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我有一個Android應用程序,它使用自定義適配器填充列表視圖。該適配器將部分添加到帶有標題的列表視圖。該適配器如下圖所示:在列表視圖中使用複雜的頁眉佈局
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;
}
}
,然後通過下面的代碼名爲:
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);
現在直到最近,我list_header
xml文件有TextView
根元素。此時它完美地工作。但後來我想擴展標題以包含多個視圖。 list_header
的新根元素現在是RelativeLayout
。
現在,當我嘗試啓動活動時,出現以下異常:IllegalStateException: ArrayAdapter requires the resource ID to be a Text View
。我明白這個錯誤,但由於我對Android比較陌生,所以我不確定如何解決這個問題。如何修改我的適配器以處理包含RelativeLayout
作爲根元素的頭,而不是TextView
?
編輯: 我相信答案在於適配器的構造函數方法嗎?