StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
layoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_MOVE_ITEMS_BETWEEN_SPANS);
//设置SpanSizeLookup
layoutManager.setSpanSizeLookup(new StaggeredGridLayoutManager.SpanSizeLookup() {
    @Override
    public int getSpanSize(int position) {
        //返回跨度为1,即占据一行或一列的单元格数量
        return 1;
    }
});
//设置getItemOffsets
RecyclerView.ItemDecoration spacingDecoration = new RecyclerView.ItemDecoration() {
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        //设置单元格之间的间距
        outRect.set(10, 10, 10, 10);
    }
};
mRecyclerView.addItemDecoration(spacingDecoration);
其中,SpanSizeLookup可以让每个单元格占据1列或1行,getItemOffsets可以设置单元格之间的间距。