RecyclerView 延迟滚动 [英] RecyclerView laggy scrolling
问题描述
我正在 RecyclerView 中加载 400x200 的图像,但在 2k 设备上滚动延迟.我正在使用 Picasso 从资源加载图像.
I am loading 400x200 images in RecyclerView, but scrolling is laggy on 2k devices. I am using Picasso for loading images from resource.
正如您在演示中看到的,2k 屏幕上的图像很模糊,但如果我加载更高分辨率的图像,情况会变得更糟.如何解决这个问题,我什至没有加载大图像,它的 400x200 ?
As you can see in the demo images are blurry on 2k screen, but if I load higher resolution images the situation gets worse. How to fix this, I am not even loading large image, its 400x200 ?
这是我的代码card_view.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_view"
card_view:cardPreventCornerOverlap="false"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
card_view:cardCornerRadius="2dp">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/rel">
<ImageView
android:id="@+id/cardimage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="@drawable/p7"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="title"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
android:paddingBottom="24dp"
android:textStyle="bold"
android:textSize="24sp"
android:id="@+id/cardtitle"
android:layout_gravity="center_vertical"/>
</LinearLayout>
</android.support.v7.widget.CardView>
Myadapter 代码
Myadapter Code
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
private Context mContext;
List<Flower> list = new ArrayList<>();
public CardAdapter(Context mContext, List<Flower> list) {
this.mContext = mContext;
this.list = list;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_view, parent, false);
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.Flower=getItem(position);
holder.cardtitle.setText(list.get(position).name);
Picasso.with(mContext)
.load(list.get(position).id)
.placeholder(R.drawable.ic_launcher)
.into(holder.cardimage);
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
@Override
public int getItemCount() {
return list.size();
}
public Flower getItem(int i) {
return list.get(i);
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView cardimage;
TextView cardtitle;
Flower Flower;
public ViewHolder(View itemView) {
super(itemView);
cardimage = (ImageView) itemView.findViewById(R.id.cardimage);
cardtitle = (TextView) itemView.findViewById(R.id.cardtitle);
}
}
}
更新:我正在从资源加载图像,我没有下载任何东西
UPDATE: I am loading images from resource, I am not downloading nothing
这是我的数组
private void initializeData() {
flowers = new ArrayList<>();
flowers.add(new Flower("Flower 1", R.drawable.p8));
flowers.add(new Flower("Flower 2", R.drawable.p10));
flowers.add(new Flower("Flower 3", R.drawable.p11));
flowers.add(new Flower("Flower 4", R.drawable.p8));
flowers.add(new Flower("Flower 5", R.drawable.photo2));
flowers.add(new Flower("Flower 6", R.drawable.photo6));
flowers.add(new Flower("Flower 7", R.drawable.p12));
flowers.add(new Flower("Flower 8", R.drawable.p9));
flowers.add(new Flower("Flower 9", R.drawable.p8));
flowers.add(new Flower("Flower 10", R.drawable.p8));
flowers.add(new Flower("Flower 11", R.drawable.p8));
flowers.add(new Flower("Flower 12", R.drawable.p10));
}
更新 2:伙计们,我通过设置 adapter.setHasStableIds(true) 修复了大部分延迟,但应用程序在第一次滚动时仍然滞后,而图像尚未加载,如何解决?
UPDATE 2 : Guys I fixed most of the lag by setting adapter.setHasStableIds(true) , but app is still laggy on the first scroll while images are not loaded yet, how to fix that ?
更新 3:我刚刚尝试从 Web 加载图像,一切看起来都很顺利,可能是从资源加载图像存在一些问题.
UPDATE 3: I just tried loading images from web and everything seems smooth, probably there is some problem with loading images from resource .
好的,谢谢你们,我要从网上加载我的图片.
Ok, thank you guys, I am gonna load my images from web.
推荐答案
如果您使用两个或多个回收器视图,例如(RecyclerView 和 NestedView)试试这个
if you are using two or more recycler views like (RecyclerView and NestedView) try this
recyclerView.setNestedScrollingEnabled(false);
来源:嵌套滚动视图中的 Recyclerview 滚动但不像普通 Recyclerview 或嵌套滚动视图那样快速滚动
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