MainActivity
namespace Xamarin.Android
{
public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
{
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
LoadApplication(new App());
//Add this line
await Permissions.RequestAsync<BLEPermission>();
}
}
}
BLEPermission Class
public class BLEPermission : Xamarin.Essentials.Permissions.BasePlatformPermission
{
public override (string androidPermission, bool isRuntime)[] RequiredPermissions => new List<(string androidPermission, bool isRuntime)>
{
(Android.Manifest.Permission.BluetoothScan, true),
(Android.Manifest.Permission.BluetoothConnect, true)
}.ToArray();
}
AndroidManifest.xml
<uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" /> <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" /> <uses-permission android:name="android.permission.BLUETOOTH_SCAN" android:usesPermissionFlags="neverForLocation" /> <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" android:maxSdkVersion="30" /> <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" /> <uses-permission android:name="android.permission.BLUETOOTH_PRIVILEGED" /> <uses-feature android:name="android.hardware.bluetooth" android:required="false" /> <uses-feature android:name="android.hardware.bluetooth_le" android:required="false" /> <uses-feature android:name="android.hardware.location" android:required="false" /> <uses-feature android:name="android.hardware.location.gps" android:required="false" /> <uses-feature android:name="android.hardware.location.network" android:required="false" />
Xamarin.Android :
var cookieManager = CookieManager.Instance; cookieManager.RemoveAllCookie();
Xamarin.iOS :
NSHttpCookieStorage CookieStorage = NSHttpCookieStorage.SharedStorage;
foreach (var cookie in CookieStorage.Cookies) {
CookieStorage.DeleteCookie(cookie);
}
Xamarin Forms page
webView.Source = "https://example.com";
Xamarin.Android
[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
namespace YourAppNamespace.Droid
{
public class HybridWebViewRenderer : WebViewRenderer
{
public HybridWebViewRenderer(Context context) : base(context) { }
protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
{
base.OnElementChanged(e);
if (Control != null)
{
Control.SetWebViewClient(new CustomWebViewClient());
}
}
}
public class CustomWebViewClient : WebViewClient
{
public override void OnReceivedError(WebView view, WebResourceRequest request, WebResourceError error)
{
string customErrorPage = "<html><body><h1>Page Not Found</h1><p>Oops! Something went wrong.</p></body></html>";
view.LoadData(customErrorPage, "text/html", "UTF-8");
}
public override void OnReceivedError(WebView view, ClientError errorCode, string description, string failingUrl)
{
string customErrorPage = "<html><body><h1>Page Not Found</h1><p>Oops! Something went wrong.</p></body></html>";
view.LoadData(customErrorPage, "text/html", "UTF-8");
}
}
}
Xamarin.iOS
[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
namespace YourAppNamespace.iOS
{
public class HybridWebViewRenderer : WkWebViewRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
{
base.OnElementChanged(e);
if (Control != null)
{
Control.NavigationDelegate = new CustomNavigationDelegate();
}
}
}
public class CustomNavigationDelegate : WKNavigationDelegate
{
public override void DidFailNavigation(WKWebView webView, WKNavigation navigation, NSError error)
{
string customErrorPage = "<html><body><h1>Page Not Found</h1><p>Oops! Something went wrong.</p></body></html>";
webView.LoadHtmlString(customErrorPage, null);
}
public override void DidFailProvisionalNavigation(WKWebView webView, WKNavigation navigation, NSError error)
{
string customErrorPage = "<html><body><h1>Page Not Found</h1><p>Oops! Something went wrong.</p></body></html>";
webView.LoadHtmlString(customErrorPage, null);
}
}
}
Xamarin Forms project
public interface IKeyboardHelper
{
void HideKeyboard();
}
Xamarin Forms page
DependencyService.Get<IKeyboardHelper>().HideKeyboard();
Xamarin.Android
using System;
using Xamarin.Forms;
using ProjectName;
using ProjectName.Droid;
using Xamarin.Forms.Platform.Android;
using Android.Views.InputMethods;
using Android.App;
using Android.Content;
[assembly: Xamarin.Forms.Dependency(typeof(DroidKeyboardHelper))]
namespace ProjectName.Droid
{
public class DroidKeyboardHelper : IKeyboardHelper
{
public void HideKeyboard()
{
var context = Android.App.Application.Context;
var inputMethodManager = context.GetSystemService(Context.InputMethodService) as InputMethodManager;
if (inputMethodManager != null && context is Activity)
{
var activity = context as Activity;
var token = activity.CurrentFocus?.WindowToken;
inputMethodManager.HideSoftInputFromWindow(token, HideSoftInputFlags.None);
activity.Window.DecorView.ClearFocus();
}
}
}
}
Xamarin.iOS
using System;
using Xamarin.Forms;
using ProjectName;
using ProjectName.iOS;
using UIKit;
[assembly: Dependency(typeof(iOSKeyboardHelper))]
namespace ProjectName.iOS
{
public class iOSKeyboardHelper : IKeyboardHelper
{
public void HideKeyboard()
{
UIApplication.SharedApplication.KeyWindow.EndEditing(true);
}
}
}
AndroidManifest.xml
<application //Add this attribute android:windowSoftInputMode="adjustResize" </application>
.NET standard application
MainPage.xaml.cs
public partial class MainPage : ContentPage
{
IDownloader downloader = DependencyService.Get<IDownloader>();
public MainPage()
{
InitializeComponent();
downloader.OnFileDownloaded += Downloader_OnFileDownload;
}
private void Downloader_OnFileDownload(object sender, DownloadEventArgs e)
{
if (e.FileSaved)
{
//File Saved Successfully. Do some action.
