Develop Reference

Why do "selectedCountry", "selectedAge", "selectedGender" return null?

When I run my app and go to the "EditProfile" activity. And then, I will immediately receive the toast message "Something is wrong" which means, the variables "selectedCountry", "selectedAge", and "selectedGender" are null.
public class EditProfile extends AppCompatActivity {
UserInfo userInfo;
UserInfo profileDetails;
Spinner spinnerFrom;
Spinner spinnerAge;
Spinner spinnerGender;
EditText hobbyEdit;
Button btnDone;
TextView textView;
String selectedCountry;
String selectedAge;
String selectedGender;
DatabaseHelper mydb = new DatabaseHelper(this, "MyUsers", null, 5);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit_profile);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), Profile.class);
intent.putExtra("id", userInfo.getId());
intent.putExtra("username", userInfo.getUsername());
startActivity(intent);
}
});
Bundle extras = getIntent().getExtras();
int id = extras.getInt("id");
final String username = extras.getString("username");
// Username
userInfo = new UserInfo(id, username);
textView = (TextView) findViewById(R.id.usernameUnedit);
textView.setText(username);
// Country
spinnerFrom = (Spinner) findViewById(R.id.spinnerFrom);
Locale[] locales = Locale.getAvailableLocales();
final ArrayList<String> countries = new ArrayList<String>();
countries.add("-");
for (Locale locale : locales) {
String country = locale.getDisplayCountry();
if (country.trim().length() > 0 && !countries.contains(country)) {
countries.add(country);
}
}
Collections.sort(countries);
ArrayAdapter<String> countryAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, countries);
countryAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerFrom.setAdapter(countryAdapter);
spinnerFrom.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedCountry = parent.getItemAtPosition(position).toString();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
// Age
spinnerAge = (Spinner) findViewById(R.id.spinnerAge);
final ArrayList<String> ages = new ArrayList<String>();
ages.add("-");
for (int i = 18; i < 100; i++) {
ages.add(String.valueOf(i));
}
ArrayAdapter<String> ageAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, ages);
ageAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerAge.setAdapter(ageAdapter);
spinnerAge.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedAge = parent.getItemAtPosition(position).toString();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
// Gender
spinnerGender = (Spinner) findViewById(R.id.spinnerGender);
final ArrayList<String> genders = new ArrayList<String>();
genders.add("-");
genders.add("Male ♂");
genders.add("Female ♀");
genders.add("Other");
ArrayAdapter<String> genderAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, genders);
genderAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerGender.setAdapter(genderAdapter);
spinnerGender.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedGender = parent.getItemAtPosition(position).toString();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
// Hobby
hobbyEdit = (EditText) findViewById(R.id.hobbyEdit);
// Button done
btnDone = (Button) findViewById(R.id.btnDone);
btnDone.setEnabled(false);
/* Stuck at this if statement below */
if (selectedCountry != null && selectedAge != null && selectedGender != null) {
if (!mydb.isStoredProfileDetails(username, selectedCountry, selectedAge, selectedGender, hobbyEdit.getText().toString())) {
btnDone.setEnabled(true);
btnDone.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
profileDetails = new UserInfo(selectedCountry, selectedAge, selectedGender, hobbyEdit.getText().toString());
mydb.updateTable(username, profileDetails);
}
});
} else {
Toast.makeText(this, "Something is wrong 2.", Toast.LENGTH_LONG).show();
}
} else {
Toast.makeText(this, "Something is wrong.", Toast.LENGTH_LONG).show();
}
}
}
I expect that after choosing an item from those 3 dropdown lists (spinners) and the values of the chosen items do not exist in database, then the "Done" button would be clickable. Once the button is clicked, it would store the selected values from the dropdown lists (spinners) into database by updating it.
Unfortunately, I am stuck at the if statement as stated in the given code as it keeps returning the "else" statement.

