I have a ListView
with custom Adapter
. I have to add at position 2,6,9 separators. How to do that?
Here is my code
class MyIndexerAdapter<T> extends ArrayAdapter<T> implements SectionIndexer {
ArrayList<String> myElements;
HashMap<String, Integer> alphaIndexer;
private static final int TYPE_ITEM = 0;
private static final int TYPE_SEPARATOR = 1;
private static final int TYPE_MAX_COUNT = TYPE_SEPARATOR + 1;
TreeSet mSeparatorsSet = new TreeSet();
String[] sections;
LayoutInflater mInflater;
public MyIndexerAdapter(Context context, int textViewResourceId,
List<T> objects) {
super(context, textViewResourceId, objects);
mInflater=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
myElements = (ArrayList<String>) objects;
// here is the tricky stuff
alphaIndexer = new HashMap<String, Integer>();
// in this hashmap we will store here the positions for
// the sections
int size = elements.size();
for (int i = size - 1; i >= 0; i--) {
String element = elements.get(i);
alphaIndexer.put(element.substring(0, 1), i);
//We store the first letter of the word, and its index.
//The Hashmap will replace the value for identical keys are putted in
}
// now we have an hashmap containing for each first-letter
// sections(key), the index(value) in where this sections begins
// we have now to build the sections(letters to be displayed)
// array .it must contains the keys, and must (I do so...) be
// ordered alphabetically
Set<String> keys = alphaIndexer.keySet(); // set of letters ...sets
// cannot be sorted...
Iterator<String> it = keys.iterator();
ArrayList<String> keyList = new ArrayList<String>(); // list can be
// sorted
while (it.hasNext()) {
String key = it.next();
keyList.add(key);
}
Collections.sort(keyList);
sections = new String[keyList.size()]; // simple conversion to an
// array of object
keyList.toArray(sections);
// ooOO00K !
}
public int getItemViewType(int position)
{
return mSeparatorsSet.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
}
public int getViewTypeCount()
{
return TYPE_MAX_COUNT;
}
public int getPositionForSection(int section) {
// Log.v("getPositionForSection", ""+section);
String letter = sections[section];
return alphaIndexer.get(letter);
}
public int getSectionForPosition(int position) {
// you will notice it will be never called (right?)
Log.v("getSectionForPosition", "called");
getSections();
return 0;
}
public Object[] getSections() {
return sections; // to string will be called each object, to display
// the letter
}
public void onListItemClick(ListView parent,View v, int position, long id)
{
Toast.makeText(getContext(), "you have selected" + elements.get(position), Toast.LENGTH_SHORT).show();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
int type = getItemViewType(position);
System.out.println("getView " + position + " " + convertView + " type = " + type);
if (convertView == null) {
holder = new ViewHolder();
switch (type) {
case TYPE_ITEM:
convertView = mInflater.inflate(R.layout.main, null);
holder.textView = (TextView)convertView.findViewById(R.id.text);
//break;
case TYPE_SEPARATOR:
convertView = mInflater.inflate(R.layout.item1, null);
holder.textView = (TextView)convertView.findViewById(R.id.textSeparator);
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder)convertView.getTag();
}
holder.textView.setText(elements.get(position));
return convertView;
}
}
}
In your
getView()
of MyIndexerAdapter, use the position argument to check whether it is 2.6.9 and then add the separator in codeTry the below completed code, it was running for me : This code also shows how to use adapter methods like
getItemViewType()
,getViewTypeCount()
,getView()
when needed to display different types of views at different positions. It also shows how to implement aSectionIndexer
and its methods.I added some random data at position 2,6,9 where you wanted the separators. This made things easier.
the xml I used is :