Develop Reference

records inserted in a sqlite table are the same for each row

I have a JSONArray which contains many records. I want to compare a string inside those object with a similar(I know it has the same value) record in my SQLite db. but when I loop the table each row value has the first row value.
INSERT A RECORD TO DB >> it returns different value
ArrayList<String> fieldsNameTasse = new ArrayList<String>();
ArrayList<String> fieldsValueTasse= new ArrayList<String>();
for (int i = 0; i < pagamenti.length(); i++) {
JSONObject row = pagamenti.getJSONObject(i); /** LOOP OGGETTI */
String fattura = row.getString("Fattura");
String descrizione = row.getString("Descrizione");
String scadenza = row.getString("Data Scadenza");
String importo = row.getString("Importo");
String stato = row.getString("Stato Pagamento");
// FATURA SHOW ALL DIFFRERENtS VALUE CORRECTLY
fieldsNameTasse.add("fattura");
fieldsValueTasse.add(fattura);
Toast.makeText(getContext(), fattura.toString(), Toast.LENGTH_LONG).show();
fieldsNameTasse.add("descrizione");
fieldsValueTasse.add(descrizione);
fieldsNameTasse.add("scadenza");
fieldsValueTasse.add(scadenza);
fieldsNameTasse.add("importo");
fieldsValueTasse.add(importo);
fieldsNameTasse.add("stato");
fieldsValueTasse.add(stato);
DBmanager.insert("TasseIncoming", fieldsNameTasse, fieldsValueTasse);
}
CHECK DB ROW VALUE << it returns always the first value
/** SHOW ALWAYS THE SAME VALUE*/
int counter = 0;
Cursor cursor = DBmanager.readAll("TasseIncoming");
while(cursor.moveToNext()) {
String ffattura = cursor.getString(cursor.getColumnIndex("fattura"));
counter++;
Toast.makeText(getContext(), ffattura+" - "+counter, Toast.LENGTH_LONG).show();
}

ArrayList<String> fieldsNameTasse = new ArrayList<String>();
ArrayList<String> fieldsValueTasse= new ArrayList<String>();
for (int i = 0; i < pagamenti.length(); i++) {
// add stuff to the above arraylists
DBmanager.insert("TasseIncoming", fieldsNameTasse, fieldsValueTasse);
}
Every time you loop, you're just adding values to the end of what's already in those ArrayLists. So there's lots of duplicate column names with different values for each. Some quick testing:
sqlite> create table foo(a, b);
sqlite> insert into foo(a,b,a,b) values(1,2,3,4);
sqlite> select * from foo;
a b
---------- ----------
1 2
indicates that when a column is included multiple times in an INSERT, only the first corresponding value is used. Hence only ever getting the values from the first iteration of the loop.
The easy fix is to move those variable definitions inside the loop, so each insert is done with a fresh set of columns and values:
for (int i = 0; i < pagamenti.length(); i++) {
ArrayList<String> fieldsNameTasse = new ArrayList<String>();
ArrayList<String> fieldsValueTasse= new ArrayList<String>();
// add stuff to the above arraylists
DBmanager.insert("TasseIncoming", fieldsNameTasse, fieldsValueTasse);
}

Get jsonArray objects without value name and pass it to list

I am trying to read json array without object name, and pass it to a list.
My json looks like :
"facilites": [
"Pool",
" Air Conditioning",
" Pets Allowed",
" Fitness center",
" Kitchen",
" Internet",
" Sona"
]
I am trying to retrieve it using the following code -
for (int l = 0; l < chaletFacilities.length(); l++){
String facilities = chaletFacilities.getString(l);
list = new ArrayList<String>();
list.add(facilities);
}
Inside the main loop I put to my pojo class chalets.setList(list);
The issue is in this line list.add(facilities); it only add the last element. After looping through all, list carry sona only.

Your list should be instantiated outside the loop.
list = new ArrayList<String>();
for (int l = 0; l < chaletFacilities.length(); l++){
String facilities = chaletFacilities.getString(l);
list.add(facilities);
}
An improvement would be directly add string to list instead of capturing it into a string variable like list.add(chaletFacilities.getString(l))

Move initialization of your ArrayList outside of your loop.
Do like this
list = new ArrayList<String>();
for (int l = 0; l < chaletFacilities.length(); l++){
list.add(chaletFacilities.getString(l))
}
What you doing is initializing yourlist again and again and adding the element. So while last iteration the list is getting initialized again and only single element is being added to it.

