Android Activity 到 WebView 和 WebView 到 Activity 参数传递 [英] Android Activity to WebView and WebView to Activity Parameter Passing

问题描述

我有一个应用程序，其中的活动与我们的服务器通信并获取未结金额的详细信息.我希望用户使用支付网关支付未付金额.对于支付网关，我必须从 webview 调用网页并将未结金额详细信息和其他凭据从活动传输到 webview 中加载的页面.在交易结束时，我再次需要从 webview 中的网页获取一些参数到活动.

I have an application in which an activity communicates with our server and gets the outstanding amount details. I want users to pay the outstanding amount using a payment gateway. for Payment Gateway, I have to call web page from webview and transfer outstanding amount details and other credentials from activity to the page loaded in webview. At the end of transaction I once again need to get some parameters back from webpage in webview to activity.

这是我想要在活动和 webview 中加载的页面之间实现的双向通信.我试图找到一种方法来做到这一点，但找不到一个简单的例子来进行这种交换.

This is a two way communication which I want to achieve between an activity and a page loaded in webview. I tried to find out a way to do it but could not find a simple example which does such exchange.

推荐答案

您可以使用演示的 javascript WebAppInterface 实现您想要的此处.

You could achieve what you want using a javascript WebAppInterface as demonstrated here.

主要概念是，您在包含 WebView 的 Activity 中创建一个 javascript 界面.

The main concept is that, you create a javascript interface inside the Activity holding your WebView.

private class WebPayInterface {
    int amount;
    boolean success;

    @JavascriptInterface
    public void PaymentFinished(int amount, boolean success) {
        this.amount = amount;
        this.success = success;

        // do whatever you want in the parent activity.
    }
}

将界面添加到您的 webView

Add the interface to your webView

webView.addJavascriptInterface(new WebPayInterface(), "WebPayInterface");

最后在使用 javascript 的 html 代码中，您可以调用

Finally in your html code using javascript you can call

WebPayInterface.PaymentFinished(100, true);

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