if (collapseGroup(position)) { if (collapseListener != null) { collapseListener.onGroupCollapse(position, fromUser, null);
/*package*/ boolean collapseGroup(int groupPosition, boolean fromUser, Object payload) { if (!mPositionTranslator.isGroupExpanded(groupPosition)) { return false; } // call hook method if (!mExpandableItemAdapter.onHookGroupCollapse(groupPosition, fromUser, payload)) { return false; } if (mPositionTranslator.collapseGroup(groupPosition)) { final long packedPosition = ExpandableAdapterHelper.getPackedPositionForGroup(groupPosition); final int flatPosition = mPositionTranslator.getFlatPosition(packedPosition); final int childCount = mPositionTranslator.getChildCount(groupPosition); notifyItemRangeRemoved(flatPosition + 1, childCount); } { final long packedPosition = ExpandableAdapterHelper.getPackedPositionForGroup(groupPosition); final int flatPosition = mPositionTranslator.getFlatPosition(packedPosition); notifyItemChanged(flatPosition, payload); } // raise onGroupCollapse() event if (mOnGroupCollapseListener != null) { mOnGroupCollapseListener.onGroupCollapse(groupPosition, fromUser, payload); } return true; }