从Web级别11开始，Android的WebView具有此saveWebArchive方法：http://developer.android.com/。
它可以将整个网站保存为webarchives，这太棒了！但是如何将下载的内容恢复到webview中？我试过了
webview.loadUrl(Uri.fromFile(mywebarchivefile));
但是只在屏幕上显示xml。
答案 0 :(得分：25)
我在下面发布的答案不适用于在Android 4.4 KitKat及更新版本下保存的网络存档文件。 Android 4.4“KitKat”下的WebView的saveWebArchive（）方法（也可能是更新版本）不会将此存档文件保存在此读者代码下面发布的XML代码中。相反，它以MHT（MHTML）格式保存页面。回读.mht文件很容易 - 只需使用：
webView.loadUrl("file:///my_dir/mySavedWebPage.mht");
这一切都比以前的方法容易得多，并且与其他平台兼容。
我自己需要它，而且在我搜索过的每个地方，都有这样的未解答的问题。所以我必须自己解决这个问题。下面是我的小WebArchiveReader类以及如何使用它的示例代码。请注意，尽管Android文档声明在API11（Honeycomb）中将shouldInterceptRequest（）添加到WebViewClient，但此代码可以在Android模拟器中成功测试，直到API8（Froyo）。下面是所有需要的代码，我还将整个项目上传到https://github.com/gregko/WebArchiveReader的GitHub存储库
File WebArchiveReader.java：
package com.hyperionics.war_test;
import android.util.Base64;
import android.webkit.WebResourceResponse;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.ArrayList;
public abstract class WebArchiveReader {
private Document myDoc = null;
private static boolean myLoadingArchive = false;
private WebView myWebView = null;
private ArrayList<String> urlList = new ArrayList<String>();
private ArrayList<Element> urlNodes = new ArrayList<Element>();
abstract void onFinished(WebView webView);
public boolean readWebArchive(InputStream is) {
DocumentBuilderFactory builderFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
myDoc = null;
try {
builder = builderFactory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
e.printStackTrace();
}
try {
myDoc = builder.parse(is);
NodeList nl = myDoc.getElementsByTagName("url");
for (int i = 0; i < nl.getLength(); i++) {
Node nd = nl.item(i);
if(nd instanceof Element) {
Element el = (Element) nd;
// siblings of el (url) are: mimeType, textEncoding, frameName, data
NodeList nodes = el.getChildNodes();
for (int j = 0; j < nodes.getLength(); j++) {
Node node = nodes.item(j);
if (node instanceof Text) {
String dt = ((Text)node).getData();
byte[] b = Base64.decode(dt, Base64.DEFAULT);
dt = new String(b);
urlList.add(dt);
urlNodes.add((Element) el.getParentNode());
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
myDoc = null;
}
return myDoc != null;
}
private byte [] getElBytes(Element el, String childName) {
try {
Node kid = el.getFirstChild();
while (kid != null) {
if (childName.equals(kid.getNodeName())) {
Node nn = kid.getFirstChild();
if (nn instanceof Text) {
String dt = ((Text)nn).getData();
return Base64.decode(dt, Base64.DEFAULT);
}
}
kid = kid.getNextSibling();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public boolean loadToWebView(WebView v) {
myWebView = v;
v.setWebViewClient(new WebClient());
WebSettings webSettings = v.getSettings();
webSettings.setDefaultTextEncodingName("UTF-8");
myLoadingArchive = true;
try {
// Find the first ArchiveResource in myDoc, should be <ArchiveResource>
Element ar = (Element) myDoc.getDocumentElement().getFirstChild().getFirstChild();
byte b[] = getElBytes(ar, "data");
// Find out the web page charset encoding
String charset = null;
String topHtml = new String(b).toLowerCase();
int n1 = topHtml.indexOf("<meta http-equiv=\"content-type\"");
if (n1 > -1) {
int n2 = topHtml.indexOf('>', n1);
if (n2 > -1) {
String tag = topHtml.substring(n1, n2);
n1 = tag.indexOf("charset");
if (n1 > -1) {
tag = tag.substring(n1);
n1 = tag.indexOf('=');
if (n1 > -1) {
tag = tag.substring(n1+1);
tag = tag.trim();
n1 = tag.indexOf('\"');
if (n1 < 0)
