recyclerview浮动item实现
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- 使用（支持两种模式）
- 指定浮动position可以多个，适用于多类型item的浮动
- 指定浮动viewtype，适用于单类型多item的浮动
container是用于显示浮动view的容器，我测试是直接加到recyclerview的framelayout父布局
#1
floatInterface = new PositionFloatView(container, 11, 21, 36,38);
floatInterface.attachRecyclerview(recyclerView1);
>
#2
floatInterface = new ViewTypeFloatView(container, 0);
- 实现 通过监听recyclerview的滑动，调用adapter的creatviewholder 和bindviewholder产生需要浮动的view添加到根布局
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
int firstcompletevisable = getFirstcompletevisable(recyclerView);
/**
* {@link type=0 定了itemtype 1 定了position}
* 启动子线程，一次计算10万内的type position 分段1000个记录一个标记位置用于优化查找
* 超过计算位置，重启线程计算
*/
int currentnearestposition = -1;
if (type == 0) {
return;
} else {
if (firstcompletevisable > arrays.get(arrays.size() - 1)) {
/**
* 继续计算
*/
thread.start();
type = 0;
return;
}
int mark = arrays.size() - 1;
int size = marks.size();
for (int i = 0; i < size; i++) {
if (marks.valueAt(i) > firstcompletevisable) {
mark = marks.keyAt(i);
break;
}
}
for (int i1 = mark; i1 >= 0; i1--) {
Integer integer = arrays.get(i1);
if (integer < firstcompletevisable) {
currentnearestposition = integer;
break;
}
}
}
/**
* 如果没有要悬浮的了，并且有悬浮过就隐藏掉
*/
if (currentnearestposition == -1 && viewHolder != null) {
viewHolder.itemView.setVisibility(View.GONE);
currentfloatposition = -1;
return;
}
/**
* {@link crashmove}从一个悬浮view过渡到另一个的移动动画
*/
if (crashmove && viewHolder != null) {
View childAt = recyclerView.getChildAt(firstcompletevisable == getFirstvisable(recyclerView) ? 0 : 1);
if (firstcompletevisable != -1 && adapter.getItemViewType(firstcompletevisable) == viewtype && childAt.getTop() <= viewHolder.itemView.getHeight()) {
int height = viewHolder.itemView.getHeight();
int top = height - childAt.getTop();
if (top >= 0 && top <= height) {
viewHolder.itemView.setTranslationY(-top);
}
} else {
viewHolder.itemView.setTranslationY(0);
}
}
/**
* 如果当前悬浮和需要悬浮的相等，不必做改动
*/
if (currentnearestposition == currentfloatposition) {
return;
}
if (currentfloatposition == firstcompletevisable && firstcompletevisable == getFirstvisable(recyclerView)) {
return;
}
/**
* 如果没有创建过，创建
* 创建过，绑定新的数据
*/
if (viewHolder == null) {
viewHolder = adapter.createViewHolder(recyclerView, viewtype);
container.addView(viewHolder.itemView);
} else {
viewHolder.itemView.setVisibility(View.VISIBLE);
}
currentfloatposition = currentnearestposition;
if (listener != null) {
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listener.onClick(v, currentfloatposition);
}
});
}
adapter.onBindViewHolder(viewHolder, currentfloatposition);
}
public int getFirstcompletevisable(RecyclerView recyclerView) {
return RecyclerviewFloatHelper.getFirstcompletevisable(recyclerView);
}
public int getFirstvisable(RecyclerView recyclerView) {
return RecyclerviewFloatHelper.getFirstvisable(recyclerView);
}
int MAX_PERIOD = 100000;
SparseArray<Integer> marks = new SparseArray<>();
int mark = 0;
@Override
public void run() {
System.out.println("所有type位置开始部分获取");
int size = arrays.size();
int i = 0;
if (size > 0) {
i = arrays.get(size - 1);
}
int end = MAX_PERIOD + i;
for (; i < end && i < itemCount; i++) {
if (adapter.getItemViewType(i) == viewtype) {
arrays.add(i);
if (i / 100 == mark) {
marks.put(arrays.size() - 1, i);
mark++;
}
}
}
System.out.println("共" + mark + "个标记位置");
System.out.println("所有type位置获取完毕");
type = 1;
}
