Passing data from Activity to Fragment does not work - java

I have been doing an app that needs a profile page. the login is an activity and the profile page is fragment. whenever I do the passing, it always returns null.
here is my MainActivity.java
public class MainActivity extends Activity {
ConnectionClass connectionClass;
EditText edtuserid,edtpass;
Button btnlogin;
ProgressBar pbbar;
public int test2;
public String test3 = "";
String user_fname;
String user_lname;
int dept_id;
String test;
String user_email;
String user_password;
String user_username;
Bundle profileBundle;
String userid;
String password;
int userIDD;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
connectionClass = new ConnectionClass();
edtuserid = (EditText) findViewById(R.id.edtuserid);
edtpass = (EditText) findViewById(R.id.edtpass);
btnlogin = (Button) findViewById(R.id.btnlogin);
pbbar = (ProgressBar) findViewById(R.id.pbbar);
pbbar.setVisibility(View.GONE);
edtuserid.setText(test3);
btnlogin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
userid = edtuserid.getText().toString();
password = edtpass.getText().toString();
DoLogin doLogin = new DoLogin();
doLogin.execute("");
}
});
}
public class DoLogin extends AsyncTask<String,String,String>
{
int b;
String z = "";
Boolean isSuccess = false;
#Override
public void onPreExecute() {
pbbar.setVisibility(View.VISIBLE);
}
#Override
public void onPostExecute(String r) {
pbbar.setVisibility(View.GONE);
if(isSuccess) {
//DITO ANG REDIRECTION
Intent base = new Intent(MainActivity.this, OtherActivity.class);
startActivity(base);
finish();
}
}
#Override
public String doInBackground(String... params) {
if(userid.trim().equals("")|| password.trim().equals(""))
z = "Please enter User Id and Password";
else
{
try {
Connection con = connectionClass.CONN();
if (con == null) {
z = "Error in connection with SQL server";
} else {
String query = "select user_id, user_fname, user_lname, department_id, user_email, user_password, user_username from users where user_id='" + userid + "' and user_password='" + password + "'";
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
if(rs.next())
{
userIDD = rs.getInt(1);
Bundle profileBundle = new Bundle();
profileBundle.putInt("userID", userIDD);
PathfinderAdd fragobj = new PathfinderAdd();
fragobj.setArguments(profileBundle);
z = "The ID is " + userIDD;
isSuccess=true;
}
else
{
z = "Invalid Credentials";
isSuccess = false;
}
}
}
catch (Exception ex)
{
isSuccess = false;
z = "Error Somewhere";
Log.e("MYAPP", "exception", ex);
}
}
return z;
}
}
public String getMyData() {
String test4 = test3;
return test4;
}
}
And in the fragment, I retrieve the data as:
PathfinderAdd.java
public class PathfinderAdd extends Fragment {
ConnectionClass connectionClass;
EditText edtideaname, edtbenefit,edtobservation,edtquickwin,targetdate;
Button btnadd;
TextView targettv;
Spinner spinner1, spinner2;
ProgressBar pbbar;
String proid;
CalendarView calendar;
String realDate;
String DAY;
Date targ = null;
String finalDate;
SimpleDateFormat timeFormat;
java.sql.Date sql;
Date date2;
int userID = 0;
int user = 0;
public PathfinderAdd(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.addpathfinder, container, false);
connectionClass = new ConnectionClass();
edtideaname = (EditText) rootView.findViewById(R.id.edtideaname);
edtbenefit = (EditText) rootView.findViewById(R.id.edtbenefit);
edtobservation = (EditText) rootView.findViewById(R.id.edyobservation);
edtquickwin = (EditText) rootView.findViewById(R.id.edtquickwin);
targetdate = (EditText) rootView.findViewById(R.id.target);
spinner1 = (Spinner) rootView.findViewById(R.id.spinner1);
spinner2 = (Spinner) rootView.findViewById(R.id.spinner2);
btnadd = (Button) rootView.findViewById(R.id.btnadd);
pbbar = (ProgressBar) rootView.findViewById(R.id.pbbar);
targettv = (TextView) rootView.findViewById(R.id.tvtarget);
pbbar.setVisibility(View.GONE);
calendar = (CalendarView) rootView.findViewById(R.id.calendar1);
proid = "";
//String userId = ((MainActivity)getActivity()).IDD;
MainActivity getID = new MainActivity();
String IDD = getID.getMyData();
Toast.makeText(PathfinderAdd.this.getActivity(), IDD, Toast.LENGTH_SHORT).show();
btnadd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
AddPro addPro = new AddPro();
addPro.execute("");
}
});
calendar.setOnDateChangeListener(new OnDateChangeListener() {
public void onSelectedDayChange(CalendarView view, int year_date, int month_date,
int dayOfMonth) {
int day = dayOfMonth;
int month = month_date;
int year = year_date;
DAY=String.valueOf(year)+String.valueOf(month)+String.valueOf(day);
}
});
return rootView;
}
public class AddPro extends AsyncTask<String, String, String> {
String z = "";
Boolean isSuccess = false;
String observation = edtobservation.getText().toString();
String quickwin = edtquickwin.getText().toString();
String ideaname = edtideaname.getText().toString();
String benefit = edtbenefit.getText().toString();
String target_date = targetdate.getText().toString();
String process = spinner1.getSelectedItem().toString();
String benefitType = spinner2.getSelectedItem().toString();
String lol = "2015-11-28";
Integer benefit_type = spinner2.getSelectedItemPosition();
Integer idea_type = spinner1.getSelectedItemPosition();
Integer idea_id;
Integer benefit_id;
Integer pathfinder_id = 1;
Integer pathfinder_status = 9;
Integer pathfinder_prog = 0;
#Override
protected void onPreExecute() {
pbbar.setVisibility(View.VISIBLE);
}
#Override
protected void onPostExecute(String r) {
pbbar.setVisibility(View.GONE);
Toast.makeText(PathfinderAdd.this.getActivity(), r, Toast.LENGTH_SHORT).show();
if(isSuccess==true) {
edtideaname.setText(null);
edtbenefit.setText(null);
edtobservation.setText(null);
edtquickwin.setText(null);
targetdate.setText(null);
}
}
#Override
protected String doInBackground(String... params) {
if (ideaname.trim().equals("") || benefit.isEmpty() || observation.trim().equals("") || quickwin.trim().equals(""))
z = "Please fill all the fields";
else {
try {
Connection con = connectionClass.CONN();
if (con == null) {
z = "Error in connection with SQL server";
} else {
//timeFormat = new SimpleDateFormat("yyyy-MM-dd",Locale.ENGLISH);
//finalDate = timeFormat.format(targ);
//sql = new java.sql.Date(targ.getTime());
int lol=1;
double benefitInt = Double.parseDouble(benefit);
date2 = new SimpleDateFormat("yyyyMMdd", Locale.ENGLISH).parse(DAY);
String newDateString = new SimpleDateFormat("yyyy/MM/dd",Locale.ENGLISH).format(date2);
DateFormat format2 = new SimpleDateFormat("yyyy/MM/dd", Locale.ENGLISH);
Date date3 = format2.parse(newDateString);
String dates = new SimpleDateFormat("yyyy/MM/dd", Locale.ENGLISH)
.format(Calendar.getInstance().getTime());
//String date = new SimpleDateFormat("yyyy/MM/dd", Locale.ENGLISH)
//.format(calendar.getDate());
switch (idea_type)
{
case 0:
idea_id = 1;
break;
case 1:
idea_id = 2;
break;
case 2:
idea_id = 3;
break;
case 3:
idea_id = 4;
break;
case 4:
idea_id = 5;
break;
default:
idea_id = 1;
break;
}
switch(benefit_type)
{
case 0:
benefit_id = 1;
break;
case 1:
benefit_id = 2;
break;
default:
benefit_id = 1;
break;
}
String query = "insert into pathfinder (pathfinder_id,pathfinder_name,idea_id,benefit_id,pathfinder_potential_eqv,pathfinder_observation,pathfinder_quickwin,pathfinder_target_closure,pathfinder_status,pathfinder_progress,patfinder_actual_closure,pathfinder_date_raised,user_id)" +
"values ('" +pathfinder_id+ "','" +ideaname+ "','" +idea_id+ "','" +benefit_id+ "','" +benefitInt+ "','" +observation+ "','" +quickwin+ "','" +dates+ "','" +pathfinder_status+ "','" +pathfinder_prog+ "','" +dates+ "','" +dates+ "','" + user+"')";
PreparedStatement preparedStatement = con.prepareStatement(query);
preparedStatement.executeUpdate();
z = "Added Successfully";
isSuccess = true;
}
} catch (Exception ex) {
isSuccess = false;
z = "Exceptions";
Log.e("MYAPP", "exception", ex);
}
}
return z;
}
}
}
the problem is that whenever this code executes, i get a null value. I have also tried assigning it to a method but it still returns null.


