使用webView.AddJavascriptInterface与MonoDroid的 [英] Using webView.AddJavascriptInterface with MonoDroid

问题描述

我使用MonoDroid的，并想使C＃code从我的WebView调用。

I'm using MonoDroid, and would like to make C# code callable from my WebView.

我这样做（C＃）：

protected override void OnCreate(Bundle bundle)
{
        [...]
        LinearLayout layout = FindViewById<LinearLayout>(Resource.Id.MyLayout);
        var webView = new WebView(this);
        webView.SetWebChromeClient(new WebChromeClient());
        webView.Settings.JavaScriptEnabled = true;
        webView.AddJavascriptInterface(new JSAccesibleObject(), "cSharpObject");
        webView.LoadUrl("file:///android_asset/test.html");
        layout.AddView(webView);
}

public class JSAccesibleObject : Java.Lang.Object
{
        public void method1()
        {

        }
}

在Javascript中，cSharpObject定义，但它没有属性。

In Javascript, cSharpObject is defined, but it has no properties.

alert(cSharpObject); //mynamespace.Activity1_JSAccesibleObjec@f4438fe8
for (var prop in cSharpObject) 
    alert(prop); //this never gets called
alert(cSharpObject.method1) //undefined
alert(cSharpObject.method1()) //fails

难道我做错了什么，或者这是否只是没有在MonoDroid的工作？

Am I doing something wrong, or does this just not work in MonoDroid?

推荐答案

A）加入[导出]属性上你的方法。

A) Add the [Export] attribute on your method.

B）在xamarian网站：
的http://docs.xamarin.com/android/recipes/Controls/WebView/Call_C%23_from_JavaScript

B) On xamarian website: http://docs.xamarin.com/android/recipes/Controls/WebView/Call_C%23_from_JavaScript

c）写一个.java文件的JavaScriptInterface类型，包括将.java
文件中有AndroidJavaSource建设行动项目，并在Activity1.OnCreate（），这样做：

C) write your JavaScriptInterface type in a .java file, include the .java file in your project with a AndroidJavaSource Build action, and in Activity1.OnCreate(), do:

IntPtr JavaScriptInterface_Class = JNIEnv.FindClass ("the/package/for/JavaScriptInterface");
// TODO: Update "the/package/for" as appropriate for your type.
IntPtr JavaScriptInterface_ctor = JNIEnv.GetMethodID (JavaScriptInterface_Class, "<init>", "()V");
IntPtr instance = JNIEnv.NewObject (JavaScriptInterface_Class, JavaScriptInterface_ctor);

appView.AddJavascriptInterface (new Java.Lang.Object (instance), "Android");

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