android - Why do I load more than once when implementing load more data on the bottom of recyclerview? -


i implement following code. works, retrieve more tha once, makes many duplication in data. how make run retrieve more data once?

final linearlayoutmanager layoutmanager = (linearlayoutmanager) getlayoutmanager();    recyclerview.setonscrolllistener(new recyclerview.onscrolllistener() {  	boolean loading = true;    	@override  	public void onscrolled(recyclerview recyclerview, int dx, int dy) {    	    int pastvisibleitems, visibleitemcount, totalitemcount;  	    visibleitemcount = layoutmanager.getchildcount();  	    totalitemcount = layoutmanager.getitemcount();  	    pastvisibleitems = layoutmanager.findfirstvisibleitemposition();    	    if (loading) {  		if ((visibleitemcount + pastvisibleitems) >= totalitemcount) {  		    loading = false;  		    //retrieve more data internet  		    loading = true;  		}  	    }  	}  });

it turns out below algorithm better

private int previoustotal = 0;  private boolean loading = true;  private int visiblethreshold = 5;  int firstvisibleitem, visibleitemcount, totalitemcount;    mrecyclerview.setonscrolllistener(new recyclerview.onscrolllistener() {        @override      public void onscrolled(recyclerview recyclerview, int dx, int dy) {          super.onscrolled(recyclerview, dx, dy);            visibleitemcount = mrecyclerview.getchildcount();          totalitemcount = mlayoutmanager.getitemcount();          firstvisibleitem = mlayoutmanager.findfirstvisibleitemposition();            if (loading) {              if (totalitemcount > previoustotal) {                  loading = false;                  previoustotal = totalitemcount;              }          }          if (!loading && (totalitemcount - visibleitemcount)               <= (firstvisibleitem + visiblethreshold)) {              // end has been reached                log.i("...", "end called");                //                loading = true;          }      }  });

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