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Android 开发 RecyclerView设置间距

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10/30
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实现步骤

  1. 首先要创建一个类继承RecyclerView.ItemDecoration
  2. 然后重新这个类的getItemOffsets方法,删除方法里的super.getItemOffsets(outRect, view, parent, state);
  3. 在outRect里的属性分别设置对应方向间隔
  4. 在activity里new一个我们继承重写好的类,然后在mRecyclerView.addItemDecoration(new Divider);导入

设置全部item的间距例子

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); }}

判断并且设置特定位置item的间距的例子

public class TLeaveItemDivider extends RecyclerView.ItemDecoration { @Override public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) { if (parent.getChildAdapterPosition(view) == state.getItemCount()-1){//判断是不是最后一个item outRect.top = 0; return; }else { outRect.top = UnitConversionUtil.dip2px(parent.getContext(),15); } }}

导入方法

mRecyclerView.addItemDecoration(new TLeaveItemDivider());