int getSmallIcon() {
        String smallIconPath = options.optString("androidSmallIcon");

        // Try to get the resource from the app resources or system resources
        int resId = assetUtil.getResourceId(smallIconPath, AssetUtil.RESOURCE_TYPE_DRAWABLE);

        // Log error, if no icon is found and fallback to a system icon, which should exists
        if (resId == 0) {
            Log.e(TAG, "androidSmallIcon not found, using system icon 'ic_popup_reminder', androidSmallIcon=" + smallIconPath);
            // Fallback to a system icon, which should exists
            resId = assetUtil.getResourceId("ic_popup_reminder", AssetUtil.RESOURCE_TYPE_DRAWABLE);
        }

        return resId;
    }
Gets the small icon resource, which will be used to represent the notification in the status bar.
The platform template for the expanded view will draw this icon in the left, unless a large icon
has also been specified, in which case the small icon will be moved to the right-hand side.

Defaults to 'ic_popup_reminder' if not set, or wrongly set.
src/android/Options.java