自定义ExpandableListView以在此时仅显示一个“展开”的项目,可以通过以下步骤实现:
下面是一个示例代码:
public class CustomExpandableListView extends ExpandableListView {
private int lastExpandedGroupPosition = -1;
public CustomExpandableListView(Context context) {
super(context);
}
public CustomExpandableListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomExpandableListView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Measure spec for the ListView height
int listViewHeight = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, listViewHeight);
}
@Override
public void expandGroup(int groupPos) {
super.expandGroup(groupPos);
lastExpandedGroupPosition = groupPos;
}
@Override
public void collapseGroup(int groupPos) {
super.collapseGroup(groupPos);
lastExpandedGroupPosition = -1;
}
@Override
public void onGroupExpand(int groupPosition) {
if (lastExpandedGroupPosition != -1 && groupPosition != lastExpandedGroupPosition) {
collapseGroup(lastExpandedGroupPosition);
}
super.onGroupExpand(groupPosition);
}
@Override
public void onGroupCollapse(int groupPosition) {
super.onGroupCollapse(groupPosition);
lastExpandedGroupPosition = -1;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
int x = (int) ev.getX();
int y = (int) ev.getY();
int position = pointToPosition(x, y);
if (position != INVALID_POSITION && getExpandableListAdapter().getChildrenCount(position) > 0) {
if (isGroupExpanded(position)) {
collapseGroup(position);
} else {
expandGroup(position);
}
return true;
}
}
return super.dispatchTouchEvent(ev);
}
}
使用CustomExpandableListView替代原生的ExpandableListView,即可实现在此时仅显示一个“展开”的项目的效果。
这是一个自定义的ExpandableListView,它通过重写相关方法和处理点击事件,实现了只展开一个子项的功能。你可以根据自己的需求进行修改和扩展。
腾讯云相关产品中,没有直接对应ExpandableListView的产品,但可以使用腾讯云的云服务器(CVM)和云数据库(CDB)等产品来搭建和管理后端服务,使用腾讯云的CDN加速服务来提高前端页面的加载速度。具体产品介绍和使用方法可以参考腾讯云官方文档:腾讯云产品文档。
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