计算加载黑莓网页的进度

Question

我想显示加载网页的进度。我使用BrowserFieldListener来计算网页的进度。但屏幕上没有显示。我如何计算这一进展的百分比？

类BrowserFieldDemoScreen扩展MainScreen {

public BrowserFieldDemoScreen() 
{ 
    BrowserFieldConfig myBrowserFieldConfig = new BrowserFieldConfig(); 
    myBrowserFieldConfig.setProperty(BrowserFieldConfig 
.NAVIGATION_MODE,BrowserFieldConfig.NAVIGATION_MODE_POINTER); 


    BrowserField browserField = new BrowserField(); 



    browserField.requestContent("http://www.blackberry.com"); 
    browserField.addListener(new BrowserFieldListener() { 

    public void documentAborted(BrowserField browserField, Document document) throws Exception 
    { 
     if ((browserField != null) && (document != null)) 
     { 
      String title = browserField.getDocumentTitle(); 
      String url = document.getBaseURI(); 
      browserField.getErrorHandler().displayContentError(url, "Aborted loading document '" + title + "'"); 
     } 
     super.documentAborted(browserField, document); 
    } 


    public void documentCreated(BrowserField browserField, ScriptEngine scriptEngine, Document document) throws Exception 
    { 
     if ((browserField != null) && (document != null)) 
     { 
      String title = browserField.getDocumentTitle(); 
      String url = document.getBaseURI(); 
      System.out.println("[" + this.getClass().getName() + "] Document '" + title + "' created for URL " + url); 
     } 
     super.documentCreated(browserField, scriptEngine, document); 
    } 

    /** 
    * 
    * @param browserField - The BrowserField to which the document belongs 
     * @param document - The document for which this event belongs. 
    */ 
    public void documentError(BrowserField browserField, Document document) throws Exception 
    { 
     if ((browserField != null) && (document != null)) 
     { 
      String title = browserField.getDocumentTitle(); 
      String url = document.getBaseURI(); 
      browserField.getErrorHandler().displayContentError(url, "Error loading document '" + title + "'"); 
     } 
     super.documentError(browserField, document); 
    } 


    public void documentLoaded(BrowserField browserField, Document document) throws Exception 
    { 
     if ((browserField != null) && (document != null)) 
     { 
      String title = browserField.getDocumentTitle(); 
      System.out.println("[" + this.getClass().getName() + "] Document '" + title + "' loaded"); 
     } 
     super.documentLoaded(browserField, document); 
    } 


    public void documentUnloading(BrowserField browserField, Document document) throws Exception 
    { 
     if ((browserField != null) && (document != null)) 
     { 
      String title = browserField.getDocumentTitle(); 
      System.out.println("[" + this.getClass().getName() + "] Document '" + title + "' unloading"); 
     } 
     super.documentUnloading(browserField, document); 
    } 


    public void downloadProgress(BrowserField browserField, ContentReadEvent event) throws Exception 
    { 
     if ((browserField != null) && (event != null)) 
     { 
      String title = browserField.getDocumentTitle(); 
      double amtComplete = event.getItemsRead()/event.getItemsToRead(); 
      System.out.println("[" + this.getClass().getName() + "] Document '" + title + "' loading " + String.valueOf(amtComplete) + "% complete"); 
     } 
     super.downloadProgress(browserField, event); 
    }}); 


} 

}

Answer 1

来计算当前装入一个BrowserField你应该附加一个BrowserFieldListener您BrowserField网页的百分比。

您特别感兴趣的事件是downloadProgress(BrowserField browserField, ContentReadEvent event)。

这是来自官方黑莓支持论坛的一个很好的教程，它将教你如何做你想做的事：BrowserField Sample Code。