hybrid webview

2025-12-11 05:43:30 +00:00 · 2019-05-23 21:05:52 -04:00
parent bfa336b72d
commit 23f27282d6
5 changed files with 176 additions and 0 deletions
--- a/src/Android/Renderers/HybridWebViewRenderer.cs
+++ b/src/Android/Renderers/HybridWebViewRenderer.cs
@@ -0,0 +1,88 @@
+using System;
+using Bit.App.Controls;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.Android;
+using Android.Webkit;
+using AWebkit = Android.Webkit;
+using Java.Interop;
+using Android.Content;
+using Bit.Droid.Renderers;
+
+[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
+namespace Bit.Droid.Renderers
+{
+    public class HybridWebViewRenderer : ViewRenderer<HybridWebView, AWebkit.WebView>
+    {
+        private const string JSFunction = "function invokeCSharpAction(data){jsBridge.invokeAction(data);}";
+
+        private readonly Context _context;
+
+        public HybridWebViewRenderer(Context context)
+            : base(context)
+        {
+            _context = context;
+        }
+
+        protected override void OnElementChanged(ElementChangedEventArgs<HybridWebView> e)
+        {
+            base.OnElementChanged(e);
+
+            if(Control == null)
+            {
+                var webView = new AWebkit.WebView(_context);
+                webView.Settings.JavaScriptEnabled = true;
+                webView.SetWebViewClient(new JSWebViewClient(string.Format("javascript: {0}", JSFunction)));
+                SetNativeControl(webView);
+            }
+            if(e.OldElement != null)
+            {
+                Control.RemoveJavascriptInterface("jsBridge");
+                var hybridWebView = e.OldElement as HybridWebView;
+                hybridWebView.Cleanup();
+            }
+            if(e.NewElement != null)
+            {
+                Control.AddJavascriptInterface(new JSBridge(this), "jsBridge");
+                Control.LoadUrl(Element.Uri);
+            }
+        }
+
+        public class JSBridge : Java.Lang.Object
+        {
+            private readonly WeakReference<HybridWebViewRenderer> _hybridWebViewRenderer;
+
+            public JSBridge(HybridWebViewRenderer hybridRenderer)
+            {
+                _hybridWebViewRenderer = new WeakReference<HybridWebViewRenderer>(hybridRenderer);
+            }
+
+            [JavascriptInterface]
+            [Export("invokeAction")]
+            public void InvokeAction(string data)
+            {
+                if(_hybridWebViewRenderer != null &&
+                    _hybridWebViewRenderer.TryGetTarget(out HybridWebViewRenderer hybridRenderer))
+                {
+                    hybridRenderer.Element.InvokeAction(data);
+                }
+            }
+        }
+
+        public class JSWebViewClient : WebViewClient
+        {
+            private readonly string _javascript;
+
+            public JSWebViewClient(string javascript)
+            {
+                _javascript = javascript;
+
+            }
+
+            public override void OnPageFinished(AWebkit.WebView view, string url)
+            {
+                base.OnPageFinished(view, url);
+                view.EvaluateJavascript(_javascript, null);
+            }
+        }
+    }
+}