Question

我的应用程序的MainActivity类由ViewPager和大约10个选项卡组成。在每个选项卡中，我使用android RecyclerView加载ListItem。用户在ViewPager中左右滑动时会出现此问题。调试后，我发现我的CustomListAdapter中出现了问题。

我发现如果我在onCreateViewHolder中增加Layout Inflater的数量，滞后会增加。

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    RecyclerView.ViewHolder viewHolder;

    // performance hit
    View itemView = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.list_row, parent, false);
    View itemViewlast = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.list_row_last, parent, false);
    View itemViewdefault = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.list_row_default, parent, false);

    switch (viewType) {
        case 0:
            viewHolder = new MyViewHolder(itemView);
            break;
        case 3:
            viewHolder = new MyViewHolder(itemViewlast);
            break;
        default:
            viewHolder = new MyViewHolder(itemView1);
            break;
    }

    return viewHolder;
}

为了减少我在开关盒本身内部移动了LayoutInflater。

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    RecyclerView.ViewHolder viewHolder;

    switch (viewType) {
        case 0:
            // moved here
            View itemView = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.list_row, parent, false);
            viewHolder = new MyViewHolder(itemView);
            break;
        case 3:
            // moved here
            View itemViewlast = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.list_row_last, parent, false);
            viewHolder = new MyViewHolder(itemViewlast);
            break;
        default:
            // moved here
            View itemViewdefault = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.list_row_default, parent, false);
            viewHolder = new MyViewHolder(itemView1);
            break;
    }

    return viewHolder;
}

现在我还是觉得还有一些滞后。所以我的问题是，有没有办法减少这种滞后或在onCreateViewHolder方法之外移动Layout Inflater？

MyViewHolder方法：

public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView title, rating, genre,detailmovie,movieName,movieTime;
        public ImageView thumbNail, movieNail;
        public MyViewHolder(View view) {
            super(view);
            title = (TextView) view.findViewById(R.id.title);
            rating = (TextView) view.findViewById(R.id.rating);
            genre = (TextView) view.findViewById(R.id.genre);
            detailmovie = (TextView) view.findViewById(R.id.detailmovie);
            movieName = (TextView) view.findViewById(R.id.movieName);
            movieTime = (TextView) view.findViewById(R.id.movieTime);
            thumbNail = (ImageView) view.findViewById(R.id.thumbnail);
            movieNail = (ImageView) view.findViewById(R.id.movieThumbnail);
        }
    }

@Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {

        switch (viewHolder.getItemViewType()) {
            case 0:
                MyViewHolder vh1 = (MyViewHolder) viewHolder;
                configureViewHolder1(vh1, position);
                break;
            case 3:
                MyViewHolder vh3 = (MyViewHolder) viewHolder;
                configureViewHolder1(vh3, position);
                break;
            default:
                MyViewHolder vh4 = (MyViewHolder) viewHolder;
                configureViewHolder1(vh4, position);
                break;
        }
    }

private void configureViewHolder1(MyViewHolder vh1, int position) {

    final Movie movie = movieItems.get(position);

    vh1.title.setText(movie.getTitle());
    vh1.rating.setText("Rating: " + String.valueOf(movie.getRating()));

    Glide.with(activity).
        load(Uri.parse(movie.getThumbnailUrl())).
        crossFade().
        placeholder(R.drawable.placeholder).diskCacheStrategy(DiskCacheStrategy.SOURCE).
        dontTransform().
        into(vh1.thumbNail);

    vh1.movieDetail.setText(String.valueOf(movie.movieDetail()));
    vh1.movieName.setText(String.valueOf(movie.getmovieName()));
    vh1.movieTime.setText(String.valueOf(movie.getmovieTime()));

    vh1.itemView.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
            fragmentJump(movie);
        }
    });
}

Answer 1

尝试使用默认的caching strategy for glide（DiskCacheStrategy.RESULT），它将生成的图像存储在缓存中，而不是存储完整的图像。通过这样做，您可以减少对图像的变换量（减少处理次数 - >减少丢帧次数的机会）。

自定义RecyclerView适配器在viewpager中使用时产生严重延迟

1 个答案: