stringByEvaluatingJavascriptFromString（iOS的方法，什么是Android的相同呢？） [英] stringByEvaluatingJavascriptFromString (iOS method, what is Android equivalent?)

问题描述

在iOS应用程序，我用

In an iOS app, I used

stringFromJavaScript = [webView stringByEvaluatingJavascriptFromString:@"document.getElementById(\"image\").getAttribute(\"src")"];

要获得被显示在web视图图像的src目录。我想要做同样为Android。我有什么选择？

To get the src directory of the image that was being displayed on the webView. I want to do the same for Android. What are my options?

基本上的目的是为了获取路径，这样我可以通过电子邮件发送同样的图片...

Basically the intent is to capture the path so that I can email this same picture...

即

"picture.php?image=%@",stringFromJavascript

这样一来，同样的图像会在用户点击链接，或者其发布至Facebook等。

This way, that same image would be loaded when the user clicks the link, or posts it to facebook etc.

推荐答案

是啊，我在Android中非常怀念这种方法）

Yeah, I miss this method greatly in Android ;)

要执行JavaScript，并得到回应，你可以做如下：

To execute JavaScript and get response you can do as follows:

1. 定义在code JavaScript回调接口：

1. Define JavaScript callback interface in your code:

class MyJavaScriptInterface {
    @JavascriptInterface
    public void someCallback(String jsResult) {
         // your code...
    }
}

附加此回调到您的WebView

Attach this callback to your WebView

MyJavaScriptInterface javaInterface = new MyJavaScriptInterface();
yourWebView.addJavascriptInterface(javaInterface, "HTMLOUT");

运行你的JavaScript调用 window.HTMLOUT.someCallback 从脚本：

Run your JavaScript calling window.HTMLOUT.someCallback from the script:

yourWebView.loadUrl("javascript:( function () { var resultSrc = document.getElementById(\"image\").getAttribute(\"src\"); window.HTMLOUT.someCallback(resultSrc); } ) ()");

希望这有助于！

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