android_webview/java/src/org/chromium/android_webview/AwContentsClientCallbackHelper.java - chromium/src.git - Git at Google

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 package org.chromium.android_webview;

 import android.graphics.Picture;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 import android.os.SystemClock;

 import org.chromium.base.VisibleForTesting;

 import java.util.concurrent.Callable;

 /**
  * This class is responsible for calling certain client callbacks on the UI thread.
  *
  * Most callbacks do no go through here, but get forwarded to AwContentsClient directly. The
  * messages processed here may originate from the IO or UI thread.
  */
 @VisibleForTesting
 public class AwContentsClientCallbackHelper {
     /**
      * Interface to tell CallbackHelper to cancel posted callbacks.
      */
     public static interface CancelCallbackPoller {
         boolean cancelAllCallbacks();
     }

     // TODO(boliu): Consider removing DownloadInfo and LoginRequestInfo by using native
     // MessageLoop to post directly to AwContents.

     private static class DownloadInfo {
         final String mUrl;
         final String mUserAgent;
         final String mContentDisposition;
         final String mMimeType;
         final long mContentLength;

         DownloadInfo(String url,
                      String userAgent,
                      String contentDisposition,
                      String mimeType,
                      long contentLength) {
             mUrl = url;
             mUserAgent = userAgent;
             mContentDisposition = contentDisposition;
             mMimeType = mimeType;
             mContentLength = contentLength;
         }
     }

     private static class LoginRequestInfo {
         final String mRealm;
         final String mAccount;
         final String mArgs;

         LoginRequestInfo(String realm, String account, String args) {
             mRealm = realm;
             mAccount = account;
             mArgs = args;
         }
     }

     private static class OnReceivedErrorInfo {
         final AwContentsClient.AwWebResourceRequest mRequest;
         final AwContentsClient.AwWebResourceError mError;

         OnReceivedErrorInfo(AwContentsClient.AwWebResourceRequest request,
                 AwContentsClient.AwWebResourceError error) {
             mRequest = request;
             mError = error;
         }
     }

     private static class OnReceivedHttpErrorInfo {
         final AwContentsClient.AwWebResourceRequest mRequest;
         final AwWebResourceResponse mResponse;

         OnReceivedHttpErrorInfo(
                 AwContentsClient.AwWebResourceRequest request, AwWebResourceResponse response) {
             mRequest = request;
             mResponse = response;
         }
     }

     private static class DoUpdateVisitedHistoryInfo {
         final String mUrl;
         final boolean mIsReload;

         DoUpdateVisitedHistoryInfo(String url, boolean isReload) {
             mUrl = url;
             mIsReload = isReload;
         }
     }

     private static class OnFormResubmissionInfo {
         final Message mDontResend;
         final Message mResend;

         OnFormResubmissionInfo(Message dontResend, Message resend) {
             mDontResend = dontResend;
             mResend = resend;
         }
     }

     private static final int MSG_ON_LOAD_RESOURCE = 1;
     private static final int MSG_ON_PAGE_STARTED = 2;
     private static final int MSG_ON_DOWNLOAD_START = 3;
     private static final int MSG_ON_RECEIVED_LOGIN_REQUEST = 4;
     private static final int MSG_ON_RECEIVED_ERROR = 5;
     private static final int MSG_ON_NEW_PICTURE = 6;
     private static final int MSG_ON_SCALE_CHANGED_SCALED = 7;
     private static final int MSG_ON_RECEIVED_HTTP_ERROR = 8;
     private static final int MSG_ON_PAGE_FINISHED = 9;
     private static final int MSG_ON_RECEIVED_TITLE = 10;
     private static final int MSG_ON_PROGRESS_CHANGED = 11;
     private static final int MSG_SYNTHESIZE_PAGE_LOADING = 12;
     private static final int MSG_DO_UPDATE_VISITED_HISTORY = 13;
     private static final int MSG_ON_FORM_RESUBMISSION = 14;

