在这里，我有两个具有 parentRecyclerViewAdapter 和 childRecyclerViewAdapter 的recyclerview。父适配器具有 LinearLayoutManager.VERTICAL 布局管理器，而Clild适配器具有带有itemDecoration的 GridLayoutManager（mContext，2）布局管理器。
第一次滚动时，RecyclerView滚动是滞后的，一旦查看数据，滚动就会很平滑。在应用程序实例未被完全删除之前，滚动将是平滑的，并且当应用重新启动时，滚动再次延迟。
请帮我弄清楚这个BUG !!
ParentRecyclerViewAdapter
public class RecyclerViewDataAdapter extends RecyclerView.Adapter<RecyclerViewDataAdapter.ItemRowHolder> {
private ArrayList<SectionDataModel> dataList;
private Context mContext;
private RecyclerListItemClick onListClick;
public RecyclerViewDataAdapter(Context context, ArrayList<SectionDataModel> dataList) {
this.dataList = dataList;
this.mContext = context;
onListClick = (RecyclerListItemClick) context;
}
@Override
public ItemRowHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
return new ItemRowHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.single_row_template_section, null));
}
@Override
public void onBindViewHolder(ItemRowHolder itemRowHolder, int i) {
ArrayList<SingleTemplateModel> templateModelArrayList = dataList.get(i).getTemplateModelArrayList();
String sectionName = dataList.get(i).getHeaderTitle();
itemRowHolder.itemTitle.setText(sectionName);
TemplateChooserAdapter itemListDataAdapter = new TemplateChooserAdapter(mContext, templateModelArrayList , dataList.get(i).getHeaderTitle());
itemRowHolder.recycler_view_list.setAdapter(itemListDataAdapter);
}
@Override
public int getItemCount() {
return (null != dataList ? dataList.size() : 0);
}
public class ItemRowHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView itemTitle;
private RecyclerView recycler_view_list;
private ItemRowHolder(View view) {
super(view);
this.itemTitle = view.findViewById(R.id.itemTitle);
this.recycler_view_list = view.findViewById(R.id.recycler_view_list);
this.recycler_view_list.setOnClickListener(this);
this.recycler_view_list.setHasFixedSize(true);
this.recycler_view_list.setLayoutManager(new GridLayoutManager(mContext, 2));
this.recycler_view_list.addItemDecoration(new SpacesItemDecoration(2 , 25 , false));
}
@Override
public void onClick(View v) {
onListClick.onRecyclerItemClicked(dataList.get(getAdapterPosition()).getHeaderTitle());
}
}
}
ChildRecyclerAdapter
public class TemplateChooserAdapter extends RecyclerView.Adapter<TemplateChooserAdapter.ViewHolder> {
private static final String TAG = TemplateChooserAdapter.class.getSimpleName();
private Context context;
private ArrayList<SingleTemplateModel> templateModelArrayList;
private OnTemplatesListClicked onListClick;
public TemplateChooserAdapter(Context context, ArrayList<SingleTemplateModel> templateModelArrayList, String sectionName) {
this.context = context;
this.templateModelArrayList = templateModelArrayList;
onListClick = (OnTemplatesListClicked) context;
AppUtils.showLog(TAG, "CorporateUserAdapter");
}
@Override
public TemplateChooserAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new ViewHolder(
LayoutInflater.from(parent.getContext()).inflate(R.layout.single_row_template_chooser, parent, false)
);
}
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
holder.templateView.setImageResource(templateModelArrayList.get(position).getImage());
}
@Override
public int getItemCount() {
return templateModelArrayList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
ImageView templateView;
public ViewHolder(View itemView) {
super(itemView);
templateView = itemView.findViewById(R.id.template_view);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
templateModelArrayList.get(getAdapterPosition()).setShowIndicator(true);
onListClick.onTemplateClick(templateModelArrayList.get(getAdapterPosition())); // TODO send model when item clicked
}
}
}
Activity.java
private void recyclerViewJob() {
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
RecyclerViewDataAdapter adapter = new RecyclerViewDataAdapter(this, allSampleData);
recyclerView.setAdapter(adapter);
}
SectionDataModel.java
public class SectionDataModel {
private String headerTitle;
private ArrayList<SingleTemplateModel> templateModelArrayList;
public SectionDataModel() {
}
public SectionDataModel(String headerTitle, ArrayList<SingleTemplateModel> templateModelArrayList) {
this.headerTitle = headerTitle;
this.templateModelArrayList = templateModelArrayList;
}
public String getHeaderTitle() {
return headerTitle;
}
public void setHeaderTitle(String headerTitle) {
this.headerTitle = headerTitle;
}
public ArrayList<SingleTemplateModel> getTemplateModelArrayList() {
return templateModelArrayList;
}
public void setTemplateModelArrayList(ArrayList<SingleTemplateModel> templateModelArrayList) {
this.templateModelArrayList = templateModelArrayList;
}
}
SingleTemplateModel.java
public class SingleTemplateModel {
private String title;
private String skuName;
private int image;
private boolean showIndicator;
public SingleTemplateModel(String title, String skuName, int image, boolean showIndicator) {
this.title = title;
this.skuName = skuName;
this.image = image;
this.showIndicator = showIndicator;
}
public String getSkuName() {
return skuName;
}
public void setSkuName(String skuName) {
this.skuName = skuName;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getImage() {
return image;
}
public void setImage(int image) {
this.image = image;
}
public boolean isShowIndicator() {
return showIndicator;
}
public void setShowIndicator(boolean showIndicator) {
this.showIndicator = showIndicator;
}
}
single_row_template_section.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingTop="30dp"
android:clickable="true"
android:focusable="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/itemTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_gravity="center_vertical"
android:text="Sample title"
android:textColor="@color/white"
android:textSize="20sp"
android:textStyle="bold"
android:paddingLeft="5dp"
android:paddingBottom="10dp"/>
</RelativeLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:orientation="horizontal" />
</LinearLayout>
single_row_template_chooser.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:layout_width="match_parent"
android:layout_height="280dp"
card_view:cardElevation="6dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/template_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="@mipmap/model_9" />
</RelativeLayout>
</android.support.v7.widget.CardView>
答案 0 :(得分：0)
我认为您可以尝试从资源中延迟加载图像。有Picasso或Glide等图书馆可以帮助您。
所以看起来像这样：
毕加索：
import com.squareup.picasso.Picasso;
...
public class TemplateChooserAdapter extends RecyclerView.Adapter<TemplateChooserAdapter.ViewHolder> {
...
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
Picasso.with(holder.itemView.getContext()).load(templateModelArrayList.get(position).getImage()).into(holder.templateView);
}
...
}