you must use same object for going to fragment. i think you used another object of fragment for transaction that's why it is showing null.
it have to be somewhat like this
PathfinderAdd fragobj = new PathfinderAdd();
fragobj.setArguments(profileBundle);
getSupportFragmentManager().beginTransaction().add(R.id.container , fragobj).commit();


You can also do this without passing data to fragment. You can directly get data from your main Activity like this. In your main Activity just do this.
if(rs.next())
{
userIDD = rs.getInt(1);
user_fname = rs.getString(2);
user_lname = rs.getString(3);
dept_id = rs.getInt(4);
user_email = rs.getString(5);
user_password = rs.getString(6);
user_username = rs.getString(7);
}
Then in your Fragment get values like this:
userId = ((YourActivity)getActivity()).userIDD;
Make sure your veriables are activity global.


If you are using a static fragment, setArguments() simply won't work. You need to set arguments for a transaction before you do a beginTransaction() in your fragmentManager. If you do it after that, then also setArguments() won't work

Related

Layout Refresh issues in Activity with Tabs

Its an Activity with Tabs, I'm getting data from API using Volley library. There is only one Fragment. Whenever Tab is changed either by sliding or clicking the Tab, the function that calls the APIs is called with different data.
Problems:
1) It loads items every time on working internet, but it sometimes shows and sometimes not. When I press home button (i.e. activity is running and in background) and then select the app from opened apps list it shows data. I've to pause and resume app to view changes by pressing home button and reselecting from opened apps. If I lock screen and unlock screen then also it shows the content.
2) Similar to problem 1) there is an info button on top right corner it shows/hides a layout when clicked. But some time when problem 1) occurs it also behaves same.
3) Also looks similar to 1) and 2) there is TextView (Options) that shows/hides a layout when clicked But some time when problem 1) occurs it also behaves same.
Any help would be appreciated, I'm running out of time...
Here is screenshot: Screenshot
RestaurantDetailActivity.java
public class RestaurantDetailActivity extends AppCompatActivity {
LinearLayout contactLayout;
TabLayout tabLayout;
ViewPager viewPager;
TextView nameTv, descrTv, timingsTv, totalRatingsTv;
RatingBar ratingsRb;
ImageView restaurantIv;
String resId;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_restaurant_detail);
//get data from previews activity
Intent intent = getIntent();
//init views
nameTv = findViewById(R.id.nameTv);
ratingsRb = findViewById(R.id.ratingsRb);
descrTv = findViewById(R.id.descrTv);
timingsTv = findViewById(R.id.timingsTv);
totalRatingsTv = findViewById(R.id.totalRatingsTv);
contactLayout = findViewById(R.id.contactLayout);
tabLayout = findViewById(R.id.tabLayout);
viewPager = findViewById(R.id.viewPager);
timingsTv = findViewById(R.id.timingsTv);
restaurantIv = findViewById(R.id.restaurantIv);
resId = intent.getStringExtra("id");
//setup tabs
setupViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
final String name = intent.getStringExtra("name");
final String ratings = intent.getStringExtra("ratings");
String description = intent.getStringExtra("description");
String status = intent.getStringExtra("status");
String resPaused = intent.getStringExtra("resPaused");
String open = intent.getStringExtra("openTime");
String close = intent.getStringExtra("closeTime");
//set data in header
nameTv.setText(name);
ratingsRb.setRating(Float.parseFloat(ratings));
descrTv.setText(description);
final String timings;
if (resPaused.equals("0")) {
timings = con24to12(open) + " - " + con24to12(close);timingsTv.setTextColor(getApplicationContext().getResources().getColor(R.color.colorWhite));
} else {
timings = "Closed Today";
timingsTv.setTextColor(getApplicationContext().getResources().getColor(R.color.colorRadish));
}
//set timings
if (Utils.compareOpenTime(open)) {
timingsTv.setTextColor(getApplicationContext().getResources().getColor(R.color.colorWhite));
timingsTv.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_time_white, 0, 0, 0);
timingsTv.setText(con24to12(open));
} else {
timingsTv.setText(timings);
}
totalRatingsTv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent1 = new Intent(getApplicationContext(), RestaurantReviewsActivity.class);
intent1.putExtra("restId", resId);
intent1.putExtra("restName", name);
intent1.putExtra("restRatings", ratings);
startActivity(intent1);
}
});
final Bitmap b = BitmapFactory.decodeFile(getExternalCacheDir() + "/TopServeImages" + "/" + intent.getStringExtra("image"));
restaurantIv.setImageBitmap(b);
}
ViewPagerAdapter adapter;
private void setupViewPager(ViewPager viewPager) {
adapter = new ViewPagerAdapter(getSupportFragmentManager());
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Getting Menu...");
progressDialog.show();
String token = "auth" + System.currentTimeMillis();
Map<String, String> params = new HashMap<>();
params.put("Token", token);
params.put("RestaurantID", resId);
Log.d("TheToken", Utils.getToken() + "" + Utils.getEmail());
String url = ApiManager.headerUrl + ApiManager.menuItemsUrl;
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.POST,
url, new JSONObject(params),
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
progressDialog.dismiss();
Log.d("TheResponse", response.toString());
try {
JSONObject jsonObject = response.getJSONObject("Response");
JSONArray jsonArray = jsonObject.getJSONArray("MenuCategories");
for (int i = 0; i < jsonArray.length(); i++) {
String menuItemCategoryID = jsonArray.getJSONObject(i).getString("MenuItemCategoryID");
String name = jsonArray.getJSONObject(i).getString("Name");
String restaurantID = jsonArray.getJSONObject(i).getString("RestaurantID");
adapter.addFragment(RestaurantFragment.newInstance((i + 1), "" + name, restaurantID, menuItemCategoryID), "" + name);
adapter.notifyDataSetChanged();
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "Exception: " + e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
progressDialog.dismiss();
try {
if (error.getMessage().toLowerCase().contains("no address associated with hostname")) {
Toast.makeText(getApplicationContext(), "Slow or no Internet connection...", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "Error: " + e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
});
Volley.newRequestQueue(this).add(jsonObjReq);
viewPager.setAdapter(adapter);
}
public class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> fragmentList = new ArrayList<>();
private final List<String> fragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return fragmentList.get(position);
}
#Override
public int getCount() {
return fragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
fragmentList.add(fragment);
fragmentTitleList.add(title);
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return fragmentTitleList.get(position);
}
}
public void clicks(View view) {
if (view == findViewById(R.id.backTv)) {
onBackPressed();
} else if (view == findViewById(R.id.infoBtn)) {
if (contactLayout.getVisibility() == View.GONE) {
contactLayout.setVisibility(View.VISIBLE);
} else {
contactLayout.setVisibility(View.GONE);
}
}
}
public String con24to12(String from) {
DateFormat df = new SimpleDateFormat("HH:mm:ss");
DateFormat outputformat = new SimpleDateFormat("hh:mm aa");
Date date = null;
String output = null;
try {
date = df.parse(from);
output = outputformat.format(date);
from = output;
} catch (Exception pe) {
Toast.makeText(getApplicationContext(), "" + pe.getMessage(), Toast.LENGTH_SHORT).show();
}
return from;
}
}
RestaurantFragment.java
public class RestaurantFragment extends Fragment {
String title;
int page;
String restaurantId;
String menuItemCategoryID;
AdapterMenu mAdapter;
List<ModelMenu> menuList;
ImageView fabCartIv;
RecyclerView recyclerView;
public RestaurantFragment() {
}
public static RestaurantFragment newInstance(int page, String title, String restID, String menuItemCategoryID) {
RestaurantFragment fragmentFirst = new RestaurantFragment();
Bundle args = new Bundle();
args.putInt("someInt", page);
args.putString("someTitle", title);
args.putString("restId", restID);
args.putString("menuItemCategoryID", menuItemCategoryID);
fragmentFirst.setArguments(args);
return fragmentFirst;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
page = getArguments().getInt("someInt", 0);
title = getArguments().getString("someTitle");
restaurantId = getArguments().getString("restId");
menuItemCategoryID = getArguments().getString("menuItemCategoryID");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_restaurant, container, false);
recyclerView = view.findViewById(R.id.menuRecyclerView);
fabCartIv = view.findViewById(R.id.fabCartIv);
loadMenuItems();
return view;
}
private void loadMenuItems() {
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity().getApplicationContext()));
menuList = new ArrayList<>();
String token = "auth" + System.currentTimeMillis();
Map<String, String> params = new HashMap<>();
params.put("Token", token);
params.put("RestaurantID", restaurantId);
String url = ApiManager.headerUrl + ApiManager.menuItemsUrl;
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.POST,
url, new JSONObject(params),
