Question

以下是我的代码。

holder.followDiseaseCheckBox.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
        @Override
        public void onClick(View view) {

            if (holder.followDiseaseCheckBox.isChecked()) {

                holder.followDiseaseCheckBox.setChecked(true);

                checkBoxClicked++;
                holder.followDiseaseCheckBox.setChecked(true);
                // for Follow.
                if (isFollowOrUnFollow.equals("FOLLOW")) {

                    ((FollowActivity) context).diseaseListFromAdapter.add(String.valueOf(diseaseMap.get("id")));
                    ((FollowActivity) context).setFollowButton(true);

                }
                // for Unfollow.
                else if (isFollowOrUnFollow.equals("UN_FOLLOW")) {

                    ((FollowTwoActivity) context).unFollowedDiseaseListFromAdapter.add(String.valueOf(diseaseMap.get("id")));
                    ((FollowTwoActivity) context).setUnFollowDiseaseButton(true);
                }


            } else {

                holder.followDiseaseCheckBox.setChecked(false);

                checkBoxClicked--;
                holder.followDiseaseCheckBox.setChecked(false);
                // for Follow.
                if (isFollowOrUnFollow.equals("FOLLOW")) {
                    ((FollowActivity) context).diseaseListFromAdapter.remove(String.valueOf(diseaseMap.get("id")));
                }
                // for Unfollow.
                else if (isFollowOrUnFollow.equals("UN_FOLLOW")) {
                    ((FollowTwoActivity) context).unFollowedDiseaseListFromAdapter.remove(String.valueOf(diseaseMap.get("id")));
                }

                if (checkBoxClicked == 0) {

                    // for Follow.
                    if (isFollowOrUnFollow.equals("FOLLOW")) {
                        ((FollowActivity) context).setFollowButton(false);
                        ((FollowActivity) context).diseaseListFromAdapter.clear();
                    }
                    // for Unfollow.
                    else if (isFollowOrUnFollow.equals("UN_FOLLOW")) {

                        ((FollowTwoActivity) context).setUnFollowDiseaseButton(false);
                        ((FollowTwoActivity) context).unFollowedDiseaseListFromAdapter.clear();
                    }
                }
            }

        }
    });

问题是当我选择包含checkBox checkBox checkBox RecyclerView的{{1}}时，我会选中adapter。但是当我签入checkBox时，项目已正确添加，但checkBox选项正在重复。

例如：如果我检查了第一项checkBox并向下滚动第16项checkBox也会被检查。取消选中$(".cross").hide(); $(".mobilemenu").hide(); $(".hamburger").click(function() { $(".mobilemenu").slideToggle("slow", function() { $(".hamburger").hide(); $(".cross").show(); }); }); $(".cross").click(function() { $(".mobilemenu").slideToggle("slow", function() { $(".cross").hide(); $(".hamburger").show(); }); }); $(".clickham").click(function() { $(".mobilemenu").slideToggle("slow", function() { $(".cross").hide(); $(".hamburger").show(); }); });也会取消选中第一个项目。

Answer 1

Recycler视图回收OnBindViewHolder中的视图。因此，当点击项目时，它会反映在其他一些位置。创建全局SparseBooleanArray以存储单击的位置。

private final SparseBooleanArray array=new SparseBooleanArray();

然后在最终视图中添加clickListener并onClick存储所点击项目的位置。

public class ViewHolder extends RecyclerView.ViewHolder {
    public YOURVIEW view;
    public ViewHolder(View v) {
        super(v);
        view = (YOURVIEW) v.findViewById(R.id.YOURVIEWID);
        view.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                array.put(getAdapterPosition(),true);
                notifyDataSetChanged();
            }
        });
    }
}

在OnBindViewHolder内部，

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
    if(array.get(position)){
        holder.followDiseaseCheckBox.setChecked(true);
    }else{
        holder.followDiseaseCheckBox.setChecked(false);
    }
}

Answer 2

public class CardViewDataAdapter extends RecyclerView.Adapter<CardViewDataAdapter.ViewHolder> {
    private List<Student> stList;
    public CardViewDataAdapter(List<Student> students) {
        this.stList = students;
    }

@Override
public CardViewDataAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  // create a new view
    View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(
    R.layout.cardview_row, null);