n1 = tag.indexOf('\'');
if (n1 > -1) {
charset = tag.substring(0, n1).trim();
}
}
}
}
}
if (charset != null)
topHtml = new String(b, charset);
else
topHtml = new String(b);
String baseUrl = new String(getElBytes(ar, "url"));
v.loadDataWithBaseURL(baseUrl, topHtml, "text/html", "UTF-8", null);
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
private class WebClient extends WebViewClient {
@Override
public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
if (!myLoadingArchive)
return null;
int n = urlList.indexOf(url);
if (n < 0)
return null;
Element parentEl = urlNodes.get(n);
byte [] b = getElBytes(parentEl, "mimeType");
String mimeType = b == null ? "text/html" : new String(b);
b = getElBytes(parentEl, "textEncoding");
String encoding = b == null ? "UTF-8" : new String(b);
b = getElBytes(parentEl, "data");
return new WebResourceResponse(mimeType, encoding, new ByteArrayInputStream(b));
}
@Override
public void onPageFinished(WebView view, String url)
{
// our WebClient is no longer needed in view
view.setWebViewClient(null);
myLoadingArchive = false;
onFinished(myWebView);
}
}
}
以下是如何使用此类，示例MyActivity.java类：
package com.hyperionics.war_test;
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import java.io.IOException;
import java.io.InputStream;
public class MyActivity extends Activity {
// Sample WebViewClient in case it was needed...
// See continueWhenLoaded() sample function for the best place to set it on our webView
private class MyWebClient extends WebViewClient {
@Override
public void onPageFinished(WebView view, String url)
{
Lt.d("Web page loaded: " + url);
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
WebView webView = (WebView) findViewById(R.id.webView);
try {
InputStream is = getAssets().open("TestHtmlArchive.xml");
WebArchiveReader wr = new WebArchiveReader() {
void onFinished(WebView v) {
// we are notified here when the page is fully loaded.
continueWhenLoaded(v);
}
};
// To read from a file instead of an asset, use:
// FileInputStream is = new FileInputStream(fileName);
if (wr.readWebArchive(is)) {
wr.loadToWebView(webView);
}
} catch (IOException e) {
e.printStackTrace();
}
}
void continueWhenLoaded(WebView webView) {
Lt.d("Page from WebArchive fully loaded.");
// If you need to set your own WebViewClient, do it here,
// after the WebArchive was fully loaded:
webView.setWebViewClient(new MyWebClient());
// Any other code we need to execute after loading a page from a WebArchive...
}
}
为了完成任务，这里是我用于调试输出的小Lt.java类：
package com.hyperionics.war_test;
import android.util.Log;
public class Lt {
private static String myTag = "war_test";
private Lt() {}
static void setTag(String tag) { myTag = tag; }
public static void d(String msg) {
// Uncomment line below to turn on debug output
Log.d(myTag, msg == null ? "(null)" : msg);
}
public static void df(String msg) {
// Forced output, do not comment out - for exceptions etc.
Log.d(myTag, msg == null ? "(null)" : msg);
}
}
希望这有用。
某些网页没有指定文本编码的元标记，然后我们上面显示的代码无法正确显示字符。在这段代码的GitHub版本中，我现在添加了字符集检测算法，在这种情况下猜测编码。再次，请参阅https://github.com/gregko/WebArchiveReader
格雷格
答案 1 :(得分：17)
我找到了一种无证的方式来阅读已保存的webarchive。只是做：
String raw_data = (read the mywebarchivefile as a string)
然后致电
webview.loadDataWithBaseURL(mywebarchivefile, raw_data, "application/x-webarchive-xml", "UTF-8", null);
参考： http://androidxref.com/4.0.4/xref/external/webkit/Source/WebCore/loader/archive/ArchiveFactory.cpp
适用于Android 3.0，api level 11。