RecycleVIew的表格布局设置分割线 RecycleVIew的表格布局设置分割线

1.重写分割线

public class DividerItemDecoration2 extends RecyclerView.ItemDecoration { private Drawable mHorizontalDivider; //横向的分割线 private Drawable mVerticalDivider; //纵向的分割线 private int mDividerWidth; private int mDividerHeight; private int mUnderLayerOrientation = GridLayoutManager.HORIZONTAL; //横向还是纵向的分割线在下，因为有重叠部分public DividerItemDecoration2(Context context, @DrawableRes int drawRes, @DimenRes int dividerSizeRes) { this(ContextCompat.getDrawable(context, drawRes), context.getResources(). getDimensionPixelSize(dividerSizeRes)); }public DividerItemDecoration2(Context context, @DrawableRes int drawRes, @DimenRes int dividerWidthRes, @DimenRes int dividerHeightRes) { this(ContextCompat.getDrawable(context, drawRes), context.getResources(). getDimensionPixelSize(dividerWidthRes), context.getResources(). getDimensionPixelSize(dividerHeightRes)); }public DividerItemDecoration2(Context context, @DrawableRes int horizontalDrawRes, @DrawableRes int verticalDrawRes, @DimenRes int dividerWidthRes, @DimenRes int dividerHeightRes) { this(ContextCompat.getDrawable(context, horizontalDrawRes), ContextCompat.getDrawable( context, verticalDrawRes), context.getResources().getDimensionPixelSize( dividerWidthRes), context.getResources().getDimensionPixelSize(dividerHeightRes)); }public DividerItemDecoration2(@NonNull Drawable divider, int dividerSize) { this(divider, dividerSize, dividerSize); }public DividerItemDecoration2(@NonNull Drawable divider, int dividerWidth, int dividerHeight) { this(divider, divider, dividerWidth, dividerHeight); }public DividerItemDecoration2(@NonNull Drawable horizontalDivider, @NonNull Drawable verticalDivider, int dividerWidth, int dividerHeight) { mHorizontalDivider = horizontalDivider; mVerticalDivider = verticalDivider; mDividerWidth = dividerWidth; mDividerHeight = dividerHeight; }@Override public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { if (mUnderLayerOrientation == GridLayoutManager.HORIZONTAL) { drawHorizontal(c, parent, state); drawVertical(c, parent, state); } else { drawVertical(c, parent, state); drawHorizontal(c, parent, state); } }private void drawHorizontal(Canvas c, RecyclerView parent, RecyclerView.State state) { int left; int right; int top; int bottom; final int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { final View child = parent.getChildAt(i); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams(); left = child.getRight() + params.rightMargin; right = left + mDividerWidth; top = child.getTop(); bottom = child.getBottom() + mDividerHeight; mHorizontalDivider.setBounds(left, top, right, bottom); mHorizontalDivider.draw(c); } }private void drawVertical(Canvas c, RecyclerView parent, RecyclerView.State state) { int left; int right; int top; int bottom; final int childCount = parent.getChildCount(); for (int i = 0; i < childCount-1; i++) { final View child = parent.getChildAt(i); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams(); top = child.getBottom() + params.bottomMargin; bottom = top + mDividerHeight; left = child.getLeft(); right = child.getRight() + mDividerWidth; mVerticalDivider.setBounds(left, top, right, bottom); mVerticalDivider.draw(c); } }@Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { super.getItemOffsets(outRect, view, parent, state); if (getOrientation(parent) == GridLayoutManager.VERTICAL) { getVerticalItemOffsets(outRect, view, parent, state); } else { getHorizontalItemOffsets(outRect, view, parent, state); } }private void getVerticalItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { int position = parent.getChildAdapterPosition(view); int spanCount = getSpanCount(parent); GridLayoutManager gridLayoutManager = (GridLayoutManager) parent.getLayoutManager(); outRect.top = 