ListView未填充

Question

在我的DATABASEADAPTER CLASS中，我编写了以下代码：

public Cursor getdetails(){
          Cursor mCursor = db.query(CONTACTS_TABLE_NAME, new String[] {CONTACTS_COLUMN_ID,
                  CONTACTS_COLUMN_NAME, CONTACTS_COLUMN_PASSWROD, CONTACTS_COLUMN_EMAIL, CONTACTS_COLUMN_PHONE,CONTACTS_COLUMN_ADDRESS}, 
            null, null, null, null, null);
         return mCursor; 
     }

在我的List活动中，我完成了以下操作：

public class List extends Activity {
     private LoginDataBaseAdapter database;
     Cursor cursor;
     public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            database = new LoginDataBaseAdapter(this);
            database.open();
           cursor = database.getdetails();
           ListView lst = (ListView)findViewById(R.id.list);
           @SuppressWarnings("deprecation")
        ListAdapter adapter=new SimpleCursorAdapter(
             this,
             android.R.layout.simple_list_item_1,
             cursor,
             new String[] {cursor.getColumnName(cursor.getColumnIndex("CONTACTS_COLUMN_NAME"))},
             new int[] {android.R.id.text1});
          lst.setAdapter(adapter);
    database.close();
     }
        }