I have an android app that populates a listview with a custom adapter. This adapter adds sections to the listview with headers. This adapter is shown below:
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;
}
}
Which is then called by the following code:
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);
Now until recently, my list_header xml file had a TextView root element. At this point it was working perfectly. But then I wanted to expand on the header to contain more than one view. The new root element of the list_header is now a RelativeLayout.
Now when I try and start the activity, I get the following exception: IllegalStateException: ArrayAdapter requires the resource ID to be a Text View. I understand the error but since I am relatively new to Android, I am unsure how to get around this problem. How can I modify my adapter to handle headers which contain a RelativeLayout as the root element, instead of a TextView?
Edit: I believe the answer lies in the constructor method of the adapter?
