ExpandableListview OnGroupClickListener 未触发

Question

我正在关注这个：Programmatically collapse a group in ExpandableListView。我希望用户一次只能扩展一个组并平滑滚动到正确的位置。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，onGroupClick 事件从未被触发...（我在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...
    });
}

这个替代方案的结果相同...有什么想法吗？

Answer 1

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() {

与new 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;
            }
        });