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我正在关注这个：以编程方式折叠 ExpandableListView 中的组。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...
    });
}

这种替代方案的结果相同......有什么想法吗？

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1 回答 1

4

我建议您先检查进口（未在您的问题中显示），并确保您已进口android.widget.ExpandableListView.OnGroupClickListener

或更换：new OnGroupClickListener() {

和new android.widget.ExpandableListView.OnGroupClickListener {

编辑 ：

我还注意到您在正文中返回“true”，boolean onGroupClick(...) 这意味着“点击已处理”，并且组永远不会被折叠、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;
            }
        });
于 2013-08-17T18:04:48.557 回答