如何獲取表SQLite中的所有行？

Question

嘿，我一直在努力爲我的大學的Android項目工作，但我堅持在這一點上。我想從表students中提取所有行，將它們填充到ArrayList中，然後使用ListView或CardView來顯示每個學生的記錄。這是我正在使用的代碼：

public ArrayList<String> getStudentsEntry() 
    { 

     ArrayList<String> arrayList = new ArrayList<>(); 

     Cursor cursor = db.query("STUDENT", ALL_COLUMN_NAME, null, null, null, null, null); 
     if(cursor.getCount()<1) // UserName Not Exist 
     { 
      cursor.close(); 
      return null; 
     } 
     cursor.moveToFirst(); 
     while(cursor.isAfterLast()) { 
      String name = cursor.getString(cursor.getColumnIndex("NAME")); 
      String enrollment = cursor.getString(cursor.getColumnIndex("ENROLLMENT")); 
      String year = cursor.getString(cursor.getColumnIndex("YEAR")); 
      String dob = cursor.getString(cursor.getColumnIndex("DOB")); 
      String email = cursor.getString(cursor.getColumnIndex("EMAIL")); 
      String caste = cursor.getString(cursor.getColumnIndex("CASTE")); 
      String fname = cursor.getString(cursor.getColumnIndex("FNAME")); 
      String mname = cursor.getString(cursor.getColumnIndex("MNAME")); 
      String address = cursor.getString(cursor.getColumnIndex("ADDRESS")); 
      String contact = cursor.getString(cursor.getColumnIndex("CONTACT")); 

      arrayList.add(name); 
      arrayList.add(enrollment); 
      arrayList.add(year); 
      arrayList.add(dob); 
      arrayList.add(email); 
      arrayList.add(caste); 
      arrayList.add(fname); 
      arrayList.add(mname); 
      arrayList.add(address); 
      arrayList.add(contact); 

     } 
     return arrayList; 
    } 

它沒有返回任何東西。我無法從數據庫中獲取數據。數組大小爲零：

Caused by: java.lang.IndexOutOfBoundsException: Invalid index 1, size is 0 

在java.util.ArrayList.throwIndexOutOfBoundsException（ArrayList.java:25

請幫我傢伙，我是新來的這個東東

Answer 1

它不是while(cursor.isAfterLast())應該while(!cursor.isAfterLast())或者根本

while (cursor.moveToNext()) { 
    ... 
} 

Answer 2

ArrayList<String> arrayList = new ArrayList<>(); 

Cursor cursor = database.query("STUDENT", ALL_COLUMN_NAME, null, null, null, null, null); 
if(cursor.getCount()<1) // UserName Not Exist 
{ 
    cursor.close(); 
    return null; 
} 
cursor.moveToFirst(); 
while(!cursor.isAfterLast()) { 
    for (int column = 0; column < cursor.getColumnCount(); column ++) { 
     arrayList.add(cursor.getString(column));  
    } 
} 
return arrayList; 

。