【发布时间】：2010-09-29 21:45:43
【问题描述】：
在您的黑莓应用程序中是否有任何用于查看 html 内容的 api？需要明确的是，我并不是指在我的应用程序顶部启动浏览器来查看页面。而是在我的应用中呈现页面。
【问题讨论】：
标签： html user-interface blackberry java-me custom-controls
【发布时间】：2010-09-29 21:45:43
【问题描述】：
是的。查看 net.rim.device.api.browser.field 包或应用程序集成的 Blackberry Browser 部分。
一切都在这里结束：
Field field = browserContent.getDisplayableContent();
见：
JDE 4.0.0 API for the package
RIM app integration guide
像往常一样仅签名的 api。
【讨论】：
-
上面的第一个链接好像坏了 - 试试这个链接：blackberry.com/developers/docs/4.5.0api/net/rim/device/api/…
-
这里有一些相关的黑莓示例代码：docs.blackberry.com/en/developers/deliverables/11935/…
-
@Dan J，你的最后一个链接失效了。
-
这里有一些示例代码的链接（我希望 RIM 停止破坏他们的旧链接！）：blackberry.com/developers/docs/4.7.0api/…
//BrowserField is available for 4.5 OS. RIM provide sample app for BrowserField Demo. you can find the sample example and run it.
/*
* BrowserFieldDemo.java
*
* Copyright © 1998-2010 Research In Motion Ltd.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.blackberry.browser;
import java.io.IOException;
import javax.microedition.io.HttpConnection;
import net.rim.device.api.browser.field.*;
import net.rim.device.api.io.http.HttpHeaders;
import net.rim.device.api.system.Application;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.Status;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.system.*;
/**
* This sample application demonstrates how to create a web browser using the
* net.rim.device.api.browser.field package.
*/
public final class BrowserFieldDemo extends UiApplication implements RenderingApplication
{
private static String REFERER = "referer";
private RenderingSession _renderingSession;
private HttpConnection _currentConnection;
private MainScreen _mainScreen;
/**
* Entry point for application
* @param args Command line arguments (not used)
*/
public static void main(String[] args)
{
BrowserFieldDemo app = new BrowserFieldDemo();
// Make the currently running thread the application's event
// dispatch thread and begin processing events.
app.enterEventDispatcher();
}
// Constructor
public BrowserFieldDemo()
{
_mainScreen = new MainScreen();
pushScreen(_mainScreen);
_renderingSession = RenderingSession.getNewInstance();
// Enable javascript
//_renderingSession.getRenderingOptions().setProperty(RenderingOptions.CORE_OPTIONS_GUID, RenderingOptions.JAVASCRIPT_ENABLED, true);
PrimaryResourceFetchThread thread = new PrimaryResourceFetchThread("http://www.google.com", null, null, null, this);
thread.start();
}
/**
* Processes an http connection
*
* @param connection The connection to the web content
* @param e The event triggering the connection
*/
void processConnection(HttpConnection connection, Event e)
{
// Cancel previous request
if (_currentConnection != null)
{
try
{
_currentConnection.close();
}
catch (IOException e1)
{
}
}
_currentConnection = connection;
BrowserContent browserContent = null;
try
{
browserContent = _renderingSession.getBrowserContent(connection, this, e);
if (browserContent != null)
{
Field field = browserContent.getDisplayableContent();
if (field != null)
{
synchronized (Application.getEventLock())
{
_mainScreen.deleteAll();
_mainScreen.add(field);
}
}
browserContent.finishLoading();
}
}
catch (RenderingException re)
{
Utilities.errorDialog("RenderingSession#getBrowserContent() threw " + re.toString());
}
finally
{
SecondaryResourceFetchThread.doneAddingImages();
}
}
/**
* @see net.rim.device.api.browser.RenderingApplication#eventOccurred(net.rim.device.api.browser.Event)
*/
public Object eventOccurred(Event event)
{
int eventId = event.getUID();
switch (eventId)
{
case Event.EVENT_URL_REQUESTED :
{
UrlRequestedEvent urlRequestedEvent = (UrlRequestedEvent) event;
PrimaryResourceFetchThread thread = new PrimaryResourceFetchThread(urlRequestedEvent.getURL(),
urlRequestedEvent.getHeaders(),
urlRequestedEvent.getPostData(),
event, this);
thread.start();
break;
}
case Event.EVENT_BROWSER_CONTENT_CHANGED:
{
// Browser field title might have changed update title.
BrowserContentChangedEvent browserContentChangedEvent = (BrowserContentChangedEvent) event;
if (browserContentChangedEvent.getSource() instanceof BrowserContent)
{
BrowserContent browserField = (BrowserContent) browserContentChangedEvent.getSource();
String newTitle = browserField.getTitle();
if (newTitle != null)
{
synchronized (getAppEventLock())
{
_mainScreen.setTitle(newTitle);
}
}
}
break;
}
case Event.EVENT_REDIRECT :
{
RedirectEvent e = (RedirectEvent) event;
String referrer = e.getSourceURL();
switch (e.getType())
{
case RedirectEvent.TYPE_SINGLE_FRAME_REDIRECT :
// Show redirect message.
Application.getApplication().invokeAndWait(new Runnable()
{
public void run()
{
Status.show("You are being redirected to a different page...");
}
});
break;
case RedirectEvent.TYPE_JAVASCRIPT :
break;
case RedirectEvent.TYPE_META :
// MSIE and Mozilla don't send a Referer for META Refresh.
referrer = null;
break;
case RedirectEvent.TYPE_300_REDIRECT :
// MSIE, Mozilla, and Opera all send the original
// request's Referer as the Referer for the new
// request.
Object eventSource = e.getSource();
if (eventSource instanceof HttpConnection)
{
referrer = ((HttpConnection)eventSource).getRequestProperty(REFERER);
}
break;
}
HttpHeaders requestHeaders = new HttpHeaders();
requestHeaders.setProperty(REFERER, referrer);
PrimaryResourceFetchThread thread = new PrimaryResourceFetchThread(e.getLocation(), requestHeaders,null, event, this);
thread.start();
break;
}
case Event.EVENT_CLOSE :
// TODO: close the appication
break;
case Event.EVENT_SET_HEADER : // No cache support.
case Event.EVENT_SET_HTTP_COOKIE : // No cookie support.
case Event.EVENT_HISTORY : // No history support.
case Event.EVENT_EXECUTING_SCRIPT : // No progress bar is supported.
case Event.EVENT_FULL_WINDOW : // No full window support.
case Event.EVENT_STOP : // No stop loading support.
default :
}
return null;
}
/**
* @see net.rim.device.api.browser.RenderingApplication#getAvailableHeight(net.rim.device.api.browser.BrowserContent)
*/
public int getAvailableHeight(BrowserContent browserField)
{
// Field has full screen.
return Display.getHeight();
}
/**
* @see net.rim.device.api.browser.RenderingApplication#getAvailableWidth(net.rim.device.api.browser.BrowserContent)
*/
public int getAvailableWidth(BrowserContent browserField)
{
// Field has full screen.
return Display.getWidth();
}
/**
* @see net.rim.device.api.browser.RenderingApplication#getHistoryPosition(net.rim.device.api.browser.BrowserContent)
*/
public int getHistoryPosition(BrowserContent browserField)
{
// No history support.
return 0;
}
/**
* @see net.rim.device.api.browser.RenderingApplication#getHTTPCookie(java.lang.String)
*/
public String getHTTPCookie(String url)
{
// No cookie support.
return null;
}
/**
* @see net.rim.device.api.browser.RenderingApplication#getResource(net.rim.device.api.browser.RequestedResource,
* net.rim.device.api.browser.BrowserContent)
*/
public HttpConnection getResource( RequestedResource resource, BrowserContent referrer)
{
if (resource == null)
{
return null;
}
// Check if this is cache-only request.
if (resource.isCacheOnly())
{
// No cache support.
return null;
}
String url = resource.getUrl();
if (url == null)
{
return null;
}
// If referrer is null we must return the connection.
if (referrer == null)
{
HttpConnection connection = Utilities.makeConnection(resource.getUrl(), resource.getRequestHeaders(), null);
return connection;
}
else
{
// If referrer is provided we can set up the connection on a separate thread.
SecondaryResourceFetchThread.enqueue(resource, referrer);
}
return null;
}
/**
* @see net.rim.device.api.browser.RenderingApplication#invokeRunnable(java.lang.Runnable)
*/
public void invokeRunnable(Runnable runnable)
{
(new Thread(runnable)).start();
}
}
/**
* A Thread class to fetch content using an http connection
*/
final class PrimaryResourceFetchThread extends Thread
{
private BrowserFieldDemo _application;
private Event _event;
private byte[] _postData;
private HttpHeaders _requestHeaders;
private String _url;
/**
* Constructor to create a PrimaryResourceFetchThread which fetches the web
* resource from the specified url.
*
* @param url The url to fetch the content from
* @param requestHeaders The http request headers used to fetch the content
* @param postData Data which is to be posted to the url
* @param event The event triggering the connection
* @param application The application requesting the connection
*/
PrimaryResourceFetchThread(String url, HttpHeaders requestHeaders, byte[] postData, Event event, BrowserFieldDemo application)
{
_url = url;
_requestHeaders = requestHeaders;
_postData = postData;
_application = application;
_event = event;
}
/**
* Connects to the url associated with this object
*
* @see java.lang.Thread#run()
*/
public void run()
{
HttpConnection connection = Utilities.makeConnection(_url, _requestHeaders, _postData);
_application.processConnection(connection, _event);
}
}
/////////////////////////////////////////////////////////////////
/*
* SecondaryResourceFetchThread.java
*
* Copyright © 1998-2010 Research In Motion Ltd.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.blackberry.browser;
import java.util.Vector;
import javax.microedition.io.HttpConnection;
import net.rim.device.api.browser.field.BrowserContent;
import net.rim.device.api.browser.field.RequestedResource;
/**
* This class provides the ability to set up an http connection if a referrer
* exists (a browser making the request).
*/
class SecondaryResourceFetchThread extends Thread
{
/**
* Callback browser field.
