一针见血

• 开发伙伴平台：

S60 3rd Edition

• 详细描述

S60应用程序在前台时，可以设置导航条显示自定义图标或文本。

首先，我们要获得一个状态栏的引用。然后可以从中获得导航栏的引用。应用程序可以使用CAknNavigationDecorator类生成一个基于文本的Navi decorator对象。最后这个对象需要添加到导航栏中以便开始显示：

//------------------------------------------------------------------------------
 
CAknNavigationControlContainer* iNaviPane = 0;
 
CAknNavigationDecorator* iNaviDecorator = 0;
 
//Get the reference of the status pane
 
CEikStatusPane *statusPane = iEikonEnv->AppUiFactory()->StatusPane();
 
if ( statusPane )
 
{
 
//Get the reference of the navi pane
 
iNaviPane=static_cast<CAknNavigationControlContainer*>(statusPane->ControlL(
 
TUid::Uid(EEikStatusPaneUidNavi)) );
 
//Create a Navi decorator object
 
iNaviDecorator= iNaviPane->CreateEditorIndicatorContainerL();
 
//Get the reference of the indicator container inside the NaviDecorator
 
CAknIndicatorContainer* indiContainer =
 
static_cast<CAknIndicatorContainer*>(iNaviDecorator->DecoratedControl());
 
if ( indiContainer && CEikStatusPaneBase::Current() )
 
{
 
TBuf<32> msgSize;
 
msgSize.Append(_L("Test")); // Text to be displayed
 
 
indiContainer->SetIndicatorValueL(
 
TUid::Uid( EAknNaviPaneEditorIndicatorMessageLength ), msgSize );
 
 
indiContainer->SetIndicatorState(
 
TUid::Uid( EAknNaviPaneEditorIndicatorMessageLength ),
 
EAknIndicatorStateOn);
 
}
 
 
 
//Push the object onto the navi pane.
 
iNaviPane->PushL( *iNaviDecorator );
 
}
 
//------------------------------------------------------------------------------

下面的这个示例代码，演示了如何在导航栏中显示一个图标：

//------------------------------------------------------------------------------
 
CFbsBitmap* bitmap = NULL;
 
CFbsBitmap* mask = NULL;
 
CEikStatusPane* statusPane = iEikonEnv->AppUiFactory()->StatusPane();
 
CAknNavigationControlContainer* naviPane =
 
(CAknNavigationControlContainer*)statusPane->ControlL(
 
TUid::Uid(EEikStatusPaneUidNavi));
 
// Create an icon
 
AknIconUtils::CreateIconLC (bitmap, mask, KIconFile,
 
EMbmCarsvgCircle, EMbmCarsvgCircle_mask); //KIconFile is the .mif file
 
 
TSize size(30,30);
 
AknIconUtils::SetSize(bitmap, size); // Sets the size of the extracted image
 
//Create a Navi Decorator encapsulation for the image.
 
CAknNavigationDecorator* naviDecorator =
 
naviPane->CreateNavigationImageL(bitmap, mask);
 
//Push the image onto the navi pane.
 
naviPane->PushL(*naviDecorator);
 
//------------------------------------------------------------------------------

需要的头文件及库文件有：

#include <aknnavi.h>               // for CAknNavigationControlContainer
 
#include <eikspane.h>              // for CEikStatusPane
 
#include <aknnavide.h>             // for CAknNavigationDecorator
 
#include <akniconutils.h>          // for AknIconUtils
 
#include <aknindicatorcontainer.h> // for CAknIndicatorContainer
 
LIBRARY     aknicon.lib
 
LIBRARY     fbscli.lib
 
LIBRARY     avkon.lib

注意：程序在前台时这些导航栏上的文字和图标才得以显现，但手机待机时却不会处理。