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List listing returning object reference [duplicate]

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How do I print my Java object without getting "SomeType#2f92e0f4"?
(13 answers)
Closed 1 year ago.
I'm making an application, where I have a central recyclerview where items that the user will type are listed, below 2 buttons, one for adding items and the other for finishing. The problem I am having is that when the user finishes the task and clicks on finish I want to get all the data that was listed on his screen that is inside a List and store it in firebase, but I am not able to get this data in shape array, it always returns the object reference.
Searching the internet I found how to use the .toString in the array, but it returns me the same thing.
Here is the example of the return I am receiving.
return
the code of my object
public class ListItem {
private float measure;
public ListItem(float measure) {
this.measure = measure;
}
public float getMeasure() {
return measure;
}
public void setMeasure(float measure) {
this.measure = measure;
}
}
the code of my button add
private View.OnClickListener addItem = new View.OnClickListener() {
#Override
public void onClick(View v) {
DialogForm();
mAdapter.notifyItemInserted(listItems.size());
}
};
void DialogForm() {
AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
final View customLayout = getLayoutInflater().inflate(R.layout.layout_dialog, null);
alert.setView(customLayout);
alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
EditText measure = customLayout.findViewById(R.id.edit_measure);
String response = measure.getText().toString();
if (response.isEmpty() || response.equals("0")) {
Toast.makeText(MainActivity.this, "A medida não pode ser vazia",
Toast.LENGTH_SHORT).show();
} else {
listItems.add(new ListItem(Float.parseFloat(response)));
btnFinish.setEnabled(true);
btnFinish.setBackgroundResource(R.drawable.bg_button_enabled);
}
}
});
AlertDialog dialog = alert.create();
dialog.show();
}
the code of my button finish, when I'm listing
private View.OnClickListener finishListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
for (int i=0; i<listItems.size(); i++){
Log.d("teste", listItems.get(i).toString());
}
}
};

toString() will always return the hash of the object if not override as it is an inherited method from java.lang.Object and not specific to your object
If you want toString to return the measure variable then add the following to your ListItem class
#Override
public String toString() {
return Integer.toString(measure);
}
In order to add more entries to the method, just add another + myData but perhaps ensure there is some sort of divider to make it moire readable - such as + " || " + or something
Good luck with the project

RecyclerView radio button won't register only the latest checked item (remember previous too)

I have RecyclerView which has multiple items, those items contain radio buttons, course name (TextView) and hole number (TextView).
What supposes to happen is that when I click the radio button, it should select only that 1, and if there are the previous check it should uncheck it (single selection). Well at the moment It checks only 1 at a time which is ok (so frontend works as it should), but what happens "under the hood"... example:
There are currently 3 items in RecyclerView. I click the third item to be checked, then I click first, and again third. now I click "start game" button, what should happen is that it should take that lastly checked item (in this case the third left lastly selected) and intent its course name and hole number to the next Activity, but instead what happens now is that it intent the first items course name and hole number... Also if I do the same as previous, but instead of clicking first item, I click second, then even tho lastly I clicked that third item, instead intent its course name and hole number, it intents that second items... So it always intents that item which is clicked (at some point) and from those clicked items it checks the first 1 (from top to bottom of a list) and take its intents.
Here is my Adapter where I'm checking which 1 is selected:
public class NewGameCourseAdapter extends RecyclerView.Adapter<NewGameCourseAdapter.NewGameCourseViewHolder> {
private ArrayList<NewGameCourseItem> mCourseList;
private NewGamePlayerAdapter.OnItemsCheckStateListener checkStateListener;
private NewGameCourseAdapter.OnItemClickListener itemClickListener;
public void setOnItemClickListener(NewGameCourseAdapter.OnItemClickListener listener) {
itemClickListener = listener;
}
public interface OnItemClickListener {
void onItemClick(int position);
}
public void setOnItemsCheckStateListener(NewGamePlayerAdapter.OnItemsCheckStateListener checkStateListener) {
this.checkStateListener = checkStateListener;
}
public static class NewGameCourseViewHolder extends RecyclerView.ViewHolder {
public RadioButton mRadioButton;
public NewGameCourseViewHolder(#NonNull View itemView, final NewGameCourseAdapter.OnItemClickListener listener) {
super(itemView);
mRadioButton = itemView.findViewById(R.id.radioButton);
}
}
onBindViewHolder:
#Override
public void onBindViewHolder(#NonNull final NewGameCourseViewHolder holder, final int position) {
final NewGameCourseItem currentItem = mCourseList.get(position);
/** This can prevent some unwanted actions in some cases **/
holder.mRadioButton.setOnCheckedChangeListener(null);
holder.mRadioButton.setChecked(selectedPosition == position);
holder.mRadioButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
notifyItemChanged(selectedPosition);
selectedPosition = holder.getAdapterPosition();
notifyItemChanged(selectedPosition);
if (itemClickListener != null) {
itemClickListener.onItemClick(position);
}
}
});
This is the Activity where I do the intent:
mStartGame = findViewById(R.id.button_start_game);
mStartGame.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
for (int i = 0; i < mCourseList.size(); i++) {
/** If radio button is selected, then intent to ActivityGame **/
if (mCourseList.get(i).getRadioButton() == true) {
Intent intent = new Intent(ActivityNewGame2.this, ActivityGame.class);
/** Also intent selected items course name and hole number **/
intent.putExtra("COURSENAME", mCourseList.get(i).getCourseName());
intent.putExtra("HOLESNM", mCourseList.get(i).getHolesNm());
startActivity(intent);
overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left);
break;
}
}
}
});
Summary: in frontend it looks correct, it selects only that radio button which is lastly clicked and uncheck the previous (as it should), but inside, it won't "forget" the previous selections as it should do...

You are doing something weird, if possible make that simple.
Step 1: Create a method to get the selected item in your adapter class
public NewGameCourseItem getSelectedItem() {
return mCourseList.get(selectedPosition);
}
Step 2: Then modify your on click method like below
mStartGame.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
NewGameCourseItem item = adapter.getSelecteditem();
Intent intent = new Intent(ActivityNewGame2.this, ActivityGame.class);
/** Also intent selected items: course name and hole number **/
intent.putExtra("COURSENAME", item.getCourseName());
intent.putExtra("HOLESNM", item.getHolesNm());
startActivity(intent);
overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left);
}
});
Step 3: Now modify your onCheckedChanged as below
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
notifyItemChanged(selectedPosition);
selectedPosition = holder.getAdapterPosition();
notifyItemChanged(selectedPosition);
}

Create a class variable in adapter
private int selectedPosition = -1; //change -1 to any default position, need to be selected.
Modify the below function in adapter
#Override
public void onBindViewHolder(#NonNull final NewGameCourseViewHolder holder, final int position) {
final NewGameCourseItem currentItem = mCourseList.get(position);
holder.mRadioButton.setChecked(selectedPosition == position);
holder.mRadioButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
if(isChecked) {
int tempSelected = selectedPosition;
selectedPosition = position;
notifyDataSetChanged();
}
}
});
}
Create a new method in adapter as below-
public int getSelectedItemIndex() {
return selectedPosition;
}
I assume adapter is the variable of NewGameCourseAdapter in the Activity class. Modify the button click in the Activity:
mStartGame.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int selectedRecyclerItemPosition = adapter.getSelectedItemIndex();
//Calling intent and pass selected item info
Intent intent = new Intent(ActivityNewGame2.this, ActivityGame.class);
/** Also intent selected items course name and hole number **/
intent.putExtra("COURSENAME", mCourseList.get(selectedRecyclerItemPosition).getCourseName());
intent.putExtra("HOLESNM", mCourseList.get(selectedRecyclerItemPosition).getHolesNm());
startActivity(intent);
overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left);
}
});

Customize intent in share button with splitting string or how to split string and replace odd commas