Set your variable as...
String selectedCountry = "";
String selectedAge = "";
String selectedGender = "";
And check condition as...
if (!selectedCountry.equals("") && !selectedAge.equals("") && !selectedGender.equals("")) {
//your code goes here
}

You have to check your both conditions in Spinner's OnItemSelectedListener, If both conditions will return true then enable your button. and call setonClickListener on button in onCreateView, like this.
spinnerGender.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
selectedGender = parent.getItemAtPosition(position).toString();
//Conditions to enable button
if (selectedCountry != null && selectedAge != null && selectedGender != null) {
if (!mydb.isStoredProfileDetails(username, selectedCountry, selectedAge, selectedGender, hobbyEdit.getText().toString())) {
btnDone.setEnabled(true);
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
add these lines in all spinners.

In your onCreate method, you have instantiated the views and attached listeners to them. That is perfectly fine. However, this does not mean that the logic in those listeners will be execute at the same time and order. You have just defined the behaviour of the listeners. After all that initialisation, your code directly checks the values of the three Strings mentioned in your question. It does not wait for a user to interact with the spinners.
What you want is to trigger the change in the "done" button when a user selects something from the spinner. So the logic of setting the strings and thereby checking if you could enable the "done" button must go in the listeners of the spinners.
I am not giving you a direct code solution to the problem, but an approach which you could employ.

