RecyclerView调节项目间间距大小

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调用处直接调用

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//设置item之间的间隔
SpacesItemDecoration decoration = new SpacesItemDecoration(8);
recyclerView.addItemDecoration(decoration);

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class SpacesItemDecoration extends RecyclerView.ItemDecoration {

    private int space;
    private StaggeredGridLayoutManager.LayoutParams lp;

    public SpacesItemDecoration(int space) {
        this.space = space;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {

        int position = parent.getChildAdapterPosition(view);
        lp = (StaggeredGridLayoutManager.LayoutParams)view.getLayoutParams();
        if (position == 0 || position==1){
            outRect.top = space * 2;
        } else {
            outRect.top = space;
        }

        if (lp.getSpanIndex() == 0) {
            outRect.left = space * 2;
            outRect.right = space;
        } else {
            outRect.left = space;
            outRect.right = space * 2;
        }
        outRect.bottom = space;

        //注掉的方法总有漏网之鱼，不知为啥
//        outRect.left = space;
//        outRect.right = space;
//        outRect.bottom = space;
//        if (position == 0 || position == 1) {
//            //用于设置第一行跟顶部的距离
//            outRect.top = space;
//        }
//
//        if (lp.getSpanIndex() == 0) {
//            //用于设同行两个间隔间跟其距离左右屏幕间隔相同
//            outRect.right = 0;
//        }
    }
}