从 javascript 示例调用 monodroid 方法答案

【问题标题】：call monodroid method from javascript example从 javascript 示例调用 monodroid 方法
【发布时间】：2013-01-24 07:20:55
【问题描述】：

我正在寻找如何使用 webview 从 javascript 调用 monodroid 方法 (C#) 的示例。

类似：

javascript：

<a href="#" onclick="window.android.callAndroid('Hello from Browser')"> 
   Call Android from JavaScript</a>

public class LocalBrowser extends Activity {
...
   private class MyClass {
      public void callAndroid(final String arg) { 
               textView.setText(arg);
      }
   }
  }

谢谢

【问题讨论】：

标签： mono xamarin.android

【解决方案1】：

这是我用来最终为我解决此问题的示例。迟到总比不到好。

密切注意函数的修饰，并确保在您的引用中包含 Mono.Android.Export。

https://github.com/xamarin/monodroid-samples/blob/master/WebViewJavaScriptInterface/WebViewJavaScriptInterface/JavaScriptInterfaceActivity.cs

using System;

using Android.App;
using Android.Content;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Android.OS;

using Android.Webkit;
using Java.Interop;

namespace WebViewJavaScriptInterface
{
[Activity (Label = "Mono WebView ScriptInterface", MainLauncher = true)]
public class JavaScriptInterfaceActivity : Activity
{
    const string html = @"
<html>
<body>
<p>This is a paragraph.</p>
<button type=""button"" onClick=""Foo.bar('test message')"">Click Me!</button>
</body>
</html>";

    protected override void OnCreate (Bundle bundle)
    {
        base.OnCreate (bundle);

        // Set our view from the "main" layout resource
        SetContentView (Resource.Layout.Main);

        WebView view = FindViewById<WebView> (Resource.Id.web);
        view.Settings.JavaScriptEnabled = true;
        view.SetWebChromeClient (new WebChromeClient ());
        view.AddJavascriptInterface (new Foo (this), "Foo");
        view.LoadData (html, "text/html", null);
    }
}

class Foo : Java.Lang.Object
{
    public Foo (Context context)
    {
        this.context = context;
    }

    public Foo (IntPtr handle, JniHandleOwnership transfer)
        : base (handle, transfer)
    {
    }

    Context context;

    [Export ("bar")]
    // to become consistent with Java/JS interop convention, the argument cannot be System.String.
    public void Bar (Java.Lang.String message)
    {
        Console.WriteLine ("Foo.Bar invoked!");
        Toast.MakeText (context, "This is a Toast from C#! " + message, ToastLength.Short).Show ();
    }
}

}

【讨论】：