RecyclerView快速滚动拇指高度对于大型数据集太小

Question

我正在使用默认的recyclerview快速滚动，我遵循了本指南来支持它。

Answer 1

我通过从android.support.v7.widget.FastScroll复制FastScroll类来解决这个问题

然后我从xml中删除了启用的fast scroll，并使用以下代码应用了fast Scroller：

StateListDrawable verticalThumbDrawable = (StateListDrawable) getResources().getDrawable(R.drawable.fastscroll_sunnah);
Drawable verticalTrackDrawable = getResources().getDrawable(R.drawable.fastscroll_line_drawable);
StateListDrawable horizontalThumbDrawable = (StateListDrawable)getResources().getDrawable(R.drawable.fastscroll_sunnah);
Drawable horizontalTrackDrawable = getResources().getDrawable(R.drawable.fastscroll_line_drawable);

Resources resources = getContext().getResources();
new FastScroller(recyclerView, verticalThumbDrawable, verticalTrackDrawable,
                horizontalThumbDrawable, horizontalTrackDrawable,
                resources.getDimensionPixelSize(R.dimen.fastscroll_default_thickness),
                resources.getDimensionPixelSize(R.dimen.fastscroll_minimum_range),
                resources.getDimensionPixelOffset(R.dimen.fastscroll_margin));

在FastScroller类内部,我扩展了DefaultWidth：

FastScroller(RecyclerView recyclerView, StateListDrawable verticalThumbDrawable,
        Drawable verticalTrackDrawable, StateListDrawable horizontalThumbDrawable,
        Drawable horizontalTrackDrawable, int defaultWidth, int scrollbarMinimumRange,
        int margin) {
    ...
    this.defaultWidth = defaultWidth;
    ...

然后我更新了这个方法中的代码：

void updateScrollPosition(int offsetX, int offsetY) {
...
mVerticalThumbHeight = Math.max(defaultWidth * 4, Math.min(verticalVisibleLength,
                (verticalVisibleLength * verticalVisibleLength) / verticalContentLength));
...
...
mHorizontalThumbWidth = Math.max(defaultWidth * 4, Math.min(horizontalVisibleLength,
                (horizontalVisibleLength * horizontalVisibleLength) / horizontalContentLength));
...    
}

这确保最小拇指高度/宽度是默认宽度的4倍。