AbstractListView源码分析2

     /**
     * Regular layout - usually an unsolicited layout from the view system，一般的布局
     */
    static final int LAYOUT_NORMAL = 0;


    /**
     * Show the first item，展示第一项
     */
    static final int LAYOUT_FORCE_TOP = 1;
    /**
     * Force the selected item to be on somewhere on the screen，强制选择的条目显示在屏幕的某个位置上
     */
    static final int LAYOUT_SET_SELECTION = 2;

    /**
     * Show the last item，展示最后的条目
     */
    static final int LAYOUT_FORCE_BOTTOM = 3;

    /**
     * Make a mSelectedItem appear in a specific location and build the rest of
     * the views from there. The top is specified by mSpecificTop.让选择的条目显示在指定的位置和建立从这个视图到那的。
     */
    static final int LAYOUT_SPECIFIC = 4;

    /**
     * Layout to sync as a result of a data change. Restore mSyncPosition to have its top
     * at mSpecificTop   布局和数据改变同步
     */

    static final int LAYOUT_SYNC = 5;

  /**
     * Layout as a result of using the navigation keys，布局使用导航keys的作为结果
     */
    static final int LAYOUT_MOVE_SELECTION = 6;