In my custom ListAdapter, the first time that GetView() is called, convertView is passed in as NULL, but the second time it is passed in as the view that was created the first time. My ListView has 4 rows, and all 4 are on the screen at the same time. From the documentation, it seems that convertView should be a view that was already created and has now been scrolled off the screen. I expected convertView to be null all 4 times, so that it would create / inflate 4 separate views. Am I supposed to have a convertView after the first call to getView? Thanks.
In OnCreate():
Cursor questions = db.loadQuestions(b.getLong("categoryId"), inputLanguage.getLanguageId(), outputLanguage.getLanguageId());
startManagingCursor(questions);
ListAdapter adapter = new QuestionsListAdapter(this, questions);
ListView list = (ListView)findViewById(R.id.list1);
setListAdapter(adapter);
Adapter class
private class QuestionsListAdapter extends BaseAdapter implements ListAdapter{
private Cursor c;
private Context context;
public QuestionsListAdapter(Context context, Cursor c) {
this.c = c;
this.context = context;
}
public Object getItem(int position) {
c.moveToPosition(position);
return new Question(c);
}
public long getItemId(int position) {
c.moveToPosition(position);
return new Question(c).get_id();
}
@Override
public int getItemViewType(int position) {
Question currentQuestion = (Question)this.getItem(position);
if (currentQuestion.getType().equalsIgnoreCase("text"))
return 0;
else if (currentQuestion.getType().equalsIgnoreCase("range"))
return 0;
else if (currentQuestion.getType().equalsIgnoreCase("yesNo"))
return 2;
else if (currentQuestion.getType().equalsIgnoreCase("picker"))
return 0;
else if (currentQuestion.getType().equalsIgnoreCase("command"))
return 0;
else if (currentQuestion.getType().equalsIgnoreCase("datePicker"))
return 0;
else if (currentQuestion.getType().equalsIgnoreCase("diagram"))
return 0;
else
return -1;
}
@Override
public int getViewTypeCount() {
return 7;
}
public int getCount() {
return c.getCount();
}
public View getView(int position, View convertView, ViewGroup viewGroup) {
Question currentQuestion = (Question)this.getItem(position);
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.question_row_text, null);
}
//setup cell
return convertView;
}
}
