[英]lost chosen items in android recycler view when swiping down or top
我制作了一個回收站視圖來顯示和選擇 Instagram 帖子,在回收站視圖適配器中我處理了 onclick 以向用戶顯示是否選擇了項目並處理所選帖子的總和......但是當適配器中的 insta 帖子超過 12 時出現問題當我在頁面中滾動時,一些選擇的項目顯示為未選擇,而一些未選擇的帖子看起來像您選擇了它們?:! 誰能幫我 ? 這是我的適配器:
package com.example.pinstagram.adaptor;
import android.content.Context;
import android.os.Build;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.pinstagram.R;
import com.example.pinstagram.classes.BuyBasketFlow;
import com.example.pinstagram.classes.InstaPosts;
import com.example.pinstagram.classes.SellingItems;
import com.example.pinstagram.viewHolders.InstaPostsRecyclerViewHolders;
import com.squareup.picasso.Picasso;
import java.util.ArrayList;
import java.util.List;
public class InstaPostsRecyclerViewAdapter extends RecyclerView.Adapter<InstaPostsRecyclerViewHolders> {
private List<InstaPosts> instaList;
private List<InstaPosts> selectedPosts;
LinearLayout linearLayout;
private Context context;
TextView numberTextView,eachPostPriceTxt,totalPriceTxt;
BuyBasketFlow buyBasketFlow;
SellingItems sellingItems;
public InstaPostsRecyclerViewAdapter(Context context, List<InstaPosts> itemList,List<InstaPosts> selectedPosts,LinearLayout linearLayout,TextView[] textViews) {
this.instaList = itemList;
this.context = context;
this.selectedPosts = selectedPosts;
this.linearLayout = linearLayout;
numberTextView = textViews[0];
eachPostPriceTxt = textViews [1];
buyBasketFlow = new BuyBasketFlow();
sellingItems = new SellingItems();
selectedPosts.clear();
for(int i = 0; i < instaList.size();i++){
instaList.get(i).setSelected(false);
}
linearLayout.setVisibility(View.GONE);
}
@NonNull
@Override
public InstaPostsRecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) {
View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.isnta_posts_listview, null);
InstaPostsRecyclerViewHolders crcv = new InstaPostsRecyclerViewHolders(layoutView);
return crcv;
}
@Override
public void onBindViewHolder(@NonNull final InstaPostsRecyclerViewHolders holder, final int position) {
holder.cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.i("Log3", " item number: " + position + " is clicked");
instaList.get(position).setSelected(!instaList.get(position).isSelected());
if(buyBasketFlow.getType().compareTo("like")==0) {
if (instaList.get(position).isCanBeSelect()) {
selectingPhase(holder,position);
} else {
Toast.makeText(context, R.string.just_select_photo, Toast.LENGTH_SHORT).show();
Log.i("Log1", instaList.get(position).getTypename());
}
}else if(buyBasketFlow.getType().compareTo("view")==0){
if (instaList.get(position).isViewCanBeSelected()) {
selectingPhase(holder,position);
} else {
Toast.makeText(context, R.string.just_select_video, Toast.LENGTH_SHORT).show();
Log.i("Log1", instaList.get(position).getTypename());
}
}else if(buyBasketFlow.getType().compareTo("comment")==0){
if (instaList.get(position).isViewCanBeSelected()||instaList.get(position).isCanBeSelect()) {
selectingPhase(holder,position);
} else {
Toast.makeText(context, R.string.just_select_video, Toast.LENGTH_SHORT).show();
Log.i("Log1", instaList.get(position).getTypename());
}
}
}
});
Picasso.get().load(instaList.get(position).getThumbnail_url()).into(holder.instaImage);
}
public List<InstaPosts> getSelectedPosts(){
return selectedPosts;
}
@Override
public int getItemCount() {
return this.instaList.size();
}
private void selectingPhase(InstaPostsRecyclerViewHolders holder,int position){
if (instaList.get(position).isSelected()) {
selectedPosts.add(instaList.get(position));
buyBasketFlow.setPostsArrays(selectedPosts);
for (InstaPosts selected : selectedPosts) {
Log.e("Log1", selected.toString());
}
holder.radioBtn.setImageDrawable(context.getDrawable(R.drawable.radio_button_checked));
holder.cardView.setStrokeWidth(10);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
holder.cardView.setStrokeColor(context.getColor(R.color.colorPrimary));
}
} else {
selectedPosts.remove(instaList.get(position));
buyBasketFlow.setPostsArrays(selectedPosts);
for (InstaPosts selected : selectedPosts) {
Log.e("Log1", selected.toString());
}
holder.cardView.setStrokeWidth(0);
holder.radioBtn.setImageDrawable(context.getDrawable(R.drawable.radio_button_unchecked));
}
if (selectedPosts.size() < 1) {
linearLayout.setVisibility(View.GONE);
Log.i("Log1", "layout must become invisible");
} else {
Log.i("Log1", "layout must become visible");
linearLayout.setVisibility(View.VISIBLE);
sellingItems = buyBasketFlow.getSellingItem();
numberTextView.setText("" + selectedPosts.size());
Log.i("Log1", "" + Integer.parseInt(sellingItems.getPrice()));
String text = "قیمت هر پست" + sellingItems.getPrice() + " تومان ";
String sum = Integer.toString((selectedPosts.size() * Integer.parseInt(sellingItems.getPrice())));
text = text + "و قیمت مجموع " + sum + " تومان ";
eachPostPriceTxt.setText(text);
}
}
}
每次都需要在 onBindViewHolder 上設置選中的 state。
在 onBindViewHolder 中:
InstaPosts instaPosts = instaList.get(position);
holder.cardView.setStrokeWidth(instaPosts.isSelected() ? 10 : 0);
holder.radioBtn.setImageDrawable(context.getDrawable(instaPosts.isSelected() ? R.drawable.radio_button_checked : R.drawable.radio_button_unchecked));
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