Xamarin

问题 Is it considered a good practice to call an Async method that does some heavy lifting with server connections and data exchange during OnStart() event of the application given that this method does not touch the UI thread? Are all the components of the application properly initialized at the time of this event firing for the Async method to be able to execute? protected override async void OnStart() { sendHttpRequestAsync(); } private async void sendHttpRequestAsync() { await ... } 回答1: Avoid

问题 Im having trouble with this call logs of the device. The code is not returning the logs at all, It's giving false data. Code: public void ReadCalls() { try { Android.Content.Context myContext = Android.App.Application.Context; string myDateToCheck = myServiceRef.myTimeToCheck("CallLog"); if (myDateToCheck==null || myDateToCheck=="") {myDateToCheck = "0";} ICursor cursor = myContext.ContentResolver.Query( Android.Net.Uri.Parse ("content://call_log/calls"), null, "Date > ?", new string[]

问题 Im having trouble with this call logs of the device. The code is not returning the logs at all, It's giving false data. Code: public void ReadCalls() { try { Android.Content.Context myContext = Android.App.Application.Context; string myDateToCheck = myServiceRef.myTimeToCheck("CallLog"); if (myDateToCheck==null || myDateToCheck=="") {myDateToCheck = "0";} ICursor cursor = myContext.ContentResolver.Query( Android.Net.Uri.Parse ("content://call_log/calls"), null, "Date > ?", new string[]

问题 I have a PCL library I want to distribute as NuGet package. Screenshot of the PCL application library properties page: csproj file: <TargetFrameworkVersion>v4.5</TargetFrameworkVersion> <TargetFrameworkProfile>Profile111</TargetFrameworkProfile> <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids> Steps to reproduce my problem: Clone both repos from: NuGet package Console application + PCL library Build the NugetPackage project +

问题 I have a PCL library I want to distribute as NuGet package. Screenshot of the PCL application library properties page: csproj file: <TargetFrameworkVersion>v4.5</TargetFrameworkVersion> <TargetFrameworkProfile>Profile111</TargetFrameworkProfile> <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids> Steps to reproduce my problem: Clone both repos from: NuGet package Console application + PCL library Build the NugetPackage project +

问题 I have a PCL library I want to distribute as NuGet package. Screenshot of the PCL application library properties page: csproj file: <TargetFrameworkVersion>v4.5</TargetFrameworkVersion> <TargetFrameworkProfile>Profile111</TargetFrameworkProfile> <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids> Steps to reproduce my problem: Clone both repos from: NuGet package Console application + PCL library Build the NugetPackage project +

问题 I have a PCL library I want to distribute as NuGet package. Screenshot of the PCL application library properties page: csproj file: <TargetFrameworkVersion>v4.5</TargetFrameworkVersion> <TargetFrameworkProfile>Profile111</TargetFrameworkProfile> <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids> Steps to reproduce my problem: Clone both repos from: NuGet package Console application + PCL library Build the NugetPackage project +

问题 When compile my Xamarin Forms Android application, visual studio, show me an error's list of AndroidManifest.xml conflict, for example: /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(3,3): Error AMM0000: is also present at AndroidManifest.xml:14:9-41 value=(@string/app_name). (AMM0000) /Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(3,3): Error AMM0000: Suggestion: add 'tools:replace="android

问题 We accidentally deleted the .csproj file of our android project in xamarin.forms. Is there any way to generate it again? 来源： https://stackoverflow.com/questions/59622699/how-to-generate-csproj-file-in-visual-studio-2019

问题 I'm writing a Xamarin.Forms desktop application, and I'll ultimately want to target MacOS and Windows. Does Xamarin.Forms have any platform independent mechanisms which you can use to build the application menu (i.e. the one where you find "File", "Edit", "View", etc; and which appears in the MacOS menu bar at the top of the screen)? The most I've found is the Xamarin.Forms.Menu and Xamarin.Forms.MenuItem classes, but I'm not clear on what they actually do or how to use them. 回答1: Although