在Android Xamarin CrossWalk Webview中调用Javascript中的C#函数

dependencies {
    implementation 'org.xwalk:xwalk_core_library:23.53.589.4'
}

using Org.Xwalk.Core;

// ...

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

    // ...

    // 初始化CrossWalk WebView
    XWalkPreferences.SetValue(XWalkPreferences.EnableJavascriptInterface, true);
    XWalkPreferences.SetValue(XWalkPreferences.JavascriptCanOpenWindowsAutomatically, true);

    var webView = new XWalkView(this, this);
    SetContentView(webView);

    // ...
}

using Android.App;
using Android.Widget;
using Java.Interop;

namespace YourNamespace
{
    public class JavaScriptInterface : Java.Lang.Object
    {
        private readonly Activity _activity;

        public JavaScriptInterface(Activity activity)
        {
            _activity = activity;
        }

        [Export("showToast")]
        public void ShowToast(string message)
        {
            Toast.MakeText(_activity, message, ToastLength.Short).Show();
        }
    }
}

// ...

var webView = new XWalkView(this, this);
SetContentView(webView);

// 添加Javascript接口
var jsInterface = new JavaScriptInterface(this);
webView.AddJavascriptInterface(jsInterface, "jsInterface");

// ...

jsInterface.showToast("Hello from Javascript!");