xamarin.android

问题 I need to deploy a new version of my Android app made with Xamarin. My app stores files in the following path: android > data > APP.PACKAGE_NAME > files > data The problem is those files are wiped after the upgrade and the app needs to resync with the remote server, is this behavior normal or am I missing something ? What I do is upgrade the version number in the properties > Android Manifest, then Archive and deploy the generated apk on my device. 回答1: If your device is rooted, it can be the

问题 As the title indicates, I am in the process of upgrading the dependencies of an existing Xamarin.Android project. The Android project uses MvvmCross for much of the cross-platform code (we support other platforms as well). As part of this upgrade, we are moving from MvvmCross 6.2.2 to 6.4.1. We are currently building the app with Visual Studio 2019. However, after upgrading, I have noticed that many of my project's layouts no longer bind under as consistently as they did when running. For

问题 I was wondering how to implement this Android AsyncTask using .NET's async libraries: public class LoadRecordTask : AsyncTask { private Activity1 _context; private int _recordId; public LoadRecordTask( Activity1 outerActivity, int recordId ) { _context = outerActivity; _recordId = recordId; } protected override void OnPreExecute() { base.OnPreExecute(); _progressDialog = Android.App.ProgressDialog.Show( _context , "", "Loading record {0}", _recordId ); } protected override Java.Lang.Object

问题 I'm using C# in Visual Studio 2017 and Xamarin.Android (not Xamarin.Forms) in my project. To be clear, I'm using "Cross Platform App(Xamarin)" and not using "Class Library (Xamarin.Forms). I want it to work on both IOs and Android. My problem is I want to program my app to look like ^ ^ in landscape mode and < ^ in portrait mode(please look at it like it is in portrait mode). Basically I want to rotate the first one and put it on top, and doesn't wanna change the second one and put it on the

问题 I have reason to believe that the type provider that I'm using is hanging my app that's running on the Android emulator. On my main page within a Xamarin.Forms app, I have the following load operation: protected override void OnAppearing() { _viewModel.Load(); return; // Never gets reached when using Type Provider... } My viewmodel has the following load operation: public void Load() => Cars = new ObservableCollection<Car>(getCars()); My F# code is the following: open FSharp.Data // https:/

问题 I've been working on an android app and test it on the emulator. Parts of this app require some processing time, such as login, could take up to 10 seconds. If the app is processing the login, and I clicked anywhere on the emulator screen, it will cause the app to crash -> a force close/wait window will pop up and even I choose to wait, this login process will never complete. I wonder did anybody else encounter this situation? What could I do to avoid user clicking during processing and crash

问题 Making my Bluetooth application I need access to some broadcast actions on the Android side of my code. All this is run in my Core, so I have a ViewModel that will call through my interface public interface IConnectionService { //Properties string IntentName { get; } //Events event EventHandler<SearchConnectionItemEventArgs> SearchItemFoundEvent; //Methods void RunIntent(); void SearchConnection(); void Connect(string macAddress); } RunIntent prompts the user to turn on Bluetooth (Could be

问题 I'm working on mobile android app in C# where I need to display a route and calculate it's distance. I need a result similar like in this picture 回答1: To display a route, you need at first calculate it. You can use google Direction API to do that. The cool thing is, that it will return you a total distance as well. So it's only one request to satisfy all your requirements. Google Directions API have a lot of requests examples, you can calculate road between two places by referencing them by

问题 I've been trying to create a binding project for this token auto complete text view project on GitHub (https://github.com/mattwhetton/TokenAutoComplete). I'm basically trying to port it to us in Xamarin / Mono (C#) I've been immediately getting the following error: Inconsistent accessibility: parameter type 'Com.Tokenautocomplete.TokenCompleteTextView.TokenImageSpan' is less accessible than method 'Com.Tokenautocomplete.TokenCompleteTextView.TokenTextWatcher.RemoveToken(Com.Tokenautocomplete

问题 I have exception in xamarin forms – in android – when closing a custom map. I am rendering it in android and once every 5~ times I get exception when closing the page with the google maps The exception is as follows: UNHANDLED EXCEPTION: System.NotSupportedException: Unable to activate instance of type Xamarin.Forms.Maps.Android.MapRenderer from native handle b250001d ---> System.MissingMethodException: No constructor found for Xamarin.Forms.Maps.Android.MapRenderer::.ctor(System.IntPtr,