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONObject joResponse = response.getJSONObject("Response");
JSONArray jaMainMenu = joResponse.getJSONArray("MainMenu");
JSONArray jaMenuItemImages = joResponse.getJSONArray("MenuItemImages");
JSONArray jaLinkedMenuItems = joResponse.getJSONArray("LinkedMenuItems");
for (int i = 0; i < jaLinkedMenuItems.length(); i++) {
String menuItemCategoryID1 = jaLinkedMenuItems.getJSONObject(i).getString("MenuItemCategoryID");
if (menuItemCategoryID.equals(menuItemCategoryID1)) {
String menuItemID1 = jaLinkedMenuItems.getJSONObject(i).getString("MenuItemID");
for (int j = 0; j < jaMainMenu.length(); j++) {
String deleted = jaMainMenu.getJSONObject(j).getString("Deleted");
String description = jaMainMenu.getJSONObject(j).getString("Description");
String ingredients = jaMainMenu.getJSONObject(j).getString("Ingredients");
String inventory = jaMainMenu.getJSONObject(j).getString("Inventory");
String menuItemID = jaMainMenu.getJSONObject(j).getString("MenuItemID");
String name = jaMainMenu.getJSONObject(j).getString("Name");
String paused = jaMainMenu.getJSONObject(j).getString("Paused");
String price = jaMainMenu.getJSONObject(j).getString("Price");
String rating = jaMainMenu.getJSONObject(j).getString("Rating");
String restaurantID = jaMainMenu.getJSONObject(j).getString("RestaurantID");
String servedEnd = jaMainMenu.getJSONObject(j).getString("ServedEnd");
String servedStart = jaMainMenu.getJSONObject(j).getString("ServedStart");
String imageURL = jaMenuItemImages.getJSONObject(j).getString("ImageURL");
if (menuItemID1.equals(menuItemID)) {
ModelMenu cModels = new ModelMenu("" + deleted,
"" + description,
"" + ingredients,
"" + inventory,
"" + menuItemID,
"" + name,
"" + paused,
"$" + price,
"" + rating,
"" + restaurantID,
"" + servedEnd,
"" + servedStart,
"" + imageURL);
menuList.add(cModels);
}
}
mAdapter = new AdapterMenu(menuList, getActivity().getApplicationContext(), RestaurantFragment.this);
recyclerView.setAdapter(mAdapter);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
try {
if (error.getMessage().toLowerCase().contains("no address associated with hostname")) {
} else {
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
Volley.newRequestQueue(getActivity()).add(jsonObjReq);
}
}
AdapterMenu.java
public class AdapterMenu extends RecyclerView.Adapter<AdapterMenu.MyHolder> {
List<ModelMenu> menuList;
Context context;
Fragment fragment;
public AdapterMenu(List<ModelMenu> menuList, Context context, Fragment fragment) {
this.menuList = menuList;
this.context = context;
this.fragment = fragment;
}
#NonNull
#Override
public MyHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(context).inflate(R.layout.row_menus, viewGroup, false);
return new MyHolder(view);
}
#Override
public void onBindViewHolder(#NonNull final MyHolder myHolder, int i) {
final String title = menuList.get(i).getName();
final String description = menuList.get(i).getDescription();
final String price = menuList.get(i).getPrice();
final String image = menuList.get(i).getImage();
final String ingredients = menuList.get(i).getIngredients();
final String restaurantID = menuList.get(i).getRestaurantID();
final String menuItemID = menuList.get(i).getMenuItemID();
String notServing;
if (menuList.get(i).getServedStart().equals("null") && menuList.get(i).getServedEnd().equals("null")) {
notServing = "";
myHolder.itemView.setBackgroundColor(context.getResources().getColor(R.color.colorWhite));
} else {
String startTime = Utils.timeTo12hr(menuList.get(i).getServedStart());
String endTime = Utils.timeTo12hr(menuList.get(i).getServedEnd());
notServing = "Only Serving between " + startTime + " - " + endTime;
myHolder.itemView.setBackgroundColor(context.getResources().getColor(R.color.colorGray1));
}
myHolder.titleTv.setText(title);
myHolder.descriptionTv.setText(description);
myHolder.priceTv.setText(price);
myHolder.notServingTv.setText(notServing);
myHolder.addHintTv.setText("Add " + title + " To Order");
myHolder.optionsTv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (myHolder.addItemLayout.getVisibility() == View.VISIBLE) {
myHolder.addItemLayout.setVisibility(View.GONE);
myHolder.optionsTv.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_down_black, 0);
} else {
myHolder.addItemLayout.setVisibility(View.VISIBLE);
myHolder.optionsTv.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_up_black, 0);
}
}
});
myHolder.addItemBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SharedPreferences sp = context.getSharedPreferences("OderSP", Context.MODE_PRIVATE);
int count = sp.getInt("itemCount", 0);
SharedPreferences.Editor editor = sp.edit();
editor.putInt("itemCount", count + 1);
editor.apply();
onAddField(context, myHolder, title, price);
}
});
myHolder.infoBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(context, MenuDetailActivity.class);
intent.putExtra("title", title);
intent.putExtra("description", description);
intent.putExtra("image", image);
intent.putExtra("ingredients", ingredients);
intent.putExtra("restaurantID", restaurantID);
intent.putExtra("menuItemID", menuItemID);
intent.putExtra("image", image);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
try {
final Bitmap b = BitmapFactory.decodeFile(context.getExternalCacheDir() + "/TopServeImages" + "/" + image);
if (b == null) {
ImageDownloader.execute(new Runnable() {
#Override
public void run() {
new ImageDownloader().awsImageDownload(myHolder, image);
}
});
} else {
myHolder.iconIv.setImageBitmap(b);
}
} catch (Exception e) {
ImageDownloader.execute(new Runnable() {
#Override
public void run() {
new ImageDownloader().awsImageDownload(myHolder, image);
}
});
}
}
private int itemsCount = 0;
private void onAddField(final Context context, MyHolder myHolder, final String title, String price) {
final LinearLayout parentLinearLayout = myHolder.itemView.findViewById(R.id.menu_roLl);
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View rowView = inflater.inflate(R.layout.row_additeminfo, null);
parentLinearLayout.addView(rowView, parentLinearLayout.getChildCount() - 1);
final TextView titleTv = rowView.findViewById(R.id.orderInfoTitleTv);
final TextView priceTv = rowView.findViewById(R.id.orderInfoPrice);
final ImageButton removeBtn = rowView.findViewById(R.id.orderInfoRemoveBtn);
itemsCount++;
EasyDB easyDB = EasyDB.init(context, "ITEMS_DB")
.setTableName("ITEMS_TABLE")
.addColumn(new Column("Item_Id", new String[]{"text", "unique"}))
.addColumn(new Column("Item_Name", new String[]{"text", "not null"}))
.addColumn(new Column("Item_Price", new String[]{"text", "not null"}))
.doneTableColumn();
easyDB.addData("Item_Id", title + (parentLinearLayout.getChildCount() - 1))
.addData("Item_Name", title)
.addData("Item_Price", price)
.doneDataAdding();
titleTv.setText("Order: " + itemsCount + " " + title);
priceTv.setText(price);
SharedPreferences sp = context.getSharedPreferences("OderSP", Context.MODE_PRIVATE);
itemsCount = sp.getInt("itemCount", 0);
SharedPreferences.Editor editor = sp.edit();
editor.putInt("itemCount", itemsCount);
editor.apply();
removeBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onDelete(parentLinearLayout, view, title);
}
});
}
private void onDelete(final LinearLayout parentLinearLayout, final View v, final String title) {
AlertDialog.Builder builder = new AlertDialog.Builder(v.getRootView().getContext());
builder.setTitle("Remove this item?");
builder.setMessage(title);
builder.setPositiveButton("Remove", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
parentLinearLayout.removeView((View) v.getParent());
itemsCount--;
SharedPreferences sp = context.getSharedPreferences("OderSP", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.putInt("itemCount", itemsCount);
editor.apply();
EasyDB easyDB = EasyDB.init(context, "ITEMS_DB")
.setTableName("ITEMS_TABLE")
.addColumn(new Column("Item_Id", new String[]{"text", "unique"}))
.addColumn(new Column("Item_Name", new String[]{"text", "not null"}))
.addColumn(new Column("Item_Price", new String[]{"text", "not null"}))
.doneTableColumn();
easyDB.deleteRow("Item_Id", "" + title + (parentLinearLayout.getChildCount()));
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
}
});
builder.create().show();
}
#Override
public int getItemCount() {
return menuList.size();
}
class MyHolder extends RecyclerView.ViewHolder {
TextView titleTv, priceTv, descriptionTv, notServingTv, addHintTv, optionsTv, orderInfoTitleTv, orderInfoPrice;
ImageButton infoBtn, orderInfoRemoveBtn;
ImageView iconIv;
Button addItemBtn;
LinearLayout addItemLayout;
RelativeLayout orderInfoLayout;
MyHolder(#NonNull View itemView) {
super(itemView);
iconIv = itemView.findViewById(R.id.iconIv);
titleTv = itemView.findViewById(R.id.titleTv);
priceTv = itemView.findViewById(R.id.priceTv);
descriptionTv = itemView.findViewById(R.id.descriptionTv);
notServingTv = itemView.findViewById(R.id.notServingTv);
addHintTv = itemView.findViewById(R.id.addHintTv);
optionsTv = itemView.findViewById(R.id.optionsTv);
orderInfoTitleTv = itemView.findViewById(R.id.orderInfoTitleTv);
orderInfoPrice = itemView.findViewById(R.id.orderInfoPrice);
infoBtn = itemView.findViewById(R.id.infoBtn);
orderInfoRemoveBtn = itemView.findViewById(R.id.orderInfoRemoveBtn);
addItemBtn = itemView.findViewById(R.id.addItemBtn);
addItemLayout = itemView.findViewById(R.id.addItemLayout);
orderInfoLayout = itemView.findViewById(R.id.orderInfoLayout);
}
}
}

Here is how I fixed the issue:
First, understand the problem.
In the first activity where you fetch the restaurant list, that is fine.
When the restaurant is clicked, you pass the restaurant id to the RestaurantDetailActivity and do an API request.
In the API request you pass the restaurant id and get the response. The response contains a lost of all the categories of that restaurant and also the list of all the dishes provided by the restaurant in all the categories. This is very important.
At this stage you take only the list of categories in the response and start creating a fragment for each category. You pass the category id to each fragment.
Then each fragment does an API request to the the same API which was called at the activity level (point number 3 above). Each fragment does the same request independently and extracts only the list of menu items that belong to that category. That is a waste of resources.
When a fragment goes out of view , it is destroyed and then recreated when user swipes back to the tab. Every time user comes to a fragment, it loads data again. This repeated loading of data was causing the device to go unresponsive.
Now here is what I did. At step 3, when a string request is done for a particular restaurant and all the menu items are received in response. I create a separate List of menu items for each category at this stage and then pass the list to each fragment. Now each fragment has to just display the list it has received from the activity. Each fragment is not responsible for doing its own string request and parsing it to creating its own list of items. Rather it just received the list from activity and displays it. In this was only one API request is done at activity level. No matter how many time the user switches tabs, there is no extra API request.
public class ModelMenu implements Serializable {
private String deleted, description, ingredients, inventory, menuItemID, name, paused, price, rating, restaurantID, servedEnd, servedStart, image;
public ModelMenu() {
}
public ModelMenu(String name, String price) {
this.name = name;
this.price = price;
}
public ModelMenu(String deleted, String description, String ingredients, String inventory, String menuItemID, String name, String paused, String price, String rating, String restaurantID, String servedEnd, String servedStart, String image) {
this.deleted = deleted;
this.description = description;
this.ingredients = ingredients;
this.inventory = inventory;
this.menuItemID = menuItemID;
this.name = name;
this.paused = paused;
this.price = price;
this.rating = rating;
this.restaurantID = restaurantID;
this.servedEnd = servedEnd;
this.servedStart = servedStart;
this.image = image;
}
public String getDeleted() {
return deleted;
}
public void setDeleted(String deleted) {
this.deleted = deleted;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getIngredients() {
return ingredients;
}
public void setIngredients(String ingredients) {
this.ingredients = ingredients;
}
public String getInventory() {
return inventory;
}
public void setInventory(String inventory) {
this.inventory = inventory;
}
public String getMenuItemID() {
return menuItemID;
}
public void setMenuItemID(String menuItemID) {
this.menuItemID = menuItemID;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPaused() {
return paused;
}
public void setPaused(String paused) {
this.paused = paused;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getRating() {
return rating;
}
public void setRating(String rating) {
this.rating = rating;
}
public String getRestaurantID() {
return restaurantID;
}
public void setRestaurantID(String restaurantID) {
this.restaurantID = restaurantID;
}
public String getServedEnd() {
return servedEnd;
}
public void setServedEnd(String servedEnd) {
this.servedEnd = servedEnd;
}
public String getServedStart() {
return servedStart;
}
public void setServedStart(String servedStart) {
this.servedStart = servedStart;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
}
public class RestaurantFragment extends Fragment {
private String title;
private int page;
private String restaurantId;
private String menuItemCategoryID;
private AdapterMenu mAdapter;
private List<ModelMenu> menuList;
TextView orderTimeTv, changeTimeTv, tenPercentTv, fifteenPercentTv, twentyPercentTv, customTipTv, totalTipTv, subTotalTv, taxTotalTv, totalTv, pickedTimeTv, pickedDateTv, todayTv, cancelTv, itemCountTv;
ImageView fabCartIv;
RecyclerView recyclerView;
public RestaurantFragment() {
// Required empty public constructor
}
// newInstance constructor for creating fragment with arguments
/*public static RestaurantFragment newInstance(int page, String title, String restID, String menuItemCategoryID) {
RestaurantFragment fragmentFirst = new RestaurantFragment();
Bundle args = new Bundle();
args.putInt("someInt", page);
args.putString("someTitle", title);
args.putString("restId", restID);
args.putString("menuItemCategoryID", menuItemCategoryID);
fragmentFirst.setArguments(args);
return fragmentFirst;
}*/
public static RestaurantFragment newInstance(int page, String title, String restID, String menuItemCategoryID, List<ModelMenu> menuList) {
RestaurantFragment fragmentFirst = new RestaurantFragment();
Bundle args = new Bundle();
args.putInt("someInt", page);
args.putString("someTitle", title);
args.putString("restId", restID);
args.putString("menuItemCategoryID", menuItemCategoryID);
args.putSerializable("menuList", (Serializable) menuList);
fragmentFirst.setArguments(args);
return fragmentFirst;
}
// Store instance variables based on arguments passed
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
page = getArguments().getInt("someInt", 0);
title = getArguments().getString("someTitle");
restaurantId = getArguments().getString("restId");
menuItemCategoryID = getArguments().getString("menuItemCategoryID");
menuList = (List<ModelMenu>) getArguments().getSerializable("menuList");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_restaurant, container, false);
recyclerView = view.findViewById(R.id.menuRecyclerView);
itemCountTv = view.findViewById(R.id.itemCountTv);
fabCartIv = view.findViewById(R.id.fabCartIv);
/*if (title.equals("Appetizers")) {
loadDataAppetizers();
} else if (title.equals("Breakfast")) {
loadBreakfast();
} else if (title.equals("Noodle")) {
loadNoodle();
}*/
loadMenuItems();
fabCartIv.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
showCartDialog();
}
});
count();
return view;
}
private void loadMenuItems() {
//recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity().getApplicationContext()));
//Log.i("mytag", "list received with size: " + menuList.size() + ", in tab: " + title);
mAdapter = new AdapterMenu(menuList, getActivity().getApplicationContext(), RestaurantFragment.this);
recyclerView.setAdapter(mAdapter);
/*String token = "auth" + System.currentTimeMillis();
final ProgressDialog progressDialog = new ProgressDialog(getActivity());
