Question

我正在使用recyclerview显示商品，商品大小可能为0-500。

但是它的滚动性能非常慢，有时会滞后/暂停视图1〜2秒。我想在recyclerView中获得流畅的滚动体验。

即使我从使用Glide加载的Cardview布局中删除图像，也不会影响性能。

fragment_home.xml

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/layoutGames">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recyclerViewGamesToday"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scrollbars="vertical"
            android:scrollbarThumbVertical="@android:color/darker_gray"
            android:scrollbarSize="5dp"/>
    </LinearLayout>

我的Cardview布局文件

<?xml version="1.0" encoding="utf-8"?>
<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="wrap_content"
    android:orientation="vertical">

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">


        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:minHeight="35dp">


            <ImageView
                android:id="@+id/imageTeamLogo"
                android:layout_width="20dp"
                android:layout_height="20dp"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:srcCompat="@drawable/transparent" />

            <TextView
                android:id="@+id/textViewHomeTeam"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_centerInParent="false"
                android:layout_centerVertical="true"
                android:layout_marginEnd="2dp"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:layout_marginStart="2dp"
                android:gravity="right"
                android:text="TextView"
                android:textColor="@color/colorTeamNameListing"
                android:textSize="12sp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/imageViewTeamLogo"
                app:layout_constraintHorizontal_chainStyle="packed"
                app:layout_constraintStart_toEndOf="@+id/imageTeamLogo"
                app:layout_constraintTop_toTopOf="parent" />

            <ImageView
                android:id="@+id/imageViewTeamLogo"
                android:layout_width="25dp"
                android:layout_height="25dp"
                android:layout_centerInParent="false"
                android:layout_centerVertical="true"

                android:layout_marginEnd="2dp"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:layout_marginStart="2dp"
                android:padding="4dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/textViewMatchStatus"
                app:layout_constraintHorizontal_bias="0.5"
                app:layout_constraintStart_toEndOf="@+id/textViewHomeTeam"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/textViewScore"
                android:layout_width="0dp"
                android:layout_height="15dp"
                android:layout_centerInParent="false"
                android:layout_marginTop="2dp"
                android:gravity="center_vertical|center"
                android:text="3-1"
                android:textColor="@color/colorScoreListing"
                android:textSize="13sp"
                android:textStyle="bold"
                app:layout_constraintEnd_toEndOf="@+id/textViewMatchStatus"
                app:layout_constraintHorizontal_bias="0.5"
                app:layout_constraintStart_toStartOf="@+id/textViewMatchStatus"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/textViewMatchStatus"
                android:layout_width="70dp"
                android:layout_height="15dp"
                android:layout_below="@+id/textViewStatus"
                android:layout_centerInParent="false"

                android:layout_marginBottom="2dp"
                android:gravity="center_vertical|center"
                android:text="Not Started"
                android:textColor="@color/colorMatchStatus"
                android:textSize="10sp"
                android:textStyle="bold"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.5"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/textViewScore" />

            <ImageView
                android:id="@+id/imageViewAwayTeamLogo"
                android:layout_width="25dp"
                android:layout_height="25dp"
                android:layout_centerInParent="false"
                android:layout_centerVertical="true"

                android:layout_marginEnd="2dp"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:layout_marginStart="2dp"
                android:padding="4dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/textViewAwayTeam"
                app:layout_constraintHorizontal_bias="0.5"
                app:layout_constraintStart_toEndOf="@+id/textViewMatchStatus"
                app:layout_constraintTop_toTopOf="parent" />

            <TextView
                android:id="@+id/textViewAwayTeam"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_alignParentEnd="true"
                android:layout_alignParentTop="true"
                android:layout_marginEnd="2dp"
                android:layout_marginLeft="2dp"
                android:layout_marginRight="2dp"
                android:layout_marginStart="2dp"
                android:gravity="left"
                android:text="TextView"
                android:textColor="@color/colorTeamNameListing"
                android:textSize="12sp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/imageViewFav"
                app:layout_constraintStart_toEndOf="@+id/imageViewAwayTeamLogo"
                app:layout_constraintTop_toTopOf="parent" />

            <ImageView
                android:id="@+id/imageViewFav"
                android:layout_width="20dp"
                android:layout_height="20dp"
                android:layout_marginEnd="8dp"
                android:layout_marginRight="8dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:srcCompat="@drawable/star" />

        </android.support.constraint.ConstraintLayout>
        <View
            android:layout_width="match_parent"
            android:background="#efefef"
            android:layout_height="1dp" />
    </android.support.v7.widget.CardView>
</LinearLayout>

我的适配器校准中的onBindViewHolder方法

@Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        final GamesToday games = gamesTodayList.get(position);
        switch (holder.getItemViewType()) {

            case gamesOnlyRows:
                final GamesTodayViewHolder gamesTodayViewHolder = (GamesTodayViewHolder) holder;
                Glide.with(mCtx)
                        .load(games.getHomeTeamLogo())
                        .apply(options)
                        .into(gamesTodayViewHolder.imageViewHomeTeamLogo);
                Glide.with(mCtx)
                        .load(games.getAwayTeamLogo())
                        .apply(options)
                        .into(gamesTodayViewHolder.imageViewAwayTeamLogo);

                gamesTodayViewHolder.textViewHomeTeam.setText(games.getHomeName());
                if (games.getHomeScore().equals("null")) {
                    gamesTodayViewHolder.textViewScore.setText(games.getDate());
                } else {
                    gamesTodayViewHolder.textViewScore.setText(games.getHomeScore() + " - " + games.getAwayScore());
                }

                gamesTodayViewHolder.imageViewEmptyCircle.setImageResource(R.drawable.transparent);
                if (games.getStatus().equals("CLOSED")) {
                    gamesTodayViewHolder.imageViewEmptyCircle.setImageResource(R.drawable.ft);
                }
                if (games.getStatus().equals("ACTIVE")) {
                    gamesTodayViewHolder.imageViewEmptyCircle.setImageResource(R.drawable.active_icon);
                }

                switch (games.getStatus()) {
                    case "CLOSED":
                        gamesTodayViewHolder.textViewMatchStatus.setText("Finished");
                        break;

                    case "FINISHED_CONFIRMED_1":
                        gamesTodayViewHolder.textViewMatchStatus.setText("Finished");
                        break;

                    case "FINISHED_CONFIRMED_2":
                        gamesTodayViewHolder.textViewMatchStatus.setText("Finished");
                        break;

                    case "NOT_STARTED":
                        gamesTodayViewHolder.textViewMatchStatus.setText("Not Started");
                        break;
                    case "ACTIVE":
                        gamesTodayViewHolder.textViewMatchStatus.setText("Active");
                        break;
                    case "CANCELLED":
                        gamesTodayViewHolder.textViewMatchStatus.setText("Cancelled");
                        break;

                    case "POSTPONED_UNDECIDED":
                        gamesTodayViewHolder.textViewMatchStatus.setText("Postponed");
                        break;

                    default:
                        gamesTodayViewHolder.textViewMatchStatus.setText(games.getStatus());
                }

                gamesTodayViewHolder.textViewAwayTeam.setText(games.getAwayName());
                gamesTodayViewHolder.imageViewFav.setImageResource(R.drawable.star);
                if (checkFavoriteItem(games.getId())) {
                    gamesTodayViewHolder.imageViewFav.setImageResource(R.drawable.fav);
                }

                gamesTodayViewHolder.imageViewFav.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (checkFavoriteItem(games.getId())) {
                            gamesTodayViewHolder.imageViewFav.setImageResource(R.drawable.star);
                            sharedPreference.removeFavorite(mCtx, games.getId());
                        } else {
                            gamesTodayViewHolder.imageViewFav.setImageResource(R.drawable.fav);
                            sharedPreference.addFavorite(mCtx, games.getId());
                        }
                    }
                });
                break;

            case NotGamesOnlyRows:
                final GamesTodayWithLeagueViewHolder gamesTodayWithLeagueViewHolder = (GamesTodayWithLeagueViewHolder) holder;
                gamesTodayWithLeagueViewHolder.imageViewFavLeague.setImageResource(R.drawable.transparent);
                gamesTodayWithLeagueViewHolder.imageViewFavLeague.setImageResource(R.drawable.star);

                if (checkFavoriteLeagueItem(games.getLeagueId())) {
                    gamesTodayWithLeagueViewHolder.imageViewFavLeague.setImageResource(R.drawable.fav);
                } else {
                    gamesTodayWithLeagueViewHolder.imageViewFavLeague.setImageResource(R.drawable.transparent);
                    gamesTodayWithLeagueViewHolder.imageViewFavLeague.setImageResource(R.drawable.star);
                }
                gamesTodayWithLeagueViewHolder.imageViewFavLeague.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (checkFavoriteLeagueItem(games.getLeagueId())) {
                            gamesTodayWithLeagueViewHolder.imageViewFavLeague.setImageResource(R.drawable.star);
                            sharedPreference.removeFavoriteLeagues(mCtx, games.getLeagueId());
                        } else {
                            gamesTodayWithLeagueViewHolder.imageViewFavLeague.setImageResource(R.drawable.fav);
                            sharedPreference.addFavoriteLeagues(mCtx, games.getLeagueId());
                        }
                    }
                });
                gamesTodayWithLeagueViewHolder.textViewLeagueName.setText(games.getLeague());
                Glide.with(mCtx)
                        .load(games.getCountryId())
                        .into(gamesTodayWithLeagueViewHolder.imageViewCountryFlag);
                break;

            default:
        }
    }

Answer 1

它将按需加载对我有用的图像

 @Override
 public void onViewAttachedToWindow(@NonNull RecyclerView.ViewHolder holder) {
    super.onViewAttachedToWindow(holder);
    Glide.with(context)
         .load(URL)
         .into(holder.imageView);
}

Answer 2

我认为bindViewHolder中的逻辑使其变得更慢，因为在滚动bindViewHolder时，将为每个将要显示的项目调用它。

此外，您可以合并逻辑

if (games.getStatus().equals("CLOSED")) {

   gamesTodayViewHolder.imageViewEmptyCircle.setImageResource(R.drawable.ft);
            }
if (games.getStatus().equals("ACTIVE")) {
                gamesTodayViewHolder.imageViewEmptyCircle.setImageResource(R.drawable.active_icon);
            }

与下一个开关盒...

此外，不要在bindview中设置点击监听器，这不好...您可以在该Holder类中设置

Answer 3

使用这些替代方法进行平滑滚动

a) recyclerView.setHasFixedSize(true);
b) recyclerView.setItemViewCacheSize(20);
recyclerView.setDrawingCacheEnabled(true);
recyclerView.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);

c）在onBindView()中它将提供内存管理缓存以减少图像加载时间

Glide.with(mCtx).load(games.getAwayTeamLogo()).
                        .diskCacheStrategy(DiskCacheStrategy.ALL)
                        .apply(options)
                        .into(gamesTodayViewHolder.imageViewAwayTeamLogo);

Answer 4

请勿使用ConstraintLayout，而应使用LinearLayout和/或RelativeLayout。

尝试一下，看看性能变化。

RecyclerView的滚动性能较慢，滚动时有时会停滞/停滞

4 个答案: