/**
? ? ?* Maximum distance to record overscroll 記錄overscroll的最大的距離
? ? ?*/
? ? int mOverscrollMax;


? ? /**
? ? ?* Content height divided by this is the overscroll limit.內容的高度除以這個數(shù)值，為overscroll的limit
? ? ?*/

? ? static final int OVERSCROLL_LIMIT_DIVISOR = 3;

/**
? ? ?* How many positions in either direction we will search to try to
? ? ?* find a checked item with a stable ID that moved position across
? ? ?* a data set change. If the item isn't found it will be unselected.
? ? ?*/
? ? private static final int CHECK_POSITION_SEARCH_DISTANCE = 20;在一個方向將要搜索的位置數(shù)目，來尋找一個checked的條目（帶有stable ID）整個數(shù)據集的改變。如果這個item沒有被發(fā)現(xiàn)，它將是unselected。

?/**
? ? ?* Used to request a layout when we changed touch mode被用來請求一個布局當我們改變了touchmode
? ? ?*/
? ? private static final int TOUCH_MODE_UNKNOWN = -1;
? ? private static final int TOUCH_MODE_ON = 0;
? ? private static final int TOUCH_MODE_OFF = 1;

?private int mLastTouchMode = TOUCH_MODE_UNKNOWN;

? ? private static final boolean PROFILE_SCROLLING = false;
? ? private boolean mScrollProfilingStarted = false;

/**
? ? ?* The StrictMode "critical time span" objects to catch animation
? ? ?* stutters. ?Non-null when a time-sensitive animation is
? ? ?* in-flight. ?Must call finish() on them when done animating.
? ? ?* These are no-ops on user builds.
? ? ?*/
? ? private StrictMode.Span mScrollStrictSpan = null;
? ? private StrictMode.Span mFlingStrictSpan = null;

/**
? ? ?* The last CheckForLongPress runnable we posted, if any
? ? ?*/
? ? private CheckForLongPress mPendingCheckForLongPress;


? ? /**
? ? ?* The last CheckForTap runnable we posted, if any
? ? ?*/
? ? private CheckForTap mPendingCheckForTap;


? ? /**
? ? ?* The last CheckForKeyLongPress runnable we posted, if any
? ? ?*/
? ? private CheckForKeyLongPress mPendingCheckForKeyLongPress;

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