Is LayoutInflater a singleton and why?

No, LayoutInflater is not a singleton. It is created through Context.getSystemService() or LayoutInflater.from(context). Each time one of these methods is called, an instance of LayoutInflater associated with that Context is returned. Although the instance returned for the same Context will be the same, this does not make it a singleton in the traditional sense, where only one instance exists for the entire application or process. LayoutInflater is instantiated on demand for a specific Context.