     // Minimum period allowed between consecutive onNewPicture calls, to rate-limit the callbacks.
     private static final long ON_NEW_PICTURE_MIN_PERIOD_MILLIS = 500;
     // Timestamp of the most recent onNewPicture callback.
     private long mLastPictureTime = 0;
     // True when a onNewPicture callback is currenly in flight.
     private boolean mHasPendingOnNewPicture = false;

     private final AwContentsClient mContentsClient;

     private final Handler mHandler;

     private CancelCallbackPoller mCancelCallbackPoller;

     private class MyHandler extends Handler {
         private MyHandler(Looper looper) {
             super(looper);
         }

         @Override
         public void handleMessage(Message msg) {
             if (mCancelCallbackPoller != null && mCancelCallbackPoller.cancelAllCallbacks()) {
                 removeCallbacksAndMessages(null);
                 return;
             }

             switch(msg.what) {
                 case MSG_ON_LOAD_RESOURCE: {
                     final String url = (String) msg.obj;
                     mContentsClient.onLoadResource(url);
                     break;
                 }
                 case MSG_ON_PAGE_STARTED: {
                     final String url = (String) msg.obj;
                     mContentsClient.onPageStarted(url);
                     break;
                 }
                 case MSG_ON_DOWNLOAD_START: {
                     DownloadInfo info = (DownloadInfo) msg.obj;
                     mContentsClient.onDownloadStart(info.mUrl, info.mUserAgent,
                             info.mContentDisposition, info.mMimeType, info.mContentLength);
                     break;
                 }
                 case MSG_ON_RECEIVED_LOGIN_REQUEST: {
                     LoginRequestInfo info = (LoginRequestInfo) msg.obj;
                     mContentsClient.onReceivedLoginRequest(info.mRealm, info.mAccount, info.mArgs);
                     break;
                 }
                 case MSG_ON_RECEIVED_ERROR: {
                     OnReceivedErrorInfo info = (OnReceivedErrorInfo) msg.obj;
                     mContentsClient.onReceivedError(info.mRequest, info.mError);
                     break;
                 }
                 case MSG_ON_NEW_PICTURE: {
                     Picture picture = null;
                     try {
                         if (msg.obj != null) picture = (Picture) ((Callable<?>) msg.obj).call();
                     } catch (Exception e) {
                         throw new RuntimeException("Error getting picture", e);
                     }
                     mContentsClient.onNewPicture(picture);
                     mLastPictureTime = SystemClock.uptimeMillis();
                     mHasPendingOnNewPicture = false;
                     break;
                 }
                 case MSG_ON_SCALE_CHANGED_SCALED: {
                     float oldScale = Float.intBitsToFloat(msg.arg1);
                     float newScale = Float.intBitsToFloat(msg.arg2);
                     mContentsClient.onScaleChangedScaled(oldScale, newScale);
                     break;
                 }
                 case MSG_ON_RECEIVED_HTTP_ERROR: {
                     OnReceivedHttpErrorInfo info = (OnReceivedHttpErrorInfo) msg.obj;
                     mContentsClient.onReceivedHttpError(info.mRequest, info.mResponse);
                     break;
                 }
                 case MSG_ON_PAGE_FINISHED: {
                     final String url = (String) msg.obj;
                     mContentsClient.onPageFinished(url);
                     break;
                 }
                 case MSG_ON_RECEIVED_TITLE: {
                     final String title = (String) msg.obj;
                     mContentsClient.onReceivedTitle(title);
                     break;
                 }
                 case MSG_ON_PROGRESS_CHANGED: {
                     mContentsClient.onProgressChanged(msg.arg1);
                     break;
                 }
                 case MSG_SYNTHESIZE_PAGE_LOADING: {
                     final String url = (String) msg.obj;
                     mContentsClient.onPageStarted(url);
                     mContentsClient.onLoadResource(url);
                     mContentsClient.onProgressChanged(100);
                     mContentsClient.onPageFinished(url);
                     break;
                 }
                 case MSG_DO_UPDATE_VISITED_HISTORY: {
                     final DoUpdateVisitedHistoryInfo info = (DoUpdateVisitedHistoryInfo) msg.obj;
                     mContentsClient.doUpdateVisitedHistory(info.mUrl, info.mIsReload);
                     break;
                 }
                 case MSG_ON_FORM_RESUBMISSION: {
                     final OnFormResubmissionInfo info = (OnFormResubmissionInfo) msg.obj;
                     mContentsClient.onFormResubmission(info.mDontResend, info.mResend);
                     break;
                 }
                 default:
                     throw new IllegalStateException(
                             "AwContentsClientCallbackHelper: unhandled message " + msg.what);
             }
         }
     }