Update TAB 2 Recyclerview When Data Added in TAB 1's RecyclerView

I have kind of to-do app. In profile activity, there are 2 tabs.
To-do and Done. In Tab 1, user can check as "done" of their "to-do". In this case, I want to update TAB 2's recyclerview.
I tried several things, but didn't work. Here is TAB 1 codes, it's almost same as TAB 2.
TAB 1 Class
public class Tab_Profile_1 extends Fragment {
private RecyclerView recyclerView_tab_todo;
private List<Model_ListItem> itemList;
private Adapter_Profile_ToDo adapter_profile_toDo;
SharedPreferences mSharedPref;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_profile_tab_1, container, false);
//TO-DO
//
recyclerView_tab_todo = view.findViewById(R.id.recyclerView_tab_todo);
//
fetchUserToDo();
return view;
}
public void fetchUserToDo() {
itemList = new ArrayList<>();
//First Settings
mSharedPref = PreferenceManager.getDefaultSharedPreferences(getContext());
String session_user_id = mSharedPref.getString("session_user_id", "");
API_Service api_service = Client.getRetrofitInstance().create(API_Service.class);
Call<List<Model_ListItem>> call = api_service.fetchUserToDo(session_user_id);
call.enqueue(new Callback<List<Model_ListItem>>() {
#Override
public void onResponse(Call<List<Model_ListItem>> call, Response<List<Model_ListItem>> response) {
itemList = response.body();
adapter_profile_toDo = new Adapter_Profile_ToDo(getContext(), itemList);
recyclerView_tab_todo.setHasFixedSize(true);
LinearLayoutManager layoutManager
= new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
recyclerView_tab_todo.setLayoutManager(layoutManager);
recyclerView_tab_todo.setAdapter(adapter_profile_toDo);
}
#Override
public void onFailure(Call<List<Model_ListItem>> call, Throwable t) {
}
});
}}
TAB 1 RecyclerView Adapter
public class Adapter_Profile_ToDo extends RecyclerView.Adapter {
private Context context;
private List<Model_ListItem> itemList;
private String url_extension_images = URL_Extension.url_extension_images;
SharedPreferences mSharedPref;
ProgressDialog progressDialog;
View view;
public Adapter_Profile_ToDo(Context context, List<Model_ListItem> itemList) {
this.context = context;
this.itemList = itemList;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_profile_todo, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, final int position) {
Glide.with(context).load(url_extension_images + itemList.get(position).getItem_image()).into(holder.imageView_profile_todo);
holder.textView_profile_todo_name.setText(itemList.get(position).getItem_name());
holder.textView_profile_todo_desc.setText(itemList.get(position).getItem_description());
holder.layout_profile_todo_detail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//detail
}
});
holder.layout_profile_todo_add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final AlertDialog.Builder builder = new AlertDialog.Builder(view.getRootView().getContext(), R.style.AlertStyle);
builder.setTitle("\"" + itemList.get(position).getItem_name() + "\"" + "\n");
builder.setIcon(R.drawable.ic_bookmark);
builder.setPositiveButton("YAPTIM", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
showProgressDialog();
addDone("" + itemList.get(position).getItem_id(), position);
}
});
builder.setNegativeButton("SİL", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
showProgressDialog();
deleteUserToDo("" + itemList.get(position).getItem_id(), position);
}
});
builder.setNeutralButton("İptal", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.show();
}
});
}
#Override
public int getItemCount() {
return itemList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView imageView_profile_todo;
TextView textView_profile_todo_name, textView_profile_todo_desc;
LinearLayout layout_profile_todo_detail, layout_profile_todo_add;
public ViewHolder(View itemView) {
super(itemView);
imageView_profile_todo = itemView.findViewById(R.id.imageView_profile_todo);
textView_profile_todo_name = itemView.findViewById(R.id.textView_profile_todo_name);
textView_profile_todo_desc = itemView.findViewById(R.id.textView_profile_todo_desc);
layout_profile_todo_detail = itemView.findViewById(R.id.layout_profile_todo_detail);
layout_profile_todo_add = itemView.findViewById(R.id.layout_profile_todo_add);
}
}
public void deleteUserToDo(final String listId, final int clicked) {
mSharedPref = PreferenceManager.getDefaultSharedPreferences(context);
String session_user_id = mSharedPref.getString("session_user_id", "");
API_Service api_service = Client.getRetrofitInstance().create(API_Service.class);
Call<Response_Success> call = api_service.deleteUserToDo(session_user_id, listId);
call.enqueue(new Callback<Response_Success>() {
#Override
public void onResponse(Call<Response_Success> call, Response<Response_Success> response) {
if (response.code() == 200) {
if (progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
}
if (response.body().getSuccess().matches("true")) {
Toast.makeText(context, "Silindi!", Toast.LENGTH_SHORT).show();
itemList.remove(itemList.get(clicked));
notifyItemRemoved(clicked);
notifyItemRangeChanged(clicked, itemList.size());
} else {
Toast.makeText(context, "Bilinmeyen bir hata oluştu!", Toast.LENGTH_SHORT).show();
}
}
}
#Override
public void onFailure(Call<Response_Success> call, Throwable t) {
Toast.makeText(context, "Bilinmeyen bir hata oluştu!", Toast.LENGTH_SHORT).show();
}
});
}
public void addDone(String listId, final int clicked) {
mSharedPref = PreferenceManager.getDefaultSharedPreferences(context);
String session_user_id = mSharedPref.getString("session_user_id", "");
API_Service apiService = Client.getRetrofitInstance().create(API_Service.class);
Call<Response_Success> call = apiService.addDone(session_user_id, listId);
call.enqueue(new Callback<Response_Success>() {
#Override
public void onResponse(Call<Response_Success> call, Response<Response_Success> response) {
if (response.code() == 200) {
if (progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
}
if (response.body().getSuccess().matches("true")) {
Toast.makeText(context, "Eklendi", Toast.LENGTH_SHORT).show();
itemList.remove(itemList.get(clicked));
notifyItemRemoved(clicked);
notifyItemRangeChanged(clicked, itemList.size());
} else {
Toast.makeText(context, "Bilinmeyen bir hata oluştu!", Toast.LENGTH_SHORT).show();
}
}
}
#Override
public void onFailure(Call<Response_Success> call, Throwable t) {
}
});
}
public void showProgressDialog() {
progressDialog = new ProgressDialog(view.getRootView().getContext());
progressDialog.setMessage("Yükleniyor");
progressDialog.setCancelable(false);
progressDialog.show();
}
}

