ErrorDescription></ServiceError>
In the below code, i'm getting xmlHttp.status=500 when clicking on the Sync button
this.sendRequest = function (serviceUri, successCallback, errorCallback, dir) {
TraceObj("[" + dir + " Request]:", serviceUri, this.dataObject());
// Construct HTTP POST request
var xmlHttp = new XMLHttpRequest();
xmlHttp.open("POST", serviceUri);
xmlHttp.setRequestHeader("Accept", "application/json");
xmlHttp.setRequestHeader("Content-Type", "application/json");
// Handle success & error response from server and then callback
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200) {
var res = new SyncFormatter();
if (res.parse(xmlHttp.responseText)) {
TraceObj("[" + dir + " Response]:", serviceUri, res.dataObject());
alert("[" + dir + " Response]:", serviceUri, res.dataObject());
successCallback(res);
return;
}
}
TraceMsg("[" + dir + " Response Error]: ", xmlHttp.status + " Response: " + xmlHttp.responseText);
errorCallback(xmlHttp.responseText);
}
};
xmlHttp.send(this.toString());
};
}

I have found the root cause of the problem. That is when i get the values from datadictionary storage, value has the single quotes in the values so not able to load the values in webview. Now i have replaced single quotes by \'. Now working fine.

How to redirect logcat output?

Is there a way to redirect the logcat's output towards an InputStream or something like that? I'm thinking of something in the lines of how you can redirect the stderr in C.
I want to do it so its redirected when my app starts and everything that happends get dumped to a file.

If you can connect the device for debugging, you can this from the command line
$ adb logcat > textfile.txt

The easiest way I found is to use System.setErr. I allows you to easily redirect the error output to a file.
Example:
System.setErr(new PrintStream(new File("<file_path>"))

The only redirecting possibilites of LogCat output are documentend here and here.
It is not possible to reuse the LogCat output in your app itself. You can however, export it to a file like you ask.

to filter logcat just from your app try this:
int pid = android.os.Process.myPid();
File outputFile = new File(Environment.getExternalStorageDirectory() + "/logcat.txt");
Log.d("zzz","outputFile: " + outputFile);
try {
String command = "logcat | grep " + pid + " > " + outputFile.getAbsolutePath();
Log.d("zzz","command: " + command);
Process p = Runtime.getRuntime().exec("su");
OutputStream os = p.getOutputStream();
os.write((command + "\n").getBytes("ASCII"));
} catch (IOException e) {
}

In Kotlin, this is what I used and it seems to create and log to the logcat.txt file (located in the app directory) whether the app is being debugged or run directly from the tablet. (Sidenote: For some reason the directory doesn't refresh or show up in file explorer until I stop the app and reconnect the device.) (thanks for the help from the previous contributors)
located in utilities...
val publicDirectory = globalContext.getExternalFilesDir(null)
publicDirectoryName = publicDirectory?.toString() + "/"
fun redirectLogcatToFile() {
try {
val filename =
File(Utilities.publicDirectoryName + "logcat.txt")
filename.createNewFile()
val cmd = "logcat -v time -f " + filename.getAbsolutePath() +" -s " + logcatTag
Runtime.getRuntime().exec(cmd)
} catch (ex: Exception ) {
Utilities.toastOnAnyThread("Utilities.redirectLogcatToFile: " + ex.message)
}
}
fun Log( message : String ){
Log.i(logcatTag, message )
}