我完全迷失了这个错误,我理解它,但我不知道出了什么问题。
对于代码:
// In the OnCreate of my activity
historyRecyclerView = (RecyclerView)findViewById(R.id.recycler_suggestions);
SearchBarHistoryAdapter searchBarHistoryAdapter = new SearchBarHistoryAdapter();
searchBarHistoryAdapter.setActivity(this);
historyRecyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
historyRecyclerView.setAdapter(searchBarHistoryAdapter);
searchBarDisplayManager.setTypeAdapter(SearchBarDisplayManager.SEARCH_TYPE.HISTORY, searchBarHistoryAdapter);
The SearchDisplayManager
仅包含适配器列表。
适配器:
public class SearchBarHistoryAdapter extends SearchBarAdapter {
private ArrayList<String> historyList;
private HistoryTask historyTask;
private void setHistoryList(ArrayList<String> history) {
historyList = history;
notifyDataSetChanged();
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.search_list_item, parent, false);
final HistoryViewHolder historyViewHolder = new HistoryViewHolder(v);
return historyViewHolder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((HistoryViewHolder) holder).bind(historyList.get(position));
}
@Override
public int getItemCount() {
return historyList == null ? 0 : historyList.size();
}
@Override
public void startSearch(String searchString) {
if(TextUtils.isEmpty(searchString)) {
if (historyTask != null) {
historyTask.cancel(true);
}
historyTask = new HistoryTask();
historyTask.execute();
}else{
setHistoryList(null);
}
}
private class HistoryTask extends AsyncTask<Void, Void, ArrayList<String>> {
@Override
protected ArrayList<String> doInBackground(Void... params) {
String history = HelperUI.getSearchbarHistory(activity);
if (!TextUtils.isEmpty(history)) {
return new ArrayList<>(Arrays.asList(history.split("--")));
}
return new ArrayList<>(0);
}
@Override
protected void onPostExecute(ArrayList<String> results) {
super.onPostExecute(results);
if (!results.isEmpty()) {
setHistoryList(results);
}
historyTask = null;
}
}
private class HistoryViewHolder extends RecyclerView.ViewHolder {
TextView hint, name;
ImageView img;
public HistoryViewHolder(View v) {
super(v);
name = (TextView) v.findViewById(R.id.app_label);
hint = ((TextView) v.findViewById(R.id.type_label));
img = ((ImageView) v.findViewById(R.id.item_icon));
}
public void bind(String suggestion) {
name.setText(Html.fromHtml(suggestion));
img.setImageDrawable(activity.getResources().getDrawable(R.drawable.ic_public_grey600_48dp));
img.setTag(suggestion);
}
}
}
这是疯狂的部分,当我更新列表时setHistoryList
,我知道回收器视图有正确的适配器,但它不是null
...但后来它有点丢失了,当它尝试更新时,回收器视图中不再有适配器notifyDatasetChanged()
...它就消失了,当然,什么也没有显示。
知道出了什么问题吗?