向下滚动时Android Recyclerview滞后

Question

向下滚动时Android Recyclerview滞后

Joh*_*ser 7 android lag android-fragments android-recyclerview

我有一个带有recyclerview(GridlayoutManager)的片段.recyclerview中的项目并不复杂或有图像,但向下滚动Recyclerview滞后(在Nexus 5上测试).我将hasFixedSize和hasStableIds设置为true有谁知道为什么会这样？提前致谢.

分段

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();
    }
  }
}

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布局

<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>

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适配器

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);
  }
}

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logcat的

 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
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Answer 1

Jay*_*lim -1

适配器中扩展 ViewHolder 类的类应该是静态类。这肯定会提高性能。您应该如下编辑您的代码。

代替

class timetableViewHolder extends RecyclerView.ViewHolder implements
View.OnClickListener

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和

static class timetableViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener

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