我用几张表创建了数据库，得到了一张名为朋友的表。一个朋友的开支很少，有些开支可能会与另一个朋友分摊。现在我正在尝试删除一个朋友，我想做的是当朋友与另一个朋友分享费用时，与另一个朋友分享的朋友的费用将添加到另一个朋友，并且费用不会被删除。然后，由于朋友的费用很多，直接删除了没有与其他朋友分享的费用，并且不会添加到任何朋友。现在的问题是，当我尝试将费用添加给另一个朋友时，它不起作用。而且我没有收到任何错误。
这是我的代码：我认为问题发生在 if(sharerList.size()>1)....，因为其余代码运行良好。
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);
}