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how to put a few data into array variable and post as JSONarray?

I'm trying to make a laundry ordering application. I've made it to the order process, at the end of the order process, the user clicks the next button to checkout the ordered results, I have successfully made the checkout results, but what I made is still in one variable string. how to put the checkout results into an array variable so that I can post the results in the form of JSONArray?
HERE IS MY ORDER ACTIVITY CODE :
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_produk);
// menghubungkan variablel pada layout dan pada java
listProduk = (ListView)findViewById(R.id.list_produk);
swipeProduct = (SwipeRefreshLayout)findViewById(R.id.swipeProduct);
radioExpress = (RadioButton)findViewById(R.id.radio_express);
radioReguler = (RadioButton)findViewById(R.id.radio_regular);
tvTotal = (TextView)findViewById(R.id.total);
next = (Button)findViewById(R.id.button_next);
actionBar = getSupportActionBar();
laundry_id = getIntent().getStringExtra(TAG_LAUNDRY_ID);
// untuk mengisi data dari JSON ke dalam adapter
productAdapter = new CheckboxAdapter(this, (ArrayList<ProductModel>) productList, this);
listProduk.setAdapter(productAdapter);
listProduk.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
productAdapter.setCheckBox(position);
}
});
// menampilkan widget refresh
swipeProduct.setOnRefreshListener(this);
swipeProduct.post(new Runnable() {
#Override
public void run() {
swipeProduct.setRefreshing(true);
productList.clear();
tvTotal.setText(String.valueOf(0));
radioReguler.isChecked();
regular = true;
productAdapter.notifyDataSetChanged();
callProduct();
}
}
);
next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String checkbox = "";
for (ProductModel hold : productAdapter.getAllData()) {
int total = Integer.parseInt(hold.getProduct_price())*(hold.getCountProduct());
if (hold.isCheckbox()) {
checkbox += "\n" + hold.getProduct_name() + " " + total;
}
}
if (!checkbox.isEmpty()) {
dipilih = checkbox;
} else {
dipilih = "Anda Belum Memilih Menu.";
}
formSubmit(dipilih);
}
});
}
private void formSubmit(String hasil){
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
LayoutInflater inflater = getLayoutInflater();
View dialogView = inflater.inflate(R.layout.form_submit, null);
dialog.setView(dialogView);
dialog.setIcon(R.mipmap.ic_launcher);
dialog.setTitle("Menu Yang Dipilih");
dialog.setCancelable(true);
txtnamaProduk = (TextView) dialogView.findViewById(R.id.txtNama_produk);
txtnamaProduk.setText(hasil);
dialog.setNeutralButton("CLOSE", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialog.show();
}
AND HERE IS THE CODE OF THE RESULT :
next.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String checkbox = "";
for (ProductModel hold : productAdapter.getAllData()) {
int total = Integer.parseInt(hold.getProduct_price())*(hold.getCountProduct());
if (hold.isCheckbox()) {
checkbox += "\n" + hold.getProduct_name() + " " + total;
}
}
if (!checkbox.isEmpty()) {
dipilih = checkbox;
} else {
dipilih = "Anda Belum Memilih Menu.";
}
formSubmit(dipilih);
}
});
}
in my code above, I still use the variable checkbox to accommodate all the results of the order chosen by the user. how to put all the result into array variable so i can post to server as a JSONArray? Please help me to solve this problem. because i'm still a beginner in android.
HERE IS MY ADAPTER CODE IF NEEDED :
public class CheckboxAdapter extends BaseAdapter{
private Context context;
private ArrayList<ProductModel> productItems;
ProdukLaundry produk;
public CheckboxAdapter(Context context, ArrayList<ProductModel> items, ProdukLaundry produk) {
this.context = context;
this.productItems = items;
this.produk = produk;
}
#Override
public int getItemViewType(int position) {
return position;
}
#Override
public int getCount() {
return productItems.size();
}
#Override
public Object getItem(int position) {
return productItems.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(final int position, View view, ViewGroup parent) {
final ViewHolder viewHolder;
final ProductModel items = productItems.get(position);
if(view == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_produk, null, true);
viewHolder.checkBox = (CheckBox) view.findViewById(R.id.checkBox_productName);
viewHolder.decrease = (TextView) view.findViewById(R.id.decrease_product);
viewHolder.count = (TextView) view.findViewById(R.id.count_product);
viewHolder.increase = (TextView) view.findViewById(R.id.increase_product);
viewHolder.price = (TextView) view.findViewById(R.id.product_price);
view.setTag(viewHolder);
}else{
viewHolder = (ViewHolder) view.getTag();
}
viewHolder.checkBox.setText(items.getProduct_name());
viewHolder.price.setText(items.getProduct_price());
