Android Recyclerview GridLayoutManager列间距

问题描述

如何使用GridLayoutManager设置RecyclerView的列间距？
在布局中设置边距/填充没有效果。

解决方案

RecyclerViews支持：每个元素周围的特殊偏移和绘图。如所示，您可以使用

  public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
 private int space; 
 
 public SpacesItemDecoration（int space）{
 this.space = space; 
} 
 
 @覆盖
公共无效getItemOffsets（矩形outRect，浏览视图，
 RecyclerView父，RecyclerView.State状态）{
 outRect.left =空间; 
 outRect.right =空格; 
 outRect.bottom = space; 
 
 //仅为第一项添加顶部边距以避免项目之间的双倍空间
 if（parent.getChildLayoutPosition（view）== 0）{
 outRect.top = space ; 
} else {
 outRect.top = 0; 
 
 
 
 code 
 $ b 
然后通过 p> 
 
 
  mRecyclerView =（RecyclerView）rootView.findViewById（R.id.my_recycler_view）; 
 int spacingInPixels = getResources（）。getDimensionPixelSize（R.dimen.spacing）; 
 mRecyclerView.addItemDecoration（new SpacesItemDecoration（spacingInPixels））; 
  
 
How do you set the column spacing with a RecyclerView using a GridLayoutManager? Setting the margin/padding inside my layout has no effect.
 解决方案 
RecyclerViews support the concept of ItemDecoration: special offsets and drawing around each element. As seen in this answer, you can use 
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.getChildLayoutPosition(view) == 0) {
        outRect.top = space;
    } else {
        outRect.top = 0;
    }
  }
}
Then add it via
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
int spacingInPixels = getResources().getDimensionPixelSize(R.dimen.spacing);
mRecyclerView.addItemDecoration(new SpacesItemDecoration(spacingInPixels));
                        
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