Android RecyclerView 间距全适配

原文链接：https://segmentfault.com/a/1190000006858824

LinearLayoutManager spacing

import android.graphics.Rect; import android.support.v7.widget.RecyclerView; import android.view.View; /** * Created by anonymous on 2016/9/9 0009. * <p> * SpacesItemDecoration * <p> * mRecyclerView.addItemDecoration(new SpacesItemDecoration(5)); */ 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; } } }

使用方法很简单，上面注释中也已经给出：

mRecyclerView.addItemDecoration(new SpacesItemDecoration(5));

GridLayoutManager or StaggeredGridLayoutManager spacing

import android.graphics.Rect; import android.support.v7.widget.RecyclerView; import android.view.View; /** * Created by anonymous on 2016/9/9 0009. * <p> * GridSpacingItemDecoration * <p> * int spanCount = 3; // 3 columns * int spacing = 50; // 50px * boolean includeEdge = false; * recyclerView.addItemDecoration(new GridSpacingItemDecoration(spanCount, spacing, includeEdge)); */ public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration { private int spanCount; private int spacing; private boolean includeEdge; public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) { this.spanCount = spanCount; this.spacing = spacing; this.includeEdge = includeEdge; } @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { int position = parent.getChildAdapterPosition(view); // item position int column = position % spanCount; // item column if (includeEdge) { outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing) outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing) if (position < spanCount) { // top edge outRect.top = spacing; } outRect.bottom = spacing; // item bottom } else { outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing) outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f / spanCount) * spacing) if (position >= spanCount) { outRect.top = spacing; // item top } } } }

此处不仅对间距进行了处理，而且对spanCount也进行了处理，使用方法：

int spanCount = 3; // 3 columns int spacing = 50; // 50px boolean includeEdge = false; mRecyclerView.addItemDecoration(new GridSpacingItemDecoration(spanCount, spacing, includeEdge));