viewHolder.count.setText(String.valueOf(items.getCountProduct()));
//fungsi untuk set posisi textview + dan -
viewHolder.increase.setTag(R.integer.btn_plus_view, view);
viewHolder.increase.setTag(R.integer.btn_plus_pos, position);
viewHolder.decrease.setTag(R.integer.btn_minus_view, view);
viewHolder.decrease.setTag(R.integer.btn_minus_pos, position);
//fungsi untuk disable textview + dan - jika checkbox tidak di klik
viewHolder.decrease.setOnClickListener(null);
viewHolder.increase.setOnClickListener(null);
if(items.isCheckbox()){
viewHolder.checkBox.setChecked(true);
viewHolder.increase.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View tempview = (View) viewHolder.increase.getTag(R.integer.btn_plus_view);
TextView tv = (TextView) tempview.findViewById(R.id.count_product);
Integer pos = (Integer) viewHolder.increase.getTag(R.integer.btn_plus_pos);
int countProduct = Integer.parseInt(tv.getText().toString()) + 1;
tv.setText(String.valueOf(countProduct));
productItems.get(pos).setCountProduct(countProduct);
produk.tambah(pos);
}
});
viewHolder.decrease.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View tempview = (View)viewHolder.decrease.getTag(R.integer.btn_minus_view);
TextView tv = (TextView) tempview.findViewById(R.id.count_product);
Integer pos = (Integer) viewHolder.decrease.getTag(R.integer.btn_minus_pos);
int total = productItems.get(pos).getCountProduct();
if (total>0){
int countProduct = Integer.parseInt(tv.getText().toString()) - 1;
tv.setText(String.valueOf(countProduct));
productItems.get(pos).setCountProduct(countProduct);
produk.kurang(pos);
}
}
});
} else {
viewHolder.checkBox.setChecked(false);
//fungsi untuk reset jumlah harga dan produk pada checkbox
String count = viewHolder.count.getText().toString();
int jumlah = Integer.parseInt(count);
int harga = Integer.parseInt(productItems.get(position).getProduct_price());
int kurang = jumlah * harga;
viewHolder.count.setText("0");
productItems.get(position).setCountProduct(0);
produk.kurangCheckbox(kurang);
}
return view;
}
public ArrayList<ProductModel> getAllData(){
return productItems;
}
public void setCheckBox(int position){
ProductModel items = productItems.get(position);
items.setCheckbox(!items.isCheckbox());
notifyDataSetChanged();
}
static class ViewHolder{
TextView decrease, count, increase, price;
CheckBox checkBox;
}
}

just create getter setter method of Arraylist like below
CompleteOrder:-
public class CompleteOrder {
List<OrderItem> order_items;
public List<OrderItem> getOrder_items() {
return order_items;
}
public void setOrder_items(List<OrderItem> order_items) {
this.order_items = order_items;
}
}
Create another Getter setter class of variable you want to add in arraylist
OrderItem:-
public class OrderItem {
String product_name;
int product_total;
public OrderItem(String product_name, int product_total) {
this.product_name = product_name;
this.product_total = product_total;
}
public String getProduct_name() {
return product_name;
}
public void setProduct_name(String product_name) {
this.product_name = product_name;
}
public int getProduct_total() {
return product_total;
}
public void setProduct_total(int product_total) {
this.product_total = product_total;
}
}
Now in your onClick method just create new List as below
public void onClick(View view) {
String checkbox = "";
CompleteOrder completeOrder=new CompleteOrder();
List<OrderItem> masterProductorderCount=new ArrayList<>();
for (ProductModel hold : productAdapter.getAllData()) {
int total = Integer.parseInt(hold.getProduct_price())*(hold.getCountProduct());
if (hold.isCheckbox()) {
checkbox += "\n" + hold.getProduct_name() + " " + total;
masterProductorderCount.add(new OrderItem(holder.getProduct_name(),total);
}
}
completeOrder.setOrder_items(masterProductorderCount);
if (!checkbox.isEmpty()) {
dipilih = checkbox;
} else {
dipilih = "Anda Belum Memilih Menu.";
}
formSubmit(completeOrder);//pass object of CompleteOrder
}
});
CompleteOrder object give JSON output as below
{
"CompleteOrder":[
{
"product_name":"your product name",
"product_total":1
},
{
"product_name":"your product name",
"product_total":1
},
{
"product_name":"your product name",
"product_total":1
}
]
}

make a model that contains product name , total and etc,
then put each data into an object and put each object into an array
finally use Gson to map properties to model / list of models or the other way around.
ArrayList<Model> list = new ArrayList<>();
for (ProductModel hold : productAdapter.getAllData()) {
int total = Integer.parseInt(hold.getProduct_price())*(hold.getCountProduct());
if (hold.isCheckbox()) {
Model model = new Model();
model.productName = hold.getProduct_name();
model.total = total;
list.add(model);
}
}
String jsonArray = Gson().toJson(list);

You need to create a JSONObject for each entry in the JSONArray.
As far as I can see this should take care of it:
public void onClick(View view) {
String checkbox = "";
JSONArray jsonArray = new JSONArray();
for (ProductModel hold : productAdapter.getAllData()) {
int total = Integer.parseInt(hold.getProduct_price())*(hold.getCountProduct());
if (hold.isCheckbox()) {
checkbox += "\n" + hold.getProduct_name() + " " + total;
JSONObject jsonObj = new JSONObject();
jsonObj.put("product_name", hold.getProduct_name());
jsonObj.put("product_total", total);
jsonArray.put(jsonObj);
}
}
if (!checkbox.isEmpty()) {
dipilih = checkbox;
} else {
dipilih = "Anda Belum Memilih Menu.";
}
String jsonArrayString = jsonArray.toString();
formSubmit(dipilih);
}
Depending on your data the resulting string from jsonArrayString would be:
{[
{"product_name":"product1","product_total":1},
{"product_name":"product2","product_total":2},
{"product_name":"product3","product_total":3}
]}
I really do not know what you intend on doing with the JSON data so I just created a String "jsonArrayString".. do what ever you need to with it.

Icons in Listview with custom adapter dont change when an option is selected

I made a custom adapter that displays objects in Listview and an icon for each item in list. There are 3 icons that show next to an item in the list view. User can select option "Kupljeno" which changes Status of object to 1, option "Nije kupljeno" to 0 and "Nije dostupno" to 2. Each number represents a different icon, you can that in getView() function of Adapter class. The adapter class looks like this:
public class ListaAdapter extends ArrayAdapter<Proizvod> {
public ListaAdapter(Context context, ArrayList<Proizvod> proizvodi) {
super(context, 0, proizvodi);
}
public void remove(int position) {
this.remove(getItem(position));
}
public View getView(int position, View convertView, ViewGroup parent) {
Proizvod proizvod = getItem(position);
if(convertView==null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.shoppinglista_prikazproizvoda,parent,false);
TextView t = (TextView)convertView.findViewById(R.id.text1);
t.setText(proizvod.toString());
switch(proizvod.getStatus())
{
case 0:
t.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.mipmap.ic_nijekupljeno, 0);
break;
case 1:
t.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.mipmap.ic_kupljeno, 0);
break;
case 2:
t.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.mipmap.ic_nedostupno, 0);
break;
}
}
return convertView;
}
}
You can see that I set icon of each item in getView().
The user should be able to change Status of each Proizvod object with a context menu and when the user chooses object Status, the list should update and show the appropriate icon.
My Proizvod class is this:
public class Proizvod {
private int id;
private String naziv;
private int kolicina=1;
private double cijena;
private String lista;
public int status=0; //0 - nije kupljeno, 1 - kupljeno, 2 - nedostupno
public Proizvod() {
}
public Proizvod(int id, String naziv, int kolicina, double cijena, String lista, int status) {
this.id = id;
this.naziv = naziv;
this.kolicina = kolicina;
this.cijena = cijena;
this.status = status;
}
public String getNaziv() {
return naziv;
}
public void setNaziv(String naziv) {
this.naziv = naziv;
}
public int getKolicina() {
return kolicina;
}
public void setKolicina(int kolicina) {
this.kolicina = kolicina;
}
public double getCijena() { return cijena; }
public void setCijena(double cijena) {
this.cijena = cijena;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getLista() { return lista; }
public void setLista(String lista) { this.lista = lista; }
public int getStatus() { return status; }
public void setStatus(int status) { this.status = status; }
#Override
public String toString() {
if(this.kolicina==1) {
return this.naziv + " ["+ this.kolicina +" komad, ukupno " + this.cijena + " kn ]";
}
else {
return this.naziv + " ["+ this.kolicina +" komada, ukupno " + this.cijena + " kn ]";
}
}
}
The code for context menu and changing icon (activity):
public class KreiranjeListeActivity extends AppCompatActivity {
ArrayList<Proizvod> ShoppingLista = new ArrayList<Proizvod>();
EditText nazivProizvoda;
EditText kolicina;
EditText cijena;
Button dodaj;
Button ocisti;
Button spremi;
ListView lista;
ListaAdapter adapter;
//Funkcija vraća ukupan iznos svih stavki u listi
public void AzurirajUkupniTrosak() {
DecimalFormat zaokruzi=new DecimalFormat("0.00");
double ukupniIznos=0;
for(Proizvod p : ShoppingLista)
{
ukupniIznos+=p.getCijena();
}
String ukupniIznosString=zaokruzi.format(ukupniIznos);
TextView prikazUkupnogIznosa=(TextView)findViewById(R.id.textView_ukupaniznos);
prikazUkupnogIznosa.setText("Ukupno: " + ukupniIznosString + " kn");
}
//Funkcija otvara meni dužim pritiskom na stavku u listi i nudi opciju brisanja stavke
#Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
if (v.getId() == R.id.shoppinglista2_list) {
ListView lv = (ListView) v;
AdapterView.AdapterContextMenuInfo acmi = (AdapterView.AdapterContextMenuInfo) menuInfo;
Proizvod proizvod = (Proizvod) lv.getItemAtPosition(acmi.position);
menu.add(200,201,1,"Obriši");
menu.add(200,202,2,"Kupljeno");
menu.add(200,203,3,"Nije kupljeno");
menu.add(200,204,4,"Proizvod je nedostupan");
menu.add(200,205,5,"Zatvori prozor");
}
}
//funkcija u kojoj se sa adaptera briše odabrana stavka, iste promjene se automatski primijene i na listu
#Override
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
switch (item.getItemId()) {
case 201:
adapter.remove(info.position);
adapter.notifyDataSetChanged();
AzurirajUkupniTrosak();
return true;
case 202:
ShoppingLista.get(info.position).setStatus(1);
adapter.notifyDataSetChanged();
return true;
case 203:
ShoppingLista.get(info.position).setStatus(0);
adapter.notifyDataSetChanged();
return true;
case 204:
ShoppingLista.get(info.position).setStatus(2);
adapter.notifyDataSetChanged();
return true;
}
return true;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_kreiranje_liste);
final DBHandler db = new DBHandler(this);
nazivProizvoda=(EditText)findViewById(R.id.nazivproizvoda_text);
kolicina=(EditText)findViewById(R.id.kolicinaproizvoda_text);
cijena=(EditText)findViewById(R.id.cijenaproizvoda_text);
dodaj=(Button)findViewById(R.id.dodaj_gumb);
ocisti=(Button)findViewById(R.id.ocisti_gumb);
spremi=(Button)findViewById(R.id.spremi_gumb);
lista=(ListView)findViewById(R.id.shoppinglista2_list);
registerForContextMenu(lista);
adapter = new ListaAdapter(this,ShoppingLista);
lista.setAdapter(adapter);
dodaj.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
/////////////PROVJERE KOD UPISA ///////////////////////
if(TextUtils.isEmpty(nazivProizvoda.getText())) {
nazivProizvoda.setError("Unesite naziv proizvoda!");
return;
}
if(TextUtils.isEmpty(cijena.getText())) {
cijena.setError("Unesite cijenu!");
return;
}
if(TextUtils.isEmpty(kolicina.getText())) {
kolicina.setError("Unesite količinu!");
return;
}
if((kolicina.getText().toString()).contains(".")) {
kolicina.setError("Unesite ispravan broj!");
return;
}
/////////////PROVJERE KOD UPISA -KRAJ ////////////////////////
DecimalFormat zaokruzi=new DecimalFormat("0.00");
Proizvod p = new Proizvod();
p.setNaziv(nazivProizvoda.getText().toString());
p.setKolicina(Integer.parseInt(kolicina.getText().toString()));
String ukupnaCijena=zaokruzi.format(Float.parseFloat(cijena.getText().toString())*Integer.parseInt(kolicina.getText().toString())).toString();
p.setCijena(Double.parseDouble(ukupnaCijena)); //množi se količina sa cijenom jednog komada proizvoda
ShoppingLista.add(p);
adapter.notifyDataSetChanged();
AzurirajUkupniTrosak();
Toast.makeText(getApplicationContext(), "Proizvod dodan u listu!",
Toast.LENGTH_SHORT).show();
nazivProizvoda.setText("");
kolicina.setText("");
cijena.setText("");
}
});
ocisti.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ShoppingLista.clear();
adapter.notifyDataSetChanged();
AzurirajUkupniTrosak();
Toast.makeText(getApplicationContext(), "Proizvodi su obrisani!",
Toast.LENGTH_SHORT).show();
}
});
spremi.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// get prompts.xml view
LayoutInflater li = LayoutInflater.from(KreiranjeListeActivity.this);
View promptsView = li.inflate(R.layout.spremanje_liste, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
KreiranjeListeActivity.this);
// set prompts.xml to alertdialog builder
alertDialogBuilder.setView(promptsView);
final EditText nazivListe = (EditText) promptsView
.findViewById(R.id.nazivListe);
// set dialog message
alertDialogBuilder
.setCancelable(false)
.setPositiveButton("Spremi",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
ShoppingLista shoppinglista = new ShoppingLista(nazivListe.getText().toString(),"TEST DATUMA");
/////POSTAVLJANJE UKUPNOG IZNOSA U NOVOSTVORENU LISTU
DecimalFormat zaokruzi=new DecimalFormat("0.00");
double ukupniIznos=0;
for(Proizvod p : ShoppingLista)
{
ukupniIznos+=p.getCijena();
}
//////////////////////////////////////////////////////
db.dodajListu(shoppinglista);
for(Proizvod p : ShoppingLista)
{
db.dodajProizvod(p,nazivListe.getText().toString());
}
Intent i = new Intent(KreiranjeListeActivity.this, PopisListaActivity.class);
startActivity(i);
}
})
.setNegativeButton("Otkaži",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
dialog.cancel();
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
});
}
}
The problem is that the icons don't change at all. The value of Status of a selected object changes but the icon doesn't, even though I use adapter.notifyDataSetChanged(); What's wrong?