}
else
{
//Error while saving the file. Do some action.
}
}
//download method
protected void DownloadMethod()
{
downloader.DownloadFile("url of the download item");
}
}
IDownloader.cs
namespace Xamarin
{
public interface IDownloader
{
void DownloadFile(string url);
event EventHandler<DownloadEventArgs> OnFileDownloaded;
}
public class DownloadEventArgs : EventArgs
{
public bool FileSaved = false;
public DownloadEventArgs(bool fileSaved)
{
FileSaved = fileSaved;
}
}
}
Android App
AndroidDownloader.cs
[assembly: Dependency(typeof(AndroidDownloader))]
namespace Xamarin.Droid
{
public class AndroidDownloader : IDownloader
{
public event EventHandler<DownloadEventArgs> OnFileDownloaded;
public void DownloadFile(string url)
{
var context = Android.App.Application.Context;
var pathToNewFolder = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, Android.OS.Environment.DirectoryDownloads);
if (!Directory.Exists(pathToNewFolder))
{
_ = Directory.CreateDirectory(pathToNewFolder);
}
try
{
Uri uri = new UriBuilder(url).Uri;
WebClient webClient = new WebClient();
ServicePointManager.ServerCertificateValidationCallback = new
RemoteCertificateValidationCallback
(
delegate { return true; }
);
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
string pathToNewFile = Path.Combine(pathToNewFolder, Path.GetFileName(url));
webClient.DownloadFileAsync(uri, pathToNewFile);
webClient.Dispose();
}
catch(Exception)
{
if(OnFileDownloaded != null)
{
OnFileDownloaded.Invoke(this, new DownloadEventArgs(false));
}
}
}
private void Completed(object sender, AsyncCompletedEventArgs e)
{
if(e.Error != null)
{
if (OnFileDownloaded != null)
{
OnFileDownloaded.Invoke(this, new DownloadEventArgs(false));
}
}
else
{
if (OnFileDownloaded != null)
{
OnFileDownloaded.Invoke(this, new DownloadEventArgs(true));
}
}
}
}
}
AndroidManifest.xml
Add the following two permissions:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.INTERNET" />
iOS App
IosDownloader.cs
[assembly: Dependency(typeof(IosDownloader))]
namespace Xamarin.iOS
{
public class IosDownloader : IDownloader
{
public event EventHandler<DownloadEventArgs> OnFileDownloaded;
public void DownloadFile(string url)
{
string pathToNewFolder = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal));
if (!Directory.Exists(pathToNewFolder))
{
_ = Directory.CreateDirectory(pathToNewFolder);
}
try
{
Uri uri = new UriBuilder(url).Uri;
WebClient webClient = new WebClient();
ServicePointManager.ServerCertificateValidationCallback = new
RemoteCertificateValidationCallback
(
delegate { return true; }
);
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
string pathToNewFile = Path.Combine(pathToNewFolder, Path.GetFileName(url));
webClient.DownloadFileAsync(uri, pathToNewFile);
webClient.Dispose();
}
catch (Exception)
{
if (OnFileDownloaded != null)
{
OnFileDownloaded.Invoke(this, new DownloadEventArgs(false));
}
}
}
private void Completed(object sender, AsyncCompletedEventArgs e)
{
if (e.Error != null)
{
if (OnFileDownloaded != null)
{
OnFileDownloaded.Invoke(this, new DownloadEventArgs(false));
}
}
else
{
if (OnFileDownloaded != null)
{
OnFileDownloaded.Invoke(this, new DownloadEventArgs(true));
}
}
}
}
}
Info.plist
Add the following two permissions:
<key>Privacy - Media Library Usage Description</key> <string>The app requires access to media.</string> <key>Privacy - Photo Library Usage Description</key> <string>The app requires access to photo.</string> <key>Privacy - Photo Library Additions Usage Description</key> <string>The app requires access to photo gallery.</string>
You must reboot your iPhone for the changes to take effect.
Prerequisites:
Visual Studio Users: