RecyclerView在设置适配器时会阻塞用户界面。

我有一个需求，我有一个有超过30万行的填充数据库。我已经成功地根据这个问题实现了一个基于CursorAdapter的适配器，并混合了两个最高得票的答案这里。\n我已经实现了一个用于后台服务的AsyncTask来执行对数据库的查询，速度非常快，不超过2-3秒。我的AsyncTask中的ProgressDialog有时很难检测到。\n我的问题是，当任务完成并且我检索到Cursor时，当我将适配器设置给RecyclerView时，该过程会冻结我的UI几秒钟，直到数据设置完成。当我执行搜索（新查询，与获取所有行的过程相同，但行数较少）并替换Cursor以更新数据时，也会发生这种情况。\n下面是一些相关的代码：\nAsyncTask\n

@Override
protected Void doInBackground(Void... Void) {
    if(type==Constants.GET_ZIP_CODES)
        cursor = db.getAllZipCodes();
    else
        cursor = db.searchZipCodes(text);
    return null;
}
@Override
protected void onPostExecute(Void Void) {
    setAdapter();
    mProgressDialog.dismiss();
    super.onPostExecute(Void);
}

\n方法\n

private void setAdapter(){
    if(myAdapter == null){
        myAdapter = new MyAdapter(getActivity(), cursor);
        search_rv.setAdapter(myAdapter);
    } else
        myAdapter.swapCursor(cursor);
}

\n由于这是一个搜索，我在这里除了notifyDataSetChanged()之外没有太多要做的，因为每次搜索时数据都会广泛更改。\n这正常吗？由于RecyclerView只渲染可见视图，为什么会冻结并花费很长时间来更新，因为Cursor已经准备好来自AsyncTask的数据？\n编辑\n我已经更改了我的适配器，避免使用CursorAdapter，因为@cricket_007指出在适配器中使用另一个适配器是不好的设计。\n这是我的适配器：\n

public class SearchListAdapter extends RecyclerView.Adapter {
private Context mContext;
private Cursor mCursor;
private boolean mDataValid;
private int mRowIdColumn;
private DataSetObserver mDataSetObserver;
public SearchListAdapter(Context context, Cursor c) {
    mContext = context;
    mCursor=c;
    mDataValid = c != null;
    mRowIdColumn = mDataValid ? mCursor.getColumnIndex("_id") : -1;
    mDataSetObserver = new NotifyingDataSetObserver();
    if (mCursor != null) {
        mCursor.registerDataSetObserver(mDataSetObserver);
    }
}
static class ViewHolder extends RecyclerView.ViewHolder {
    TextView itemTV;
    ViewHolder(View itemView) {
        super(itemView);
        itemTV = (TextView) itemView.findViewById(R.id.itemTV);
    }
}
@Override
public void setHasStableIds(boolean hasStableIds) {
    super.setHasStableIds(true);
}
@Override
public int getItemCount() {
    if (mDataValid && mCursor != null) {
        return mCursor.getCount();
    }
    return 0;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    // Passing the binding operation to cursor loader
    mCursor.moveToPosition(position);
    String town = mCursor.getString(mCursor.getColumnIndex(Constants.COLUMN_TOWN));
    String zipcode = mCursor.getString(mCursor.getColumnIndex(Constants.COLUMN_ZIPCODE));
    String zipcode_etx = mCursor.getString(mCursor.getColumnIndex(Constants.COLUMN_ZIPCODE_EXTENSION));
    holder.itemTV.setText(zipcode+"-"+zipcode_etx+", "+town);
}
@Override
public SearchListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_search_list_item,parent,false);
    // Passing the inflater job to the cursor-adapter
    return new SearchListAdapter.ViewHolder(itemView);
}
public void swapCursor(Cursor cursor) {
    Cursor old = changeCursor(cursor);
    if (old != null) {
        old.close();
    }
}
private Cursor changeCursor(Cursor newCursor) {
    if (newCursor == mCursor) {
        return null;
    }
    final Cursor oldCursor = mCursor;
    if (oldCursor != null && mDataSetObserver != null) {
        oldCursor.unregisterDataSetObserver(mDataSetObserver);
    }
    mCursor = newCursor;
    if (mCursor != null) {
        if (mDataSetObserver != null) {
            mCursor.registerDataSetObserver(mDataSetObserver);
        }
        mRowIdColumn = newCursor.getColumnIndexOrThrow("_id");
        mDataValid = true;
        notifyDataSetChanged();
    } else {
        mRowIdColumn = -1;
        mDataValid = false;
        notifyDataSetChanged();
    }
    return oldCursor;
}
private class NotifyingDataSetObserver extends DataSetObserver {
    @Override
    public void onChanged() {
        super.onChanged();
        mDataValid = true;
        notifyDataSetChanged();
    }
    @Override
    public void onInvalidated() {
        super.onInvalidated();
        mDataValid = false;
        notifyDataSetChanged();
    }
}
}