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
recyclerview.addItemDecoration(new DividerItemDecoration2(this,R.drawable.item_style,R.dimen.alphabet_size2));
第二个参数是你自定义的分割线样式
这是我项目中用到的
第三个参数为分割线的宽度，自己设置一下即可。