Android RecyclerView設置item間距

RecyclerView沒有能夠直接設置間距的屬性，但能夠用ItemDecoration來裝飾一個item，因此繼承重寫ItemDecoration就能夠實現間距了

public class SpaceItemDecoration extends RecyclerView.ItemDecoration{  
  
        private int space;  
  
        public SpaceItemDecoration(int space) {  
            this.space = space;  
        }  
  
        @Override  
        public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {  
  
            if(parent.getChildPosition(view) != 0)  
                outRect.top = space;  
        }  
    }

而後在使用RecyclerView的地方：

int spacingInPixels = getResources().getDimensionPixelSize(R.dimen.space);
 mRecyclerView.addItemDecoration(new SpaceItemDecoration(spacingInPixels));

Adapter填充上，再看看item就有間距了