xamarin.forms

问题 I have a xamarin.android project which have a custom camera Preview. Whenever I initialize the camera , it will open as landscape default. So I changed the orientation from SurfaceChanged method like this. private int setCameraDisplayOrientation(Activity mContext, int v) { var degrees = 0; var orientation =0; Display display = mContext.GetSystemService(Context.WindowService).JavaCast<IWindowManager>().DefaultDisplay; Camera.CameraInfo info = new Camera.CameraInfo(); Camera.GetCameraInfo(v,

问题 In my iOS Xamarin forms project I'm using Xam.Plugin.Media from https://github.com/jamesmontemagno/MediaPlugin as follows async void Handle_Clicked(object sender, System.EventArgs e) { await CrossMedia.Current.Initialize(); var file = await CrossMedia.Current.TakeVideoAsync(new Plugin.Media.Abstractions.StoreVideoOptions { DefaultCamera = CameraDevice.Front, SaveToAlbum = true, }); } Is it possible to automatically start video recording or set a timer for the recording to start? Ultimately, I

问题 I'm developing a Xamarin application using Visual Studio 2019. I have to connect to another device through Bluetooth and send some data and receive acknowledgment back. Tried this samples out But didn't help me while connecting for nearby Bluetooth devices, since the below codes are not giving expected results. bluetoothTxSocket = bluetoothDevice.CreateRfcommSocketToServiceRecord(UUID.FromString("00001101-0000-1000-8000-00805f9b34fb")); bluetoothTxSocket.Connect(); Getting below exception

问题 Is there a way to save the picture in an image control to the Android gallery in Xamarin Forms? All help is appreciated. var image = new Image(); image.Source = "test.png"; Screenshot 回答1: You could use Dependency Service to get the stream from Resource/drawable image. Create the IDependency interface. public interface IDependency { MemoryStream DrawableByNameToByteArray(string fileName); } Android implementation public class DependencyImplementation : IDependency { public MemoryStream

问题 I want a structure like this : Click this to see the desired output But with my code i'm getting this : Click this to see the output Here is my xaml code : <ScrollView Orientation="Horizontal"> <StackLayout Orientation="Horizontal" VerticalOptions="Start"> <Grid x:Name="ImagesListViews" > <Grid.RowDefinitions> <RowDefinition Height="*"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> </Grid> <local:BindableStackLayout x:Name=

问题 Whenever I am opening my app I need to check the location is on or off. If the location is off, I need to show an alert to the user to enable location share like the below screenshot: I try this using the dependency service from this thread: The interface on shared Project: public interface ILocSettings { void OpenSettings(); } Android implementation [assembly: Dependency(typeof(LocationShare))] namespace ProjectName.Droid { public class LocationShare : ILocSettings { public void OpenSettings

问题 The screenshot below shows a header that includes a hamburger menu and a title. Notice how the title is centered on it's bounding area (the red box). How can I get the title to center on the width of the phone, but leave the hamburger menu where it is? Here is the code that creates the header area... <?xml version="1.0" encoding="UTF-8"?> <ContentView xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="WP.MobileMidstream.Device.Pages

问题 The screenshot below shows a header that includes a hamburger menu and a title. Notice how the title is centered on it's bounding area (the red box). How can I get the title to center on the width of the phone, but leave the hamburger menu where it is? Here is the code that creates the header area... <?xml version="1.0" encoding="UTF-8"?> <ContentView xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="WP.MobileMidstream.Device.Pages

问题 I'm trying to create an extended version of the standard XF Map object: public class RRMap: Map { public void DoSomethingOnMap() { /* ... */ } } I also created an Android renderer (iOS will come later): [assembly: ExportRenderer(typeof(RRMap), typeof(RRMapRendererAndroid))] namespace MyApp.Droid.Renderers { public class RRMapRendererAndroid : MapRenderer { public RRMapRendererAndroid(Context context) : base(context) { } protected override void OnElementChanged(Xamarin.Forms.Platform.Android

问题 I have a CarouselPage having 5 children and every child has a horizontal collection view. When selecting an item in Collectionview or swiping the pages, I need to give a different text color and need to add an underline for the selected item. I have tried like below: CarouselHomePage.cs public partial class CarouselHomePage : CarouselPage { public List<Activity> activityList { get; set; } public CarouselHomePage() { InitializeComponent(); activityList = new List<Activity>(); AddActivities();