英语: blank　
大词典A大词典B大词典C
[blæŋk]adj.空白的, 茫然的 n.空白, 空白处 vi.消失, 走神 vt.使模糊不清, 删除, 封锁,(比赛时)阻止...得分
例句与用法：
The architect was given/presented with a blank cheque to design a new city centre.
设计师被授予全权设计一个新的城市中心区。
Her explanations were met with blank incomprehension.
大家对她的解释茫然不解。
I can't think where I' my mind's a complete blank!
我想不起来把伞丢在哪儿了，一点印象都没有！
Write your name in the blank.
在空白栏中写上你的名字。
Many blank spaces are still left in the suburbs.
郊区仍留有许多空地。
His memory was completely blank on the subject.
关于这个题目，他已完全丧失记忆。
词形变化：
英英解释:名词 blank:
a blank character used to separate successive words in writing or printing
a substitute for a taboo word
a blank gap or missing part
a piece of material ready to be made into something
a cartridge containing an explosive charge but no bullet
动词 blank:
keep the opposing (baseball) team from winning
形容词 blank:
(of a surface) not written or printed on
void of expression
not charged with a bullet热门点击文章
英雄级，致力于打造最专业的平台，助CFer玩转穿越火线!
蓝蝌蚪旗下网站,Lankdo Network&Technology Co.,Ltd.
闽ICP备号-2&&2014维多利亚的秘密时尚秀
Blank Space(维密秀现场)
韩国毁三观19禁MV合辑
超劲爆无下限无节操MV合辑
爱莉安娜·格兰德
妮琪·米娜* Copyright (C) 2006 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
package android.
import android.net.http.EventH
import android.net.http.RequestH
import android.util.L
import android.webkit.CacheManager.CacheR
import java.util.HashM
import java.util.M
class FrameLoader {
private final LoadListener mL
private final String mM
private final WebSettings mS
private Map mH
private byte[] mPostD
private Network mN
private int mCacheM
private String mR
private String mContentT
private static final int URI_PROTOCOL = 0x100;
private static final String CONTENT_TYPE = "content-type";
// Contents of an about:blank page
private static final String mAboutBlank =
"about:blank";
static final String HEADER_STR = "text/xml, text/html, " +
"application/xhtml+xml, image/png, text/plain, */*;q=0.8";
private static final String LOGTAG = "webkit";
FrameLoader(LoadListener listener, WebSettings settings,
String method) {
mListener =
mHeaders =
mCacheMode = WebSettings.LOAD_NORMAL;
mSettings =
public void setReferrer(String ref) {
// only set referrer for http or https
if (URLUtil.isNetworkUrl(ref)) mReferrer =
public void setPostData(byte[] postData) {
mPostData = postD
public void setContentTypeForPost(String postContentType) {
mContentType = postContentT
public void setCacheMode(int cacheMode) {
mCacheMode = cacheM
public void setHeaders(HashMap headers) {
mHeaders =
public LoadListener getLoadListener() {
* Issues the load request.
* Return value does not indicate if the load was successful or not. It
* simply indicates that the load request is reasonable.
* @return true if the load is reasonable.
public boolean executeLoad() {
String url = mListener.url();
if (URLUtil.isNetworkUrl(url)){
if (mSettings.getBlockNetworkLoads()) {
mListener.error(EventHandler.ERROR_BAD_URL,
mListener.getContext().getString(
com.android.internal.R.string.httpErrorBadUrl));
// Make sure the host part of the url is correctly
// encoded before sending the request
if (!URLUtil.verifyURLEncoding(mListener.host())) {
mListener.error(EventHandler.ERROR_BAD_URL,
mListener.getContext().getString(
com.android.internal.R.string.httpErrorBadUrl));
mNetwork = Network.getInstance(mListener.getContext());
if (mListener.isSynchronous()) {
return handleHTTPLoad();
WebViewWorker.getHandler().obtainMessage(
WebViewWorker.MSG_ADD_HTTPLOADER, this).sendToTarget();
} else if (handleLocalFile(url, mListener, mSettings)) {
if (DebugFlags.FRAME_LOADER) {
Log.v(LOGTAG, "FrameLoader.executeLoad: url protocol not supported:"
+ mListener.url());
mListener.error(EventHandler.ERROR_UNSUPPORTED_SCHEME,
mListener.getContext().getText(
com.android.internal.R.string.httpErrorUnsupportedScheme).toString());
/* package */
static boolean handleLocalFile(String url, LoadListener loadListener,
WebSettings settings) {
// Attempt to decode the percent-encoded url before passing to the
// local loaders.
url = new String(URLUtil.decode(url.getBytes()));
} catch (IllegalArgumentException e) {
loadListener.error(EventHandler.ERROR_BAD_URL,
loadListener.getContext().getString(
com.android.internal.R.string.httpErrorBadUrl));
// Return true here so we do not trigger an unsupported scheme
if (URLUtil.isAssetUrl(url)) {
if (loadListener.isSynchronous()) {
new FileLoader(url, loadListener, FileLoader.TYPE_ASSET,
true).load();
// load asset in a separate thread as it involves IO
WebViewWorker.getHandler().obtainMessage(
WebViewWorker.MSG_ADD_STREAMLOADER,
new FileLoader(url, loadListener, FileLoader.TYPE_ASSET,
true)).sendToTarget();
} else if (URLUtil.isResourceUrl(url)) {
if (loadListener.isSynchronous()) {
new FileLoader(url, loadListener, FileLoader.TYPE_RES,
true).load();
// load resource in a separate thread as it involves IO
WebViewWorker.getHandler().obtainMessage(
WebViewWorker.MSG_ADD_STREAMLOADER,
new FileLoader(url, loadListener, FileLoader.TYPE_RES,
true)).sendToTarget();
} else if (URLUtil.isFileUrl(url)) {
if (loadListener.isSynchronous()) {
new FileLoader(url, loadListener, FileLoader.TYPE_FILE,
settings.getAllowFileAccess()).load();
// load file in a separate thread as it involves IO
WebViewWorker.getHandler().obtainMessage(
WebViewWorker.MSG_ADD_STREAMLOADER,
new FileLoader(url, loadListener, FileLoader.TYPE_FILE,
settings.getAllowFileAccess())).sendToTarget();
} else if (URLUtil.isContentUrl(url)) {
// Send the raw url to the ContentLoader because it will do a
// permission check and the url has to match.
if (loadListener.isSynchronous()) {
new ContentLoader(loadListener.url(), loadListener).load();
// load content in a separate thread as it involves IO
WebViewWorker.getHandler().obtainMessage(
WebViewWorker.MSG_ADD_STREAMLOADER,
new ContentLoader(loadListener.url(), loadListener))
.sendToTarget();
} else if (URLUtil.isDataUrl(url)) {
// load data in the current thread to reduce the latency
new DataLoader(url, loadListener).load();
} else if (URLUtil.isAboutUrl(url)) {
loadListener.data(mAboutBlank.getBytes(), mAboutBlank.length());
loadListener.endData();
boolean handleHTTPLoad() {
if (mHeaders == null) {
mHeaders = new HashMap();
populateStaticHeaders();
populateHeaders();
// response was handled by Cache, don't issue HTTP request
if (handleCache()) {
// push the request data down to the LoadListener
// as response from the cache could be a redirect
// and we may need to initiate a network request if the cache
// can't satisfy redirect URL
mListener.setRequestData(mMethod, mHeaders, mPostData);
if (DebugFlags.FRAME_LOADER) {
Log.v(LOGTAG, "FrameLoader: http " + mMethod + " load for: "
+ mListener.url());
boolean ret =
int error = EventHandler.ERROR_UNSUPPORTED_SCHEME;
ret = mNetwork.requestURL(mMethod, mHeaders,
mPostData, mListener);
} catch (android.net.ParseException ex) {
error = EventHandler.ERROR_BAD_URL;
} catch (java.lang.RuntimeException ex) {
/* probably an empty header set by javascript.
the same result as bad URL
error = EventHandler.ERROR_BAD_URL;
if (!ret) {
mListener.error(error, mListener.getContext().getText(
EventHandler.errorStringResources[Math.abs(error)]).toString());
* This function is used by handleCache to
* setup a load from the byte stream in a CacheResult.
private void startCacheLoad(CacheResult result) {
if (DebugFlags.FRAME_LOADER) {
Log.v(LOGTAG, "FrameLoader: loading from cache: "
+ mListener.url());
// Tell the Listener respond with the cache file
CacheLoader cacheLoader =
new CacheLoader(mListener, result);
mListener.setCacheLoader(cacheLoader);
if (mListener.isSynchronous()) {
cacheLoader.load();
// Load the cached file in a separate thread
WebViewWorker.getHandler().obtainMessage(
WebViewWorker.MSG_ADD_STREAMLOADER, cacheLoader).sendToTarget();
* This function is used by the handleHTTPLoad to setup the cache headers
* correctly.
* Returns true if the response was handled from the cache
private boolean handleCache() {
switch (mCacheMode) {
// This mode is normally used for a reload, it instructs the http
// loader to not use the cached content.
case WebSettings.LOAD_NO_CACHE:
// This mode is used when the content should only be loaded from
// the cache. If it is not there, then fail the load. This is used
// to load POST content in a history navigation.
case WebSettings.LOAD_CACHE_ONLY: {
CacheResult result = CacheManager.getCacheFile(mListener.url(),
mListener.postIdentifier(), null);
if (result != null) {
startCacheLoad(result);
// This happens if WebCore was first told that the POST
// response was in the cache, then when we try to use it
// it has gone.
// Generate a file not found error
int err = EventHandler.FILE_NOT_FOUND_ERROR;
mListener.error(err, mListener.getContext().getText(
EventHandler.errorStringResources[Math.abs(err)])
.toString());
// This mode is for when the user is doing a history navigation
// in the browser and should returned cached content regardless
// of it's state. If it is not in the cache, then go to the
// network.
case WebSettings.LOAD_CACHE_ELSE_NETWORK: {
if (DebugFlags.FRAME_LOADER) {
Log.v(LOGTAG, "FrameLoader: checking cache: "
+ mListener.url());
// Get the cache file name for the current URL, passing null for
// the validation headers causes no validation to occur
CacheResult result = CacheManager.getCacheFile(mListener.url(),
mListener.postIdentifier(), null);
if (result != null) {
startCacheLoad(result);
// This is the default case, which is to check to see if the
// content in the cache can be used. If it can be used, then
// use it. If it needs revalidation then the relevant headers
// are added to the request.
case WebSettings.LOAD_NORMAL:
return mListener.checkCache(mHeaders);
}// end of switch
* Add the static headers that don't change with each request.
private void populateStaticHeaders() {
// Accept header should already be there as they are built by WebCore,
// but in the case they are missing, add some.
String accept = mHeaders.get("Accept");
if (accept == null || accept.length() == 0) {
mHeaders.put("Accept", HEADER_STR);
mHeaders.put("Accept-Charset", "utf-8, iso-8859-1, utf-16, *;q=0.7");
String acceptLanguage = mSettings.getAcceptLanguage();
if (acceptLanguage.length() > 0) {
mHeaders.put("Accept-Language", acceptLanguage);
mHeaders.put("User-Agent", mSettings.getUserAgentString());
* Add the content related headers. These headers contain user private data
* and is not used when we are proxying an untrusted request.
private void populateHeaders() {
if (mReferrer != null) mHeaders.put("Referer", mReferrer);
if (mContentType != null) mHeaders.put(CONTENT_TYPE, mContentType);
// if we have an active proxy and have proxy credentials, do pre-emptive
// authentication to avoid an extra round-trip:
if (mNetwork.isValidProxySet()) {
/* The proxy credentials can be set in the Network thread */
synchronized (mNetwork) {
username = mNetwork.getProxyUsername();
password = mNetwork.getProxyPassword();
if (username != null && password != null) {
// we collect credentials ONLY if the proxy scheme is BASIC!!!
String proxyHeader = RequestHandle.authorizationHeader(true);
mHeaders.put(proxyHeader,
"Basic " + puteBasicAuthResponse(
username, password));
// Set cookie header
String cookie = CookieManager.getInstance().getCookie(
mListener.getWebAddress());
if (cookie != null && cookie.length() > 0) {
mHeaders.put("Cookie", cookie);