How can I load an HTML template into a WebView?
Imagine an HTML template that looks like this:
<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>
I know I can load the contents into a WebView with webView.loadUrl("file:///android_asset/html/upgrade.html"). But I also want to replace the $1 at runtime, just as if I were loading it from an XML file using String.format().
Is it pos开发者_如何转开发sible to load the file contents into a String first so I can run String.format() on it and then use webView.loadData() instead?
I came up with a solution based on this answer to a similar question:
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");
just write whole html in some string replace one string that you want to replace and then load using loadData.
http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/view/WebView1.html
http://sriram-iyengar.blogspot.com/2011/05/android-webview-loaddata-and-encoding.html
something like this
Well you could use HTMLCleaner to get the HTML from your WebView as a DOM and change it via TagNodes. An example how to use HTMLCLeaner to get a node an give out a certain attribute of it. You should do this in an AsyncTask of course, so that it doesn't block the 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;
}
HTMLCLeaner-Website
加载中,请稍侯......
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