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ItemDecoration for recycleview horizontal and vertical
package com.utils;
import android.graphics.Rect;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
public class EqualSpacingItemDecoration extends RecyclerView.ItemDecoration {
private final int spacing;
private int displayMode;
public static final int HORIZONTAL = 0;
public static final int VERTICAL = 1;
public static final int GRID = 2;
public EqualSpacingItemDecoration(int spacing) {
this(spacing, -1);
}
public EqualSpacingItemDecoration(int spacing, int displayMode) {
this.spacing = spacing;
this.displayMode = displayMode;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int position = parent.getChildViewHolder(view).getAdapterPosition();
int itemCount = state.getItemCount();
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
setSpacingForDirection(outRect, layoutManager, position, itemCount);
}
private void setSpacingForDirection(Rect outRect,
RecyclerView.LayoutManager layoutManager,
int position,
int itemCount) {
// Resolve display mode automatically
if (displayMode == -1) {
displayMode = resolveDisplayMode(layoutManager);
}
switch (displayMode) {
case HORIZONTAL:
outRect.left = spacing;
outRect.right = position == itemCount - 1 ? spacing : 0;
outRect.top = spacing;
outRect.bottom = spacing;
break;
case VERTICAL:
outRect.left = spacing;
outRect.right = spacing;
outRect.top = spacing;
outRect.bottom = position == itemCount - 1 ? spacing : 0;
break;
case GRID:
if (layoutManager instanceof GridLayoutManager) {
GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
int cols = gridLayoutManager.getSpanCount();
int rows = itemCount / cols;
outRect.left = spacing;
outRect.right = position % cols == cols - 1 ? spacing : 0;
outRect.top = spacing;
outRect.bottom = position / cols == rows - 1 ? spacing : 0;
}
break;
}
}
private int resolveDisplayMode(RecyclerView.LayoutManager layoutManager) {
if (layoutManager instanceof GridLayoutManager) return GRID;
if (layoutManager.canScrollHorizontally()) return HORIZONTAL;
return VERTICAL;
}
}
/// item decoration use in layout
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.addItemDecoration(new EqualSpacingItemDecoration(30, EqualSpacingItemDecoration.VERTICAL));
recyclerView.setLayoutManager(linearLayoutManager);
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