//show progress dialog
progressDialog.setMessage("Getting Menu Items...");
progressDialog.show();*/
/*Map<String, String> params = new HashMap<>();
params.put("Token", token);
params.put("RestaurantID", restaurantId);
Log.d("TheToken", Utils.getToken() + "" + Utils.getEmail());
String url = ApiManager.headerUrl + ApiManager.menuItemsUrl;
JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.POST,
url, new JSONObject(params),
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
//progressDialog.dismiss();
Log.d("TheResponse", response.toString());
try {
JSONObject joResponse = response.getJSONObject("Response");
JSONArray jaMainMenu = joResponse.getJSONArray("MainMenu");
JSONArray jaMenuItemImages = joResponse.getJSONArray("MenuItemImages");
JSONArray jaMenuCategories = joResponse.getJSONArray("MenuCategories");
JSONArray jaLinkedMenuItems = joResponse.getJSONArray("LinkedMenuItems");
JSONArray jaMenuSidesTitles = joResponse.getJSONArray("MenuSidesTitles");
JSONArray jaMenuSidesLinks = joResponse.getJSONArray("MenuSidesLinks");
JSONArray jaMenuSides = joResponse.getJSONArray("MenuSides");
*//*for (int j = 0; j < jaMenuCategories.length(); j++) {
String menuItemCategoryID = jaMainMenu.getJSONObject(j).getString("MenuItemCategoryID");
}*//*
for (int i = 0; i < jaLinkedMenuItems.length(); i++) {
String menuItemCategoryID1 = jaLinkedMenuItems.getJSONObject(i).getString("MenuItemCategoryID");
if (menuItemCategoryID.equals(menuItemCategoryID1)) {
String menuItemID1 = jaLinkedMenuItems.getJSONObject(i).getString("MenuItemID");
for (int j = 0; j < jaMainMenu.length(); j++) {
String deleted = jaMainMenu.getJSONObject(j).getString("Deleted");
String description = jaMainMenu.getJSONObject(j).getString("Description");
String ingredients = jaMainMenu.getJSONObject(j).getString("Ingredients");
String inventory = jaMainMenu.getJSONObject(j).getString("Inventory");
String menuItemID = jaMainMenu.getJSONObject(j).getString("MenuItemID");
String name = jaMainMenu.getJSONObject(j).getString("Name");
String paused = jaMainMenu.getJSONObject(j).getString("Paused");
String price = jaMainMenu.getJSONObject(j).getString("Price");
String rating = jaMainMenu.getJSONObject(j).getString("Rating");
String restaurantID = jaMainMenu.getJSONObject(j).getString("RestaurantID");
String servedEnd = jaMainMenu.getJSONObject(j).getString("ServedEnd");
String servedStart = jaMainMenu.getJSONObject(j).getString("ServedStart");
String imageURL = jaMenuItemImages.getJSONObject(j).getString("ImageURL");
if (menuItemID1.equals(menuItemID)) {
ModelMenu cModels = new ModelMenu("" + deleted,
"" + description,
"" + ingredients,
"" + inventory,
"" + menuItemID,
"" + name,
"" + paused,
"$" + price,
"" + rating,
"" + restaurantID,
"" + servedEnd,
"" + servedStart,
"" + imageURL);
menuList.add(cModels);
}
}
//adapter to be set to recyclerview
mAdapter = new AdapterMenu(menuList, getActivity().getApplicationContext(), RestaurantFragment.this);
recyclerView.setAdapter(mAdapter);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
//progressDialog.dismiss();
try {
if (error.getMessage().toLowerCase().contains("no address associated with hostname")) {
} else {
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
Volley.newRequestQueue(getActivity()).add(jsonObjReq);*/
}
private int tipPercentage = 10;
private String date = "";
//used to pass lists in confirm order
private ArrayList idList = new ArrayList();
private ArrayList nameList = new ArrayList();
private ArrayList priceList = new ArrayList();
int ids = 0;
List<ModelMenu> menuList1;
MyAdapters myAdapters;
#SuppressLint("NewApi")
private void showCartDialog() {
View view = LayoutInflater.from(getActivity()).inflate(R.layout.dialog_cart, null);
RecyclerView recyclerView = view.findViewById(R.id.menusLayout);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
menuList1 = new ArrayList<>();
final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(view);
builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
#Override
public void onCancel(DialogInterface dialogInterface) {
tipPercentage = 10;
totalPriceAddRemove = 0.0;
idList.clear();
nameList.clear();
priceList.clear();
ids = 0;
}
});
builder.create().show();
orderTimeTv = view.findViewById(R.id.orderTimeTv);
changeTimeTv = view.findViewById(R.id.changeTimeTv);
tenPercentTv = view.findViewById(R.id.tenPercentTv);
fifteenPercentTv = view.findViewById(R.id.fifteenPercentTv);
twentyPercentTv = view.findViewById(R.id.twentyPercentTv);
customTipTv = view.findViewById(R.id.customTipTv);
totalTipTv = view.findViewById(R.id.totalTipTv);
subTotalTv = view.findViewById(R.id.subTotalTv);
taxTotalTv = view.findViewById(R.id.taxTotalTv);
totalTv = view.findViewById(R.id.totalTv);
pickedTimeTv = view.findViewById(R.id.pickedTimeTv);
pickedDateTv = view.findViewById(R.id.pickedDateTv);
todayTv = view.findViewById(R.id.todayTv);
cancelTv = view.findViewById(R.id.cancelTv);
final Button checkoutBtn = view.findViewById(R.id.checkoutBtn);
Button doneDTBtn = view.findViewById(R.id.doneDTBtn);
final TimePicker timePicker = view.findViewById(R.id.timePicker);
HorizontalCalendar hcCalendar = view.findViewById(R.id.hcCalendar);
final LinearLayout dateTimePickLayout = view.findViewById(R.id.dateTimePickLayout);
final RelativeLayout pricesLayout = view.findViewById(R.id.pricesLayout);
dateTimePickLayout.setVisibility(View.GONE);
pricesLayout.setVisibility(View.VISIBLE);
EasyDB easyDB = EasyDB.init(getActivity(), "ITEMS_DB") // "TEST" is the name of the DATABASE
.setTableName("ITEMS_TABLE") // You can ignore this line if you want
.addColumn(new Column("Item_Id", "text", "unique"))
.addColumn(new Column("Item_Name", "text", "not null"))
.addColumn(new Column("Item_Price", "text", "not null"))
.doneTableColumn();
Cursor res = easyDB.getAllData();
while (res.moveToNext()) {
String id = res.getString(1);
String name = res.getString(2);
String price = res.getString(3);
ModelMenu modelMenu = new ModelMenu("" + name, "" + price);
menuList1.add(modelMenu);
idList.add(ids);
nameList.add(name);
priceList.add(price);
ids++;
}
onAddField(getActivity());
myAdapters = new MyAdapters(getActivity(), menuList1);
recyclerView.setAdapter(myAdapters);
timePicker.setIs24HourView(true);
Calendar calendar = Calendar.getInstance();
final int hours = calendar.get(Calendar.HOUR_OF_DAY);
final int minute = calendar.get(Calendar.MINUTE);
final int year = calendar.get(Calendar.YEAR);
final int month = calendar.get(Calendar.MONTH) + 1;
final int day = calendar.get(Calendar.DAY_OF_MONTH);
date = day + "/" + month + "/" + year;
pickedTimeTv.setText(hours + ":" + minute);
pickedDateTv.setText(day + "/" + month + "/" + year);
timePicker.setHour(hours);
timePicker.setMinute(minute);
timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
#Override
public void onTimeChanged(TimePicker timePicker, int hour, int minute) {
pickedTimeTv.setText(hour + ":" + minute);
}
});
}