*/
private BrowserContent _browserField;
/**
* Images to retrieve.
*/
private Vector _imageQueue;
/**
* True is all images have been enqueued.
*/
private boolean _done;
/**
* Sync object.
*/
private static Object _syncObject = new Object();
/**
* Secondary thread.
*/
private static SecondaryResourceFetchThread _currentThread;
/**
* Enqueues secondary resource for a browser field.
*
* @param resource - resource to retrieve.
* @param referrer - call back browsr field.
*/
static void enqueue(RequestedResource resource, BrowserContent referrer)
{
if (resource == null)
{
return;
}
synchronized( _syncObject )
{
// Create new thread.
if (_currentThread == null)
{
_currentThread = new SecondaryResourceFetchThread();
_currentThread.start();
}
else
{
// If thread alread is running, check that we are adding images for the same browser field.
if (referrer != _currentThread._browserField)
{
synchronized( _currentThread._imageQueue)
{
// If the request is for a different browser field,
// clear old elements.
_currentThread._imageQueue.removeAllElements();
}
}
}
synchronized( _currentThread._imageQueue)
{
_currentThread._imageQueue.addElement(resource);
}
_currentThread._browserField = referrer;
}
}
/**
* Constructor
*
*/
private SecondaryResourceFetchThread()
{
_imageQueue = new Vector();
}
/**
* Indicate that all images have been enqueued for this browser field.
*/
static void doneAddingImages()
{
synchronized( _syncObject )
{
if (_currentThread != null)
{
_currentThread._done = true;
}
}
}
/**
* Connects to the requested resource
*
* @see java.lang.Runnable#run()
*/
public void run()
{
while (true)
{
if (_done)
{
// Check if we are done requesting images.
synchronized( _syncObject )
{
synchronized( _imageQueue )
{
if (_imageQueue.size() == 0)
{
_currentThread = null;
break;
}
}
}
}
RequestedResource resource = null;
// Request next image.
synchronized( _imageQueue )
{
if (_imageQueue.size() > 0)
{
resource = (RequestedResource)_imageQueue.elementAt(0);
_imageQueue.removeElementAt(0);
}
}
if (resource != null)
{
HttpConnection connection = Utilities.makeConnection(resource.getUrl(), resource.getRequestHeaders(), null);
resource.setHttpConnection(connection);
// Signal to the browser field that resource is ready.
if (_browserField != null)
{
_browserField.resourceReady(resource);
}
}
}
}
}
///////////////////////////////////////////////////////////////////
/*
* Utilities.java
*
* Copyright © 1998-2010 Research In Motion Ltd.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.blackberry.browser;
import java.io.IOException;
import java.io.OutputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import net.rim.device.api.io.http.HttpHeaders;
import net.rim.device.api.io.http.HttpProtocolConstants;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.util.StringUtilities;
/**
* This class provides common functions required by the
* BrowserContentManagerDemo and BrowserFieldDemo. This class allows the
* aforementioned classes to make a connection to a specified url.
*/
class Utilities
{
/**
* Connect to a web resource
* @param url The url of the resource
* @param requestHeaders The request headers describing the connection to be made
* @param postData The data to post to the web resource
* @return The HttpConnection object representing the connection to the resource, null if no connection could be made
*/
static HttpConnection makeConnection(String url, HttpHeaders requestHeaders, byte[] postData)
{
HttpConnection conn = null;
OutputStream out = null;
try
{
conn = (HttpConnection) Connector.open(url);
if (requestHeaders != null)
{
// From
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec15.html#sec15.1.3
//
// Clients SHOULD NOT include a Referer header field in a (non-secure) HTTP
// request if the referring page was transferred with a secure protocol.
String referer = requestHeaders.getPropertyValue("referer");
boolean sendReferrer = true;
if (referer != null && StringUtilities.startsWithIgnoreCase(referer, "https:") && !StringUtilities.startsWithIgnoreCase(url, "https:"))
{
sendReferrer = false;
}
int size = requestHeaders.size();
for (int i = 0; i < size;)
{
String header = requestHeaders.getPropertyKey(i);
// Remove referer header if needed.
if ( !sendReferrer && header.equals("referer"))
{
requestHeaders.removeProperty(i);
--size;
continue;
}
String value = requestHeaders.getPropertyValue( i++ );
if (value != null)
{
conn.setRequestProperty( header, value);
}
}
}
if (postData == null)
{
conn.setRequestMethod(HttpConnection.GET);
}
else
{
conn.setRequestMethod(HttpConnection.POST);
conn.setRequestProperty(HttpProtocolConstants.HEADER_CONTENT_LENGTH, String.valueOf(postData.length));
out = conn.openOutputStream();
out.write(postData);
}
}
catch (IOException e1)
{
errorDialog(e1.toString());
}
finally
{
if (out != null)
{
try
{
out.close();
}
catch (IOException e2)
{
errorDialog("OutputStream#close() threw " + e2.toString());
}
}
}
return conn;
}
/**
* Presents a dialog to the user with a given message
* @param message The text to display
*/
public static void errorDialog(final String message)
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
Dialog.alert(message);
}
});
}
}
【讨论】：