Blackberry 在主屏幕上创建通知

当应用程序在后台运行时，我想在主屏幕上创建通知图标，在应用程序中有用于检查即将到来的响应的线程，我想在主屏幕上显示使用通知图标，可以帮助我吗？？？

使用以下代码：

public static void registerIndicator() {
        EncodedImage mImageGreen = EncodedImage.getEncodedImageResource("res/mail.png");
        ApplicationIcon mIconGreen = new ApplicationIcon(mImageGreen);
        ApplicationIcon mIcon = mIconGreen;
        try {
            ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance();
            ApplicationIndicator indicator = reg.register(mIcon, false, true);
        } catch (Exception ex) { }
    }

public static void updateIndicatorValue(int value) {

    try {
        ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance(); 
        ApplicationIndicator appIndicator = reg.getApplicationIndicator(); 
        appIndicator.setValue(value); 
    } catch (Exception e) { }
}

public static int getIndicatorValue() {
    try {
        ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance(); 
        ApplicationIndicator appIndicator = reg.getApplicationIndicator(); 
        return appIndicator.getValue(); 
    } catch (Exception e) { }
    return -1;
}