Recycler View Laggy on Scroll up and down

Question

所以我在过去的一天看了几百个问题,阅读了所有内容,这就是我收集的内容......

一个人说添加这个:

homeRecyclerView.setHasFixedSize(true);

我试过什么都没做,因为向下或向上滚动的问题是否滞后？二者皆是.

这是一个drawable,我正在使用Picasso(drawable因为我想在进行服务器调用之前测试视图)所以有人说可能缓存系统正在影响它,删除Picasso并且默认情况下imageview有图像但仍然滞后.. .

以下是家庭活动中的声明:

homeRecyclerView = (RecyclerView) findViewById(R.id.home_recycler_view);
            homeRecyclerView.setHasFixedSize(true);
  homeAdapter = new HomeAdapter(this, homeList);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
        homeRecyclerView.setLayoutManager(mLayoutManager);
        homeRecyclerView.setItemAnimator(new DefaultItemAnimator());

        homeRecyclerView.setAdapter(homeAdapter);

  public interface ClickListener {
        void onClick(View view, int position);

        void onLongClick(View view, int position);
    }

    public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {

        private GestureDetector gestureDetector;
        private MainHome.ClickListener clickListener;

        public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final MainHome.ClickListener clickListener) {
            this.clickListener = clickListener;
            gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
                @Override
                public boolean onSingleTapUp(MotionEvent e) {
                    return true;
                }

                @Override
                public void onLongPress(MotionEvent e) {
                    View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
                    if (child != null && clickListener != null) {
                        clickListener.onLongClick(child, recyclerView.getChildPosition(child));
                    }
                }
            });
        }

        @Override
        public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

            View child = rv.findChildViewUnder(e.getX(), e.getY());
            if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
                clickListener.onClick(child, rv.getChildPosition(child));
            }
            return false;
        }

        @Override
        public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        }

        @Override
        public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

        }
    }

这是家用适配器:

public class HomeAdapter extends RecyclerView.Adapter<HomeAdapter.MyViewHolder>{

    private List<items> items;
    private Context context;

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView text;
        public ImageView pic;

        public MyViewHolder(View view) {
            super(view);
           text = (TextView) view.findViewById(R.id.text);

            pic = (ImageView) view.findViewById(R.id.pic);
        }
        }

        public HomeAdapter(Context mContext, List<items> items) {
            context = mContext;
            this.items = items;
        }

        @Override
        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View itemView = LayoutInflater.from(parent.getContext())
                    .inflate(R.layout.home_item, parent, false);

            return new MyViewHolder(itemView);
        }

        @Override
        public void onBindViewHolder(MyViewHolder holder, int position) {

            Typeface myTypeface = Typeface.createFromAsset(context.getAssets(), "font1.ttf");
            Typeface myTypefaceItalic = Typeface.createFromAsset(context.getAssets(), "font2.ttf");
            Typeface myTypefaceBold = Typeface.createFromAsset(context.getAssets(), "font3.ttf");

            Item item = items.get(position);


            holder.text.setTypeface(myTypefaceBold);


Picasso.with(context).load(R.drawable.robot).into(holder.pic);
        }

        @Override
        public int getItemCount() {
            return items.size();
        }


}

任何可以请指出可能导致这种滞后滚动问题或建议的人.我从适配器中的持有人的listview切换到回收者视图听到它更顺畅和更好......但滚动似乎更糟糕...

Answer 1

你的问题是

    Typeface myTypeface = Typeface.createFromAsset(context.getAssets(), "Lato_Regular.ttf");
        Typeface myTypefaceItalic = Typeface.createFromAsset(context.getAssets(), "Lato_Italic.ttf");
        Typeface myTypefaceBold = Typeface.createFromAsset(context.getAssets(), "Lato_Bold.ttf");

您每次在绑定视图中初始化它.createFromAsset需要一些内存和处理能力.每次调用绑定视图时都执行此操作并且您有滚动滞后.

我建议将此代码移动到您的活动中并将其传递给您的回收站视图构造函数.

试试这个,让我知道它是否解决了你的问题.