  // create ViewHolder

  ViewHolder viewHolder = new ViewHolder(itemLayoutView);

  return viewHolder;
 }

 @Override
 public void onBindViewHolder(ViewHolder viewHolder, int position) {

  final int pos = position;

  viewHolder.tvName.setText(stList.get(position).getName());

  viewHolder.tvEmailId.setText(stList.get(position).getEmailId());

  viewHolder.chkSelected.setChecked(stList.get(position).isSelected());

  viewHolder.chkSelected.setTag(stList.get(position));


  viewHolder.chkSelected.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
    CheckBox cb = (CheckBox) v;
    Student contact = (Student) cb.getTag();

    contact.setSelected(cb.isChecked());
    stList.get(pos).setSelected(cb.isChecked());

    Toast.makeText(
      v.getContext(),
      "Clicked on Checkbox: " + cb.getText() + " is "
        + cb.isChecked(), Toast.LENGTH_LONG).show();
   }
  });

 }

 // Return the size arraylist
 @Override
 public int getItemCount() {
  return stList.size();
 }

 public static class ViewHolder extends RecyclerView.ViewHolder {

  public TextView tvName;
  public TextView tvEmailId;

  public CheckBox chkSelected;

  public Student singlestudent;

  public ViewHolder(View itemLayoutView) {
   super(itemLayoutView);

   tvName = (TextView) itemLayoutView.findViewById(R.id.tvName);

   tvEmailId = (TextView) itemLayoutView.findViewById(R.id.tvEmailId);
   chkSelected = (CheckBox) itemLayoutView.findViewById(R.id.chkSelected);

  }

 }

 // method to access in activity after updating selection
 public List<Student> getStudentist() {
  return stList;
 }
}

有关选中复选框的更多信息，请按此link

Answer 3

您可能错过了recylerview的一些概念。事实上，recyclerview每9个项目后绑定/回收相同的视图。因此，为了避免这种情况，只需在您的活动中使用setItemViewCacheSize()。

示例：

contactListAdapter = new ContactsListAdapter(ContactActivity.this, contactArrayList);
        mRecyclerView.setItemViewCacheSize(contactArrayList.size());
        mRecyclerView.setAdapter(contactListAdapter);

public void setItemViewCacheSize（int size）设置屏幕外的数量在将它们添加到可能共享的回收之前保留的视图查看池。屏幕外视图缓存始终了解更改附加适配器，允许LayoutManager重用这些视图未经修改而无需返回适配器重新绑定它们。参数：size - 返回前在屏幕外缓存的视图数他们到一般的回收视图池

Answer 4

public class SuggestionListAdapter extends RecyclerView.Adapter<SuggestionListAdapter.SuggestionListViewHolder> {

private List<Suggestion> mSuggestionList;
private Context mContext;



public class SuggestionListViewHolder extends RecyclerView.ViewHolder{
    private CheckBox mCheckBox;
    private LinearLayout mParent;


    public SuggestionListViewHolder(View itemView) {
        super(itemView);
        mCheckBox = (CheckBox)itemView.findViewById(R.id.list_display_checkbox);
        mParent =(LinearLayout)itemView.findViewById(R.id.list_parentll);
    }
}

public SuggestionListAdapter(List<Suggestion> suggestionList, Context context) {
    this.mSuggestionList = suggestionList;
    this.mContext = context;
}

@Override
public SuggestionListViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View new_suggestion_list_view = LayoutInflater.from(parent.getContext()).inflate(R.layout.suggestion_list,parent,false);
    return new SuggestionListViewHolder(new_suggestion_list_view);
}
@Override
public void onBindViewHolder(final SuggestionListViewHolder holder, final int position) {

    final Suggestion suggestion = mSuggestionList.get(position);

    holder.mCheckBox.setText(suggestion.getCategory());
    holder.mCheckBox.setOnCheckedChangeListener(null);
    holder.mCheckBox.setSelected(suggestion.isSelected());
    holder.mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(isChecked){
                suggestion.setSelected(true);
            }else {
                suggestion.setSelected(false);
            }
        }
    });
    holder.mCheckBox.setChecked(suggestion.isSelected());
}

@Override
public int getItemCount() {
    return mSuggestionList.size();
}

}

看看这个例子我相信你会发现你在哪里做错了，你可以解决你的问题。

在RecyclerView中选中复选框

4 个答案: