仅在可展开项内展开一项而不折叠

Question

我有一个抽屉，里面有多个可扩展的项目，例如 "main1"（可扩展的项目）在里面 "main2-1"，"main2-2"，"main2-3"（可扩展的item) inside "main3-1","main3-2","main3-3" (normal item)

我只想让 "main2" 级别的一个 ExpandedItem (main2-1, 2-1, 2-3) 也处于"main1"

的水平

我试过 result.getAdapter().withOnlyOneExpandedItem(true);，其中 "result" 是我正在使用的抽屉库 - 它不起作用，因为折叠 "main2" 关卡而不是展开关卡的第一项

此外，this 方法在第三次点击不同的可扩展项时不起作用 - 我在代码后面加上日志记录以确保应用程序进入它，但它不会折叠前一个

if(previousExpandableItemPosition != position) {
   result.getAdapter().collapse(previousExpandableItemPosition);
   previousExpandableItemPosition = position;
}

Answer 1

我制作了一个方法，我将其放置在扩展项的 onClick 中，我只想扩展其中一个，这是为了帮助其他任何人

if (position != previousPosition && previousPosition != 0 && previousIdentifier != drawerItem.getIdentifier()) { // WithOnlyOneExpandableItem
                                IDrawerItem itemx = result.getAdapter().getItem(previousPosition);
                                if (itemx.isExpanded()) {
                                    itemx.withIsExpanded(true);
                                    result.updateItem(itemx);
                                } else {
                                    if(previousPosition > position){ // user is going upward
                                        itemx = result.getAdapter().getItem(previousPosition + result.getAdapter().getItem(position).getSubItems().size());
                                        if (itemx.isExpanded()) {
                                            itemx.withIsExpanded(true);
                                            result.updateItem(itemx);
                                        }else{Log.i("ppppppppppppp", String.valueOf(previousPosition + (previousPosition - position)));}

                                    }else if(previousPosition > position){ // user is going downward
                                        itemx = result.getAdapter().getItem(previousPosition + (previousPosition
                                                + result.getAdapter().getItem(previousPosition).getSubItems().size()));
                                        if (itemx.isExpanded()) {
                                            itemx.withIsExpanded(true);
                                            result.updateItem(itemx);
                                        }else{Log.i("ppppppppppppp", String.valueOf(previousPosition + (previousPosition - position)));}
                                    }
                                }
                            } else if (previousPosition != 0 && previousIdentifier == drawerItem.getIdentifier()) {
                                //if the drawer item is collapsed after expanding then deselect it
                                EnterTimes++;
                                if(!result.getAdapter().getItem(position).isExpanded()){
                                    EnterTimes=1;
                                }
                                if(EnterTimes <2){
                                    result.getAdapter().getItem(position).withSetSelected(false);
                                    result.updateItem(drawerItem);
                                }
                            }
                            previousIdentifier = (int) drawerItem.getIdentifier();
                                previousPosition = position;

在onCreate之前int previousPosition = 0, previousIdentifier = 0;

仅在可展开项内展开一项而不折叠

Expand one item only inside expandable item without being collapsed

expand

android

expandablelistadapter