Android Recyclerview delay while scrolling down

Question

I have a fragment with recyclerview (GridlayoutManager) inside. Elements in recyclerview are not complicated or have images, but when scrolling through recyclerview lags (tested on Nexus 5). I set hasFixedSize and hasStableIds to true Does anyone have an idea why this is happening? Thanks in advance.

Fragment

public class EditTimetableFragment extends Fragment implements TimetableRecyclerViewAdapter.ClickListener { public EditTimetableFragment() {} DAO dao; SharedPreferences sharedPreferences; SharedPreferences.Editor editor; RecyclerView recyclerViewTimetable; Spinner spinnerSubject; TimetableRecyclerViewAdapter timetableRecyclerViewAdapter; TaskSubjectSpinnerAdapter taskSubjectSpinnerAdapter; List<Subject> subjectList; List<Timetable> timetableList; FloatingActionButton fabAddSubject; boolean saturday, sunday; int dayLength, hourLength; TextView textViewSa, textViewSu; LinearLayout week, linearLayout; View view; public View getView() { return view; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this dao = new DAO(getActivity()); getTimetableSettings(); subjectList = dao.getAllSubjectsAlphabetical(); timetableList = dao.getTimetableList(dayLength, saturday, sunday); view = inflater.inflate(R.layout.fragment_edit_timtable, container, false); Toast.makeText(getActivity(),"onCreateView",Toast.LENGTH_SHORT).show(); linearLayout = (LinearLayout) view.findViewById(R.id.linearLayout); fabAddSubject = (FloatingActionButton) view.findViewById(R.id.fabAddSubject); fabAddSubject.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(getActivity(), AddSubjectActivity.class)); } }); textViewSa = (TextView) view.findViewById(R.id.textViewSa); textViewSu = (TextView) view.findViewById(R.id.textViewSu); week = (LinearLayout) view.findViewById(R.id.week); setRecyclerViewTimetable(view); setSpinnerSubject(view); if (saturday && sunday) { textViewSa.setVisibility(View.VISIBLE); textViewSu.setVisibility(View.VISIBLE); } else if (saturday && !sunday) { textViewSa.setVisibility(View.VISIBLE); textViewSu.setVisibility(View.GONE); } else if (!saturday && sunday) { textViewSa.setVisibility(View.GONE); textViewSu.setVisibility(View.VISIBLE); } else if (!saturday && !sunday) { textViewSa.setVisibility(View.GONE); textViewSu.setVisibility(View.GONE); } return view; } public void setRecyclerViewTimetable(View view) { recyclerViewTimetable = (RecyclerView) view.findViewById(R.id.recyclerViewTimetable); timetableRecyclerViewAdapter = new TimetableRecyclerViewAdapter( getActivity(), true, saturday, sunday, dayLength); timetableRecyclerViewAdapter.setClickListener(this); recyclerViewTimetable.setHasFixedSize(true); recyclerViewTimetable.setLayoutManager( new GridLayoutManager(getActivity(), dayCount())); recyclerViewTimetable.setAdapter(timetableRecyclerViewAdapter); } private void setSpinnerSubject(View view) { spinnerSubject = (Spinner) view.findViewById(R.id.spinnerSubject); taskSubjectSpinnerAdapter = new TaskSubjectSpinnerAdapter(getActivity(), subjectList); spinnerSubject.setAdapter(taskSubjectSpinnerAdapter); } private void getTimetableSettings() { sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity()); editor = sharedPreferences.edit(); saturday = sharedPreferences.getBoolean(getResources().getString(R.string.settingSaturday), false); sunday = sharedPreferences.getBoolean(getResources().getString(R.string.settingSunday), false); dayLength = sharedPreferences.getInt(getResources().getString(R.string.settingDay), 10); hourLength = sharedPreferences.getInt(getResources().getString(R.string.settingHour), 45); //Toast.makeText(getActivity(), "dayCount=" + dayCount() + " Sat" + saturday + " Sun" + sunday, Toast.LENGTH_SHORT).show(); } private int dayCount() { int a = 0; if (saturday && sunday) { a = 7; } else if (saturday && !sunday) { a = 6; } else if (!saturday && sunday) { a = 6; } else if (!saturday && !sunday) { a = 5; } return a; } @Override public void onResume() { super.onResume(); getTimetableSettings(); subjectList = dao.getAllSubjectsAlphabetical(); timetableList = dao.getTimetableList(dayLength, saturday, sunday); setSpinnerSubject(view); setRecyclerViewTimetable(view); if (saturday && sunday) { textViewSa.setVisibility(View.VISIBLE); textViewSu.setVisibility(View.VISIBLE); } else if (saturday && !sunday) { textViewSa.setVisibility(View.VISIBLE); textViewSu.setVisibility(View.GONE); } else if (!saturday && sunday) { textViewSa.setVisibility(View.GONE); textViewSu.setVisibility(View.VISIBLE); } else if (!saturday && !sunday) { textViewSa.setVisibility(View.GONE); textViewSu.setVisibility(View.GONE); } } @Override public void itemClicked(View v, int position) { timetableList = dao.getTimetableList(dayLength, saturday, sunday); subjectList = dao.getAllSubjectsAlphabetical(); if (!subjectList.isEmpty()) { Timetable timetableOld = timetableList.get(position); Subject subject = subjectList.get(spinnerSubject.getSelectedItemPosition()); Timetable timetableNew; if (timetableOld.getSubjectId().equals(subject.getId())) { timetableNew = dao.updateTimetable(timetableOld.getX(), timetableOld.getY(), ""); } else { timetableNew = dao.updateTimetable(timetableOld.getX(), timetableOld.getY(), subject.getId()); } timetableRecyclerViewAdapter.update(timetableNew, position); } else { Snackbar.make(linearLayout, R.string.AddSubjectsQuestion, Snackbar.LENGTH_LONG) .setAction(R.string.Yes, new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(getActivity(), AddSubjectActivity.class)); } }).show(); } } } 

Markup

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:weightSum="1" tools:context="com.feserware.learn.Timetable.EditTimetableActivity"> <include android:id="@+id/week" layout="@layout/week" /> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclerViewTimetable" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_above="@+id/linearLayout" android:layout_weight="1" /> <LinearLayout android:id="@+id/linearLayout" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="false" android:layout_alignParentStart="true" android:layout_gravity="center_horizontal" android:background="@color/primary" android:minHeight="?attr/actionBarSize" android:orientation="horizontal" android:padding="19dp"> <Spinner android:id="@+id/spinnerSubject" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="3" /> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" /> </LinearLayout> <com.melnykov.fab.FloatingActionButton android:id="@+id/fabAddSubject" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentEnd="true" android:layout_alignParentRight="true" android:layout_margin="16dp" android:src="@android:drawable/ic_input_add" android:tint="#fff" app:fab_type="mini" /> </RelativeLayout> 

Adapter

 public class TimetableRecyclerViewAdapter extends RecyclerView.Adapter <TimetableRecyclerViewAdapter.timetableViewHolder> { List<Timetable> timetableList; Context context; ClickListener clickListener; LayoutInflater inflater; DAO dao; boolean showHour, saturday, sunday; int hours; public TimetableRecyclerViewAdapter(Context context, boolean showHour, boolean saturday, boolean sunday, int hours) { this.inflater = LayoutInflater.from(context); this.context = context; dao = new DAO(context); this.timetableList = dao.getTimetableList(hours, saturday, sunday); this.showHour = showHour; this.saturday = saturday; this.sunday = sunday; this.hours = hours; setHasStableIds(true); } @Override public timetableViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = inflater.inflate(R.layout.item_timetable, parent, false); timetableViewHolder holder = new timetableViewHolder(view); return holder; } @Override public void onBindViewHolder(timetableViewHolder holder, int position) { Timetable timetable = timetableList.get(position); Subject subject = dao.getSubject(timetable.getSubjectId()); holder.textViewTimetableSubjectShort.setText(""); holder.textViewTimetableRoom.setText(""); if (subject == null) { dao.updateTimetable(timetable.getX(), timetable.getY(), ""); } if (timetable.getSubjectId().isEmpty()) { holder.textViewTimetableSubjectShort.setText(timetable.getY() + ""); holder.linearLayoutBackground.setBackgroundColor(Color.WHITE); } else { holder.textViewTimetableSubjectShort.setText(subject.getSubjectShort()); holder.textViewTimetableRoom.setText(subject.getRoom()); holder.linearLayoutBackground.setBackgroundColor(subject.getColor()); } } @Override public long getItemId(int position) { return position; } @Override public int getItemCount() { return timetableList.size(); } public void setClickListener(ClickListener clickListener) { this.clickListener = clickListener; } class timetableViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { TextView textViewTimetableSubjectShort, textViewTimetableRoom; LinearLayout linearLayoutBackground; public timetableViewHolder(View itemView) { super(itemView); textViewTimetableSubjectShort = (TextView) itemView.findViewById(R.id.textViewSubjectShort); textViewTimetableRoom = (TextView) itemView.findViewById(R.id.textViewSubjectRoom); linearLayoutBackground = (LinearLayout) itemView.findViewById(R.id.linearLayoutBackground); itemView.setOnClickListener(this); } @Override public void onClick(View v) { if (clickListener != null) { clickListener.itemClicked(v, getLayoutPosition()); } } } public interface ClickListener { void itemClicked(View v, int postion); } public void update(Timetable timetable, int pos) { timetableList.set(pos, timetable); notifyItemChanged(pos); } } 

Logcat

  09-11 17:48:32.098 31535-31535/com.feserware.learn D/TimetableRecyclerVH﹕ Constructor 09-11 17:48:32.148 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.148 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.156 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 0 09-11 17:48:32.159 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.159 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.165 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 1 09-11 17:48:32.169 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.170 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.175 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 2 09-11 17:48:32.178 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.178 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.184 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 3 09-11 17:48:32.188 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.189 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.195 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 4 09-11 17:48:32.203 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.203 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.209 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 5 09-11 17:48:32.211 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.211 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.217 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 6 09-11 17:48:32.222 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.222 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.228 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 7 09-11 17:48:32.231 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.231 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.237 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 8 09-11 17:48:32.239 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.239 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.246 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 9 09-11 17:48:32.252 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.252 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.259 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 10 09-11 17:48:32.261 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.261 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.264 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 11 09-11 17:48:32.266 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.266 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.269 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 12 09-11 17:48:32.272 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.272 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.276 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 13 09-11 17:48:32.278 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.278 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.281 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 14 09-11 17:48:32.288 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.288 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.292 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 15 09-11 17:48:32.320 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.320 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.326 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 16 09-11 17:48:32.328 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.328 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.333 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 17 09-11 17:48:32.335 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.335 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.342 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 18 09-11 17:48:32.344 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.344 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.349 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 19 09-11 17:48:32.358 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.358 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.367 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 20 09-11 17:48:32.370 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.370 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.376 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 21 09-11 17:48:32.378 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.378 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.383 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 22 09-11 17:48:32.385 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.385 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.393 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 23 09-11 17:48:32.395 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.395 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.400 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 24 09-11 17:48:32.422 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.422 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.430 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 25 09-11 17:48:32.432 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.432 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.437 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 26 09-11 17:48:32.443 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.443 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.450 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 27 09-11 17:48:32.456 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.457 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.464 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 28 09-11 17:48:32.466 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:32.466 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:32.469 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 29 09-11 17:48:32.631 31535-31589/com.feserware.learn D/OpenGLRenderer﹕ endAllStagingAnimators on 0xa1b9ed00 (RippleDrawable) with handle 0xa188dfb0 09-11 17:48:35.406 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:35.406 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:35.410 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 30 09-11 17:48:35.429 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:35.429 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:35.432 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 31 09-11 17:48:35.446 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:35.446 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:35.450 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 32 09-11 17:48:35.464 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:35.464 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:35.469 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 33 09-11 17:48:35.482 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:35.483 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:35.487 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 34 09-11 17:48:35.505 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 35 09-11 17:48:35.509 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 36 09-11 17:48:35.524 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 37 09-11 17:48:35.538 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 38 09-11 17:48:35.552 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:35.552 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:35.557 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 39 09-11 17:48:35.575 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 40 09-11 17:48:35.580 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 41 09-11 17:48:35.596 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 42 09-11 17:48:35.611 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 43 09-11 17:48:35.632 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:35.632 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:35.637 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 44 09-11 17:48:35.654 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 45 09-11 17:48:35.668 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 46 09-11 17:48:35.682 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 47 09-11 17:48:35.696 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 48 09-11 17:48:35.711 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 49 09-11 17:48:35.764 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 50 09-11 17:48:35.781 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 51 09-11 17:48:35.797 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 52 09-11 17:48:35.813 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 53 09-11 17:48:35.827 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:35.827 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:35.831 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 54 09-11 17:48:35.863 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 55 09-11 17:48:35.912 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 56 09-11 17:48:35.926 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 57 09-11 17:48:35.943 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 58 09-11 17:48:35.962 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 59 09-11 17:48:35.981 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onBindViewHolder | 69 09-11 17:48:36.161 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 70 09-11 17:48:36.176 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 71 09-11 17:48:36.191 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 72 09-11 17:48:36.206 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 73 09-11 17:48:36.228 31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder 09-11 17:48:36.228 31535-31535/com.feserware.learn D/TtRecycler﹕ onCreateViewHolder 09-11 17:48:36.232 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 74 09-11 17:48:36.249 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 75 09-11 17:48:36.264 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 76 09-11 17:48:36.278 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 77 09-11 17:48:36.293 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 78 09-11 17:48:36.306 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The application may be doing too much work on its main thread. 09-11 17:48:36.539 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 90 09-11 17:48:36.556 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 91 09-11 17:48:36.571 31535-31535/com.feserware.learn D/TtRecycler﹕ onBindViewHolder | 92 

