RecyclerViewは各item間の間隔を設定します

RecyclerViewは各item間の間隔を設定します

private void initDecoration() {
        HashMap<String, Integer> stringIntegerHashMap = new HashMap<>();
        stringIntegerHashMap.put(RecyclerViewSpacesItemDecoration.TOP_DECORATION, 0);//top  
        stringIntegerHashMap.put(RecyclerViewSpacesItemDecoration.BOTTOM_DECORATION, 0);//    
        stringIntegerHashMap.put(RecyclerViewSpacesItemDecoration.LEFT_DECORATION, 6);//   
        stringIntegerHashMap.put(RecyclerViewSpacesItemDecoration.RIGHT_DECORATION, 6);//   
        firstRecycler.addItemDecoration(new RecyclerViewSpacesItemDecoration(stringIntegerHashMap));
        secondRecycler.addItemDecoration(new RecyclerViewSpacesItemDecoration(stringIntegerHashMap));
    }

public class RecyclerViewSpacesItemDecoration extends RecyclerView.ItemDecoration {
    private HashMap<String, Integer> mSpaceValueMap;

    public static final String TOP_DECORATION = "top_decoration";
    public static final String BOTTOM_DECORATION = "bottom_decoration";
    public static final String LEFT_DECORATION = "left_decoration";
    public static final String RIGHT_DECORATION = "right_decoration";

    public RecyclerViewSpacesItemDecoration(HashMap<String, Integer> mSpaceValueMap) {
        this.mSpaceValueMap = mSpaceValueMap;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view,
                               RecyclerView parent, RecyclerView.State state) {
        if (mSpaceValueMap.get(TOP_DECORATION) != null)
            outRect.top = mSpaceValueMap.get(TOP_DECORATION);
        if (mSpaceValueMap.get(LEFT_DECORATION) != null)

            outRect.left = mSpaceValueMap.get(LEFT_DECORATION);
        if (mSpaceValueMap.get(RIGHT_DECORATION) != null)
            outRect.right = mSpaceValueMap.get(RIGHT_DECORATION);
        if (mSpaceValueMap.get(BOTTOM_DECORATION) != null)
            outRect.bottom = mSpaceValueMap.get(BOTTOM_DECORATION);
    }
}