Most voted "xamarin" questions
Use this tag for questions about the Xamarin platform, which enables you to develop native mobile apps for iOS and Android using C# in Mono or Visual Studio. Ideally a specific framework/product tag should be used, unless the problem is general for all editions.
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26
votes1
answer6947
viewsWhen to use Cordova or Xamarin?
When researching a bit about platforms for application development mobile I came across Xamarin and Cordova. Both proposed to develop a single code base for apps running on Android, iOS and Windows…
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22
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answer311
viewsClick on Loginbutton facebook on android using Xamarin with Facebooksdk nothing happens
I’m using Xamarin to try to log in with facebook, I already generated the Hash and appid. ( Apparently correct, because previously the app returned me an msg saying that the HASH was invalid ).…
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15
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answer1873
viewsMobile App Multiplatform with Xamarin
Setting This question is more about architecture. I recently started learning Xamarin to develop Mobile Apps, Xamarin, which until then has been very flexible, has bindings for native Android and…
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15
votes3
answers5859
viewsDevelop for multiple platforms using C# and Xamarin Studio
To not have to learn various technologies to develop for the various mobile platforms, wanted to use only C#. However I have some doubts, namely: Xamarin Studio is free? With the same code, the…
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13
votes1
answer1879
viewsHybrid Apps: when to use and what is needed?
With Hybrid Applications cross-platform gain development time, but have some doubts about the real need to use a framework. The most famous Phonegap, Ionic and Titanium are easy and friendly. But…
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9
votes1
answer1043
viewsHow to resolve error: "XXXX app stopped"?
Good afternoon, I have an application in language C# which develops an app for android (using Xamarin). The application works normally for android of versions 2, 3, 4 and 5. However, using a device…
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9
votes2
answers1951
viewsApp - Xamarin or Ionic?
I need to create an App and would like to know which of your technologies is the most suitable for mobile development. What is the main difference between Xamarin and Ionic? Which of the…
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9
votes0
answers152
viewsError: Valuefactory tried to access the Value property of this instance
Every time I create any project Xamarin in the Visual Studio 2017 the following error is displayed when running the application: Erro: ValueFactory tentou acessar a propriedade Value dessa…
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8
votes2
answers6054
viewsHow do I read the record of incoming and outgoing calls on my iPhone using Xamarin?
How do I read the history log of incoming and outgoing calls on iPhone using Xamarin? I need to read the log of the calls/ made on iPhone. I do not know how to do and I did not find any material in…
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8
votes1
answer494
viewsRead contacts contacts agenda iPhone using Xamarin
How do I read the contact list in my iPhone phone book using Xamarin? I need to read the contact list of the iPhone agenda. I do not know how to do and I did not find any Portuguese material on the…
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8
votes1
answer790
viewsXAML without previewer or designer - Visual Studio
I’m using Visual Studio 2015 Community with Xamarin, and I realized that when editing XAML in designer mode (Shift + F7) I can’t see the preview of it, because another window opens with the same…
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8
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answer119
viewsDesign has more than 65536 methods
When adding the Analytics Package to the project, an error occurred in the project. As explained on this blog , the error occurs when the project has more than 65536 methods (only the added Google…
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8
votes1
answer206
viewsHow to prevent the app from being "minimized" by Appswitch(Recentapps) Xamarin Android
I need to lock the device only for one application. I use in my project a line that determines that my app becomes a launcher. So, the home screen of the device is my application and the HomeButton…
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7
votes1
answer488
viewsXamarin.Forms Portable or Xamarin.Forms Shared
What is the difference between a Xamarin.Forms Portable or Xamarin.Forms Shared project?
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7
votes1
answer1248
viewsWhat is Microsoft’s MAUI?
I read that Microsoft’s MAUI is an evolution of Xamarin.Forms. I would like to know: What changes from the old version to this? What platforms are supported? How the migration between Xamarin.Forms…
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6
votes1
answer678
viewsRead SMS history log on iPhone using Xamarin
I need to read the SMS history log sent/received on iPhone, and your time spent on each shipment. I don’t know how to do it and I couldn’t find any material in Portuguese about it. Can anyone help…
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6
votes1
answer236
viewsBinding Facebook SDK 3.6 for Android
In my project with Xamarin, I need to use the Binding from Facebook SDK for Android version 3.6. However, I could only find the Binding of version 3.0, outdated. Does anyone know where I can find…
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6
votes1
answer631
viewsC# Mobile Development Need Mac?
I was researching tools for mobile development (iOS, Android) and came across Xamarin. I found the proposal interesting, especially for working together with Visual Studio. I downloaded and…
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6
votes2
answers191
viewsDoes the List<T> Method. Foreach exist?
I’m trying to implement the example of this page, but VS2015 (.NET 4.5) says the method ForEach() there is no class Program { static void Main() { List<String> names = new…
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6
votes1
answer561
viewsProblems Xamarin Asynchronous method
In the event of a button of my APP had the following code it worked running on the android emulator, but when I passed the app to the mobile generates a message the app stopped. Button…
c# wcf xamarin asynchronous xamarin-studioasked 8 years, 7 months ago Diego Filipe Pedro Santos 531 -
6
votes2
answers1292
viewsXamarin Error - aapt.exe/Resources
I installed Visualstudio 2015 Community, with Xamarin, until then beauty. But I’m in trouble, actually not only myself, I’ve seen in many places, that quite a lot of people are making the same…
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6
votes2
answers168
viewsWhat is Pushnotification really?
I’ve been wondering now about Pushnotification and if it really is what I want. To solve my problem I need to Pushnotification? See, what I want is this: When the user(seller) changes the flag of…
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5
votes2
answers294
viewsXamarin android player error while starting "virtualbox kernel driver not running"
When executing the XAP-Beta-15.35-v0. 5.5-i386 get the following error: virtualbox kernel driver not running No driver has been installed in virtualbox and it is not running.…
xamarinasked 8 years, 9 months ago SoftLAB Tecnologia 51 -
5
votes3
answers2845
viewsImage to byte[]
Hi! I’m using Xamarin.Forms to make an app. So, I need to save images to Parse. To do this, I need to convert the images to byte[]. Any idea how I can do this ? I’ve looked on the internet but none…
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5
votes1
answer610
viewsXamarin - Sqlite Join
I’m creating an app on Xamarin, which generates a sales order, and stores on mobile. I’m using Sqlite to store the data, but I’m having trouble making a Join between my Order Items table, and the…
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5
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answer168
viewsIs it normal for APK made in Xamarin Forms, even empty, to be 60mb?
I have tried turning on the Linker, and be the recommended procedures. I wondered if it is normal an apk made using Xamarin.Forms start from 60mb. And if not, what to do to reduce the size.
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5
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answers806
viewsAllow Camera and Microphone access to a Webview by Xamarin Android
I created an app webRTC that allows me to do streaming audio and video via using javascript, now I need that by my Android I can access through an app I’m developing. I’m wearing a Webview to load…
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5
votes1
answer376
viewsWeb service hosting equals a website with pages?
I am developing a mobile application with Xamarin. This application is a screen to authorize or not discount above authorized by sellers. So I have a web service that goes into the bank and takes…
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4
votes1
answer179
viewsIs it already possible to make commercial applications with Visual C++ Cross Platform?
Visual Studio 2015 brought with it Visual C++ Cross Platform, which I think works similarly to Xamarin. You can now make business apps with Visual C++ Cross Platform?
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4
votes1
answer421
viewsSend an SMS to one of the contacts
I have an app and at the end I wanted to send a msg to one of the user contacts about my application. var columnNumber = cursor.GetColumnIndex(ContactsContract.CommonDataKinds.Phone.Number);…
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4
votes3
answers34005
viewsIs there an iOS emulator to test an application developed in Xamarin?
There is nothing like testing on the actual device, but in some cases emulators are extremely necessary. For Android I use Genymotion, but at the moment I need some iOS emulator that so I can test…
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4
votes2
answers588
viewsHow to open the Mainpage.axml of a Xamarin Project in Designer mode?
So, I recently downloaded Visual Studio 2017 and came across the Cross-platform Application (Xamarim.Forms or Native), when I create it 4 projects are generated. The App1; App1.Droid; App1.IOS;…
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4
votes2
answers1402
viewsShaman is completely free?
