i have following architecture: +-----------------+ | collection | | | | | | | | | +-----------------+ | ^ | | create() | | | | v | getitem(b) +------------+ | | item | | | | | | +------+ | | +------------+ a class managing collection of items, creates items. , these items may need other items collection. the actual code in python, , collection passes parameter created item . see it, bad practice. improvement can see pass few functions of collection needed item , instead of whole instance. for example: class collection: getitem(self, id): ... createitem(self, id): item = item(id, self) # <-- pass self ... class item: __init__(self, id, col): ... col.getite...
i trying remove item recyclerview , error. java.lang.illegalstateexception: cannot call method while recyclerview computing layout or scrolling i using notifydatasetchanged() . how can solve this? here adapter code public class listadapters extends recyclerview.adapter<listadapters.myviewholder> { public arraylist<string> tvdatalist; context c; int pos; listadapters.myviewholder myviewholder; private layoutinflater layoutinflater; int[] arr; public class myviewholder extends recyclerview.viewholder implements view.onclicklistener { public edittext edttxt; public checkbox cb; public myviewholder(view view) { super(view); edttxt = (edittext) view.findviewbyid(r.id.edttxt); cb = (checkbox) view.findviewbyid(r.id.cb); } @override public void onclick(view v) { } } public listadapters(context c, arraylist<string> tvdatali...
just wondering if guys can code. it works serving images not pdf brochure. in advance func main(){ http.handlefunc("/", func(w http.responsewriter, r *http.request){ filename := "/var/www/filedipenser/brochure.pdf" streampdfbytes, err := ioutil.readfile( filename ) if err != nil { fmt.println(err) os.exit(1) } b := bytes.newbuffer(streampdfbytes) w.header().set("content-type", "application/pdf") if _, err := b.writeto(w); err != nil { fmt.fprintf(w, "%s", err) } w.write([]byte("pdf generated")) }) err := http.listenandserve(":4111", nil) if err != nil { log.fatal("listenandserve: ", err) fmt.println(err) } } the code bit inefficient appears working. however, pdf viewers might sensitive extraneous output adding end of http response stream...
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