Android - ProgressBar 的次要进度是什么？

Question

有人知道细节吗？有什么网站或建议吗？

Answer 1

来自 the source :

There is also a secondary progress displayable on a progress bar which is useful for displaying intermediate progress, such as the buffer level during a streaming playback progress bar.

可以找到 fully worked example显示这样的条，包括以特定样式显示这样的条的屏幕截图(从底部填充的圆形条):

在上图中，二级条是绿色区域，当它到达顶部时，一些子任务已经完成。