hybrid web view and duo html/js

2025-12-25 12:43:39 +00:00 · 2017-06-28 10:09:52 -04:00
parent 45c5801538
commit d71bc775d5
8 changed files with 801 additions and 136 deletions
--- a/src/Android/Controls/HybridWebViewRenderer.cs
+++ b/src/Android/Controls/HybridWebViewRenderer.cs
@@ -0,0 +1,72 @@
+using System;
+using Bit.Android.Controls;
+using Bit.App.Controls;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.Android;
+using Android.Webkit;
+using AWebkit = Android.Webkit;
+using Java.Interop;
+
+[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
+namespace Bit.Android.Controls
+{
+    public class HybridWebViewRenderer : ViewRenderer<HybridWebView, AWebkit.WebView>
+    {
+        private const string JSFunction = "function invokeCSharpAction(data){jsBridge.invokeAction(data);}";
+
+        protected override void OnElementChanged(ElementChangedEventArgs<HybridWebView> e)
+        {
+            base.OnElementChanged(e);
+
+            if(Control == null)
+            {
+                var webView = new AWebkit.WebView(Forms.Context);
+                webView.Settings.JavaScriptEnabled = true;
+                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);
+                InjectJS(JSFunction);
+            }
+        }
+
+        private void InjectJS(string script)
+        {
+            if(Control != null)
+            {
+                Control.LoadUrl(string.Format("javascript: {0}", script));
+            }
+        }
+
+        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)
+            {
+                HybridWebViewRenderer hybridRenderer;
+                if(_hybridWebViewRenderer != null && _hybridWebViewRenderer.TryGetTarget(out hybridRenderer))
+                {
+                    hybridRenderer.Element.InvokeAction(data);
+                }
+            }
+        }
+    }
+}