控制回收者视图的甩动速度 [英] control fling speed for recycler view
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问题描述
我有一个RecyclerView，其中有一个图像，有几个TextView s和2个ImageButton s.
我的Activity中有7-8个这样的行要显示.
滚动在android 4.4.4及以下版本中非常平滑，但在棒棒糖中却具有一定的抽动效果.
我认为控制RecyclerView的猛击速度可以解决问题.
我进行了搜索，但一无所获.相反，我发现了如何将视图移至特定位置.
I have a RecyclerView in which i have an image ,a few TextViews and 2 ImageButtons.
I have 7-8 such rows to display in my Activity.
The scroll is very smooth in android 4.4.4 and below versions but it kind of gives some jerking effect in lollipop.
I think that controlling the fling speed for the RecyclerView will do the trick.
I searched for it, but found nothing.Instead i found how to take the view to a particular position for the fling.
但是我想控制逃跑速度.可以使用摩擦力.以及如何使用摩擦力.
But I want to control the fling speed. Can friction be used. And how to use friction.
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);
这是我用来设置rcycler视图布局的适配器.
This is my adapter to set rcycler view layout.
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, parent, false);
return new CustomViewHolder(view, 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, "Please check your internet connection", 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;
}
}
推荐答案
There is one RecyclerView method specifically designed to control the fling speed you only need to override it to achieve the friction/slowdown effect you mentioned in your question.
您可以尝试的一个简单实现:
One simple implementation you could try:
@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);
}
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