android – 控制回收者视图的投掷速度

我有一个RecyclerView,其中我有一个图像,一些TextViews和2个 ImageButtons.
我有7-8个这样的行显示在我的Activity中.
在 Android 4.4.4及以下版本中滚动非常流畅,但它在棒棒糖中提供了一些抽搐效果.
我认为控制RecyclerView的速度可以解决问题.
我搜索了它,却一无所获.相反,我发现如何将视图移动到特定的位置进行投掷.

但我想控制投掷速度.可以使用摩擦力.以及如何使用摩擦力.

menuRecyclerView = (RecyclerView) findViewById(R.id.menuList);
menuRecyclerView.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(context);
menuRecyclerView.setLayoutManager(llm);     
Scroller sc = new Scroller(context);
sc.setFriction(ViewConfiguration.getScrollFriction() * 10);

这是我设置rcycler视图布局的适配器.

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.bumptech.glide.Glide;

import news.circle.circle.R;

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.CustomViewHolder> {
    public RecyclerViewAdapter(Context context,List<MenuDescription> listOrder,DatabaseHandlerCart db,List<MenuDescription> vegList,List<MenuDescription> nonVegList,String menuTextData) {
        this.listOrder = listOrder;
        this.inflater = LayoutInflater.from(context);
        this.context = context;
        imageLoader = new ImageLoader(context);
        this.db = db;
        this.vegList = vegList;
        this.nonVegList = nonVegList;
        this.completeList = listOrder;
        this.menuTextData = menuTextData;
    }

    @Override
    public RecyclerViewAdapter.CustomViewHolder onCreateViewHolder(ViewGroup parent,int viewType) {
        if (viewType == TYPE_ITEM) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_view,parent,false);
            return new CustomViewHolder(view,viewType);
        } else if (viewType == TYPE_HEADER) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.header,viewType);
        }
        return null;
    }

    @Override
    public void onBindViewHolder(final RecyclerViewAdapter.CustomViewHolder holder,int position) {
        if (holder.Holderid == 1) {
            final MenuDescription menu = listOrder.get(position - 1);
            holder.title.setText(menu.getName() + "");
            holder.quant.setText(menu.getQuantity() + "");
            holder.description.setText(menu.getDescription());
            holder.title.setTypeface(Fonts.getFont(context,Constants.AVENIR_REGULAR));
            holder.description.setTypeface(Fonts.getFont(context,Constants.AVENIR_REGULAR));
            Glide.with(context).load(menu.getFlag_path()).placeholder(R.drawable.ic_order_now).fitCenter().into(holder.image);
            holder.inc.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if (Constants.internet) {
                        menu.decrQuantity();
                        if (menu.getQuantity() == 0) {
                            menu.setDecr_button_visibility(0);
                            try {
                                db.DeleteCartItem(menu.getItem_id());
                            } catch (SQLException e) {
                                e.printStackTrace();
                            }
                        } else {
                            try {
                                db.updateQuantity(menu.getQuantity(),menu.getItem_id());
                            } catch (SQLException e) {
                                e.printStackTrace();
                            }
                        }
                        holder.quant.setText(menu.getQuantity() + "");
                        notifyDataSetChanged();
                    } else {
                        Toast.makeText(context,"Please check your internet connection",Toast.LENGTH_SHORT).
                    }
                    show();
                }
            });
            holder.decr.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (Constants.internet) {
                        try {
                            if (!db.CheckIsItemAlreadyInDBorNot(menu.getItem_id(),"cart")) {
                                menu.incrQuantity();
                                db.addDataToCart(menu);
                                // cart_items.add(menu);

                                holder.quant.setText(menu.getQuantity() + "");
                            } else {
                                menu.incrQuantity();
                                db.updateQuantity(menu.getQuantity(),menu.getItem_id());
                                holder.quant.setText(menu.getQuantity() + "");
                            }

                        } catch (SQLException | IllegalStateException e) {
                            e.printStackTrace();
                        }


                        if (menu.getDecr_button_visibility() == 1) {
                            holder.decr.setVisibility(View.VISIBLE);
                            holder.quant.setVisibility(View.VISIBLE);
                            if (total == 1)
                                RecyclerViewMainActivity.bottomBarUp();

                            notifyDataSetChanged();
                        } else
                            Toast.makeText(context,Toast.LENGTH_SHORT).show();
                    }
                }
            });
        }
    }

    @Override
    public int getItemCount() {
        return (null != listOrder ? listOrder.size() + 1 : 0);
    }

    @Override
    public int getItemViewType(int position) {
        if (isPositionHeader(position))
            return TYPE_HEADER;
        return TYPE_ITEM;
    }

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
    }

    private boolean isPositionHeader(int position) {
        return position == 0;
    }
}

解决方法

有一种专门针对 control the fling speed设计的RecyclerView方法,您只需要覆盖它以实现您在问题中提到的摩擦/减速效果.

您可以尝试一个简单的实现：

@Override
public boolean fling(int velocityX,int velocityY)
{

     // if FLING_SPEED_FACTOR between [0,1[ => slowdown 
     velocityY *= FLING_SPEED_FACTOR; 

     return super.fling(velocityX,velocityY);
}