ArrayList list = new ArrayList<String>();
for (int l = 0; l < chaletFacilities.length(); l++){
String facilities = chaletFacilities.getString(l);
list.add(facilities);
}

You are creating the new list always. So your list size will be 1 with the last value in chaletFacilities array.
Solution: Keep your list initialization outside the for loop as below, and add all the values under the array into single list you created in the top.
list = new ArrayList<String>();
for (int l = 0; l < chaletFacilities.length(); l++)
{
list.add(chaletFacilities.getString(l));
}

How to get 50 big numbers (ascending order) in Realm database?

I'm using Realm database for my android project. I'm having a field called invoice number (Integer). The invoice number is stored in sequential order. But in this series, some numbers may not be there. For example[1,5,11,20,55,.......].
Now I want to retrieve first 50 big numbers in ascending order in Realm database.

RealmResults<MyObject> results = realm.where(MyObject.class).findAllSorted("invoiceNumber");
List<Integer> list = new LinkedList<>();
int first = Math.max(results.size()-50, 0);
for(int i = first; i < first + 50 && i < results.size(); i++) {
list.add(results.get(i).getInvoiceNumber());
}
return new ArrayList<>(list);

How to display database RANDOM in android listview

anyone know hot to display random data from database in mysql and display in listview?
i can display all data without random, but i want to displayed it random, anyone can help?
my code :
for (int i = 0; i < response.length() ; i++) {
try {
JSONObject obj = response.getJSONObject(i);
Exercise exercise = new Exercise();
if (obj.getString("KindOf").equals(textKind.getText().toString()) && obj.getString("Type").equals("Strength")) {
exercise.setTipe(obj.getString("Type"));
exercise.setJenis(obj.getString("KindOf"));
exercise.setNama(obj.getString("Name"));
exerciseList.add(exercise);
} catch (JSONException e) {
e.printStackTrace();
}
}

If you want to shuffle an ArrayList, you can just use the Collections shuffle method.
Collections.shuffle(exerciseList);
Or
SELECT *
FROM excercises
ORDER BY RAND();
If you want it at DB level.

Create a random number with
Random rand = new Random();
int n = rand.nextInt(exerciseList.size());
Then use the random number as an index to get an item from your exerciseList and add it to a new array if it doesnt exist there yet.

To random ArrayList, you can just use the Collections shuffle method.
Collections.shuffle(exerciseList);
Or you can use random function in web service method when you access data from database.

How to post multiple rows (or a LIST object) to PHP using JSON (Android)

I am creating an android application in which I am using SQLite. I have one table in which I have 5 fields. There are many rows in that table and I want to send all those rows using JSON to my PHP code so I can receive the object and insert it in the MySQL database.
What is the best way to do it. I am using LIST object but don't know how I can use POST it using JSON.
Please guide!
i am using this code
mCursor =db.rawQuery("SELECT * FROM customer", null);
while (mCursor.moveToNext()) {
// In one loop, cursor read one undergraduate all details
// Assume, we also need to see all the details of each and every undergraduate
// What we have to do is in each loop, read all the values, pass them to the POJO class
//and create a ArrayList of undergraduates
customer = new Customer();
customer.CustomerName = mCursor.getString(0).toString();
customer.Phone = mCursor.getString(1).toString();
customer.BrandName = mCursor.getString(2).toString();
customer.City = mCursor.getString(3).toString();
customer.FamilyMembers = mCursor.getString(4).toString();
customerList.add(customer);
}
for (int i = 0; i < customerList.size(); i++)
{
JSONObject row = new JSONObject();
row.put("Customer", customerList.get(i));
json.put(row);
}
Don't know how to post it to PHP code.

You have to iterate through your List and fill an JSONArray with JSONObjects for each row. In the JSONObject you can have the key as your column-name and the value with the type you need.
JSONArray json = new JSONArray();
for (int i = 0; i < list.size(); i++) {
JSONObject row = new JSONObject();
row.put("key1", list.get(i).value1);
...
json.put(row);
}
(not tested). Then you can post the json.toString() to the server and retrieve it in PHP with
$jsonstring = file_get_contents('php://input', true);