Here change this in your code in your List adapter class:
First create a list of type Proizvod
List<Proizvod> dataList = new ArrayList<>();
then
public ListaAdapter(Context context, ArrayList<Proizvod> proizvodi) {
super(context, 0, proizvodi);
this.dataList = proizvodi;
}
In place of Proizvod proizvod = getItem(position);
use
Proizvod proizvod = dataList.getItem(position);
Hope it helps!!!

Android - My ListViewAdpter class in which getCount always is returning 0

I am using Listview to infate the value from backend end.My problem is that whenever i Run my code i always get the size of arraylist zero in getcount method.
I have search but have not understood properly
Can Anyone Help Me out From it Please Friend
My Listview Adapter Class is
private class ListViewAdaptar extends BaseAdapter {
private LayoutInflater _inflater;
private List<Student_Location_Model> _list;
private Context _context;
String enroll_no;
String driver_id, hash;
//CharSequence[] show_data = {"Home Pick", "Home Drop", "School Pick", "School Drop", "Absent", "Other"};
CharSequence[] show_data1 = {"School Drop", "School Pick", "Home Drop", "Absent"};
String cat = "notselected";
String changed_cat, remark = "remark";
public ListViewAdaptar(Activity context, List<Student_Location_Model> lst) {
if (context != null && lst != null) {
this._context = context;
_list = lst;
_inflater = LayoutInflater.from(context);
}
}
#Override
public int getCount() {
return _list.size();
}
#Override
public Object getItem(int i) {
return _list.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public int getViewTypeCount() {
return getCount();
}
#Override
public View getView(final int position, View listItems, ViewGroup parent) {
final ViewHolder holder;
SharedPreferences sharedPreferences = _context.getSharedPreferences(_context.getString(R.string.BUS_DETAILS), Context.MODE_PRIVATE);
hash = sharedPreferences.getString(_context.getString(R.string.HASH), "");
driver_id = sharedPreferences.getString(_context.getString(R.string.DRIVER_ID), "");
// if (listItems == null) {
listItems = _inflater.inflate(R.layout.listview_adapter_design, null);
holder = new ViewHolder();
holder.txt_loc_id = (TextView) listItems.findViewById(R.id.location_id);
holder.txt_enroll_no = (TextView) listItems.findViewById(R.id.textview_student_enroll);
holder.txt_student_name = (TextView) listItems.findViewById(R.id.textview_student_name);
holder.select_data = (TextView) listItems.findViewById(R.id.select_data);
holder.checkbox_select_one = (CheckBox) listItems.findViewById(R.id.checkbox_select_one);
final Student_Location_Model locationModel = _list.get(position);
holder.txt_student_name.setText(locationModel.getStudent_name());
holder.txt_enroll_no.setText(locationModel.getEnroll_num());
holder.txt_loc_id.setText(locationModel.getLocation_name());
holder.checkbox_select_one.setChecked(locationModel.isItemCheck());
holder.select_data.setText(locationModel.getStudent_track_status());
holder.checkbox_select_one.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (((CheckBox) view).isChecked()) {
Student_Location_Model model = _list.get(position);
model.setItemCheck(true);
notifyDataSetChanged();
} else {
Student_Location_Model model = _list.get(position);
model.setItemCheck(false);
notifyDataSetChanged();
}
String selected_student = "";
for (int i = 0; i < _list.size(); i++) {
Student_Location_Model locationModel1 = _list.get(i);
if (locationModel1.isItemCheck()) {
selected_student = locationModel1.getEnroll_num() + " , " + selected_student;
}
}
checkbox_select_all.setChecked(false);
Log.e("String of Students :- ", selected_student);
selected_enroll_no.setText(selected_student);
}
});
if (holder.checkbox_select_one.isChecked()) {
SharedPreferences preferences = New_Student_Details_Location.this.getSharedPreferences(getString(R.string.LATEST_SELECTION), MODE_PRIVATE);
String new_selection = preferences.getString(getString(R.string.SELECTED_VALUE), "");
holder.select_data.setText(new_selection);
if (new_selection.equalsIgnoreCase("")) {
holder.select_data.setText("Select");
}
}
holder.select_data.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final AlertDialog.Builder builder;
builder = new AlertDialog.Builder(_context);
builder.setTitle("Select One");
builder.setSingleChoiceItems(show_data1, -1, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
switch (i) {
case 0:
cat = (String) show_data1[i];
break;
case 1:
cat = (String) show_data1[i];
//holder.select_data.setText(cat);
break;
case 2:
cat = (String) show_data1[i];
// holder.select_data.setText(cat);
break;
case 3:
cat = (String) show_data1[i];
// holder.select_data.setText(cat);
break;
}
}
});
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
/* if (cat.equalsIgnoreCase("Home Pick")) {
holder.select_data.setText(cat);
//newcat = holder.select_data.getText().toString();
changed_cat = cat.replace("Home Pick", "home_pickup");
enroll_no = holder.txt_enroll_no.getText().toString();
Toast.makeText(_context, "You have Selected " + cat, Toast.LENGTH_SHORT).show();
new BackgroundJob().execute();
cat = "notselected";
}*/
if (cat.equalsIgnoreCase("Home Drop")) {
holder.select_data.setText(cat);
//newcat = holder.select_data.getText().toString();
changed_cat = cat.replace("Home Drop", "home_drop");
enroll_no = holder.txt_enroll_no.getText().toString();
StyleableToast.makeText(_context, "You Selected " + cat, Toast.LENGTH_SHORT, R.style.StyledToast).show();
new BackgroundJob().execute();
cat = "notselected";
