我正在使用浏览器字段，它将在模拟器4.7风暴中显示。但是当我在设备上执行时，它仍然是空白的，并且页面没有显示。任何人都可以提供帮助。
答案 0 :(得分：0)
这是代码，我尝试将“; interface = true”附加到url仍然不在9550设备上执行，而在9550模拟器中执行
/ * * BrowserFieldDemo.java * *版权所有©1998-2009 Research In Motion Ltd. * *注意：为简单起见，此示例应用程序可能无法利用 *资源包和资源字符串。但是，强烈推荐 *应用程序开发人员使用可用的本地化功能 *在BlackBerry开发平台内确保无缝应用 *跨越各种语言和地理区域的经验。欲获得更多信息 *有关本地化您的应用程序的信息，请参阅BlackBerry Java Development *与此版本相关的环境开发指南。 * /
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。*;
final类BrowserFieldDemo扩展UiApplication实现RenderingApplication {
private static final String REFERER = "referer";
private RenderingSession _renderingSession;
private HttpConnection _currentConnection;
private MainScreen _mainScreen;
/***************************************************************************
* Main.
**************************************************************************/
public static void main(String[] args)
{
BrowserFieldDemo app = new BrowserFieldDemo();
app.enterEventDispatcher();
}
private 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://wwww.vensi.com"+";interface=true", null, null, null, this);
thread.start();
}
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)
{
}
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();
}
}
class PrimaryResourceFetchThread扩展Thread {
private BrowserFieldDemo _application;
private Event _event;
private byte[] _postData;
private HttpHeaders _requestHeaders;
private String _url;
PrimaryResourceFetchThread(String url, HttpHeaders requestHeaders, byte[] postData,
Event event, BrowserFieldDemo application)
{
_url = url;
_requestHeaders = requestHeaders;
_postData = postData;
_application = application;
_event = event;
}
public void run()
{
HttpConnection connection = Utilities.makeConnection(_url, _requestHeaders, _postData);
_application.processConnection(connection, _event);
}
}
答案 1 :(得分：-1)
示例中存在一个错误，BB人员多年来一直没有做任何事情。您永远不会知道您的页面没有呈现，您将被重定向到所有调用页面。当他们无法呈现页面时，他们在HTTP响应中插入重定向代码，而不是给出渲染异常（在输入流中检查它并将其转换为字符串，你应该知道），并且从不显示目标页面。他们使用BrowserField在5.0及更高版本中解决了这个问题，但我们需要针对低端手机的解决方案。