Question

我正在关注此事：Programmatically collapse a group in ExpandableListView。我希望用户能够一次只扩展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onGroupClick事件永远不会被触发...（我在方法中放了一些日志）。我也试过了：

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......任何想法？

Answer 1

我建议您先检查导入（未在问题中显示），并确保已导入android.widget.ExpandableListView.OnGroupClickListener

或替换：new OnGroupClickListener() {

new android.widget.ExpandableListView.OnGroupClickListener {

编辑：

我还注意到你在boolean onGroupClick(...)的正文中返回“true”，表示“处理了点击”，并且群组永远不会折叠，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;
            }
        });

ExpandableListview OnGroupClickListener未触发

1 个答案: