想象一个如下所示的 HTML 模板：
<html>
<head>
<style type="text/css">
body {
color: white;
}
</style>
</head>
<body>
The changes include:
<br/><br/>
%1$s
<br/><br/>
Would you like to update now?
</body>
</html>
我知道我可以使用webView.loadUrl("file:///android_asset/html/upgrade.html") 将内容加载到 WebView 中。但我也想在运行时替换 $1，就像我使用 String.format() 从 XML 文件加载它一样。
是否可以先将文件内容加载到字符串中，以便我可以在其上运行String.format()，然后改用webView.loadData()？
【问题讨论】：
我想出了一个基于this answer to a similar question的解决方案：
String prompt = "";
AssetManager assetManager = getApplicationContext().getResources().getAssets();
try {
InputStream inputStream = assetManager.open("html/upgrade-alert.html");
byte[] b = new byte[inputStream.available()];
inputStream.read(b);
prompt = String.format(new String(b),changes);
inputStream.close();
} catch (IOException e) {
Log.e(LOGTAG, "Couldn't open upgrade-alert.html", e);
}
WebView html = new WebView(this);
html.loadData(prompt,"text/html","utf-8");
【讨论】：
只需在某个字符串中写入整个 html 替换一个要替换的字符串，然后使用 loadData 加载。
http://sriram-iyengar.blogspot.com/2011/05/android-webview-loaddata-and-encoding.html
类似的东西
【讨论】：
您可以使用 HTMLCleaner 从您的 WebView 中获取 HTML 作为 DOM，并通过 TagNodes 更改它。一个如何使用 HTMLCLeaner 获取节点并给出它的某个属性的示例。当然，您应该在 AsyncTask 中执行此操作，以免阻塞 ui。
public static String snapFromCleanedHTMLWithXPath(String stringURL, String xPath, String attrToStrip) {
String snap = "";
// create an instance of HtmlCleaner
HtmlCleaner cleaner = new HtmlCleaner();
// take default cleaner properties
CleanerProperties props = cleaner.getProperties();
props.setAllowHtmlInsideAttributes(true);
props.setAllowMultiWordAttributes(true);
props.setRecognizeUnicodeChars(true);
props.setOmitComments(true);
// open a connection to the desired URL
URL url;
try {
url = new URL(stringURL);
URLConnection conn = url.openConnection();
// use the cleaner to "clean" the HTML and return it as a TagNode object
TagNode root = cleaner.clean(new InputStreamReader(conn.getInputStream()));
Object[] foundNodes = root.evaluateXPath(xPath);
if (foundNodes.length > 0) {
// casted to a TagNode
TagNode foundNode = (TagNode) foundNodes[0];
snap = foundNode.getAttributeByName(attrToStrip);
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XPatherException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
cleaner = null;
props = null;
url = null;
return snap;
}
【讨论】：