滚动时Recyclerview更改项目

Question

谁能给我解释一下，问题是什么？

当我向下滚动然后返回顶部时，我的项目已更改为列表中的其他项目，如果我再次滚动，项目再次更改。

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

尝试在RecyclerView.ViewHolder 上初始化您的视图并在onCreateViewHolder() 上膨胀您的布局，并且不要再次在onBindViewHolder() 上膨胀布局。

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 issue understanding of the concept behind

  @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覆盖这两个 适配器中的方法。

Answer 3

您在错误的位置定义了您的项目，在 view holder 中定义您的视图，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，当你在 onBindViewHolder 中使用条件 (if) 时，你应该使用 (else) 来完成它。

Answer 4

在您的 onBindViewHolder 中添加 holder.setIsRecyclable(false);

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

Answer 5

只需将 recylerView 放在 xml 中的 NestedScroll 视图中，然后添加属性 nestedScrollingEnabled = false。

然后在你的适配器 onBindViewHolder 添加这一行

final AcademicVH viewHolder = (AcademicVH)holder;

将此 viewHolder 对象与您的视图一起使用以设置文本或执行任何类型的 Click 事件。

例如 viewHolder.txtSubject.setText("Example");

Answer 6

库有问题 compile 'com.android.support:recyclerview-v7:25.0.0'。 尝试使用 compile 'com.android.support:recyclerview-v7:23.1.1'.