java - RecyclerView 和可扩展卡的奇怪故障-6ren

java - RecyclerView 和可扩展卡的奇怪故障

转载作者：行者123 更新时间：2023-11-30 00:10:35

<分区>

我正尝试进入 Android 应用程序开发，每个路线应用程序的步行时间很短。
但是一个小故障阻止了我继续。
我试着用谷歌搜索了很多次都没有结果，事情是这样的:

我的 RecyclerView 和 onClick-expand cards 显示奇怪的行为，当我在其中添加太多项目时会立即重新加载整个列表。它还以某种方式将整个列表向下移动了一秒钟。作为引用，这是我的 github 项目:https://github.com/TheInsayn/velocity

这是它的行为方式:
Imgur

但是在我添加了第 6 个项目之后它的行为是这样的:

Imgur

这是我用于适配器的代码(尤其是 onBindViewHolder 和 isExpanded):
我什至使用了 Google 在 I/O 2016 中的引用建议。(我真的不想使用第 3 方库)

class RecyclerAdapterWalks extends RecyclerView.Adapter<RecyclerAdapterWalks.WalkCardHolder> {
private List<Walk> mWalkList;
private RecyclerView mRecyclerView;
private int mExpandedPosition = -1;

class WalkCardHolder extends RecyclerView.ViewHolder {
    TextView mWalkRoute;
    TextView mWalkDuration;
    TextView mWalkDate;
    TextView mWalkWeekday;
    RelativeLayout mExpansion;
    TextView mAverageTime;

    WalkCardHolder(View view) {
        super(view);
        mWalkRoute = view.findViewById(R.id.txt_walk_route);
        mWalkDuration = view.findViewById(R.id.txt_walk_duration);
        mWalkDate = view.findViewById(R.id.txt_walk_date);
        mWalkWeekday = view.findViewById(R.id.txt_walk_weekday);
        mExpansion = view.findViewById(R.id.walk_card_expansion);
        mAverageTime = view.findViewById(R.id.txt_walk_average);
    }
}

RecyclerAdapterWalks(List<Walk> routes, RecyclerView rv) {
    mWalkList = routes;
    mRecyclerView = rv;
    setHasStableIds(true);
}

@Override
public WalkCardHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_walk, parent, false);
    return new WalkCardHolder(view);
}

@Override
public void onBindViewHolder(WalkCardHolder holder, int position) {
    Walk walk = mWalkList.get(position);
    holder.mWalkRoute.setText(walk.getRoute().getName());
    holder.mWalkDuration.setText(DateFormat.format("mm:ss", new Date(walk.getDuration())));
    holder.mWalkDate.setText(DateFormat.format("dd.MM.yyyy", walk.getDate()));
    holder.mWalkWeekday.setText(DateFormat.format("EEEE", walk.getDate()));
    //handle expansion in list
    final boolean isExpanded = position == mExpandedPosition;
    holder.mExpansion.setVisibility(isExpanded ? View.VISIBLE : View.GONE);
    holder.itemView.setActivated(isExpanded);
    holder.itemView.setOnClickListener(v -> {
        mExpandedPosition = isExpanded ? -1 : position;
        TransitionManager.beginDelayedTransition(mRecyclerView);
        notifyDataSetChanged();
    });
    if (isExpanded) {
        Date avg = new Date(walk.getRoute().getAverageWalkTime(mRecyclerView.getContext()));
        CharSequence min = DateFormat.format("m", avg);
        CharSequence sec = DateFormat.format("s", avg);
        String boldText = walk.getRoute().getName();
        String timeStr = "average walk duration for " + boldText + ": ";
        if (!min.equals("0")) timeStr += min + "m and ";
        timeStr += sec + "s";
        int idx = timeStr.indexOf(boldText);
        SpannableString str = new SpannableString(timeStr);
        str.setSpan(new StyleSpan(Typeface.BOLD), idx, idx + boldText.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        holder.mAverageTime.setText(str);
    }
}

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