问题效果图：

  从上图中可以清楚的看到，垂直方向上面的图标的间距是比较大的，所以按照这个问题我的思路1是更改Workspace空间的高度，这样图标之间垂直方向的间距就会减小，这是因为这是一个6*5的布局，减小Workspace的高度，仍然是6*5的布局，这样就会减小垂直方向图标的间距。但是我没有这么做，相反我有一个更加简单的思路2，那就是更改Workspace顶端和底端的内边距，这样也做到了垂直方向空间的压缩，是比较不错的，代码实现如下：

修改前代码：

    @Override
    public void setInsets(Rect insets) {
        DeviceProfile grid = mLauncher.getDeviceProfile();

        mWorkspaceFadeInAdjacentScreens = grid.shouldFadeAdjacentWorkspaceScreens();

        Rect padding = grid.workspacePadding;
        setPadding(padding.left, padding.top, padding.right, padding.bottom);
        mInsets.set(insets);

        if (mWorkspaceFadeInAdjacentScreens) {
            // In landscape mode the page spacing is set to the default.
            setPageSpacing(grid.edgeMarginPx);
        } else {
            // In portrait, we want the pages spaced such that there is no
            // overhang of the previous / next page into the current page viewport.
            // We assume symmetrical padding in portrait mode.
            int maxInsets = Math.max(insets.left, insets.right);
            int maxPadding = Math.max(grid.edgeMarginPx, padding.left + 1);
            setPageSpacing(Math.max(maxInsets, maxPadding));
        }

        updateCellLayoutPadding();
        updateWorkspaceWidgetsSizes();
        setPageIndicatorInset();
    }

修改后的代码：

    @Override
    public void setInsets(Rect insets) {
        DeviceProfile grid = mLauncher.getDeviceProfile();

        mWorkspaceFadeInAdjacentScreens = grid.shouldFadeAdjacentWorkspaceScreens();

        Rect padding = grid.workspacePadding;

		this.isLandscape = grid.isLandscape2;
		if(isLandscape){
			setPadding(padding.left, padding.top, padding.right, padding.bottom);
		}else{
			//setPadding(15, padding.top+120, 15, padding.bottom+100);
			setPadding(padding.left, padding.top, padding.right, padding.bottom);
		}

		mInsets.set(insets);

        if (mWorkspaceFadeInAdjacentScreens) {
            // In landscape mode the page spacing is set to the default.
            setPageSpacing(grid.edgeMarginPx);
        } else {
            // In portrait, we want the pages spaced such that there is no
            // overhang of the previous / next page into the current page viewport.
            // We assume symmetrical padding in portrait mode.
            int maxInsets = Math.max(insets.left, insets.right);
            int maxPadding = Math.max(grid.edgeMarginPx, padding.left + 1);
            setPageSpacing(Math.max(maxInsets, maxPadding));
        }

        updateCellLayoutPadding();
        updateWorkspaceWidgetsSizes();
        setPageIndicatorInset();
    }

修改后的效果图：