performance - Why memory keeps increasing when you scroll in a List on Android -
i watching monitor on android , notice memory keeps increasing when scroll down , up. using adaper. it's supposed reuse views, seems doesn't work.
as can see in images below memory starts @ 9.94 mb , increase @ 25.82 mb scrolling down , up.
you can see code use.
public class listmainfragment extends fragment implements loadermanager.loadercallbacks<list<earthquake>> { public listmainfragment() { // required empty public constructor } listview listview; @override public view oncreateview(final layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view viewroot = inflater.inflate(r.layout.fragment_mainlist, container, false); final arraylist<earthquake> earthquake = (arraylist<earthquake>) new earthquakecontroller(new earthquakesjson()).getlistofearthquakes(); listview = (listview)viewroot.findviewbyid(r.id.list_view); earthquakeadapter noteadapter = new earthquakeadapter(getactivity(), earthquake); listview.setadapter(noteadapter); listview.setonitemclicklistener(new adapterview.onitemclicklistener() { //final string mensaje = notas.get(position).getmag(); @override public void onitemclick(adapterview<?> parent, view view, int position, long id) { intent intent = new intent(intent.action_view); intent.setdata(uri.parse(earthquake.get(0).getmapurl())); log.w("listview", "se despliega la siguente url " + earthquake.get(0).getmapurl()); startactivity(intent); } }); return viewroot; } } the adapter:
public class earthquakeadapter extends arrayadapter <earthquake> { public earthquakeadapter(context context, arraylist<earthquake> notas) { super(context, 0, notas); } private static final string location_separator = " of"; view view; @nonnull @override public view getview(int position, view convertview, viewgroup parent) { /*if(convertview == null){ convertview = layoutinflater.from(getcontext()).inflate(r.layout.list_item,parent,false); */ if (convertview == null) { convertview = layoutinflater.from(getcontext()).inflate(r.layout.list_item,parent,false); log.w("applist", "converview es null"); } earthquake note = getitem(position); date dateobject = new date(note.gettimeinmilliseconds()); textview locationoffset = (textview)convertview.findviewbyid(r.id.listitem_tv_locationoffset); textview place = (textview)convertview.findviewbyid(r.id.listitem_tv_place); textview date = (textview)convertview.findviewbyid(r.id.lisitem_tv_date); textview time = (textview)convertview.findviewbyid(r.id.lisitem_tv_time); textview mag = (textview) convertview.findviewbyid(r.id.listitem_tv_mag); gradientdrawable magnitudcicle = (gradientdrawable) mag.getbackground(); magnitudcicle.setcolor(getmagnitudcolor(note.getmag())); string str_locationoffset, str_place; if (note.getplace().contains(location_separator)) { string [] locations = note.getplace().split(location_separator); str_locationoffset = locations[0]; str_place = locations[1]; } else { str_place = note.getplace(); str_locationoffset = getcontext().getstring(r.string.near_the); } mag.settext( new decimalformat("0.0").format(note.getmag())); date.settext(formatdate(dateobject)); place.settext(str_place); time.settext(formattime(dateobject)); locationoffset.settext(str_locationoffset); /* final string mensaje = title.gettext().tostring(); convertview.setonclicklistener(new view.onclicklistener() { @override public void onclick(view v) { toast.maketext(getcontext(),mensaje,toast.length_short).show(); } });*/ return convertview; } }
you should use recycler view better performance.
from: https://developer.android.com/training/material/lists-cards.html
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