Have you tried overriding onStop() in your Activities?
onStop() is called when your app is no longer visible to the user (i.e. pressing Home). You will next receive either onRestart(), onDestroy(), or nothing. This may explain your inconsistent behaviour.
You will likely need to take control and stop any updates to UI elements especially here, and then preserve the state of the UI as the user left it with onSaveInstanceState()
https://developer.android.com/topic/libraries/architecture/saving-states

Passing Activity context to Class file

I made two classes(DataBase, and addItem to database class) and one activiy. I dont know how to pass Activity class into method. AndroidStudio throws error.
I tried to use getApplicationContext(), but didnt work. Here is code:
DataBase file
public DataBase(Context context) {
super(context, DATABASE_NAME, null, TABLE_VERSION); }
DodajNadgranieClass (fragment) file
btZapisz.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String radiobutton = "", bruttoValue ="", data, tytul;
SharedPreferences pref = getSharedPreferences("prefs", MODE_PRIVATE);
data = edPodajDate.getText().toString();
tytul = edPodajTytul.getText().toString();
if (edPodajDate.getText().toString().isEmpty() || edPodajTytul.getText().toString().isEmpty() || radioGroup.getCheckedRadioButtonId() == -1) {
Toast.makeText(DodajNadgranieActivity.this, "Musisz podać wszystkie dane", Toast.LENGTH_SHORT).show();
} else {
if (rbOperetka.isChecked()) {
radiobutton = "1";
bruttoValue = pref.getString("operetka", "");
} else if (rbMusical.isChecked()) {
radiobutton = "2";
bruttoValue = pref.getString("musical", "");
} else if (rbKoncert.isChecked()) {
radiobutton = "3";
bruttoValue = pref.getString("koncert", "");
} else if (rbBajka.isChecked()) {
radiobutton = "4";
bruttoValue = pref.getString("bajka", "");
} else if (rbOpera.isChecked()) {
radiobutton = "5";
bruttoValue = pref.getString("opera", "");
} else if (rbInne.isChecked()) {
radiobutton = "6";
bruttoValue = pref.getString("inne", "");
}
ObliczPodatki obliczPodatki = new ObliczPodatki();
obliczPodatki.obliczPodatki(bruttoValue, data, tytul, radiobutton);
Toast.makeText(DodajNadgranieActivity.this, "DODANO", Toast.LENGTH_SHORT).show();
radioGroup.clearCheck();
edPodajTytul.setText(null);
edPodajDate.setText(null);
and Activity file
public class ObliczPodatki extends Application {
public void obliczPodatki (String brutto, String data, String tytul, String radiobutton) {
kwota_brutto = Double.parseDouble(brutto);
kwota_netto = kwota_brutto * KWOTA_NETTO;
kwota_ubezpieczenie_emerytalne = kwota_brutto * UBEZPIECZENIE_EMERYTALNE;
kwota_ubezpieczenie_rentowe = kwota_brutto * UBEZPIECZENIE_RENTOWE;
kwota_ubezpieczenie_zdrowotne = kwota_brutto * UBEZPIECZENIE_ZDROWOTNE;
kwota_ubezpieczenie_chorobowe = kwota_brutto * UBEZPIECZENIE_CHOROBOWE;
kwota_zaliczka_pit = kwota_brutto * ZALICZKA_PIT;
sBrutto = "" + kwota_brutto;
sNetto = "" + kwota_netto;
sEmerytalne = "" + kwota_ubezpieczenie_emerytalne;
sRentowe = "" + kwota_ubezpieczenie_rentowe;
sZdrowotne = "" + kwota_ubezpieczenie_zdrowotne;
sChorobowe = "" + kwota_ubezpieczenie_chorobowe;
sPit = "" + kwota_zaliczka_pit;
DataBase myDb = new DataBase(this);
myDb.addNewNadgranie(data, tytul, radiobutton, sBrutto, sNetto, sEmerytalne, sRentowe, sZdrowotne, sChorobowe, sPit);
}
}

you are using Application and not Activity class . please change it to this :
public class ObliczPodatki extends AppCompatActivity

You could change the function of obliczPodatki to :
public void obliczPodatki (Activity activity, String brutto, String data, String tytul, String radiobutton) {
Call it using :
obliczPodatki.obliczPodatki((DodajNadgranieActivity)v.getContext(),bruttoValue, data, tytul, radiobutton);

Update method in Android Studio returning java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0

