How to load json data into fragment in android -
i want show 3 fragments in activity , load data json in fragments! want show each json data 1 fragment, in application load 3 fragments json datas in first enter application.
for example : when first enter application load of fragments datas, want load data when show fragment (swipe on fragment).
fragment 1 codes:
public class free_fragment extends fragment { private recyclerview mrecyclerview; private free_recycler_adapter madapter; private recyclerview.layoutmanager mlayoutmanager; private list<datamodel> datamodels = new arraylist<datamodel>(); private context context; @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view view = inflater.inflate(r.layout.fragment_free_layout, container, false); context = getcontext(); loaddata(); ///----- recyclerview ----- mrecyclerview = (recyclerview) view.findviewbyid(r.id.pdf_recyclerview); mrecyclerview.sethasfixedsize(true); mrecyclerview.setlayoutmanager(new linearlayoutmanager(getactivity())); madapter = new free_recycler_adapter(context, datamodels); mrecyclerview.setadapter(madapter); return view; } @subscribe public void onevent(myevent event) { list<datamodel> datamodels = event.getinfomodels(); if (event.fragmenttag.equals("forfragment1")) { madapter.add(datamodels); madapter.notifydatasetchanged(); } } private void loaddata() { freedatainfo datainfo = new freedatainfo(); // here getmaindatainfo() should return server response datainfo.getfreedatainfo(context); } @override public void onresume() { super.onresume(); eventbus.getdefault().register(this); } @override public void onpause() { eventbus.getdefault().unregister(this); super.onpause(); } } fragment 1 asynctask codes:
public class freedatainfo { private context mcontext; private string serveraddress = freeserver_ip.getfreeip(); public void getfreedatainfo(context context) { mcontext = context; new getinfo().execute(serveraddress + "limit=10"); } private class getinfo extends asynctask<string, void, string> { eventbus bus = eventbus.getdefault(); private string ou_response; private list<datamodel> infomodels = new arraylist<>(); private progressdialog dialog; @override protected void onpreexecute() { //customprocessdialog.createandshow(mcontext); dialog = new progressdialog(mcontext); this.dialog.setmessage("شکیبا باشید..."); this.dialog.show(); } @override protected string doinbackground(string... params) { okhttpclient client = new okhttpclient(); //string url = (string) params[0]; request request = new request.builder() .url(serveraddress + "limit=10") .cachecontrol(cachecontrol.force_network) .build(); response response; try { response = client.newcall(request).execute(); ou_response = response.body().string(); response.body().close(); if (ou_response != null) { try { jsonobject postobj = new jsonobject(ou_response); jsonarray postsarray = postobj.optjsonarray("result"); (int = 0; <= postsarray.length(); i++) { jsonobject postobject = (jsonobject) postsarray.get(i); int id = postobject.getint("id"); log.d("id", string.valueof(id)); string title = postobject.getstring("title"); string description = postobject.getstring("description"); string image = postobject.getstring("image"); string category = postobject.getstring("categoryname"); string date = postobject.getstring("publishdate"); log.d("data", "post id: " + id); log.d("data", "post title: " + title); log.d("data", "post image: " + image); log.d("data", "---------------------------------"); //use title , id per requirement infomodels.add(new datamodel(id, title, description, category, date, image)); } } catch (jsonexception e) { e.printstacktrace(); log.e("error", string.valueof(e)); } } } catch (ioexception e) { e.printstacktrace(); log.e("error2", string.valueof(e)); } return ou_response; } @override protected void onpostexecute(string result) { //customprocessdialog.dissmis(); //stop progress if (dialog.isshowing()) { dialog.dismiss(); } if (result != null) { bus.post(new myevent("forfragment1", infomodels)); } else { toast.maketext(mcontext, "empty", toast.length_short).show(); } } } } fragment 2 codes:
public class paid_fragment extends fragment { private recyclerview mrecyclerview; private paid_recycler_adapter madapter; private recyclerview.layoutmanager mlayoutmanager; private list<datamodel> datamodels = new arraylist<datamodel>(); private context context; @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view view = inflater.inflate(r.layout.fragment_paid_layout, container, false); context = getcontext(); /* if (!eventbus.getdefault().isregistered(this)) { eventbus.getdefault().register(this); }*/ loaddata(); ///----- recyclerview ----- mrecyclerview = (recyclerview) view.findviewbyid(r.id.voice_recyclerview); mrecyclerview.sethasfixedsize(true); mrecyclerview.setlayoutmanager(new linearlayoutmanager(getactivity())); madapter = new paid_recycler_adapter(context, datamodels); mrecyclerview.setadapter(madapter); return view; } @subscribe public void onevent(myevent event) { list<datamodel> datamodels = event.getinfomodels(); /* if (datamodels.size() > 0) { datamodels.remove(datamodels.size() - 1); madapter.notifyitemremoved(datamodels.size()); //madapter.setloaded(); }*/ if (event.fragmenttag.equals("forfragment2")) { madapter.add(datamodels); madapter.notifydatasetchanged(); } } private void loaddata() { paiddatainfo datainfo = new paiddatainfo(); // here getmaindatainfo() should return server response datainfo.getpaiddatainfo(context); } @override public void onresume() { super.onresume(); eventbus.getdefault().register(this); } @override public void onpause() { eventbus.getdefault().unregister(this); super.onpause(); } } fragment 2 asynctask codes:
public class paiddatainfo { private context mcontext; private string serveraddress = paidserver_ip.getpaidip(); public void getpaiddatainfo(context context) { mcontext = context; new getinfo().execute(serveraddress + "limit=10"); } private class getinfo extends asynctask<string, void, string> { eventbus bus = eventbus.getdefault(); private string ou_response; private list<datamodel> infomodels = new arraylist<>(); private progressdialog dialog; @override protected void onpreexecute() { //customprocessdialog.createandshow(mcontext); //infomodels = new arraylist<>(); // initiate progress dialog = new progressdialog(mcontext); this.dialog.setmessage("شکیبا باشید..."); this.dialog.show(); infomodels.clear(); } @override protected string doinbackground(string... params) { okhttpclient client = new okhttpclient(); //string url = (string) params[0]; request request = new request.builder() .url(serveraddress + "limit=10") .cachecontrol(cachecontrol.force_network) .build(); response response; try { response = client.newcall(request).execute(); ou_response = response.body().string(); response.body().close(); if (ou_response != null) { try { jsonobject postobj = new jsonobject(ou_response); jsonarray postsarray = postobj.optjsonarray("result"); infomodels = new arraylist<>(); (int = 0; <= postsarray.length(); i++) { jsonobject postobject = (jsonobject) postsarray.get(i); int id = postobject.getint("id"); log.d("id", string.valueof(id)); string title = postobject.getstring("title"); string description = postobject.getstring("full_description"); string image = postobject.getstring("image"); string category = postobject.getstring("categoryname"); string date = postobject.getstring("publishdate"); log.d("data", "post id: " + id); log.d("data", "post title: " + title); log.d("data", "post desc: " + description); log.d("data", "post image: " + image); log.d("data", "---------------------------------"); //use title , id per requirement infomodels.add(new datamodel(id, title, description, category, date, image)); } } catch (jsonexception e) { e.printstacktrace(); log.e("error", string.valueof(e)); } } } catch (ioexception e) { e.printstacktrace(); log.e("error2", string.valueof(e)); } return ou_response; } @override protected void onpostexecute(string result) { //stop progress if (dialog.isshowing()) { dialog.dismiss(); } //customprocessdialog.dissmis(); if (result != null) { bus.post(new myevent("forfragment2", infomodels)); } else { toast.maketext(mcontext, "empty", toast.length_short).show(); } } } } mainactivity codes :
public class main_page extends appcompatactivity { private collapsingtoolbarlayout mcollapsingtoolbarlayout; private toolbar toolbar; private tablayout tablayout; private viewpager viewpager; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main__page); mcollapsingtoolbarlayout = (collapsingtoolbarlayout) findviewbyid(r.id.collapsing_toolbar_layout); //mcollapsingtoolbarlayout.settitle(getresources().getstring(r.string.app_name)); toolbar = (toolbar) findviewbyid(r.id.toolbar); setsupportactionbar(toolbar); //getsupportactionbar().setdisplayhomeasupenabled(true); viewpager = (viewpager) findviewbyid(r.id.viewpager); setupviewpager(viewpager); tablayout = (tablayout) findviewbyid(r.id.tabs); tablayout.setupwithviewpager(viewpager); setuptabicons(); } /** * adding custom view tab */ private void setuptabicons() { textview tabone = (textview) layoutinflater.from(this).inflate(r.layout.custom_tab, null); tabone.settext(r.string.free_fragment_title); tabone.setcompounddrawableswithintrinsicbounds(0, r.drawable.ic_download_image, 0, 0); tablayout.gettabat(0).setcustomview(tabone); textview tabtwo = (textview) layoutinflater.from(this).inflate(r.layout.custom_tab, null); tabtwo.settext(r.string.paid_fragment_title); tabtwo.setcompounddrawableswithintrinsicbounds(0, r.drawable.ic_paid_download_image, 0, 0); tablayout.gettabat(1).setcustomview(tabtwo); textview tabthree = (textview) layoutinflater.from(this).inflate(r.layout.custom_tab, null); tabthree.settext(r.string.pdf_fragment_title); tabthree.setcompounddrawableswithintrinsicbounds(0, r.drawable.ic_pdf_icon, 0, 0); tablayout.gettabat(2).setcustomview(tabthree); } /** * adding fragments viewpager * @param viewpager */ private void setupviewpager(viewpager viewpager) { viewpageradapter adapter = new viewpageradapter(getsupportfragmentmanager()); adapter.addfrag(new free_fragment(), "رایگان ها"); adapter.addfrag(new paid_fragment(), "پرداختی ها"); adapter.addfrag(new pdf_fragment(), "مقالات"); viewpager.setadapter(adapter); } class viewpageradapter extends fragmentpageradapter { private final list<fragment> mfragmentlist = new arraylist<>(); private final list<string> mfragmenttitlelist = new arraylist<>(); public viewpageradapter(fragmentmanager manager) { super(manager); } @override public fragment getitem(int position) { return mfragmentlist.get(position); } @override public int getcount() { return mfragmentlist.size(); } public void addfrag(fragment fragment, string title) { mfragmentlist.add(fragment); mfragmenttitlelist.add(title); } @override public charsequence getpagetitle(int position) { return mfragmenttitlelist.get(position); } } how can fix , load fragment data show fragment ? <3
there callback method gets invoked when fragment visible user. can trigger loaddata() in method. have boolean tells if data fetched. refer below lines of code :
in fragment code add following method.
@override public void setuservisiblehint(boolean isvisibletouser) { misvisibletouser = isvisibletouser; if (isvisibletouser && !isdatafetched && getcontext() != null) { context = getcontext(); loaddata(); //remove call oncreateview } } in onevent method make following change.
@subscribe public void onevent(myevent event) { list<datamodel> datamodels = event.getinfomodels(); if (event.fragmenttag.equals("forfragment1")) { madapter.add(datamodels); isdatafetched = true; madapter.notifydatasetchanged(); } } add instance variable in fragment code.
private boolean isdatafetched; private boolean misvisibletouser; finally modify oncreateview()
if(misvisibletouser) loaddata(); make sure these changes both fragments.
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