安卓导航抽屉菜单：如何可​​折叠导航项目 [英] Android: Navigation Drawer SubMenu: How to Collapsible navigation items

问题描述

我有一个抽屉式导航10选项 选项​​＃5 shoudl有另外7个选项中某种即展开/可折叠的（如子菜单）

如何创建一个可折叠的导航项目就像是这里描述： <一href="http://developer.android.com/design/patterns/navigation-drawer.html#Content">http://developer.android.com/design/patterns/navigation-drawer.html#Content

解决方案

下面是一个示例应用程序，这使得它：

  

PrashamTrivedi / DrawerLayoutTest

  @覆盖
    公共查看getGroupView（INT groupPosition，布尔isExpanded，查看convertView，父母的ViewGroup）
    {
        如果（convertView == NULL）
        {
            LayoutInflater layoutInflater =（LayoutInflater）context.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
            convertView = layoutInflater.inflate（R.layout.drawer_group_item，父母，假）;
        }

        （（TextView中）convertView）.setText（groupItem.get（groupPosition））;
        convertView.setTag（groupItem.get（groupPosition））;
        返回convertView;
    }
 

---

  @覆盖
    公共查看getChildView（INT groupPosition，最终诠释childPosition，布尔isLastChild，查看convertView，父母的ViewGroup）
    {
        tempChild =（ArrayList的＆LT;字符串＆GT;）children.get（groupPosition）;
        TextView的文本= NULL;

        如果（convertView == NULL）
        {
            LayoutInflater layoutInflater =（LayoutInflater）context.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
            convertView = layoutInflater.inflate（R.layout.drawer_submenu_item，父母，假）;
        }

        文=（TextView的）convertView;
        text.setText（tempChild.get（childPosition））;

        convertView.setTag（tempChild.get（childPosition））;
        返回convertView;
}
 

而你必须创建布局文件夹中的新的XML文件（提示的：创建两种，一种为组视图和其他的子菜单）

所有经过你身边的导航必须看起来像如下：

I have a Navigation Drawer with 10 options Option #5 shoudl have another 7 options (like a sub menu) of some sort that is expandable/collapsible

How do I create a "Collapsible navigation items" like it is described here: http://developer.android.com/design/patterns/navigation-drawer.html#Content

解决方案

Here is a sample application which makes it:

PrashamTrivedi / DrawerLayoutTest

@Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent)
    {
        if (convertView == null)
        {
            LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(R.layout.drawer_group_item,parent,false);
        }

        ((TextView) convertView).setText(groupItem.get(groupPosition));
        convertView.setTag(groupItem.get(groupPosition));
        return convertView;
    }

---

@Override
    public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent)
    {
        tempChild = (ArrayList<String>) children.get(groupPosition);
        TextView text = null;

        if (convertView == null)
        {
            LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(R.layout.drawer_submenu_item,parent,false);
        }

        text = (TextView) convertView;
        text.setText(tempChild.get(childPosition));

        convertView.setTag(tempChild.get(childPosition));
        return convertView;
}

And you have to create the new xml files in the layout folder (hint: create two, one for the group view and other for the submenu)

After all your side navigation must look like as below:

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