Answer 1

Well, I don’t know what exactly is wrong with your code, but what I can do is to provide you with a sample recycling code that I use, I am sure that you can make a comparison with yours and determine where you can make a mistake , this is an extensible recycler with a child having a horizontal list with images in it, I do not experience the lags that I use huawei Y300, this is a low phone, I chose this phone because I knew if my code would work fine on it it was would be on most phones, so here is an example of my Expandable recycler adapter, my code, although suffering from memory usage, it removes up to about 20 MB after loading about 20 elements with 5 images

 public class ExpandableCategoryAdapter extends ExpandableRecyclerAdapter<CategoryParentViewHolder, CategoryChildViewHolder> { /** * Primary constructor. Sets up {@link #mParentItemList} and {@link #mItemList}. * <p> * Changes to {@link #mParentItemList} should be made through add/remove methods in * {@link ExpandableRecyclerAdapter} * * @param parentItemList List of all {@link ParentListItem} objects to be * displayed in the RecyclerView that this * adapter is linked to */ private LayoutInflater mInflater; private CategoryChildViewHolder childViewHolder; private Context context; private UserDataHolderDB db; //click onitemlisteners //I chose these because they //readily provide the IDS/position private OnItemClickListener addItemListener; private OnItemClickListener gotoListener; public ExpandableCategoryAdapter(OnItemClickListener addItemListener, OnItemClickListener gotoListener,Context context, ArrayList<ExpandableCategoryItem> parentItemList) { super(parentItemList); this.addItemListener = addItemListener; this.gotoListener = gotoListener; this.context = context; mInflater = LayoutInflater.from(context); db = new UserDataHolderDB(context); } //ofcos the interface to implement from public interface OnItemClickListener { public void onItemClick(View view, int position); } @Override public CategoryParentViewHolder onCreateParentViewHolder(ViewGroup parentViewGroup) { View view = mInflater.inflate(R.layout.parent_category, parentViewGroup, false); return new CategoryParentViewHolder(view); } @Override public CategoryChildViewHolder onCreateChildViewHolder(ViewGroup childViewGroup) { View view = mInflater.inflate(R.layout.cloth_min_adapter, childViewGroup, false); return new CategoryChildViewHolder(view); } @Override public void onBindParentViewHolder(CategoryParentViewHolder parentViewHolder, int position, ParentListItem parentListItem) { parentViewHolder.setIsRecyclable(true); ExpandableCategoryItem parentData = (ExpandableCategoryItem) parentListItem; parentViewHolder.mCrimeTitleTextView.setText(parentData.getmDescription()); try { System.err.println("Palette value: " + parentData.getmSideBarColor()); if (parentData.getmSideBarColor() != null) { parentViewHolder.mSideBar.setBackgroundColor(Integer.parseInt(parentData.getmSideBarColor())); parentViewHolder.mSideBar.invalidate(); } }catch (Exception e) { e.printStackTrace(); System.err.println("Palette value could not be decoded"); } if(!parentViewHolder.isExpanded()) { try{ if(childViewHolder.linearLayout != null) { childViewHolder.linearLayout.removeAllViews(); if(parentData.getmSideBarColor() != null) { if(parentData.getmSideBarColor().isEmpty()) { } } // parentViewHolder.mSideBar.getBackground() = } }catch (Exception e) { e.printStackTrace(); } //trash child to save memory } try { //reduce bitmap size to save on memory Bitmap bitmap = BitmapFactory.decodeFile(parentData.getmCategoryImgPath()); bitmap = ResizeImage.getResizedBitmap(bitmap, 