If i'm reading this correctly, you have two tabs and a backend database that stores the to do items and their state? To get the second list to update, you just need to do the same thing that you're doing in your first list, and update the adapter's data set and notify that the data set changed. How you trigger this action in your second tab is really the question.
You can either use an interface and have your adapter notify your activity that recycler view 1 had an action on it, and you can then tell adapter 2 to update its data. You can either pass back the data and only notify one row, or you could notify the entire data set. If you're doing this all service based, you could just reload the recycler view from the service and it will have the new data.
I think all you need to figure out is how you want to notify tab 2 that it needs to update its data. My recommendation is:
public interface AdapterInterface
{
void itemCompleted(Item hereIsTheItemThatNeedsToBeAddedTo2);
}
Then inside your adapter have a property with getters/setters such as:
private AdapterInterface adapterInterfaceListener;
Inside your Fragment/Activity implement AdapterInterface and implement the itemCompleted function.
And then set your adapter.setAdapterInterfaceLisetener to that function that you implemented. Then inside your adapter when the user clicks the checkbook to mark it as done, you can call the adapterInterfaceListener.itemCompleted() function, and it will send that information to your Fragment/Activity. From there you can give that new data to adapter2, or recall the API, however you want to get the new data.
Does this help?

Recyclerview sqllite update only works on first item on the list

I have a list of items that are displayed in a recylcerview in my adapter class i implmented a onlongclick method, when used it opens up a new alertdialog, when i press on the selected item in the alterdialog im calling updateList() function that is supposed to update the selected item the problem is this only works for the first item displayed in my list, so in exmaple if i pressed the 10th item on the list said item wont update.
Update function
public boolean updateList(long rowId, String stanje) {
ContentValues newValues = new ContentValues();
newValues.put(TABELA_STOLPEC_STANJE,stanje);
return db.update(TABELA_IME,newValues,TABELA_STOLPEC_ID+"="+rowId,null)>0;
}
OnlongClickListener this method is in my fragment class.
mmAdapter.setOnLongClick(new ToDoRecyclerViewAdapter.OnLongClickListener_() {
#Override
public void onLongClick(long i,String item) {
if(item.equals("doing")) {
boolean update_1 = db.updateList(i, item);
if(update_1) {
android.support.v4.app.FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.detach(TodoFragment.this).attach(TodoFragment.this).commit();
Toast.makeText(getContext(), "Dodano v bazo.!", Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(getContext(), "Prislo je do napake!", Toast.LENGTH_SHORT).show();
}
}
}
});
onlongclicklistener implementation in my adapter class
holder.mView.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(final View v) {
AlertDialog.Builder adb = new AlertDialog.Builder(v.getContext());
CharSequence meni[] = new CharSequence[] {"DOING"};
adb.setItems(meni, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
if(i == 0) {
mValues.get(i).setStanje("doing");
clickLinster_.onLongClick(mValues.get(position).getId_(),mValues.get(position).getStanje());
}
}
});
AlertDialog alertDialog = adb.create();
alertDialog.setCancelable(true);
alertDialog.show();
return true;
}
});
public interface OnLongClickListener_ {
void onLongClick(long i, String item);
}

The reason is simple, you are updating wrong row with index, correct solution:
#Override
public void onBindViewHolder(#NonNull final CustomViewHolder holder, int position) {
//Rest of onBindViewHolder code
holder.mView.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(final View v) {
final int pos = holder.getAdapterPosition();
AlertDialog.Builder adb = new AlertDialog.Builder(v.getContext());
CharSequence meni[] = new CharSequence[] {"DOING"};
adb.setItems(meni, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
if(i == 0) {
mValues.get(pos).setStanje("doing");
clickLinster_.onLongClick(mValues.get(pos).getId_(),mValues.get(pos).getStanje());
}
}
});
AlertDialog alertDialog = adb.create();
alertDialog.setCancelable(true);
alertDialog.show();
return true;
}
});
}

Item not deleting from sharedpreferences

I have a list that I saved in sharedpreferences I want to delete an item from the listview when the user longclicks so on the long click the app prompts you with a question to delete or not when you confirm it deletes it. This works but when i come back to the activity the list still contains that item that has been deleted
This is the code for the onCreateView. tinyDB is sharedprefrences.Thank you
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_tab_secondsemester, container, false);
btnAddNew = (Button)rootView.findViewById(R.id.btnAddNewYearOneSecondSemester);
listView = (ListView)rootView.findViewById(R.id.listViewSubjectsMyCoursesSecondSemester);
tinyDB = new TinyDB(getContext());
storedList = new ArrayList<>(tinyDB.getListString("storedList"));
generalList = new ArrayList<>();
spinnerValues = new ArrayList<>();
getActivity().setTitle("Year One");
setHasOptionsMenu(true);
btnAddNew.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(getContext(),R.style.DialogeTheme);
// Setting Dialog Title
alertDialog.setTitle("Add new");
// Setting Dialog Message
String getUsername = tinyDB.getString("Username");
alertDialog.setMessage("Hello "+ getUsername + ", please write the new subject");
final EditText input = new EditText(getContext());
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
input.setTextColor(Color.parseColor("#f06292"));
alertDialog.setView(input);
alertDialog.setPositiveButton("Add", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
String getSubjectInput = input.getText().toString();
storedList.add(getSubjectInput);
tinyDB.putListString("storedList", storedList);
arrayAdapter.notifyDataSetChanged();
}
});
alertDialog.setNegativeButton("CANCEL",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to execute after dialog
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.create();
alertDialog.show();
}
});
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(final AdapterView<?> adapterView, View view, final int i, long l) {
new SweetAlertDialog(getContext(), SweetAlertDialog.WARNING_TYPE)
.setTitleText("Delete")
.setContentText("Are you sure you want to delete this course")
.setConfirmText("YES")
.setCancelText("NO")
.setConfirmClickListener(new SweetAlertDialog.OnSweetClickListener() {
#Override
public void onClick(SweetAlertDialog sweetAlertDialog) {
storedList.remove(i);
arrayAdapter.notifyDataSetChanged();
tinyDB.registerOnSharedPreferenceChangeListener(new SharedPreferences.OnSharedPreferenceChangeListener() {
#Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String s) {
arrayAdapter.notifyDataSetChanged();
}
});
sweetAlertDialog.dismiss();
}
})
.setCancelClickListener(new SweetAlertDialog.OnSweetClickListener() {
#Override
public void onClick(SweetAlertDialog sweetAlertDialog) {
sweetAlertDialog.dismiss();
}
})
.show();
return true;
}
});
arrayAdapter = new CustomListAdapter(getContext(),storedList);
listView.setAdapter(arrayAdapter);
arrayAdapter.notifyDataSetChanged();
return rootView;
}

Use this when the user deletes it
public void removeAt(int position) {
mDataset.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, mDataSet.size());
}
mDataset is the array/list in which you save all the data for the adapter

Why my listview is empty?