0; if (isAllowShowDivider(position, parent)) { outRect.bottom = mDividerHeight; } else { outRect.bottom = 0; }int parentWidth = parent.getWidth(); //每个item实际显示的宽度 int itemContentWidth = (parentWidth - (spanCount - 1) * mDividerWidth) / spanCount; //每个item中预留出的边距总宽度,可能是单边有边距，可能是双边有边距 int itemSpacingWidth = parentWidth / spanCount - itemContentWidth; int spanIndex = gridLayoutManager.getSpanSizeLookup().getSpanIndex(position, spanCount); outRect.left = spanIndex * (mDividerWidth - itemSpacingWidth); int realItemIndexInGroup = spanIndex + gridLayoutManager.getSpanSizeLookup() .getSpanSize(position) - 1; //算上跨度的index outRect.right = (realItemIndexInGroup + 1) * itemSpacingWidth - realItemIndexInGroup * mDividerWidth; }private void getHorizontalItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { int position = parent.getChildAdapterPosition(view); int spanCount = getSpanCount(parent); GridLayoutManager gridLayoutManager = (GridLayoutManager) parent.getLayoutManager(); outRect.left = 0; if (isAllowShowDivider(position, parent)) { outRect.right = mDividerWidth; } else { outRect.right = 0; }int parentHeight = parent.getHeight(); //每个item实际显示的宽度 int itemContentHeight = (parentHeight - (spanCount - 1) * mDividerHeight) / spanCount; //每个item中预留出的边距总宽度,可能是单边有边距，可能是双边有边距 int itemSpacingHeight = parentHeight / spanCount - itemContentHeight; int spanIndex = gridLayoutManager.getSpanSizeLookup().getSpanIndex(position, spanCount); outRect.top = spanIndex * (mDividerHeight - itemSpacingHeight); int realItemIndexInGroup = spanIndex + gridLayoutManager.getSpanSizeLookup() .getSpanSize(position) - 1; //算上跨度的index //int realItemIndexInGroup = position % mSpanCount; outRect.bottom = (realItemIndexInGroup + 1) * itemSpacingHeight - realItemIndexInGroup * mDividerHeight; }/** * 是否在最后一行/列 * * @param position * @param parent * @return */ private boolean isInLastGroup(int position, RecyclerView parent) { int spanCount = getSpanCount(parent); GridLayoutManager gridLayoutManager = (GridLayoutManager) parent.getLayoutManager(); GridLayoutManager.SpanSizeLookup spanSizeLookup = gridLayoutManager.getSpanSizeLookup(); return spanSizeLookup.getSpanGroupIndex(parent.getAdapter().getItemCount() - 1, spanCount) == spanSizeLookup.getSpanGroupIndex(position, spanCount); }/** * 得到总共多少行/列 * * @param parent * @return */ private int getGroupCount(RecyclerView parent) { if (parent == null || parent.getLayoutManager() == null || parent.getAdapter() == null) { return 0; } if (parent.getAdapter().getItemCount() == 0) { return 0; } GridLayoutManager gridLayoutManager = (GridLayoutManager) parent.getLayoutManager(); return gridLayoutManager.getSpanSizeLookup().getSpanGroupIndex(parent.getAdapter() .getItemCount() - 1, getSpanCount(parent)) + 1; }private int getOrientation(RecyclerView parent) { checkLayoutManager(parent); return ((GridLayoutManager) parent.getLayoutManager()).getOrientation(); }private int getSpanCount(RecyclerView parent) { checkLayoutManager(parent); return ((GridLayoutManager) parent.getLayoutManager()).getSpanCount(); }private void checkLayoutManager(RecyclerView parent) { if (parent.getLayoutManager() == null) { throw new NullPointerException("Must set LayoutManager to RecyclerView"); } if (!(parent.getLayoutManager() instanceof GridLayoutManager)) { throw new IllegalArgumentException("Invalid LayoutManager for this ItemDecoration, " + "please set GridLayoutManager."); } }/** * 子类可控制是否显示分割 * * @param position * @param parent * @return */ protected boolean isAllowShowDivider(int position, RecyclerView parent) { if (isInLastGroup(position, parent)) { //末尾不显示分割 return false; } return true; }/** * 横向还是纵向的分割线在下，因为有重叠部分 * * @param orientation */ public void setUnderLayer(int orientation) { mUnderLayerOrientation = orientation; }}

2.直接调用