Recyclerview滚动时更改项目

Question

有人可以向我解释,问题是什么？

当我向下滚动然后回到顶部时,我的项目已更改为列表中的其他项目,如果我再次滚动,则会再次更改项目.

这是我的适配器.

public class AcademicAdapter extends RecyclerView.Adapter<AcademicAdapter.AcademicVH> {
    private LayoutInflater inflater;
    private List<AcademicStatus> data;

public AcademicAdapter(List<AcademicStatus> data) {
    this.data = data;
}

@Override
public AcademicVH onCreateViewHolder(ViewGroup parent, int viewType) {
    inflater = LayoutInflater.from(parent.getContext());
    View view = inflater.inflate(R.layout.row_academic_level, parent, false);

    return new AcademicVH(view);
}

@Override
public void onBindViewHolder(AcademicVH holder, int position) {
    View view = inflater.inflate(R.layout.row_container_academic_level, holder.containerData, false);

    TextView txtSubject = (TextView) view.findViewById(R.id.txtSubjectValue);
    TextView txtGroup = (TextView) view.findViewById(R.id.txtGroupValue);
    TextView txtStatus = (TextView) view.findViewById(R.id.txtStatusValue);
    TextView txtFinalNote = (TextView) view.findViewById(R.id.txtFinalNoteValue);
    TextView txtYear = (TextView) view.findViewById(R.id.txtYearValue);

    txtSubject.setText(data.get(position).getSubject());
    txtGroup.setText(data.get(position).getGroup());
    txtStatus.setText(data.get(position).getStatus());
    txtFinalNote.setText(data.get(position).getFinalNote());
    txtYear.setText(data.get(position).getAcademicYear());

    holder.containerData.addView(view);
}

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

public static class AcademicVH extends RecyclerView.ViewHolder {
    private LinearLayout containerData;

    public AcademicVH(View itemView) {
        super(itemView);

        containerData = (LinearLayout) itemView.findViewById(R.id.containerData);
    }
}
}

Answer 1

尝试初始化您的视图RecyclerView.ViewHolder并使您的布局膨胀,onCreateViewHolder()并且不要再次对布局进行充气onBindViewHolder().

public class AcademicAdapter extends RecyclerView.Adapter<AcademicAdapter.AcademicVH> {
    private LayoutInflater inflater;
    private List<AcademicStatus> data;

public AcademicAdapter(List<AcademicStatus> data) {
    this.data = data;
}

@Override
public AcademicVH onCreateViewHolder(ViewGroup parent, int viewType) {

    View mView = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_academic_level, parent, false);
    AcademicVH mViewHold = new ViewHolder(mView);
    return mViewHold;
}

@Override
public void onBindViewHolder(AcademicVH holder, int position) {
     final AcademicStatus mItems=this.data.get(position);


    holder.txtSubject.setText(mItems.getSubject());
    holder.txtGroup.setText(mItems.getGroup());
    holder.txtStatus.setText(mItems.getStatus());
    holder.txtFinalNote.setText(mItems.getFinalNote());
    holder.txtYear.setText(mItems.getAcademicYear());

}

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

public static class AcademicVH extends RecyclerView.ViewHolder {
    public LinearLayout containerData;
    public TextView txtSubject,txtGroup,txtStatus,txtFinalNote,txtYear;

    public AcademicVH(View itemView) {
        super(itemView);

        containerData = (LinearLayout) itemView.findViewById(R.id.containerData);
        txtSubject = (TextView) itemView.findViewById(R.id.txtSubjectValue);
        txtGroup = (TextView) itemView.findViewById(R.id.txtGroupValue);
        txtStatus = (TextView) itemView.findViewById(R.id.txtStatusValue);
        txtFinalNote = (TextView) itemView.findViewById(R.id.txtFinalNoteValue);
        txtYear = (TextView) itemView.findViewById(R.id.txtYearValue);
    }
}
}

Answer 2

Recyclerview shuffling 问题理解背后的概念

  @Override
  public void onBindViewHolder(final MyViewHolder holder, int position) {
      holder.setIsRecyclable(false);
  }

 @Override
 public long getItemId(int position) 
 {
        return position;
 }

 @Override
 public int getItemViewType(int position) 
 {
        return position;
 }

添加 setHasStableIds(true); 在您的适配器构造函数中并在适配器中覆盖这两个方法。

Answer 3

你在错误的地方定义了你的项目，在里面定义你的视图view holder，如下所示

public static class AcademicVH extends RecyclerView.ViewHolder {
private LinearLayout containerData;

public AcademicVH(View itemView) {
    super(itemView);
    TextView txtSubject = (TextView) view.findViewById(R.id.txtSubjectValue);
    TextView txtGroup = (TextView) view.findViewById(R.id.txtGroupValue);
    TextView txtStatus = (TextView) view.findViewById(R.id.txtStatusValue);
    TextView txtFinalNote = (TextView) view.findViewById(R.id.txtFinalNoteValue);
    TextView txtYear = (TextView) view.findViewById(R.id.txtYearValue);
    containerData = (LinearLayout) itemView.findViewById(R.id.containerData);
    }
}

另一个技巧，当您在 onBindViewHolder 中使用条件 (if) 时，您应该使用 (else) 完成它。