将javascript注入WebChromeClient [英] Inject javascript into WebChromeClient

问题描述

我知道，您可以将JavaScript注入Android WebView。我已经这样做了。但是，我加载了一个html5 / javascript网络应用程序（不是我自己的，所以我无法访问代码），我需要注入额外的JavaScript。但是这个Web应用程序在标准WebView中无法正常运行。原因可能是：

I know, you can inject javascript into an Android WebView. I already did that. However, I load a html5/javascript web app (not my own, so I have no access to the code) and I need to inject additional javascript. But this web app does not work properly in the standard WebView. The reason for that is probably:

默认情况下，WebView不提供类似浏览器的小部件，不会启用JavaScript和网页错误被忽略。

http://developer.android。 com / reference / android / webkit / WebView.html

所以，我启用了Javascript，但也许这是由于它忽略了网页错误的事实。然而，在普通的Chrome浏览器中，每件事都可以正常运行而没有任何问题

So, I enabled Javascript, but maybe this is due to the fact that it ignores webpage errors. However in the normal Chrome browser everythings works fine without any problems.

尽管我已经启用了很多东西，但webview仍无效：

The webview does not work although I already enabled a lot of stuff:

webView = (WebView) findViewById( R.id.webView );
    webView.getSettings().setJavaScriptEnabled(true);
    webView.getSettings().setPluginState(PluginState.ON);
    webView.getSettings().setDomStorageEnabled(true);
    webView.setBackgroundColor(0x00000000);
    webView.setWebChromeClient( new WebChromeClient() );
    webView.setWebViewClient( new WebViewListener() );
    CookieManager.getInstance().setAcceptCookie(true);

那么，是否有可能将javascript注入普通的WebChromeClient？
或者您还有其他猜测我还能启用或注入到webview中吗？

So, is there some possibility to inject javascript into a normal WebChromeClient? Or do you have any other guess what else I could enable or inject into the webview?

推荐答案

首先，你需要使用从WebViewClient派生的类来设置WebViewClient：

First, you need to setWebViewClient with a class that's derived form WebViewClient:

WebView webview = new WebView();
webview.setWebViewClient(new WebClient());
webview.loadUrl("stackoverflow.com");

然后在WebClient中等待页面加载（onPageFinished）。然后你loadUrl（javascript：[你的javascript在这里]）。

then in WebClient, you wait for the page to load (onPageFinished). Then you loadUrl("javascript:[your javascript here]").

public class WebClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }

    @Override
    public void onPageFinished(WebView view, String url) 
    {       
        // Obvious next step is: document.forms[0].submit()
        view.loadUrl("javascript:document.forms[0].q.value='[android]'");       
    }
}

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