回收器视图不能流畅地滚动

Question

我的活动中有一个片段，其结构如下：

<android.support.v7.widget.RecyclerView android:id="@+id/cafeRecyclerView"
                                    xmlns:android="http://schemas.android.com/apk/res/android"
                                    android:layout_width="match_parent"
                                    android:layout_height="match_parent"/>

它只有一个回收视图。它有一个适配器，其代码如下：

public class InfinityFragmentRecyclerAdapter extends RecyclerView.Adapter       implements HasDatabase
{
protected JsonDatabase jsonDatabase = new JsonDatabase();
protected Context mContext;
protected int arrangeMode;

public InfinityFragmentRecyclerAdapter(Context context, int viewMode)
{
    mContext = context;
    arrangeMode = viewMode;
}

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i)
{
    View view;
    if (arrangeMode == SupportsGridAndListArrangement.GRID_VIEW)
    {
        view = LayoutInflater.from(viewGroup.getContext()).inflate
                (R.layout.grid_advertisement_layout, null);
    }
    else
    {
        view = LayoutInflater.from(viewGroup.getContext()).inflate
                (R.layout.list_advertisement_layout, null);
    }
    return new ItemHolder(view, mContext, arrangeMode);
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i)
{
    AdItemPassiveDataSet adItemPassiveDataSet = (AdItemPassiveDataSet) jsonDatabase.getDataSetAt(i);

    Picasso.with(mContext).load(adItemPassiveDataSet.getItemThumbnailAddress()).into
            (((ItemHolder) viewHolder).imageView);
    ((ItemHolder) viewHolder).adID = adItemPassiveDataSet.getItemID();
    ((ItemHolder) viewHolder).userID = adItemPassiveDataSet.getUserID();
    ((ItemHolder) viewHolder).userRole = adItemPassiveDataSet.getUserRole();
    ((ItemHolder) viewHolder).price.setText(adItemPassiveDataSet.getItemPrice(), false);
    ((ItemHolder) viewHolder).title.setText(adItemPassiveDataSet.getItemTitle(), false);
    ((ItemHolder) viewHolder).state.setText(adItemPassiveDataSet.getItemState(), false);
    ((ItemHolder) viewHolder).date.setText(adItemPassiveDataSet.getItemTime(), false);

    if (arrangeMode == SupportsGridAndListArrangement.LIST_VIEW)
    {
        ((ItemHolder) viewHolder).description.setText(adItemPassiveDataSet.getItemDescription());

        StaggeredGridLayoutManager.LayoutParams layoutParams =
                new StaggeredGridLayoutManager.LayoutParams
                        (ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        layoutParams.setFullSpan(true);
        viewHolder.itemView.setLayoutParams(layoutParams);
    }
}

@Override
public int getItemCount()
{
    if (jsonDatabase != null)
    {
        return jsonDatabase.getCount();
    }
    else
    {
        return 0;
    }
}

@Override
public JsonDatabase getDatabase()
{
    return jsonDatabase;
}

public void append(Object newJsonDatabase)
{
    int currentCount = 0;
    if (jsonDatabase != null)
    {
        currentCount = jsonDatabase.getCount();
    }
    int newCount = ((JsonDatabase) newJsonDatabase).getCount();
    jsonDatabase.appendAtEnd((JsonDatabase) newJsonDatabase);
    for (int i = currentCount; i < (currentCount + newCount); i++)
    {
        notifyItemInserted(i);
    }
}
}

我还以这种方式设置我的片段：

        recyclerView = (RecyclerView) findViewById(R.id.cafeRecyclerView);
    recyclerViewAdapter = new InfinityFragmentRecyclerAdapter(this, SupportsGridAndListArrangement.GRID_VIEW);
    StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL);
    recyclerView.setLayoutManager(staggeredGridLayoutManager);
    recyclerView.setAdapter(recyclerViewAdapter);

每次我从服务器接收到新数据时，我都会通过以下方式将它们添加到cardwiews中的RecyclerView：

recyclerViewAdapter.append(newJsonDatabase);

每件事都很好！我可以下载数据，将它们添加到回收者视图等等，但问题是回收者视图不流畅滚动。我真的很困惑。有什么想法吗？任何帮助将不胜感激。

Answer 1

尝试使用notifyItemRangeInserted（）而不是notifyItemInserted（）

如果我理解正确，您的代码应该是这样的

notifyItemInserted(currentCount, currentCount + newCount);