覆盖css文件中声明的android中的字体大小和背景色

Question

Hi all I am using webview in my application. I have css file which sets background color, font size. Now I want to set color and font size at runtime. How to override these properties at runtime in android? I had tried like:

webview.setBackgroundColor(Color.parseColor("#919191"));
WebSettings webSettings = webView.getSettings();
webSettings.setDefaultFontSize(25);

But it does not work. I had also tried to written this code after webView.loadDataWithBaseURL(......)

How to override font and bacground color at runtime?

Answer 1

The settings you mention are defaults. They are only applied if the page doesn't specify anything by itself.

You can manipulate the text size at runtime by using WebSettings.setTextZoom ( doc ) or WebSettings.setMinimumFontSize ( doc ).

There is no API for manipulating background color of the page. The best you can do is running JavaScript code that will do that after the page has loaded. For example:

webview.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageFinished(WebView view, String url){
        view.loadUrl("javascript:document.body.style.backgroundColor = 'black';void(0);");
    }
});