} else if (cat.equalsIgnoreCase("School Pick")) {
holder.select_data.setText(cat);
//newcat = holder.select_data.getText().toString();
changed_cat = cat.replace("School Pick", "school_pickup");
enroll_no = holder.txt_enroll_no.getText().toString();
StyleableToast.makeText(_context, "You Selected " + cat, Toast.LENGTH_SHORT, R.style.StyledToast).show();
new BackgroundJob().execute();
cat = "notselected";
} else if (cat.equalsIgnoreCase("School Drop")) {
holder.select_data.setText(cat);
//newcat = holder.select_data.getText().toString();
changed_cat = cat.replace("School Drop", "school_drop");
enroll_no = holder.txt_enroll_no.getText().toString();
StyleableToast.makeText(_context, "You Selected " + cat, Toast.LENGTH_SHORT, R.style.StyledToast).show();
new BackgroundJob().execute();
cat = "notselected";
} else if (cat.equalsIgnoreCase("Absent")) {
holder.select_data.setText(cat);
//newcat = holder.select_data.getText().toString();
changed_cat = cat.replace("Absent", "absent");
enroll_no = holder.txt_enroll_no.getText().toString();
StyleableToast.makeText(_context, "You Selected " + cat, Toast.LENGTH_SHORT, R.style.StyledToast).show();
new BackgroundJob().execute();
cat = "notselected";
}
/* else if (cat.equalsIgnoreCase("Other")) {
holder.select_data.setText(cat);
//newcat = holder.select_data.getText().toString();
changed_cat = cat.replace("Other", "other");
enroll_no = holder.txt_enroll_no.getText().toString();
AlertDialog.Builder builder1 = new AlertDialog.Builder(_context);
final EditText edt_remark = new EditText(_context);
builder1.setTitle("Reason");
builder1.setMessage("Please enter a valid reason");
builder1.setView(edt_remark);
builder1.setPositiveButton("SAVE", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
remark = edt_remark.getText().toString();
new BackgroundJob().execute();
}
});
builder1.show();
cat = "notselected";
}*/
else if (cat.equalsIgnoreCase("notselected")) {
StyleableToast.makeText(_context, "Please Select One", Toast.LENGTH_SHORT, R.style.StyledToast_one).show();
}
}
});
builder.setCancelable(false);
builder.show();
}
});
listItems.setTag(holder);
listItems.setTag(R.id.checkbox_select_one, holder.checkbox_select_one);
holder.checkbox_select_one.setTag(position);
return listItems;
}
#Override
public int getItemViewType(int position) {
return position;
}
private class ViewHolder {
TextView txt_loc_id;
TextView txt_enroll_no;
TextView txt_student_name;
TextView select_data;
CheckBox checkbox_select_one;
}
private class BackgroundJob extends AsyncTask<String, String, String> {
#Override
protected String doInBackground(String... strings) {
return JsonParser.makeHttpUrlConnectionRequest(API.Update_Student_Details, dataparams());
}
private List<NameValuePair> dataparams() {
ArrayList<NameValuePair> parameters = new ArrayList<>();
parameters.add(new BasicNameValuePair("hash", hash));
parameters.add(new BasicNameValuePair("driver_id", driver_id));
parameters.add(new BasicNameValuePair("enroll_num", enroll_no));
parameters.add(new BasicNameValuePair("track_status", changed_cat));
parameters.add(new BasicNameValuePair("remark", remark));
Log.e("Parematers", ":" + parameters);
return parameters;
}
#Override
protected void onPostExecute(String httpResponse) {
JSONObject responseParameters;
if (httpResponse == null) {
StyleableToast.makeText(_context, "No Internet Connection", Toast.LENGTH_SHORT, R.style.StyledToast_one).show();
} else {
try {
responseParameters = new JSONObject(httpResponse);
String status = responseParameters.getString("status");
if (status.equalsIgnoreCase("success")) {
StyleableToast.makeText(_context, "Saved Successfully.", Toast.LENGTH_SHORT, R.style.StyledToast).show();
} else {
StyleableToast.makeText(_context, "Status Already Updated", Toast.LENGTH_SHORT, R.style.StyledToast_one).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
}
My Class for setting the adapter
public class Student_Location_Model {
String location_id, location_name, enroll_num, student_name, student_track_status;
boolean isItemCheck;
public Student_Location_Model(String location_id, String location_name,
String enroll_num, String student_name,
boolean isItemCheck, String student_track_status) {
this.location_id = location_id;
this.location_name = location_name;
this.enroll_num = enroll_num;
this.student_name = student_name;
this.isItemCheck = isItemCheck;
this.student_track_status = student_track_status;
}
public String getStudent_track_status() {
return student_track_status;
}
public void setStudent_track_status(String student_track_status) {
this.student_track_status = student_track_status;
}
public boolean isItemCheck() {
return isItemCheck;
}
public void setItemCheck(boolean itemCheck) {
isItemCheck = itemCheck;
}
public String getLocation_id() {
return location_id;
}
public void setLocation_id(String location_id) {
this.location_id = location_id;
}
public String getLocation_name() {
return location_name;
}
public void setLocation_name(String location_name) {
this.location_name = location_name;
}
public String getEnroll_num() {
return enroll_num;
}
public void setEnroll_num(String enroll_num) {
this.enroll_num = enroll_num;
}
public String getStudent_name() {
return student_name;
}
public void setStudent_name(String student_name) {
this.student_name = student_name;
}
}

Writing data from a ListView to a Text File on Android

I'm new to Java and Android and am trying to figure out how to write a ListView and load the ListView from where it is saved.
I have ListView and each item on the ListView has a string and bool that changes if a checkbox for the item is checked or unchecked. I have a working method to add items to the ListView and am now trying to figure out how to write the ListView to a textfile.
I got some code for saving the ListView by clicking a menu item and them I'm trying to load it when I re-run the program in my OnCreate, but nothing is loading. I'm not sure if its the write or load that is not working or both.
Here is a class I made that works with my ListView.
Item.java
public class Item {
String name;
boolean isChecked = false;
public Item(String name) {this.name = name;}
public Item(String name, boolean checked){
this.name = name;
this.isChecked = checked;
}
#Override
public String toString(){
return name;
}
}
Here is my MainActivity.java that includes my saveList() and readFile()
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getName();
ArrayList<Item> items = new ArrayList<>();
private ListView lv;
private static final String sFile = "Saved.txt";
protected ListView getListView() {
if (lv == null) {
lv = (ListView) findViewById(android.R.id.list);
}
return lv;
}
protected void setListAdapter(ListAdapter adapter) {
getListView().setAdapter(adapter);
}
protected ListAdapter getListAdapter() {
ListAdapter adapter = getListView().getAdapter();
if (adapter instanceof HeaderViewListAdapter) {
return ((HeaderViewListAdapter) adapter).getWrappedAdapter();
} else {
return adapter;
}
}
private void deleteList()
{
if (!items.isEmpty())
{
items.clear();
}
lv.invalidateViews();
}
private void deleteCheckedItems()
{
SparseBooleanArray checked = lv.getCheckedItemPositions();
for(int i = 0; i < lv.getCount(); i++)
{
if (checked.get(i)==true)
{
items.remove(i);
}
lv.invalidateViews();
}
lv.clearChoices();
}
private void saveList(ArrayList<Item> itemlist) {
try {
OutputStreamWriter out = new OutputStreamWriter(openFileOutput(sFile, 0));
int iCnt = 0;
String allstring = "";
for (Item s : items)
{
if (s.isChecked)
{
iCnt++;
if (iCnt < items.size()) {
String thisstring;
thisstring = s.name + "\r\n";
out.write(thisstring);
allstring += thisstring;
} else {
String thisstring;
thisstring = s.name;
out.write(thisstring);
allstring += thisstring;
}
}
}
out.close();
//Toast.makeText(activity, allstring + " Written", duration).show();
}
catch (java.io.FileNotFoundException e)
{
}
catch (Exception ex)
{
// Toast.makeText(activity, "Write Exception : " + ex.getMessage(), duration).show();
}
}
public String readFile(ArrayList<Item> itemsList)
{
String sRet = "Nothing";
try
{
InputStream is = openFileInput(sFile);
if (is != null)
{
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String sLine;
StringBuffer sb = new StringBuffer();
while ((sLine = br.readLine()) != null)
sb.append(sLine + "\r\n");
is.close();
sRet = sb.toString();
// Toast.makeText(Toast.LENGTH_LONG).show();
}
}
catch (java.io.FileNotFoundException e)
{
}
catch (Exception ex)
{
// Toast.makeText(activi"Read Exception" + ex.getMessage(), Toast.LENGTH_LONG).show();
}
return sRet;
}
private void addItemDialog()
{
LayoutInflater inflater = LayoutInflater.from(this);
final View addView = inflater.inflate(R.layout.add, null);
new AlertDialog.Builder(this)
.setTitle("Add Item")
.setView(addView)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
EditText txtAdd = (EditText) addView.findViewById(R.id.etInput);
String sItem = (txtAdd).getText().toString();
items.add(new Item(sItem));
for (int i = 0; i < items.size(); i++)
{
lv.setItemChecked(i, items.get(i).isChecked);
}
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
}).show();
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setListAdapter(new ArrayAdapter<Item>(this, android.R.layout.simple_list_item_multiple_choice, items));
lv = this.getListView();
for (int i = 0; i < items.size(); i++)
{
lv.setItemChecked(i, items.get(i).isChecked);
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
readFile(items);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case R.id.add_item:
addItemDialog();
return true;
case R.id.clear_all:
deleteList();
return true;
case R.id.clear_checked:
deleteCheckedItems();
return true;
case R.id.write:
saveList(items);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}

put your oncreate method above after declaration that means after this line
private static final String sFile = "Saved.txt";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
.......
