笔记6 | 从源码理解分析mScrollX和mScrollY，scrollTo()和scrollBy()，smoothScrollTo和smoothScrollBy

前言

我想开头先说说

a.度娘一下什么都知道了，整理这些东西有什么用？还费时费力的！如何才能完全掌握一个知识？当你能把它讲清楚的时候，你才算掌握了他。

想完全把mScrollX和mScrollY，scrollTo()和scrollBy()，smoothScrollTo和smoothScrollBy弄明白并不容易，但查阅他们的源代码基本就能明白个大概，这篇文章就是从源码分析他们究竟有什么作用和区别，读懂了基本就会用！

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公众号

目录

• mScrollX和mScrollY
• scrollTo()和scrollBy()
• smoothScrollBy和smoothScrollTo
• view和viewgroup

一.mScrollX和mScrollY

 
 

  
  
/**
  
  
 * The offset, in pixels, by which the content of this view is scrolled
  
  
 * horizontally.
  
  
 * {@hide}
  
  
 */
  
  
 @ViewDebug.ExportedProperty(category = "scrolling")
  
  
 protected int mScrollX;
  
  
 /**
  
  
 * The offset, in pixels, by which the content of this view is scrolled
  
  
 * vertically.
  
  
 * {@hide}
  
  
 */
  
  
 @ViewDebug.ExportedProperty(category = "scrolling")
  
  
 protected int mScrollY;
  
  

  
  

  
  
 /**
  
  
 * Return the scrolled left position of this view. This is the left edge of
  
  
 * the displayed part of your view. You do not need to draw any pixels
  
  
 * farther left, since those are outside of the frame of your view on
  
  
 * screen.
  
  
 *
  
  
 * @return The left edge of the displayed part of your view, in pixels.
  
  
 */
  
  
 public final int getScrollX() { 
       
  
  
 return mScrollX;