Android RecyclerView设置Item间距

RecyclerView 没有可以直接设置间距的属性，但是可以用 ItemDecoration 来实现。需要自定义 ItemDecoration，继承自 RecyclerView.ItemDecoration.

代码如下：

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public class SpacesItemDecoration extends RecyclerView.ItemDecoration {

  private int space;



  public SpacesItemDecoration(int space) {

    this.space = space;

  }



  @Override

  public void getItemOffsets(Rect outRect, View view, 

      RecyclerView parent, RecyclerView.State state) {

    outRect.left = space;

    outRect.right = space;

    outRect.bottom = space;



    // Add top margin only for the first item to avoid double space between items

    if(parent.getChildPosition(view) == 0)

        outRect.top = space;

  }

}

然后，初始化 RecyclerView 之后，设置间距。代码如下：

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recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

int itemSpacing = 8;

recyclerView.addItemDecoration(new SpacesItemDecoration(itemSpacing));

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