.......
//your code
}
//other method
Read Android activity lifecyle for better understanding

Android listview adapter not showing content

I dont know where the problem is because everything is fine. There are no errors showing or nothing. I even did a System.out.println() on the adapter data to get its count and it shows. The problem is, the listview is not showing anything.
Here is my code: (Any pointers / help will be really appreciated) The adapter that needs help is answers_adapter
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_question);
c = this;
//define view controls
question = (EditText) findViewById(R.id.question);
answers = (ListView) findViewById(R.id.answers);
type = (Spinner) findViewById(R.id.type);
add_choice = (Button) findViewById(R.id.add_choice);
info = (TextView) findViewById(R.id.info);
optional = (CheckBox) findViewById(R.id.optional);
//default data preparation
add_choice.setEnabled(false);
final List<String> types = new ArrayList<>();
types.add("Free Text");
types.add("Free Number");
types.add("Date");
types.add("MultiChoice Text");
types.add("MultiChoice Images");
ArrayAdapter<String> types_adapter = new ArrayAdapter<String>(c,android.R.layout.simple_spinner_item, types);
types_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
type.setAdapter(types_adapter);
type.setSelection(0);
type.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String selection = types.get(position).trim().toLowerCase();
if (selection.contains("multi")) {
add_choice.setEnabled(true);
} else {
add_choice.setEnabled(false);
}
//reset the answer choices
answers_adapter.clear();
answers_adapter.notifyDataSetChanged();
info.setText("Answer Choices (" + answers_adapter.getCount() + ")");
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
type.setSelection(0);
}
});
answers_data = new ArrayList<>(); //Initialize array adapter data
//if this is a question edit, add question info
String editpredata = getIntent().getStringExtra(NewQuestions.EXTRA_MESSAGE);
editpredata_pos = Integer.parseInt(editpredata);
if (editpredata_pos > -1){
CustomListData epcd = NewQuestions.questions_adapter.getItem(editpredata_pos);
String epcd_QJSON = epcd.getMoreinfo();
try {
JSONObject epcdqobj = new JSONObject(epcd_QJSON);
question.setText(epcdqobj.getString("question"));
int types_pos = 0;
for (int i = 0;i<types.size();i++){
String type_str = types.get(i);
if (type_str.trim().toLowerCase().matches(epcdqobj.getString("type").trim().toLowerCase())){
types_pos = i;
}
}
type.setSelection(types_pos);
optional.setChecked(epcdqobj.getString("optional").toLowerCase().trim().matches("yes"));
if (epcdqobj.getString("multichoice_type").trim().length() > 0){
JSONArray epcdmulti = epcdqobj.getJSONArray("multichoices");
for (int i=0;i<epcdmulti.length();i++){
JSONObject spobj = epcdmulti.getJSONObject(i);
CustomListData epcdmcd = new CustomListData();
int epcdmcd_imgpos = isNumeric(spobj.getString("image").trim()) ? Integer.parseInt(spobj.getString("image")) : -1;
epcdmcd.setIcon(epcdmcd_imgpos < 0 ? R.drawable.choice : NewQuestion.ds[epcdmcd_imgpos]);
epcdmcd.setItem(spobj.getString("choice"));
epcdmcd.setDesc(spobj.getString("points"));
epcdmcd.setMoreinfo(spobj.getString("image").trim());
answers_data.add(epcdmcd);
}
}
}
catch (Exception e){
System.out.println("INTERNAL ERROR: --> (PREPARING DATA) " + t.exceptionString(e));
}
}
System.out.println(answers_data.size());
answers_adapter = new CustomListAdapter(((Activity)c), answers_data);
answers.setAdapter(answers_adapter);
answers.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
showDialogChoice("", position);
}
});
add_choice.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String selection = type.getSelectedItem().toString().toLowerCase().trim();
if (selection.contains("image")) {
showDialogChoice("image", -1);
} else {
showDialogChoice("", -1);
}
}
});
}
CustomListData
public class CustomListData {
private int icon;
private String item;
private String desc;
private String moreinfo;
public CustomListData(){};
public CustomListData(int icon, String item, String desc){
super();
this.icon = icon;
this.item = item;
this.desc = desc;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getItem() {
return item;
}
public void setItem(String item) {
this.item = item;
}
public int getIcon() {
return icon;
}
public void setIcon(int icon) {
this.icon = icon;
}
public String getMoreinfo() {
return moreinfo;
}
public void setMoreinfo(String moreinfo) {
this.moreinfo = moreinfo;
}
}