I have an app that uses a foreign key when updating a table. I want to be able to put their email down instead of using their number.
Here is the Database methods:
private int getIdFromName(String email) {
SQLiteDatabase db = this.getWritableDatabase();
ArrayList<Integer> refs = new ArrayList<>();
Cursor cursor;
cursor = db.rawQuery("select " + REFEREE_EMAIL_COL + " from " +
REF_TABLE + " where " + REFEREE_EMAIL_COL + "='" + email + "'", null);
while (cursor.moveToNext()){
refs.add(cursor.getInt(0));
}
return refs.get(0);
}
public boolean updateRef(String email)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
int ref_id = getIdFromName(email);
values.put(REFEREE_ID_COL, ref_id);
db.insert(MATCH_TABLE, null, values);
return true;
}
Here is where I call it:
public class UpdateMatchActivity extends AppCompatActivity {
private static final String TAG = "EditDataActivity";
private Button btnSave,btnDelete;
private EditText homeTeamEdit, awayTeamEdit, typeOfMatchEdit, redCardsEdit, bookingsEdit, groundEdit, refEdit, dateEdit, timeEdit,
awayScoreEdit, homeScoreEdit;
DBHandler mDatabaseHelper;
private String homeTeam, awayTeam, homeScore, awayScore;
private String typeOfMatch;
private String ref;
private String redCards, bookings;
private String date, time;
private String ground;
private int selectedID;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_update_match);
btnSave = (Button) findViewById(R.id.UpdateMatchButton);
homeTeamEdit = (EditText) findViewById(R.id.HomeTeamUpdate);
homeScoreEdit = (EditText) findViewById(R.id.updateHomeScore);
awayTeamEdit = (EditText) findViewById(R.id.AwayTeamUpdate);
awayScoreEdit = (EditText) findViewById(R.id.updateAwayScore);
typeOfMatchEdit = (EditText) findViewById(R.id.updateTypeOfMatch);
refEdit = (EditText) findViewById(R.id.updateRef);
groundEdit = (EditText) findViewById(R.id.updateGround);
refEdit = (EditText) findViewById(R.id.updateRef);
ref = refEdit.getText().toString();
mDatabaseHelper = new DBHandler(this);
//get the intent extra from the ListDataActivity
Intent receivedIntent = getIntent();
//now get the itemID we passed as an extra
selectedID = receivedIntent.getIntExtra("MatchId", -1); //NOTE: -1 is just the default value
//now get the name we passed as an extra
homeTeam = receivedIntent.getStringExtra("homeTeam");
homeScore = receivedIntent.getStringExtra("homeScore");
awayTeam = receivedIntent.getStringExtra("awayTeam");
awayScore = receivedIntent.getStringExtra("awayScore");
ground = receivedIntent.getStringExtra("ground");
typeOfMatch = receivedIntent.getStringExtra("typeOfMatch");
//set the text to show the current selected name
homeTeamEdit.setText(homeTeam);
awayTeamEdit.setText(awayTeam);
typeOfMatchEdit.setText(typeOfMatch);
groundEdit.setText(ground);
homeScoreEdit.setText(homeScore);
awayScoreEdit.setText(awayScore);
btnSave.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String item = refEdit.getText().toString();
if(!mDatabaseHelper.checkIfRefExists(ref)) {
mDatabaseHelper.updateRef(ref);
toastMessage("Ref Updated");
}
else
{
toastMessage("No ref with that email");
}
}
});
}
/**
* customizable toast
* #param message
*/
private void toastMessage(String message){
Toast.makeText(this,message, Toast.LENGTH_SHORT).show();
}
}
I tried using the getIdFromName method when creating for the first time and it works but when I try update it, it gives me "java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)"
Totally lost here so any guidance would be appreciated.

Passing Data between activities Forces Close

I am working on a simple Grading app project with 3 activities, the first one is storing some data in a database and i am replicating that data in both the first activity and the third activity.
The second activity is doing an average calculation and showing the results on that same page, but i want that result to also be shown on the third page. I tried using intents but when i click the button to go to the third page it forces close. What am i doing wrong.
I am trying to show this results in a textview
This is the Second Activity code:
public class AverageActivity extends AppCompatActivity {
EditText editmanner, editinstances, editshortstance, editstrikes, editboxingskills, editknocks, editkicks, editResults;
Button btnResults, btnnewresults;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.average_page);
editmanner = (EditText) findViewById(R.id.editText8);
editinstances = (EditText) findViewById(R.id.editText9);
editshortstance = (EditText) findViewById(R.id.editText10);
editstrikes = (EditText) findViewById(R.id.editText11);
editboxingskills = (EditText) findViewById(R.id.editText12);
editknocks = (EditText) findViewById(R.id.editText13);
editkicks = (EditText) findViewById(R.id.editText14);
editResults = (EditText) findViewById(R.id.editText15);
btnResults = (Button) findViewById(R.id.button10);
btnnewresults = (Button) findViewById(R.id.botonresultnuevo);
btnResults.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int first;
if (editmanner.getText().toString().equals("")) {
first = 0;
} else {
first = Integer.valueOf(editmanner.getText().toString());
}
int second;
if (editinstances.getText().toString().equals("")) {
second = 0;
} else {
second = Integer.valueOf(editinstances.getText().toString());
}
int third;
if (editshortstance.getText().toString().equals("")) {
third = 0;
} else {
third = Integer.valueOf(editshortstance.getText().toString());
}
int fourth;
if (editstrikes.getText().toString().equals("")) {
fourth = 0;
} else {
fourth = Integer.valueOf(editstrikes.getText().toString());
}
int fifth;
if (editboxingskills.getText().toString().equals("")) {
fifth = 0;
} else {
fifth = Integer.valueOf(editboxingskills.getText().toString());
}
int sixth;
if (editknocks.getText().toString().equals("")) {
sixth = 0;
} else {
sixth = Integer.valueOf(editknocks.getText().toString());
}
int seventh;
if (editkicks.getText().toString().equals("")) {
seventh = 0;
} else {
seventh = Integer.valueOf(editkicks.getText().toString());
}
int results;
first = Integer.parseInt(editmanner.getText().toString());
second = Integer.parseInt(editinstances.getText().toString());
third = Integer.parseInt(editshortstance.getText().toString());
fourth = Integer.parseInt(editstrikes.getText().toString());
fifth = Integer.parseInt(editboxingskills.getText().toString());
sixth = Integer.parseInt(editknocks.getText().toString());
seventh = Integer.parseInt(editkicks.getText().toString());
results = (first + second + third + fourth + fifth + sixth + seventh) / 7;
editResults.setText(String.valueOf(results));
}
});
}
public void knowtheresults(View view) {
switch (view.getId()) {
case R.id.botonresultnuevo:
Intent miintent = new Intent(AverageActivity.this, ResultActivity.class);
Bundle miBundle = new Bundle();
miBundle.putString("nombre", editResults.getText().toString());
miintent.putExtras(miBundle);
startActivity(miintent);
break;
}
String button_text;
button_text = ((Button) view).getText().toString();
if (button_text.equals("Summary")) {
Intent intent = new Intent(this, ResultActivity.class);
startActivity(intent);
}
}
}
And This is the Third activity code:
public class ResultActivity extends Activity {
TextView texto;
DatabaseHelper mDatabaseHelper;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result_page);
texto = (TextView) findViewById(R.id.editText15);
Bundle mibundle=this.getIntent().getExtras();
if(mibundle!=null){
String dato = mibundle.getString("nombre");
texto.setText(dato);
}
mDatabaseHelper = new DatabaseHelper(this);
displayDatabaseInfo();
}
private void displayDatabaseInfo() {
// To access our database, we instantiate our subclass of SQLiteOpenHelper
// and pass the context, which is the current activity.
DatabaseHelper mDbHelper = new DatabaseHelper(this);
// Create and/or open a database to read from it
SQLiteDatabase db = mDbHelper.getReadableDatabase();
// Perform this raw SQL query "SELECT * FROM pets"
// to get a Cursor that contains all rows from the pets table.
Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_NAME, null);
TextView displayView = findViewById(R.id.textViewR1);
try {
displayView.setText("The Student...\n\n");
displayView.append(COL1 + "--" +
COL2 + "--" +
COL4 +
"\n");
// Figure out the index
int idColumnIndex = cursor.getColumnIndex(COL1);
int nameColumnIndex = cursor.getColumnIndex(COL2);
int rankColumnIndex = cursor.getColumnIndex(COL4);
while (cursor.moveToNext()) {
int currentID = cursor.getInt(idColumnIndex);
String currentName = cursor.getString(nameColumnIndex);
String currenRank = cursor.getString(rankColumnIndex);
displayView.append(currentID + "--" +
currentName + "--" +
currenRank + "\n");
}
} finally {
// Always close the cursor when you're done reading from it. This releases all its
// resources and makes it invalid.
cursor.close();
}
}
public void knowtheresults(View view) {
String button_text;
button_text = ((Button) view).getText().toString();
if (button_text.equals("Start Page")) {
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
} else if (button_text.equals("Back...")) {
Intent intent = new Intent(this, AverageActivity.class);
startActivity(intent);
}
}
}

