Android RecyclerView OnScrollListener

Question

各位版主大神，这种是什么错误，该怎么解决呢？

Answer 1

public class MyRecyclerView extends RecyclerView implements RecyclerView.OnScrollListener
{

/**
 * 记录当前第一个View
 */
private View mCurrentView;

private OnItemScrollChangeListener mItemScrollChangeListener;

public void setOnItemScrollChangeListener(OnItemScrollChangeListener mItemScrollChangeListener)
{
    this.mItemScrollChangeListener = mItemScrollChangeListener;
}

public interface OnItemScrollChangeListener
{
    void onChange(View view, int position);
}

public MyRecyclerView(Context context, AttributeSet attrs)
{
    super(context, attrs);
    // TODO Auto-generated constructor stub
    this.setOnScrollListener(this);
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
    super.onLayout(changed, l, t, r, b);

    mCurrentView = getChildAt(0);

    if (mItemScrollChangeListener != null)
    {
        mItemScrollChangeListener.onChange(mCurrentView, getChildPosition(mCurrentView));
    }
}


@Override
public void onScrollStateChanged(int arg0)
{
}

/**
 *
 * 滚动时，判断当前第一个View是否发生变化，发生才回调
 */
@Override
public void onScrolled(int arg0, int arg1)
{
    View newView = getChildAt(0);

    if (mItemScrollChangeListener != null)
    {
        if (newView != null && newView != mCurrentView)
        {
            mCurrentView = newView ;
            mItemScrollChangeListener.onChange(mCurrentView, getChildPosition(mCurrentView));
        }
    }

}

}