I have a arraylist in which users can input their text. And it is displayed in the screen as a listview. That works, but when i try to get the values of the arraylist it says that: Invalid index 0, size is 0. So im guessing for some reason the listview isnt populating?
This is how I add values to the list:
public class ZaidejaiActivity extends ActionBarActivity implements View.OnClickListener{
public Button mBtnIstrinti;
public Button mBtnPrideti;
public Button mBtnPradeti;
public EditText mYrasytiVarda;
public ListView mZaidejai;
ArrayList<String> list = new ArrayList<String>();
ArrayAdapter<String> adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_zaidejai);
mBtnPrideti = (Button) findViewById(R.id.pridėtiBtn);
mBtnPrideti.setOnClickListener(this);
mYrasytiVarda = (EditText) findViewById(R.id.VardoYrasymoBtn);
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, list);
// set the mZaidejai variable to your list in the xml
mZaidejai = (ListView) findViewById(R.id.sarašas);
mZaidejai.setAdapter(adapter);
mZaidejai.setOnItemClickListener(new AdapterView.OnItemClickListener() {
// remove item from List.
#Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
list.remove(position);
AlertDialog.Builder builder = new AlertDialog.Builder(ZaidejaiActivity.this);
builder.setMessage("Delete?");
builder.setTitle("Confirm Action");
builder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
adapter.notifyDataSetChanged();
}
//checked.clear();
});
builder.setNegativeButton("Cancel", null);
builder.create();
builder.show();
}
});
mBtnPradeti = (Button) findViewById(R.id.žaistiBtn);
mBtnPradeti.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// count items
int i;
for (i = adapter.getCount() - 1; i >= 0; i--) {
String obj = adapter.getItem(i);
// send items to other activity
Intent pradetiZaidima = new Intent(v.getContext(), ZaidimasActivity.class);
pradetiZaidima.putExtra("playerList", obj);
startActivity(pradetiZaidima);
}
}
});
}
#Override
public void onClick(View v) {
String input = mYrasytiVarda.getText().toString();
if(input.length() > 0)
{
// add string to the adapter, not the listview
adapter.add(input);
// no need to call adapter.notifyDataSetChanged(); as it is done by the adapter.add() method
}else{
AlertDialog alertDialog = new AlertDialog.Builder(this).create();
alertDialog.setTitle("Klaida:");
alertDialog.setMessage("Blogai yrašytas vardas");
alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// here you can add functions
}
});
alertDialog.show();
}
}
EDIT
In this activity I want to get the values of the list:
public class ZaidimasActivity extends ZaidejaiActivity {
public TextView mZaidejas;
public TextView mKlausimas;
public Button mKitasKlausimas;
public Button mGryzti;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_zaidimas);
/** //get the player list from ZaidejaiActivity
Bundle recdData = getIntent().getExtras();
String myVal = recdData.getString("playerList"); */
//show the first players name
mZaidejas = (TextView)findViewById(R.id.ZaidejoVardas);
mZaidejas.setText(list.get(0));
/** mGryzti = (Button)findViewById(R.id.GryztiMeniuBtn);
mKitasKlausimas = (Button)findViewById(R.id.KitasBtn);
mKitasKlausimas.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
*/

Unfortunately your list==empty. So add some values on it.
list.add("ABC");
list.add("XYZ");
and then setAdapter
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, list);
mZaidejai = (ListView) findViewById(R.id.sarašas);
mZaidejai.setAdapter(adapter);

Your not adding any values to it. And your list is empty and add some values to it like list.add("hyd");
list.add("city");
and pass those values to adapter

Rather doing
adapter.add(input);
Do
list.add(input);
adapter.notifyDataSetChanged();

So, as others have said you should change the adapter.add(input); on the onClick method to
list.add(input);
adapter.notifyDataSetChanged();
Also, on an unrelated matter, you should really move the list.remove(position); call to the following onClick method of the positive button, before the adapter.notifyDataSetChanged(); call, so it wont be removed if the user cancels the action :)

at the first time your list adapter is empty (getCount() = 0) and you do -1 in the for
mBtnPradeti.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// count items
int i;
if (adapter.getCount() > 0)
{
for (i = adapter.getCount() - 1; i >= 0; i--) {
String obj = adapter.getItem(i);
// send items to other activity
Intent pradetiZaidima = new Intent(v.getContext(), ZaidimasActivity.class);
pradetiZaidima.putExtra("playerList", obj);
startActivity(pradetiZaidima);
}
}
}
});
and for this code :
mZaidejas.setText(list.get(0));
but on Create your list is empty !!!