Xamarin - 在 WebView 中请求相机权限 [英] Xamarin - Requesting camera permissions in WebView
问题描述
我想为我的 Web 应用程序制作一个容器应用程序，我决定在 Xamarin 中这样做，因为项目的其余部分也是 .NET.
最初我从 Xamarin 示例页面下载并设置了项目:
我已经上传到我的 GitHub 上了.检查文件夹.测试/CameraRuntimePermission_WebView/RuntimePermission
I want to make a container-app for my web application, and I decided to do so in Xamarin because the rest of the project is also .NET.
Initially I downloaded and setup the project from Xamarin Sample Pages: https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/webview?tabs=windows
I simply changed a few variables in WebPage.cs: https://github.com/xamarin/xamarin-forms-samples/blob/master/WorkingWithWebview/WorkingWithWebview/WebPage.cs
using Xamarin.Forms;
namespace WorkingWithWebview
{
public class WebPage : ContentPage
{
public WebPage()
{
var browser = new WebView();
browser.Source = "https://xamarin.swappsdev.net";
Content = browser;
}
}
}
Secondly I updated App.cs to suit my needs: https://github.com/xamarin/xamarin-forms-samples/blob/master/WorkingWithWebview/WorkingWithWebview/App.
using Xamarin.Forms;
namespace WorkingWithWebview
{
public class App : Application
{
public App ()
{
MainPage = new WebPage();
}
}
}
And boom! I had an app.
Then came the real struggle. In the web application I can – when opening the site (https://xamarin.swappsdev.net) in the browser – click on a button which requests permissions from the device and then display the camera feed in the same window.
When doing the same action in the app nothing happens.
I then started googling for an answer and really didn’t find a lot. And the answers I found seems to be of an older version of Xamarin (?), since I wasn’t able to compare the files and structure in the answer compared to the one of the Xamarin Sample Page. https://stackoverflow.com/a/50560855
I tried implementing the answer from Robbit here. After a long struggle I managed to compile it and install it on my device but it doesn't actually ask for permissions.
I am at a loss and could need some help/guidance.
Updated:
In my previous answer, it shows how to add camera permission on webview.
The link you provided, it works now. https://xamarin.swappsdev.net/ It seems to provide a camera preview function. It need to check permissions on API 23+.
On Xamarin.Forms, you could use Permissions Plugin. https://github.com/jamesmontemagno/PermissionsPlugin
First, add the camera permission in Android Manifest. Your Project.Android> Properties> Android Manifest> Required permissions> Camera. After that, it would generate the user permission in AndroidManifest.xml.
<uses-permission android:name="android.permission.CAMERA" />
Create a Utils.cs.
public static class Utils
{
public static async Task<PermissionStatus> CheckPermissions(Permission permission)
{
var permissionStatus = await CrossPermissions.Current.CheckPermissionStatusAsync(permission);
bool request = false;
if (permissionStatus == PermissionStatus.Denied)
{
if (Device.RuntimePlatform == Device.iOS)
{
var title = $"{permission} Permission";
var question = $"To use this plugin the {permission} permission is required. Please go into Settings and turn on {permission} for the app.";
var positive = "Settings";
var negative = "Maybe Later";
var task = Application.Current?.MainPage?.DisplayAlert(title, question, positive, negative);
if (task == null)
return permissionStatus;
var result = await task;
if (result)
{
CrossPermissions.Current.OpenAppSettings();
}
return permissionStatus;
}
request = true;
}
if (request || permissionStatus != PermissionStatus.Granted)
{
var newStatus = await CrossPermissions.Current.RequestPermissionsAsync(permission);
if (!newStatus.ContainsKey(permission))
{
return permissionStatus;
}
permissionStatus = newStatus[permission];
if (newStatus[permission] != PermissionStatus.Granted)
{
permissionStatus = newStatus[permission];
var title = $"{permission} Permission";
var question = $"To use the plugin the {permission} permission is required.";
var positive = "Settings";
var negative = "Maybe Later";
var task = Application.Current?.MainPage?.DisplayAlert(title, question, positive, negative);
if (task == null)
return permissionStatus;
var result = await task;
if (result)
{
CrossPermissions.Current.OpenAppSettings();
}
return permissionStatus;
}
}
return permissionStatus;
}
}
In MainActivity.cs, add the code in OnCreate method.
Plugin.CurrentActivity.CrossCurrentActivity.Current.Init(this, savedInstanceState);
OnRequestPermissionsResult is needed in MainActivity.cs.
public override void OnRequestPermissionsResult(int requestCode, string[] permissions,
[GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
And then impletement it.
private async void _button_Clicked(object sender, EventArgs e)
{
webView.Source = "https://xamarin.swappsdev.net/";//"https://test.webrtc.org/";
var status = PermissionStatus.Unknown;
status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Camera);
if (status != PermissionStatus.Granted)
{
status = await Utils.CheckPermissions(Permission.Camera);
}
}
I have upload on my GitHub. Check the folder. Test/CameraRuntimePermission_WebView/RuntimePermission
https://github.com/WendyZang/Test.git
Edit:
If you do not want to call this in button click event, you could delete the button in MainPage.xaml.
MainPage.xaml.cs
public MainPage()
{
InitializeComponent();
webView.Source = "https://xamarin.swappsdev.net/";
}
protected override void OnAppearing()
{
base.OnAppearing();
RunTimePermission();
}
public async void RunTimePermission()
{
var status = PermissionStatus.Unknown;
status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Camera);
if (status != PermissionStatus.Granted)
{
status = await Utils.CheckPermissions(Permission.Camera);
}
}
这篇关于Xamarin - 在 WebView 中请求相机权限的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
