Android-SQLite删除和更新数据工作不正常

我用几个表创建了数据库，得到了一个名为friend的表。一个朋友的开销很少，有些开销可能会和另一个朋友分担。现在我正在尝试删除一个朋友，我正在尝试的是当该朋友与另一个朋友共享费用时，与另一个朋友共享的朋友的费用将添加到另一个朋友，并且该费用不会被删除。然后，不与其他朋友共享的费用将被直接删除，并且不会添加到任何朋友，因为该朋友有很多费用。现在的问题是，当我试图把费用加到另一个朋友身上时，它不起作用。我没有得到任何错误

这是我的代码：我认为问题发生在if（sharerList.size（）>1）中，因为代码的其余部分运行良好

  public void deleteFriend(String id) {
    Log.d(LOGCAT, "delete");
    SQLiteDatabase database = this.getWritableDatabase();
    ArrayList<HashMap<String, String>> wordList = new ArrayList<HashMap<String, String>>();
    String selectQuery = "SELECT * FROM FriendsExpenses WHERE friendId='" + id + "'";
    SQLiteDatabase databaseread = this.getReadableDatabase();
    Cursor cursor = databaseread.rawQuery(selectQuery, null);
    if (cursor.moveToFirst()) {
        do {
            HashMap<String, String> map = new HashMap<String, String>();
            map.put("expenseId", cursor.getString(0));
            wordList.add(map);
        } while (cursor.moveToNext());
    }
    for (int a=0; a<wordList.size();a++){
        HashMap<String, String> ValexpenseId = wordList.get(a);
        for (Entry<String, String> entry : ValexpenseId.entrySet()) {
            String value = entry.getValue();
            String selectQuery2 = "SELECT * FROM FriendsExpenses WHERE expenseId='" + value + "'";
            SQLiteDatabase databaseread2 = this.getReadableDatabase();
            Cursor cursor2 = databaseread2.rawQuery(selectQuery2, null);
            ArrayList<HashMap<String, String>> sharerList = new ArrayList<HashMap<String, String>>();
            if (cursor2.moveToFirst()) {
                do {
                    HashMap<String, String> map = new HashMap<String, String>();
                    map.put("friendId", cursor2.getString(0));
                    wordList.add(map);
                } while (cursor2.moveToNext());
            }
            else{};
            if (sharerList.size() > 1){
                String selectQuery3 = "SELECT expenseTotal FROM expenses WHERE expenseId='" + value + "'";
                SQLiteDatabase databaseread3 = this.getReadableDatabase();
                Cursor cursor3 = databaseread3.rawQuery(selectQuery3, null);
                String expenseTotal = null;
                if (cursor3.moveToFirst()) {
                    do {
                        expenseTotal = cursor3.getString(cursor3.getColumnIndex("expenseTotal"));
                    } while (cursor3.moveToNext());
                }
                for (int b=0; b<sharerList.size();b++){
                    HashMap<String, String> ValfriendId = sharerList.get(b);
                    for (Entry<String, String> entry2 : ValfriendId.entrySet()) {
                        String value2 = entry2.getValue();
                        String currentSpend = currentSpending(value2);
                        double currentSpending = (Double.parseDouble(currentSpend));
                        double expTotal = (Double.parseDouble(expenseTotal));
                        double newSpending = currentSpending + ((expTotal/sharerList.size()) /sharerList.size()-1);
                        updateSpending(value2, newSpending);
                    }
                }
            }
            else
            {
                String deleteQuery = "DELETE FROM expenses where expenseId='" + value + "'";
                Log.d("query", deleteQuery);
                database.execSQL(deleteQuery);
            }               
        }
    }
    String deleteQuery = "DELETE FROM friends where friendId='" + id + "'";
    String deleteQuery2 = "DELETE FROM FriendsExpenses where friendId='" + id + "'";
    Log.d("query", deleteQuery2);
    Log.d("query", deleteQuery);
    database.execSQL(deleteQuery2);
    database.execSQL(deleteQuery);
}

public void deleteFriend（字符串id）{
Log.d（LOGCAT，“删除”）；
SQLiteDatabase=this.getWritableDatabase（）；
ArrayList wordList=新建ArrayList（）；
String selectQuery=“SELECT*FROM friendspenses，其中friendsid=”+id+“”；
SQLiteDatabase databaseread=this.getReadableDatabase（）；
Cursor Cursor=databaseread.rawQuery（selectQuery，null）；
if（cursor.moveToFirst（））{
做{
HashMap=newHashMap（）；
map.put（“expenseId”，cursor.getString（0））；
添加（地图）；
}while（cursor.moveToNext（））；
}
对于（int a=0；a 1）{
String selectQuery3=“从expenseId='“+value+'”的费用中选择expenseTotal；
SQLiteDatabase databaseread3=this.getReadableDatabase（）；
游标cursor3=databaseread3.rawQuery（selectQuery3，null）；
字符串expenseTotal=null；
if（cursor3.moveToFirst（））{
做{
expenseTotal=cursor3.getString（cursor3.getColumnIndex（“expenseTotal”）；
}while（cursor3.moveToNext（））；
}
for（int b=0；b
sharerList
为空，因为您从未添加任何条目

可能还有其他复制/粘贴错误，例如
getString（0）
with
SELECT*