Remove Bundle from your code and use following code
Intent miintent = new Intent(AverageActivity.this, ResultActivity.class);
miintent.putString("nombre", editResults.getText().toString());
startActivity(miintent);
In you third Activity
String number = getIntent().getStringExtra("nombre");

Retrieve email belonging to username in android

I have to develop a login form android application.Here, i have to enter the username and password. If it is correct, fetch the email belonging to the username and display it in the textview and if the username and password is wrong, display login failed message.
This is my webservice code:
public class Login {
public String authentication(String username,String password) {
String retrievedUserName = "";
String retrievedPassword = "";
String retrievedEmail = "";
String status = "";
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/xcart-432pro","root","");
PreparedStatement statement = con.prepareStatement("SELECT * FROM xcart_customers WHERE login = '"+username+"'");
ResultSet result = statement.executeQuery();
while(result.next()){
retrievedUserName = result.getString("login");
retrievedPassword = result.getString("password");
retrievedEmail = result.getString("email");
}
if(retrievedUserName.equals(username)&&retrievedPassword.equals(password)&&!(retrievedUserName.equals("") && retrievedPassword.equals(""))){
status = "Success";
}
else {
status = "Login fail!!!";
}
}
catch(Exception e){
e.printStackTrace();
}
return status;
}
};
This is my android code:
public class CustomerLogin extends Activity {
private static final String SPF_NAME = "vidslogin";
private static final String USERNAME = "login";
private static final String PASSWORD = "password";
private static final String PREFS_NAME = null;
CheckBox chkRememberMe;
private String login;
String mGrandTotal,total,mTitle;
EditText username,userPassword;
private final String NAMESPACE = "http://xcart.com";
private final String URL = "http://10.0.0.75:8085/XcartLogin/services/Login?wsdl";
private final String SOAP_ACTION = "http://xcart.com/authentication";
private final String METHOD_NAME = "authentication";
private String uName;
/**Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.customer_login);
Bundle b = getIntent().getExtras();
total = b.getString("GrandTotal");
mTitle = b.getString("Title");
TextView grandtotal = (TextView) findViewById(R.id.grand_total);
grandtotal.setText("Welcome ," + mTitle );
chkRememberMe = (CheckBox) findViewById(R.id.rempasswordcheckbox);
username = (EditText) findViewById(R.id.tf_userName);
userPassword = (EditText) findViewById(R.id.tf_password);
SharedPreferences loginPreferences = getSharedPreferences(SPF_NAME, Context.MODE_PRIVATE);
username.setText(loginPreferences.getString(USERNAME, ""));
userPassword.setText(loginPreferences.getString(PASSWORD, ""));
Button login = (Button) findViewById(R.id.btn_login);
login.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
loginAction();
}
});
}
private void loginAction(){
boolean isUserValidated = true;
boolean isPasswordValidated = true;
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
EditText username = (EditText) findViewById(R.id.tf_userName);
String user_Name = username.getText().toString();
EditText userPassword = (EditText) findViewById(R.id.tf_password);
String user_Password = userPassword.getText().toString();
//Pass value for userName variable of the web service
PropertyInfo unameProp =new PropertyInfo();
unameProp.setName("username");//Define the variable name in the web service method
unameProp.setValue(user_Name);//set value for userName variable
unameProp.setType(String.class);//Define the type of the variable
request.addProperty(unameProp);//Pass properties to the variable
//Pass value for Password variable of the web service
PropertyInfo passwordProp =new PropertyInfo();
passwordProp.setName("password");
passwordProp.setValue(user_Password);
passwordProp.setType(String.class);
request.addProperty(passwordProp);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.setOutputSoapObject(request);
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
try{
androidHttpTransport.call(SOAP_ACTION, envelope);
SoapPrimitive response = (SoapPrimitive)envelope.getResponse();
String status = response.toString();
TextView result = (TextView) findViewById(R.id.tv_status);
result.setText(response.toString());
if(status.equals("Success")) {
// ADD to save and read next time
String strUserName = username.getText().toString().trim();
String strPassword = userPassword.getText().toString().trim();
if (null == strUserName || strUserName.length() == 0) {
// showToast("Enter Your Name");
username.setError( "username is required!" );
isUserValidated = false;
}
if (null == strPassword || strPassword.length() == 0) {
// showToast("Enter Your Password");
isPasswordValidated = false;
userPassword.setError( "password is required!" );
}
if (isUserValidated = true && isPasswordValidated == true) {
if (chkRememberMe.isChecked()) {
SharedPreferences loginPreferences = getSharedPreferences(SPF_NAME, Context.MODE_PRIVATE);
loginPreferences.edit().putString(USERNAME, strUserName).putString(PASSWORD, strPassword).commit();
}
else {
SharedPreferences loginPreferences = getSharedPreferences(SPF_NAME, Context.MODE_PRIVATE);
loginPreferences.edit().clear().commit();
}
}
if (isUserValidated && isPasswordValidated) {
Intent intent = new Intent(CustomerLogin.this,PayPalIntegrationActivity.class);
intent.putExtra("GrandTotal", total);
intent.putExtra("Title", mTitle);
intent.putExtra("login",username.getText().toString());
startActivity(intent);
}
}
else {
LayoutInflater inflater = getLayoutInflater();
View layout = inflater.inflate(R.layout.toast_custom_layout,
(ViewGroup) findViewById(R.id.toast_layout_root));
Toast toast = new Toast(getApplicationContext());
toast.setGravity(Gravity.TOP, 0, 30);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();
}
}
catch(Exception e){
}
}
}
If the login is success, it will have to display the email on textview. How can i do that?

You can use asy task to do this,
in doInBackground
Do your login operations. Asyctask makes this operation in another task.
when complated in onPostExecute
show the success message. But you need to use runOnUiThread because you cant reach ui controls from non ui thread.
private class loginTask extends AsyncTask<URL, Integer, int> {
protected Long doInBackground(URL... urls) {
// start login process
return 1;
}
protected void onPostExecute(int result) {
_activity.runOnUiThread(new Runnable() {
#Override
public void run() {
textview.setText("login success");
}
});
}
}

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