ExpandableListview OnGroupClickListener没有发射 [英] ExpandableListview OnGroupClickListener Not Firing

问题描述

我跟随这名：<一href=\"http://stackoverflow.com/questions/4314777/programmatically-collapse-a-group-in-expandablelistview\">Programmatically在倒塌 ExpandableListView一组。我希望能够在用户在同一时间展开只有一组，顺利滚动到合适的位置。我已经写了一个实现OnGroupClickListener自定义适配器：

I'm following this: Programmatically collapse a group in ExpandableListView. I want the user capable to expand only one group at a time and smoothly scroll to the right position. I've written a custom adapter that implements OnGroupClickListener:

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，onGroupClick事件从来没有发射。（我已经把一些日志的方法内）。我也试过：

Unfortunately the onGroupClick event is never fired...(I've put some logs inside the method). I've also tried:

expListView.setOnGroupClickListener(new OnGroupClickListener() {
    @Override
    public boolean onGroupClick(ExpandableListView parent, View view, int groupPosition, long id) {
        // Same as above...
    });
}

对于这种替代的结果相同...任何想法？

Same results for this alternative...any ideas?

推荐答案

我会建议您检查进口第一个（在你的问题未显示），并确保您已导入 android.widget .ExpandableListView.OnGroupClickListener

I would suggest you to check for the imports first (not shown in your question),and make sure you have imported android.widget.ExpandableListView.OnGroupClickListener

或更换：新OnGroupClickListener（）{

与新android.widget.ExpandableListView.OnGroupClickListener {

编辑：

我也注意到，您在布尔onGroupClick（...），表示点击被处理的身体返回真和组决不会倒塌，扩大了。

I also noticed that you are returning 'true' at the body of boolean onGroupClick(...) that means "the click was handled" and groups will never be collapsed, expanded.

如果你想expand.So，我建议你做这样你应该返回false：

You should return false if you want to expand.So I suggest you to do like this :

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;
            }
        });

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