     public AwContentsClientCallbackHelper(Looper looper, AwContentsClient contentsClient) {
         mHandler = new MyHandler(looper);
         mContentsClient = contentsClient;
     }

     // Public for tests.
     public void setCancelCallbackPoller(CancelCallbackPoller poller) {
         mCancelCallbackPoller = poller;
     }

     public void postOnLoadResource(String url) {
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_LOAD_RESOURCE, url));
     }

     public void postOnPageStarted(String url) {
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_PAGE_STARTED, url));
     }

     public void postOnDownloadStart(String url, String userAgent, String contentDisposition,
             String mimeType, long contentLength) {
         DownloadInfo info = new DownloadInfo(url, userAgent, contentDisposition, mimeType,
                 contentLength);
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_DOWNLOAD_START, info));
     }

     public void postOnReceivedLoginRequest(String realm, String account, String args) {
         LoginRequestInfo info = new LoginRequestInfo(realm, account, args);
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_RECEIVED_LOGIN_REQUEST, info));
     }

     public void postOnReceivedError(AwContentsClient.AwWebResourceRequest request,
             AwContentsClient.AwWebResourceError error) {
         OnReceivedErrorInfo info = new OnReceivedErrorInfo(request, error);
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_RECEIVED_ERROR, info));
     }

     public void postOnNewPicture(Callable<Picture> pictureProvider) {
         if (mHasPendingOnNewPicture) return;
         mHasPendingOnNewPicture = true;
         long pictureTime = java.lang.Math.max(mLastPictureTime + ON_NEW_PICTURE_MIN_PERIOD_MILLIS,
                 SystemClock.uptimeMillis());
         mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ON_NEW_PICTURE, pictureProvider),
                 pictureTime);
     }

     public void postOnScaleChangedScaled(float oldScale, float newScale) {
         // The float->int->float conversion here is to avoid unnecessary allocations. The
         // documentation states that intBitsToFloat(floatToIntBits(a)) == a for all values of a
         // (except for NaNs which are collapsed to a single canonical NaN, but we don't care for
         // that case).
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_SCALE_CHANGED_SCALED,
                     Float.floatToIntBits(oldScale), Float.floatToIntBits(newScale)));
     }

     public void postOnReceivedHttpError(AwContentsClient.AwWebResourceRequest request,
             AwWebResourceResponse response) {
         OnReceivedHttpErrorInfo info =
                 new OnReceivedHttpErrorInfo(request, response);
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_RECEIVED_HTTP_ERROR, info));
     }

     public void postOnPageFinished(String url) {
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_PAGE_FINISHED, url));
     }

     public void postOnReceivedTitle(String title) {
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_RECEIVED_TITLE, title));
     }

     public void postOnProgressChanged(int progress) {
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_PROGRESS_CHANGED, progress, 0));
     }

     public void postSynthesizedPageLoadingForUrlBarUpdate(String url) {
         mHandler.sendMessage(mHandler.obtainMessage(MSG_SYNTHESIZE_PAGE_LOADING, url));
     }

     public void postDoUpdateVisitedHistory(String url, boolean isReload) {
         DoUpdateVisitedHistoryInfo info = new DoUpdateVisitedHistoryInfo(url, isReload);
         mHandler.sendMessage(mHandler.obtainMessage(MSG_DO_UPDATE_VISITED_HISTORY, info));
     }

     public void postOnFormResubmission(Message dontResend, Message resend) {
         OnFormResubmissionInfo info = new OnFormResubmissionInfo(dontResend, resend);
         mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_FORM_RESUBMISSION, info));
     }

     void removeCallbacksAndMessages() {
         mHandler.removeCallbacksAndMessages(null);
     }
 }
	// Copyright 2013 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	package org.chromium.android_webview;

	import android.graphics.Picture;
	import android.os.Handler;
	import android.os.Looper;
	import android.os.Message;
	import android.os.SystemClock;

	import org.chromium.base.VisibleForTesting;

	import java.util.concurrent.Callable;

	/**
	* This class is responsible for calling certain client callbacks on the UI thread.
	*
	* Most callbacks do no go through here, but get forwarded to AwContentsClient directly. The
	* messages processed here may originate from the IO or UI thread.
	*/
	@VisibleForTesting
	public class AwContentsClientCallbackHelper {
	/**
	* Interface to tell CallbackHelper to cancel posted callbacks.
	*/
	public static interface CancelCallbackPoller {
	boolean cancelAllCallbacks();
	}

	// TODO(boliu): Consider removing DownloadInfo and LoginRequestInfo by using native
	// MessageLoop to post directly to AwContents.

	private static class DownloadInfo {
	final String mUrl;
	final String mUserAgent;
	final String mContentDisposition;
	final String mMimeType;
	final long mContentLength;

	DownloadInfo(String url,
	String userAgent,
	String contentDisposition,
	String mimeType,
	long contentLength) {
	mUrl = url;
	mUserAgent = userAgent;
	mContentDisposition = contentDisposition;
	mMimeType = mimeType;
	mContentLength = contentLength;
	}
	}

	private static class LoginRequestInfo {
	final String mRealm;
	final String mAccount;
	final String mArgs;

	LoginRequestInfo(String realm, String account, String args) {
	mRealm = realm;
	mAccount = account;
	mArgs = args;
	}
	}

	private static class OnReceivedErrorInfo {
	final AwContentsClient.AwWebResourceRequest mRequest;
	final AwContentsClient.AwWebResourceError mError;

	OnReceivedErrorInfo(AwContentsClient.AwWebResourceRequest request,
	AwContentsClient.AwWebResourceError error) {
	mRequest = request;
	mError = error;
	}
	}

	private static class OnReceivedHttpErrorInfo {
	final AwContentsClient.AwWebResourceRequest mRequest;
	final AwWebResourceResponse mResponse;

	OnReceivedHttpErrorInfo(
	AwContentsClient.AwWebResourceRequest request, AwWebResourceResponse response) {
	mRequest = request;
	mResponse = response;
	}
	}

	private static class DoUpdateVisitedHistoryInfo {
	final String mUrl;
	final boolean mIsReload;

	DoUpdateVisitedHistoryInfo(String url, boolean isReload) {
	mUrl = url;
	mIsReload = isReload;
	}
	}

	private static class OnFormResubmissionInfo {
	final Message mDontResend;
	final Message mResend;

	OnFormResubmissionInfo(Message dontResend, Message resend) {
	mDontResend = dontResend;
	mResend = resend;
	}
	}

	private static final int MSG_ON_LOAD_RESOURCE = 1;
	private static final int MSG_ON_PAGE_STARTED = 2;
	private static final int MSG_ON_DOWNLOAD_START = 3;
	private static final int MSG_ON_RECEIVED_LOGIN_REQUEST = 4;
	private static final int MSG_ON_RECEIVED_ERROR = 5;
	private static final int MSG_ON_NEW_PICTURE = 6;
	private static final int MSG_ON_SCALE_CHANGED_SCALED = 7;
	private static final int MSG_ON_RECEIVED_HTTP_ERROR = 8;
	private static final int MSG_ON_PAGE_FINISHED = 9;
	private static final int MSG_ON_RECEIVED_TITLE = 10;
	private static final int MSG_ON_PROGRESS_CHANGED = 11;
	private static final int MSG_SYNTHESIZE_PAGE_LOADING = 12;
	private static final int MSG_DO_UPDATE_VISITED_HISTORY = 13;
	private static final int MSG_ON_FORM_RESUBMISSION = 14;

	// Minimum period allowed between consecutive onNewPicture calls, to rate-limit the callbacks.
	private static final long ON_NEW_PICTURE_MIN_PERIOD_MILLIS = 500;
	// Timestamp of the most recent onNewPicture callback.
	private long mLastPictureTime = 0;
	// True when a onNewPicture callback is currenly in flight.
	private boolean mHasPendingOnNewPicture = false;

	private final AwContentsClient mContentsClient;

	private final Handler mHandler;

	private CancelCallbackPoller mCancelCallbackPoller;

	private class MyHandler extends Handler {
	private MyHandler(Looper looper) {
	super(looper);
	}

	@Override
	public void handleMessage(Message msg) {
	if (mCancelCallbackPoller != null && mCancelCallbackPoller.cancelAllCallbacks()) {
	removeCallbacksAndMessages(null);
	return;
	}

	switch(msg.what) {
	case MSG_ON_LOAD_RESOURCE: {
	final String url = (String) msg.obj;
	mContentsClient.onLoadResource(url);
	break;
	}
	case MSG_ON_PAGE_STARTED: {
	final String url = (String) msg.obj;
	mContentsClient.onPageStarted(url);
	break;
	}
	case MSG_ON_DOWNLOAD_START: {
	DownloadInfo info = (DownloadInfo) msg.obj;
	mContentsClient.onDownloadStart(info.mUrl, info.mUserAgent,
	info.mContentDisposition, info.mMimeType, info.mContentLength);
	break;
	}
	case MSG_ON_RECEIVED_LOGIN_REQUEST: {
	LoginRequestInfo info = (LoginRequestInfo) msg.obj;
	mContentsClient.onReceivedLoginRequest(info.mRealm, info.mAccount, info.mArgs);
	break;
	}
	case MSG_ON_RECEIVED_ERROR: {
	OnReceivedErrorInfo info = (OnReceivedErrorInfo) msg.obj;
	mContentsClient.onReceivedError(info.mRequest, info.mError);
	break;
	}
	case MSG_ON_NEW_PICTURE: {
	Picture picture = null;
	try {
	if (msg.obj != null) picture = (Picture) ((Callable<?>) msg.obj).call();
	} catch (Exception e) {
	throw new RuntimeException("Error getting picture", e);
	}
	mContentsClient.onNewPicture(picture);
	mLastPictureTime = SystemClock.uptimeMillis();
	mHasPendingOnNewPicture = false;
	break;
	}
	case MSG_ON_SCALE_CHANGED_SCALED: {
	float oldScale = Float.intBitsToFloat(msg.arg1);
	float newScale = Float.intBitsToFloat(msg.arg2);
	mContentsClient.onScaleChangedScaled(oldScale, newScale);
	break;
	}
	case MSG_ON_RECEIVED_HTTP_ERROR: {
	OnReceivedHttpErrorInfo info = (OnReceivedHttpErrorInfo) msg.obj;
	mContentsClient.onReceivedHttpError(info.mRequest, info.mResponse);
	break;
	}
	case MSG_ON_PAGE_FINISHED: {
	final String url = (String) msg.obj;
	mContentsClient.onPageFinished(url);
	break;
	}
	case MSG_ON_RECEIVED_TITLE: {
	final String title = (String) msg.obj;
	mContentsClient.onReceivedTitle(title);
	break;
	}
	case MSG_ON_PROGRESS_CHANGED: {
	mContentsClient.onProgressChanged(msg.arg1);
	break;
	}
	case MSG_SYNTHESIZE_PAGE_LOADING: {
	final String url = (String) msg.obj;
	mContentsClient.onPageStarted(url);
	mContentsClient.onLoadResource(url);
	mContentsClient.onProgressChanged(100);
	mContentsClient.onPageFinished(url);
	break;
	}
	case MSG_DO_UPDATE_VISITED_HISTORY: {
	final DoUpdateVisitedHistoryInfo info = (DoUpdateVisitedHistoryInfo) msg.obj;
	mContentsClient.doUpdateVisitedHistory(info.mUrl, info.mIsReload);
	break;
	}
	case MSG_ON_FORM_RESUBMISSION: {
	final OnFormResubmissionInfo info = (OnFormResubmissionInfo) msg.obj;
	mContentsClient.onFormResubmission(info.mDontResend, info.mResend);
	break;
	}
	default:
	throw new IllegalStateException(
	"AwContentsClientCallbackHelper: unhandled message " + msg.what);
	}
	}
	}

	public AwContentsClientCallbackHelper(Looper looper, AwContentsClient contentsClient) {
	mHandler = new MyHandler(looper);
	mContentsClient = contentsClient;
	}

	// Public for tests.
	public void setCancelCallbackPoller(CancelCallbackPoller poller) {
	mCancelCallbackPoller = poller;
	}

	public void postOnLoadResource(String url) {
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_LOAD_RESOURCE, url));
	}

	public void postOnPageStarted(String url) {
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_PAGE_STARTED, url));
	}

	public void postOnDownloadStart(String url, String userAgent, String contentDisposition,
	String mimeType, long contentLength) {
	DownloadInfo info = new DownloadInfo(url, userAgent, contentDisposition, mimeType,
	contentLength);
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_DOWNLOAD_START, info));
	}

	public void postOnReceivedLoginRequest(String realm, String account, String args) {
	LoginRequestInfo info = new LoginRequestInfo(realm, account, args);
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_RECEIVED_LOGIN_REQUEST, info));
	}

	public void postOnReceivedError(AwContentsClient.AwWebResourceRequest request,
	AwContentsClient.AwWebResourceError error) {
	OnReceivedErrorInfo info = new OnReceivedErrorInfo(request, error);
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_RECEIVED_ERROR, info));
	}

	public void postOnNewPicture(Callable<Picture> pictureProvider) {
	if (mHasPendingOnNewPicture) return;
	mHasPendingOnNewPicture = true;
	long pictureTime = java.lang.Math.max(mLastPictureTime + ON_NEW_PICTURE_MIN_PERIOD_MILLIS,
	SystemClock.uptimeMillis());
	mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ON_NEW_PICTURE, pictureProvider),
	pictureTime);
	}

	public void postOnScaleChangedScaled(float oldScale, float newScale) {
	// The float->int->float conversion here is to avoid unnecessary allocations. The
	// documentation states that intBitsToFloat(floatToIntBits(a)) == a for all values of a
	// (except for NaNs which are collapsed to a single canonical NaN, but we don't care for
	// that case).
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_SCALE_CHANGED_SCALED,
	Float.floatToIntBits(oldScale), Float.floatToIntBits(newScale)));
	}

	public void postOnReceivedHttpError(AwContentsClient.AwWebResourceRequest request,
	AwWebResourceResponse response) {
	OnReceivedHttpErrorInfo info =
	new OnReceivedHttpErrorInfo(request, response);
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_RECEIVED_HTTP_ERROR, info));
	}

	public void postOnPageFinished(String url) {
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_PAGE_FINISHED, url));
	}

	public void postOnReceivedTitle(String title) {
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_RECEIVED_TITLE, title));
	}

	public void postOnProgressChanged(int progress) {
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_PROGRESS_CHANGED, progress, 0));
	}

	public void postSynthesizedPageLoadingForUrlBarUpdate(String url) {
	mHandler.sendMessage(mHandler.obtainMessage(MSG_SYNTHESIZE_PAGE_LOADING, url));
	}

	public void postDoUpdateVisitedHistory(String url, boolean isReload) {
	DoUpdateVisitedHistoryInfo info = new DoUpdateVisitedHistoryInfo(url, isReload);
	mHandler.sendMessage(mHandler.obtainMessage(MSG_DO_UPDATE_VISITED_HISTORY, info));
	}

	public void postOnFormResubmission(Message dontResend, Message resend) {
	OnFormResubmissionInfo info = new OnFormResubmissionInfo(dontResend, resend);
	mHandler.sendMessage(mHandler.obtainMessage(MSG_ON_FORM_RESUBMISSION, info));
	}

	void removeCallbacksAndMessages() {
	mHandler.removeCallbacksAndMessages(null);
	}
	}