我正在关注:Programmatically collapse a group in ExpandableListView .我希望用户一次只能展开一个组并平滑地滚动到正确的位置。我编写了一个实现 OnGroupClickListener 的自定义适配器:
public class CategoriesListAdapter extends BaseExpandableListAdapter implements OnGroupClickListener {
private ExpandableListView expListView;
private int lastExpandedGroupPosition = -1;
// I get the expListView in the constructor...
@Override
public boolean onGroupClick(ExpandableListView parent, View view, int groupPosition, long id) {
parent.smoothScrollToPosition(groupPosition);
if (parent.isGroupExpanded(groupPosition)) {
parent.collapseGroup(groupPosition);
} else {
parent.expandGroup(groupPosition);
}
return true;
}
@Override
public void onGroupExpanded(int groupPosition) {
if (groupPosition != lastExpandedGroupPosition) {
expListView.collapseGroup(lastExpandedGroupPosition);
}
super.onGroupExpanded(groupPosition);
lastExpandedGroupPosition = groupPosition;
}
}
不幸的是,永远不会触发 onGroupClick 事件...(我在该方法中放置了一些日志)。我也试过:
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View view, int groupPosition, long id) {
// Same as above...
});
}
此替代方案的结果相同...有什么想法吗?
最佳答案
我建议您先检查导入(未在您的问题中显示),并确保您已导入 android.widget.ExpandableListView.OnGroupClickListener
或替换:new OnGroupClickListener() {
使用 新的 android.widget.ExpandableListView.OnGroupClickListener {
编辑:
我还注意到您在 boolean onGroupClick(...)
的正文中返回“true”,这意味着“点击已处理”并且组永远不会折叠、展开。
如果你想扩展你应该返回false。所以我建议你这样做:
expListView.setOnGroupClickListener(new OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
Log.d("onGroupClick:", "worked");
parent.smoothScrollToPosition(groupPosition);
if (parent.isGroupExpanded(groupPosition)) {
parent.collapseGroup(groupPosition);
} else {
parent.expandGroup(groupPosition);
}
return false;
}
});
关于android - ExpandableListview OnGroupClickListener 未触发,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18291612/