Question

我根据许多教程和SO的一些错误问题制作了一个ExpandableListView。父列表由两个TextView和一个带有标准布局的ImageButton组成。子列表由单个TextView组成。数据源来自活动的SQLite数据库，并生成到ArrayList。

问题：

不知何故，即使按钮工作正常，父组列表也能正常工作，但是当我尝试扩展时，它不会扩展。所以我尝试在打开活动之后放一些Toast消息，但看起来getChildView()方法根本没有触发，因为Toast消息根本没有显示。

ExpandableListAdapter类就像这样

public class InventoryListExpandableListAdapter extends BaseExpandableListAdapter {

    private Context context;
    private ArrayList<Inventory> data;
    private HashMap<String, ArrayList<String>> list_data;

    public InventoryListExpandableListAdapter(Context context, ArrayList<Inventory> data, HashMap<String, ArrayList<String>> list_data) {
        this.context = context;
        this.data = data;
        this.list_data = list_data;
    }

    @Override
    public int getGroupCount() {return data.size();}

    @Override
    public int getChildrenCount(int groupPosition) {return list_data.get(data.get(groupPosition)).size();}

    @Override
    public Inventory getGroup(int groupPosition) {return data.get(groupPosition);}

    @Override
    public Object getChild(int groupPosition, int childPosition) {return list_data.get(data.get(groupPosition).getCode()).get(childPosition);}

    @Override
    public long getGroupId(int groupPosition) {return groupPosition;}

    @Override
    public long getChildId(int groupPosition, int childPosition) {return childPosition;}

    @Override
    public boolean hasStableIds() {return true;}

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        if (convertView == null) {
            final Inventory inventory = getGroup(groupPosition);

            convertView = View.inflate(context, R.layout.listview_layout_two_row_delete, null);
            ImageButton btnDelete = (ImageButton)convertView.findViewById(R.id.btnDelete);
            TextView text1 = (TextView)convertView.findViewById(R.id.text1);
            TextView text2 = (TextView)convertView.findViewById(R.id.text2);

            text1.setText(inventory.getCode());
            text2.setText(inventory.getItem());

            btnDelete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(context, "DELETED", Toast.LENGTH_SHORT).show();
                }
            });
        }
        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        final String childText = (String)getChild(groupPosition, childPosition);
        LayoutInflater infalInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if (convertView == null) {
            convertView = infalInflater.inflate(R.layout.listview_layout_single_text, null);
        }
        Toast.makeText(context, "Make Child number "+String.valueOf(childPosition), Toast.LENGTH_SHORT).show();

        TextView text1 = (TextView)convertView.findViewById(R.id.text1);
        text1.setText(childText);
        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

}

感谢您提供的任何帮助。谢谢。

Answer 1

我花了好几个小时试图找到同样的问题，只是意识到这对我来说很简单：

您在GroupView中有一个ImageButton，它会拦截触摸以展开视图。用它来修复它：

机器人：可聚焦= “假” 机器人：focusableInTouchMode = “假”

由于组视图未展开，因此没有理由浪费CPU周期来获取不会显示的视图。
不调用适配器中与子项相关的所有方法。

尝试调用expandableListView.expandGroup（0 ... n）手动展开它，看看它是否调用了适配器中与子项相关的方法

Answer 2

我发现了一种不同的方法让getChildView（）在ExpandedListAdapter类中没有自动调用时被调用。它是一个似乎可以解决问题的快捷方式。我有一个扩展列表视图，父组项是复选框列表。单击复选框可显示子项。这是我编写getGroupView（）函数的方式。

@Override
public View getGroupView(final int groupPosition, final boolean isExpanded, View convertView, final ViewGroup viewGroup)
{
    if (convertView == null)
    {
        LayoutInflater inflater = (LayoutInflater) m_context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.expandable_list_milk_type,null);
    }
    final CheckBox cbMilkType = (CheckBox) convertView.findViewById(R.id.cb_milk_type);
    cbMilkType.setText(m_listMilktype.get(groupPosition));

    cbMilkType.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            ExpandableListView expandableListView = (ExpandableListView)viewGroup;
            cbMilkType.toggle();
            if (!isExpanded) {
                expandableListView.expandGroup(groupPosition);
            }
            else {
                expandableListView.collapseGroup(groupPosition);
            }
        }
    });
    return convertView;
}

Answer 3

更改hasStableIds方法

  @Override
    public boolean hasStableIds() {return false;}

**请更改你的getGroupView方法:: **

 @Override
 public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        if (convertView == null) {
            final Inventory inventory = getGroup(groupPosition);

            convertView = View.inflate(context, R.layout.listview_layout_two_row_delete, null);
            }
            ImageButton btnDelete = (ImageButton)convertView.findViewById(R.id.btnDelete);
            TextView text1 = (TextView)convertView.findViewById(R.id.text1);
            TextView text2 = (TextView)convertView.findViewById(R.id.text2);

            text1.setText(inventory.getCode());
            text2.setText(inventory.getItem());

            btnDelete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(context, "DELETED", Toast.LENGTH_SHORT).show();
                }
            });

        return convertView;
    }

Android ExpandableListView getChildView未触发

3 个答案: