AbstractListView源码分析6

/**
     * Subclasses must retain their measure spec from onMeasure() into this member
     */

    int mWidthMeasureSpec = 0; 子类通过OnMeasure方法获得measure spec

 /**
     * The top scroll indicator:向上的指示器
     */
    View mScrollUp;

/**
     * The down scroll indicator：向下的指示器
     */
    View mScrollDown

 /**
     * When the view is scrolling, this flag is set to true to indicate subclasses that
     * the drawing cache was enabled on the children：当视图滑动时，这个标志设置为true表明子类，绘制缓存能够          设置到children。
     */
    boolean mCachingStarted;
    boolean mCachingActive;