100, 100); parentViewHolder.mCategoryImage.setImageBitmap(bitmap); }catch (Exception e) { e.printStackTrace(); } / System.err.println("Parent ID"+parentData.getId()); System.err.println("Parent Description at Given ID: "+parentData.getmDescription()); parentViewHolder.mItemsShow.setText(db.categoryItemsNumber(parentData.getId())); } @Override public void onBindChildViewHolder(CategoryChildViewHolder childViewHolder, int position, Object childListItem) { //Button being assigned the Listener childViewHolder.gotTo.setOnClickListener(v -> gotoListener.onItemClick(v, position)); childViewHolder.addNewItem.setOnClickListener(v -> addItemListener.onItemClick(v, position)); ChildItem data = (ChildItem) childListItem; this.childViewHolder = childViewHolder; int rootViewController = 0; try { childViewHolder.linearLayout.removeAllViews(); }catch (Exception w) { w.printStackTrace(); } if(data.getImgUri() != null) { for (String item : data.getImgUri()) { try { //stop adding images we are past our limit if (rootViewController != 5) { if(item.equals("") || !item.isEmpty()) { Bitmap bitmap = BitmapFactory.decodeFile(item); bitmap = ResizeImage.getResizedBitmap(bitmap, 100, 100); Bitmap bitmap2 = ImageCornerMoulder.getRoundedCornerBitmap(bitmap, calculatePercentage(5, bitmap.getHeight())); //add images we still have enough space rootViewController = (rootViewController + 1); View rootView = LayoutInflater.from(context).inflate(R.layout.expandable_image_item, null); ImageView imageView = (ImageView) rootView.findViewById(R.id.clothItem); rootView.setTag(new ImageObject(Uri.parse(item))); imageView.setImageBitmap(bitmap2); if(bitmap != bitmap2) { bitmap.recycle(); } childViewHolder.linearLayout.addView(rootView, 0); } } } catch (Exception e) { e.printStackTrace(); //set default image Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.clothes); bitmap = ResizeImage.getResizedBitmap(bitmap, 100, 100); Bitmap bitmap2 = ImageCornerMoulder.getRoundedCornerBitmap(bitmap, calculatePercentage(5, bitmap.getHeight())); //add images we still have enough space rootViewController = (rootViewController + 1); View rootView = LayoutInflater.from(context).inflate(R.layout.expandable_image_item, null); ImageView imageView = (ImageView) rootView.findViewById(R.id.clothItem); imageView.setImageBitmap(bitmap); if(bitmap != bitmap) { bitmap.recycle(); } childViewHolder.linearLayout.addView(rootView, 0); } } } childViewHolder.linearLayout.invalidate(); } private int calculatePercentage(int percentage, int target) { int k = (int)(target*(percentage/100.0f)); return k; } } 

how do i use it

  adapter = new ExpandableCategoryAdapter(addItems,goTo,getBaseContext(), data arraylist); recyclerView.setLayoutManager(new LinearLayoutManager(getBaseContext())); recyclerView.setAdapter(adapter); 

Answer 2

The class that extends the ViewHolder class in the adapter must be static. This will certainly improve performance. You must edit your code as shown below.

Replace

 class timetableViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener 

with

 static class timetableViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener 

Answer 3

if the Recyclerview user is upright and your activity contains another element that you have ScrollView , then you should use NestedScrollView instead of ScrollView .

as described in the google documentation. NestedScrollView is similar to ScrollView, but it supports both parent and child parent scroll actions in both new and older versions of Android. Nested scrolling is enabled by default.

I am sure that using NestedScrollView will solve this problem.