Can anyone say if at any time it is necessary to pay for using Xamarin? If even developing free apps it is necessary to pay? If you are an app that is part of a service, but the app is free, you…
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4
votes1
answer75
viewsStoryboard Segue
I’m creating a small example of an iOS app using Visual Studio 2015 on Windows 10. But every time I open the Main.storyboard by the designer and I click on one of the UIStoryboarSegue the property…
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4
votes2
answers324
viewsWhat is the correct way to use Runonuithread() in Xamarin.Android?
When I need to update a field on the UI, I need to run this code on the UI thread? For example: I have to change my layout Activity. The code I’m using is this: RunOnUiThread(() => {…
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4
votes1
answer150
viewsDoes Xamarin generate Java source code?
I read that with Xamarin it is possible to program in C# for example, and generate a native application Android and IOS. After programming in C#, does it generate sources in Java? I can after making…
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3
votes1
answer302
viewsWhat is the difference between "master Detail application" and "web view application"?
There is some difference in Xamarin between projects master Detail application and web view application? I am started a new project on Xamarin iPhone.
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3
votes1
answer394
viewsHow to set negative values for Android Seekbar?
I’m using Xamarin to develop for Android in C# and checking the component documentation Seekbar I saw that it only has a property "Max", and that the minimum value for the component is 0. How would…
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3
votes2
answers188
viewsHow can I have a Radio Group with 10 radio Buttons divided into 2 columns and 5 rows?
How is it possible to do this? I tried with table row, but that takes away the properties of the radio group. I wanted it to stay that way:…
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3
votes2
answers371
viewsFirst application: Xamarin
I am programmed c# and I need to do a project for android and searching found the Xamarin... I did the installation only that I am not able to compile the project... both in visual studio and in…
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3
votes1
answer662
viewsChange application title in Xamarin Android
I can’t get this off string $projectname$ of my title in an application on Xamarin Android. I already tried to edit the AndroidManifest.xml and AssemblyInfo.cs and nothing. I looked for this string…
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3
votes0
answers330
viewsConnect Xamarin to Mac
I’m trying to connect Xamarin to Mac using Visual Studio. The Mac is listed in Xamarin User Agent, but when informing the user and password I get this message: Starting Broker 4.0.1.96 in port…
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3
votes1
answer198
viewsAndroid VM - Connection Error
Dear friends, good morning! I’m not getting connection on my android emulator, could anyone help me? I’m using Visualstudio Emulator for Android. My project is compiling, and running right, but I…
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3
votes1
answer1118
viewsHow to convert Byte[] to Image in Xamarin MVVM?
How to convert an array of bytes for Image in Xamarin ? I am returning an image that is string type through a WebApi and with that I need to make it displayed in the component Image.…
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3
votes1
answer615
viewsError creating Xamarin cross Plataform project in Visual Studio. "The project requires a Platform SDK (UAP, version=10.0.10.586.0)"
When trying to create a project Cross Platform App with the template Master Detail I get this mistake: The SDK he claims to be absent is installed. I’ve reinstalled it several times. When I try to…
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3
votes2
answers802
viewsCommand button does not work within Listview Xamarin Forms MVVM
I’m trying to create a button with the event Command within a Listview on MVVM, but is not falling in the event ViewModel. How do I get this button Command access your method on ViewModel ? And…
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3
votes0
answers83
viewsXamarin Android - Create a line where your finger goes
Hello, I would like to create a straight or rectangular, where my finger goes. Actually, it doesn’t have to be exactly where you go, but on top of every button I pass the finger it will increase the…
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3
votes2
answers582
viewsNavigation with Xamarin Forms standard MVVM
I recently started studying Xamarin Forms. I have a question that can be clarified here: how to navigate between pages using MVVM? Navigation should be on vm or in the view? Example <?xml…
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3
votes2
answers498
viewsAuto Refresh in Xamarin application.
I am developing an application that in the main screen will have some buttons, and these buttons access a URL sending commands on and off all this through Httpclient and persisting all this…
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3
votes0
answers570
viewsc# Error: "Object Reference not set to an instance of an Object"
I am trying to make a connection to sql server in an Xamarin application for android, however the application presents this error: Object Reference not set to an instance of an Object Connection…