Android:ListView 和RecyclerView区别

时间:2020-07-19 22:35:51   收藏:0   阅读:79

缓存机制

 ListView的两级缓存

ListView的缓存和复用由它的父类AbsListView中的RecycleBin实现,设了两个缓存数组mActiveViews和mScrapViews。mActiveViews缓存显示在屏幕中的view,mScrapViews按ViewType缓存离屏的view

class RecycleBin {
    /**
     * The position of the first view stored in mActiveViews.
     */
    private int mFirstActivePosition;

    /**
     * Views that were on screen at the start of layout. This array is populated at the start of
     * layout, and at the end of layout all view in mActiveViews are moved to mScrapViews.
     * Views in mActiveViews represent a contiguous range of Views, with position of the first
     * view store in mFirstActivePosition.
     */
    private View[] mActiveViews = new View[0];

    /**
     * Unsorted views that can be used by the adapter as a convert view.
     */
    private ArrayList<View>[] mScrapViews;
}

 

 

 

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原文:https://www.cnblogs.com/billshen/p/13340947.html

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