ListView z niestandardowym adapterem, dodając elementy jeden po drugim

Question

Czytanie this pytanie, próbowałem przykład podany w odpowiedzi i działa poprawnie. Teraz chcę zrobić to samo, ale z niestandardowym adapterem przy użyciu klasy Student. Tak mam:

public class AsyncDemo extends ListActivity { 
    private static final String[] items={"lorem", "ipsum", "dolor", 
             "sit", "amet", "consectetuer", 
             "adipiscing", "elit", "morbi", 
             "vel", "ligula", "vitae", 
             "arcu", "aliquet", "mollis", 
             "etiam", "vel", "erat", 
             "placerat", "ante", 
             "porttitor", "sodales", 
             "pellentesque", "augue", 
             "purus"}; 
    private List<Student> students; 
    private StudentAdapter studentsAdapter; 

    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

// setListAdapter(new ArrayAdapter<String>(this, 
//      android.R.layout.simple_list_item_1, 
//      new ArrayList<String>())); 

    students = new ArrayList<Student>(); 
    students.clear(); 
    studentsAdapter = new StudentAdapter(this, students); 
    setListAdapter(studentsAdapter); 

    new AddStringTask().execute(); 
    } 

// class AddStringTask extends AsyncTask<Void, String, Void> 
    class AddStringTask extends AsyncTask<Void, Student, Void> 
    { 
    @Override 
    protected Void doInBackground(Void... unused) 
    { 
     for (String item : items) 
     { 
     Student student = new Student(); 
     student.setName(item); 
     publishProgress(student); 

//  publishProgress(item); 

     SystemClock.sleep(200); 
    } 

    return(null); 
} 

// @SuppressWarnings("unchecked") 
// @Override 
// protected void onProgressUpdate(String... item) { 
//  ((ArrayAdapter<String>)getListAdapter()).add(item[0]); 
// } 
    @Override 
    protected void onProgressUpdate(Student... student) 
    { 
     ((StudentAdapter)getListAdapter()).add(student[0]); 
    } 

    @Override 
    protected void onPostExecute(Void unused) { 
     Toast 
     .makeText(AsyncDemo.this, "Done!", Toast.LENGTH_SHORT) 
     .show(); 
    } 
    } 
} 


package com.commonsware.android.async; 

public class Student 
{ 
private String name; 

public void setName(String name) 
    { 
    this.name = name; 
    } 
public String getName() 
    { 
    return name; 
    } 
} 

oraz:

public class StudentAdapter extends BaseAdapter { 
    private LayoutInflater inflater; 
    private List<Student> students; 
    private ViewHolder holder; 

    public StudentAdapter(Activity context,List<Student> students) 
    { 
     this.inflater = LayoutInflater.from(context); 
     this.students = students; 
    } 

public void add(Student album) 
{ 
    Log.w("StudentAdapter","add"); 
    students.add(album); 
} 

@Override 
public int getCount() 
{ 
    Log.w("StudentAdapter","getCount : " + students.size()); 
    return students.size(); 
} 

@Override 
public Object getItem(int position) 
{ 
    Log.w("StudentAdapter","getItem"); 
    return students.get(position); 
} 

@Override 
public long getItemId(int position) 
{ 
    Log.w("StudentAdapter","getItemId"); 
    return position; 
} 

private class ViewHolder 
{ 
    TextView tv_album_name; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) 
{ 
    Log.w("StudentAdapter","getView"); 
    View rowView = convertView; 

    if(rowView == null) 
    { 
     rowView = inflater.inflate(R.layout.student_item,null); 
     holder = new ViewHolder(); 
     holder.tv_album_name = (TextView) rowView.findViewById(R.id.tv_student_name); 
     rowView.setTag(holder); 
    } 
    else 
    { 
     holder = (ViewHolder) rowView.getTag(); 
    } 

    holder.tv_album_name.setText(students.get(position).getName()); 

    return rowView; 
} 

} 

Problem polega na tym, że wyświetlany jest tylko pierwszy wiersz i Toast po kilku sekundach. Nie rozumiem, dlaczego (w dzienniku) jest tylko jedno połączenie z getView! Czy wystąpił błąd w moim kodzie? Czegoś brakuje? Czy ktoś może mi pomóc?

Answer 1

spróbuj dodać tę drugą linię:

((StudentAdapter)getListAdapter()).add(student[0]); 
((StudentAdapter)getListAdapter()).notifyDataSetChanged(); 

ma pokazać, że inne elementy?

Answer 2

nazwać także notifyDataSetChanged() w swojej metodzie add() z Adapter:

public void add(Student album) 
{ 
    Log.w("StudentAdapter","add"); 
    students.add(album); 
    notifyDataSetChanged(); 
}