Question

我有一个Android应用程序，用自定义适配器填充列表视图。此适配器将带有标题的部分添加到列表视图中。该适配器如下所示：

public class SeparatedListAdapter extends BaseAdapter {  

    public final Map<String,Adapter> sections = new LinkedHashMap<String,Adapter>();  
    public final ArrayAdapter<String> headers;  
    public final static int TYPE_SECTION_HEADER = 0;        

    public SeparatedListAdapter(Context context) {  
        headers = new ArrayAdapter<String>(context, R.layout.list_header);
    }

    public void addSection(String section, Adapter adapter) {  
        this.headers.add(section);  
        this.sections.put(section, adapter);
    }

    public Object getItem(int position) {  
        for(Object section : this.sections.keySet()) {  
            Adapter adapter = sections.get(section);  
            int size = adapter.getCount() + 1;  

            // check if position inside this section   
            if(position == 0) return section;  
            if(position < size) return adapter.getItem(position - 1);  

            // otherwise jump into next section  
            position -= size;  
        }  
        return null;  
    }  

    public int getCount() {  
        // total together all sections, plus one for each section header  
        int total = 0;  
        for(Adapter adapter : this.sections.values())  
            total += adapter.getCount() + 1;  
        return total;  
    }  

    public int getViewTypeCount() {  
        // assume that headers count as one, then total all sections  
        int total = 1;  
        for(Adapter adapter : this.sections.values())  
            total += adapter.getViewTypeCount();  
        return total;  
    }  

    public int getItemViewType(int position) {  
        int type = 1;  
        for(Object section : this.sections.keySet()) {  
            Adapter adapter = sections.get(section);  
            int size = adapter.getCount() + 1;  

            // check if position inside this section   
            if(position == 0) return TYPE_SECTION_HEADER;  
            if(position < size) return type + adapter.getItemViewType(position - 1);  

            // otherwise jump into next section  
            position -= size;  
            type += adapter.getViewTypeCount();  
        }  
        return -1;  
    }  

    public boolean areAllItemsSelectable() {  
        return false;  
    }  

    public boolean isEnabled(int position) {  
        return (getItemViewType(position) != TYPE_SECTION_HEADER);  
    }  

    @Override  
    public View getView(int position, View convertView, ViewGroup parent) {  
        int sectionnum = 0;  
        for(Object section : this.sections.keySet()) {  
            Adapter adapter = sections.get(section);  
            int size = adapter.getCount() + 1;  

            // check if position inside this section   
            if(position == 0) return headers.getView(sectionnum, convertView, parent);  
            if(position < size) return adapter.getView(position - 1, convertView, parent);  

            // otherwise jump into next section  
            position -= size;  
            sectionnum++;  
        }  
        return null;  
    }  

    @Override  
    public long getItemId(int position) {  
        return position;  
    }  

}

然后通过以下代码调用：

SeparatedListAdapter adapter;

    public Map<String,?> createItem(String name) {  
        Map<String,String> item = new HashMap<String,String>();  
        item.put(ITEM_VALUE, name);
        return item;
    } 

List<Map<String,?>> item = new LinkedList<Map<String,?>>();
item.add(createItem("value"));
adapter.addSection("Header", new SimpleAdapter(this, item, R.layout.list_item, new String[] { "value" }, new int[] { R.id.lblValue }));
listview.setAdapter(adapter);

直到最近，我的list_header xml文件都有一个TextView根元素。在这一点上它完美地运作。但后来我想扩展标题以包含多个视图。 list_header的新根元素现在是RelativeLayout。

现在，当我尝试启动活动时，我收到以下异常：IllegalStateException: ArrayAdapter requires the resource ID to be a Text View。我理解错误，但由于我对Android比较新，我不确定如何解决这个问题。如何修改我的适配器以处理包含RelativeLayout作为根元素的标头，而不是TextView？

编辑：我相信答案在于适配器的构造函数方法吗？

Answer 1

编辑：我相信答案在于构造函数方法适配器？

准确地说，您应该使用this one：

headers = new ArrayAdapter<String>(context, R.layout.list_header, R.id.the_id_of_textview);

另外，请查看this answer。

在listview中使用复杂的页眉布局

1 个答案: