Android Recyclerview 向下滚动时滞后

标签 android android-fragments android-recyclerview lag

我有一个 fragment ，里面有一个 recyclerview (GridlayoutManager)。 recyclerview 中的项目并不复杂或有图像，但在向下滚动 recyclerview 时滞后(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。

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();
    }
  }
}

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>

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);
  }
}

日志猫

 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
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09-11 17:48:32.159  31535-31535/com.feserware.learn D/TtRecycler﹕ timetableViewHolder
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09-11 17:48:32.631  31535-31589/com.feserware.learn D/OpenGLRenderer﹕ endAllStagingAnimators on 0xa1b9ed00 (RippleDrawable) with handle 0xa188dfb0
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09-11 17:48:36.498  31535-31535/com.feserware.learn I/Choreographer﹕ Skipped 31 frames!  The application may be doing too much work on its main thread.
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最佳答案

好吧，我不知道你的代码到底出了什么问题，但我能做的是为你提供一个我使用的示例回收程序代码，相信你可以与你的代码进行比较，找出你可能出错的地方，它是一个可扩展的回收器， child 有一个带有图像的水平 ListView ，我没有遇到滞后我使用华为 Y300，那是一个低端手机，我选择那个手机是因为我知道我的代码是否可以很好地工作然后它适用于大多数手机，所以这是我的可扩展回收器适配器的示例，我的代码虽然存在内存使用问题，但在加载大约 20 个项目(每个项目有 5 张图片)后，它会增加到大约 20mb

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;

}

 }

我是怎么用的

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

关于Android Recyclerview 向下滚动时滞后，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32507719/

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