Code example for DataSetObservable

Methods: notifyInvalidated

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	    public void notifyDataSetChanged() { 
	        mDataSetObservable.notifyChanged();
	    } 
 
	    public void notifyDataSetInvalidated() { 
	        mDataSetObservable.notifyInvalidated();
	    } 
 
		public int getItemCount(){ 
			return 0; 
		} 
 
		public int getItemViewTypeCount(){ 
			return 1; 
		} 
 
		public int getItemViewType(int position){
			return 0; 
		} 
 
		public abstract View getView(