Check to see if Visualforce page is inside Salesforce1

gistfile1.java

//Determin if this is SF1 app
public static Boolean isSF1(){
	if(!Utils.checkNullOrBlank(ApexPages.currentPage().getParameters().get('sfdcIFrameHost')) ||
		!Utils.checkNullOrBlank(ApexPages.currentPage().getParameters().get('sfdcIFrameOrigin')) ||
		ApexPages.currentPage().getParameters().get('isdtp') == 'p1' ||
		(ApexPages.currentPage().getParameters().get('retURL') != null && ApexPages.currentPage().getParameters().get('retURL').contains('projectone') )
	){
		return true;
	}else{
		return false;
	}
}