Android RecyclerView 設定item間隔的方法

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RecyclerView大家常用，但是如何給載入出來的item增加間隔很多人都不知道，下面是方法，直接上代碼了：

LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());recyclerView.setLayoutManager(layoutManager);qujangAdapter = new QujiangAdapter(qujiangList, getActivity());//設定item間距，30dprecyclerView.addItemDecoration(new SpaceItemDecoration(30));recyclerView.setAdapter(qujangAdapter);

上面的代碼是用一個LinearLayoutManager 載入RecyclerView，和一般載入代碼不一樣的是多了  recyclerView.addItemDecoration(new SpaceItemDecoration(30)); 這一行代碼。

 下面是SpaceItemDecoration類的實現：

class SpaceItemDecoration extends RecyclerView.ItemDecoration {    int mSpace;     /**     * Retrieve any offsets for the given item. Each field of <code>outRect</code> specifies     * the number of pixels that the item view should be inset by, similar to padding or margin.     * The default implementation sets the bounds of outRect to 0 and returns.     * <p>     * <p>     * If this ItemDecoration does not affect the positioning of item views, it should set     * all four fields of <code>outRect</code> (left, top, right, bottom) to zero     * before returning.     * <p>     * <p>     * If you need to access Adapter for additional data, you can call     * {@link RecyclerView#getChildAdapterPosition(View)} to get the adapter position of the     * View.     *     * @param outRect Rect to receive the output.     * @param view    The child view to decorate     * @param parent  RecyclerView this ItemDecoration is decorating     * @param state   The current state of RecyclerView.     */    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        super.getItemOffsets(outRect, view, parent, state);        outRect.left = mSpace;        outRect.right = mSpace;        outRect.bottom = mSpace;        if (parent.getChildAdapterPosition(view) == 0) {            outRect.top = mSpace;        }     }     public SpaceItemDecoration(int space) {        this.mSpace = space;    }}

　在該類的getItemOffsets方法中設定item各個方向的間距。這裡面加入了如果是RecyclerView的第一個子項，則設定該子項上方的間距。

     運行出來之後就會發現每個item四周都有間距了。

Android RecyclerView 設定item間隔的方法