實(shí)現(xiàn)這個(gè)的思路,我們只需要在指定的的行數(shù)通過getItemOffsets預(yù)留出我們要空出的高度,然后通過onDrawOver繪制出你所希望的view即可。
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一:手動(dòng)構(gòu)造數(shù)據(jù)格式,如下,返回list
Goods goods1 = new Goods("人氣TOP", "正果拿鐵1", "Y27", "默認(rèn):大/單糖/熱");
Goods goods99 = new Goods("人氣TOP", "正果拿鐵2", "Y27", "默認(rèn):大/單糖/熱");
Goods goods91 = new Goods("人氣TOP", "正果拿鐵3", "Y27", "默認(rèn):大/單糖/熱");
Goods goods2 = new Goods("大師咖啡", "拿鐵", "Y27", "默認(rèn):大/單糖/熱");
Goods goods3 = new Goods("大師咖啡", "香草拿鐵", "Y24", "默認(rèn):大/單糖/熱");
Goods goods4 = new Goods("大師咖啡", "焦糖拿鐵", "Y26", "默認(rèn):大/半糖/熱");
List<Goods> list = new ArrayList<>();
二:書寫自己的ItemDecoration
第一個(gè)必須預(yù)留,當(dāng)前位置的name和前一個(gè)不相等則為預(yù)留空間
@Override
public boolean isParent(int position) {
if (position == 0) return true;
if (!list.get(position).getType().equals(list.get(position - 1).getType()))
return true;
return false;
}
//是否為當(dāng)前最后一個(gè)item
protected boolean lastOneInGroup(int position) {
String parentName = mDecorListener.parentName(position);
String nextGroupName;
try {
nextGroupName = mDecorListener.parentName(position + 1);
} catch (Exception e) {
nextGroupName = null;
}
if (nextGroupName == null) {
return false;
}
return !TextUtils.equals(parentName, nextGroupName);//與下一行的name不一樣說明當(dāng)前是最后一行
}
由上isParent判斷是第一個(gè)的返回你要預(yù)留的高度大小,否則為不需要空間0
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
int position = parent.getChildAdapterPosition(view);
if (parent.getLayoutManager() instanceof LinearLayoutManager && mDecorListener.isParent(position)) {
outRect.top = decorationHeight;
return;
}
outRect.top = 0;
}
@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
super.onDrawOver(c, parent, state);
final int itemCount = state.getItemCount(); 全部item的數(shù)量
final int childCount = parent.getChildCount(); 可看見的排除懸停的分割線的個(gè)數(shù)
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
for (int i = 0; i < childCount; i++) {
View childView = parent.getChildAt(i);
int position = parent.getChildAdapterPosition(childView);//就是當(dāng)前可見每一行的position,從0開始
//默認(rèn)第一個(gè)就是有個(gè)Group
if (mDecorListener.isParent(position) || i == 0) {//中第一個(gè)位置和可見的第一個(gè)才有這個(gè)懸停
//繪制懸浮,
int bottom = Math.max(decorationHeight, (childView.getTop() + parent.getPaddingTop()));
//決定當(dāng)前頂部第一個(gè)懸浮Group的bottom,拿到item高度和規(guī)定高度對(duì)比,只是選擇一個(gè)合適的高度定義分割線
if (position + 1 < itemCount) {
//下一組的第一個(gè)View接近頭部
int viewBottom = childView.getBottom();
if (lastOneInGroup(position) && viewBottom < bottom) {
bottom = viewBottom; //如果這個(gè)關(guān)掉,會(huì)覆蓋,頂上去效果失去,其實(shí)viewBottom逐漸變?yōu)?,這樣動(dòng)態(tài)的放置即將消失的懸浮攔,看上去就是下一個(gè)懸浮攔頂上來的
}
}
drawDecoration(c, position, left, right, bottom, parent);
stickyHeaderPosArray.put(position, bottom);
}
}
}
private void drawDecoration(Canvas c, int position, int left, int right, int bottom, RecyclerView parent) {
c.drawRect(left, bottom - decorationHeight, right, bottom, mGroutPaint);
Paint.FontMetrics fm = mTextPaint.getFontMetrics();
//文字豎直居中顯示
float baseLine = bottom - (decorationHeight - (fm.bottom - fm.top)) / 2 - fm.bottom;
//獲取文字寬度
mSideMargin = Math.abs(mSideMargin);
c.drawText(mDecorListener.parentName(position), left + mSideMargin, baseLine, mTextPaint);//x軸,baseLine
Rect rect = new Rect();//為了得到當(dāng)前text的屬性
mTextPaint.getTextBounds(mDecorListener.parentName(position), 0, mDecorListener.parentName(position).length(), rect);
//繪制那條橫線
c.drawLine(left + mSideMargin * 2 + rect.width(), baseLine - rect.height() / 2, parent.getWidth() -
mSideMargin, baseLine - rect.height() / 2, mTextPaint);
}
完結(jié)
分享標(biāo)題:Recycleview模仿瑞幸咖啡菜單物品列表
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