javascript – WebView.loadUrl()中的Android JS

我想在WebView中加载一个网页,但删除部分网页.所以,我创建了一个自定义WebViewClient.并且,在onPageFinished()中,我做了一些 javascript来删除一些元素.然后,我使WebView可见.

但是,当我运行它时,它将视图设置为可见,然后我看到要删除的元素.就好像JS在后台运行非常慢.它会创建一个糟糕的观看体验,因为它会闪烁整个页面,然后闪烁所需的部分页面.

这是我的onPageFinished()

@Override
public void onPageFinished(WebView view,String url) {

    view.loadUrl("javascript:"
            + "document.getElementsByClassName('header')[0].style.display='none';"
            + "document.getElementById('section_0').style.display='none';"
            + "document.getElementById('page-actions').style.display='none';"
            + "document.getElementsByClassName('languageSelector')[0].style.display='none';"
            + "document.getElementById('mw-mf-last-modified').style.display='none';"
            + "document.getElementById('footer').style.display='none';");

    loadingView.setVisibility(View.INVISIBLE);
    view.setVisibility(View.VISIBLE);
}

有想法该怎么解决这个吗？

解决方法

在onPageFinished()中：

view.loadUrl("javascript:"
            + "var FunctionOne = function () {"
            + "  var r = $.Deferred();"
            + "  try{document.getElementsByClassName('header')[0].style.display='none';}catch(e){}"
            + "  try{document.getElementById('section_0').style.display='none';}catch(e){}"
            + "  try{document.getElementById('page-actions').style.display='none';}catch(e){}"
            + "  try{document.getElementsByClassName('languageSelector')[0].style.display='none';}catch(e){}"
            + "  try{document.getElementById('mw-mf-last-modified').style.display='none';}catch(e){}"
            + "  try{document.getElementById('footer').style.display='none';}catch(e){}"
            + "  setTimeout(function () {"
            + "    r.resolve();"
            + "  },2500);"
            + "  return r;"
            + "};"
            + "var FunctionTwo = function () {"
            + "  window.CallToAnAndroidFunction.setVisible();"
            + "};"
            + "FunctionOne().done(FunctionTwo);");

在MainActivity.onCreate()中：

this.webView.addJavascriptInterface(new JsObject(webView,loadingView),"CallToAnAndroidFunction");

在MainActivity()中：

public class JsObject {
    private View loadingView;
    private View view;
    JsObject(View view,View loadingView){this.view = view;this.loadingView = loadingView;}
    @JavascriptInterface
    public void setVisible(){
        runOnUiThread(new Runnable() {

           @Override
           public void run() {
               view.setVisibility(View.VISIBLE);  
                loadingView.setVisibility(View.INVISIBLE);               
           }
       });
    }
}

因此,它是一个组合JavascriptInterface和制作JS函数来等待JS调用完成之后调用接口(具有可见性设置).