Description: I want to use share button. With share button user sending a list as a message. In the list each item has Title + Description
The problem: System get all items from a list and put it in the line one after another by using a comma.
I have: TitleItemOne,DescriptionItemOne,TitleItemTwo,DescriptionItemTwo
I need:
TitleItemOne - DescriptionItemOne
TitleItemTwo - DescriptionItemTwo
Or:
Maybe it is easier to replace all ODD comma "," with "-" so it will that style which i am looking for.
That's the code (needed code in Sharebutton method)
/**
* Displays list of list that were entered and stored in the app.
*/
public class CatalogActivity extends AppCompatActivity implements
LoaderManager.LoaderCallbacks<Cursor> {
private static final String TAG = "myLogs";
/** Identifier for the pet data loader */
private static final int LIST_LOADER = 0;
/** Adapter for the ListView */
ListCursorAdapter mCursorAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_catalog);
Log.v(TAG, "Зашли в catalog activity oncreate");
// Setup FAB to open EditorActivity
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(CatalogActivity.this, EditorActivity.class);
startActivity(intent);
}
});
// Find the ListView which will be populated with the list data
ListView listListView = (ListView) findViewById(R.id.list);
// Find and set empty view on the ListView, so that it only shows when the list has 0 items.
View emptyView = findViewById(R.id.empty_view);
listListView.setEmptyView(emptyView);
// Setup an Adapter to create a list item for each row of list data in the Cursor.
// There is no items data yet (until the loader finishes) so pass in null for the Cursor.
mCursorAdapter = new ListCursorAdapter(this, null);
listListView.setAdapter(mCursorAdapter);
// Setup the item click listener
listListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
ShoppingListBdHelper helper = new ShoppingListBdHelper(view.getContext());
if (helper.setCompleted(id)) {
mCursorAdapter.setCompleted(view);
}
}
});
// Kick off the loader
getSupportLoaderManager().initLoader(LIST_LOADER, null, this);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu options from the res/menu/menu_catalog.xml file.
// This adds menu items to the app bar.
getMenuInflater().inflate(R.menu.menu_catalog, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// User clicked on a menu option in the app bar overflow menu
switch (item.getItemId()) {
// Respond to a click on the "Insert dummy data" menu option
case R.id.action_share_button:
shareButton(mCursorAdapter.getCursor());
return true;
// Respond to a click on the "Delete all entries" menu option
case R.id.action_delete_all_entries:
deleteAllItems();
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* Share button
*/
private void shareButton(Cursor cursor) {
Log.v(TAG, "--- WE ARE IN SHARE BUTTON METHOD ---");
List<String> test;
test = new ArrayList<String>();
cursor.moveToFirst();
while(!cursor.isAfterLast()) {
Log.d(TAG, "field: " + cursor.getString(cursor.getColumnIndex(ListContract.ListEntry.COLUMN_ITEM_NAME)));
test.add(cursor.getString(cursor.getColumnIndex(ListContract.ListEntry.COLUMN_ITEM_NAME))); //add the item
test.add(cursor.getString(cursor.getColumnIndex(ListContract.ListEntry.COLUMN_ITEM_DESCRIPTION))); //add the item
cursor.moveToNext();
}
cursor.moveToFirst();
Log.v(TAG, "--- OUR LIST INCLUDES: " + test.toString());
Intent myIntent = new Intent();
myIntent.setAction(Intent.ACTION_SEND);
myIntent.putStringArrayListExtra("test", (ArrayList<String>) test);
myIntent.putExtra(android.content.Intent.EXTRA_TEXT, test.toString());
Log.v(TAG, "--- INTENT EXTRAS ARE: " + myIntent.getExtras());
myIntent.setType("text/plain");
startActivity(Intent.createChooser(myIntent, "Share using"));
}
/**
* Helper method to delete all list in the database.
*/
private void deleteAllItems() {
Log.v(TAG, "Сработал метод удаления всех данных");
long rowsDeleted = getContentResolver().delete(ListContract.ListEntry.CONTENT_URI, null, null);
Log.v("CatalogActivity", rowsDeleted + " rows deleted from list database");
}
#Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
Log.v(TAG, "Начал работать loader cursor");
// Define a projection that specifies the columns from the table we care about.
String[] projection = {
ListContract.ListEntry._ID,
ListContract.ListEntry.COLUMN_ITEM_NAME,
ListContract.ListEntry.COLUMN_ITEM_DESCRIPTION,
ListContract.ListEntry.COLUMN_ITEM_COMPLETED
};
// This loader will execute the ContentProvider's query method on a background thread
return new CursorLoader(this, // Parent activity context
ListContract.ListEntry.CONTENT_URI, // Provider content URI to query
projection, // Columns to include in the resulting Cursor
null, // No selection clause
null, // No selection arguments
null); // Default sort order
}
#Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
// Update {#link ListCursorAdapter} with this new cursor containing updated pet data
mCursorAdapter.swapCursor(data);
Log.v(TAG, "Cursor adapter загрузился");
}
#Override
public void onLoaderReset(Loader<Cursor> loader) {
// Callback called when the data needs to be deleted
mCursorAdapter.swapCursor(null);
}
}

you can format your strings to html or using "\n"
string to html :
you can use Html.fromHtml() to use HTML tag in your string :
Html.fromHtml("<h2>Title</h2><br><p>Description here</p>"));
for using "\n" you can use System.getProperty("line.separator") wich is OS dependent line separator

Change
test.add(cursor.getString(cursor.getColumnIndex(ListContract.ListEntry.COLUMN_ITEM_NAME))); //add the item test.add(cursor.getString(cursor.getColumnIndex(ListContract.ListEntry.COLUMN_ITEM_DESCRIPTION)));
To
test.add(cursor.getString(cursor.getColumnIndex(ListContract.ListEntry.COLUMN_ITEM_NAME)) + "-" + (cursor.getString(cursor.getColumnIndex(ListContract.ListEntry.COLUMN_ITEM_DESCRIPTION)));
Note:
I may not have all the parenthesis correctly closed, but you get the idea

Permanently save intent from other activity (with two values) to listview

I'm trying to save two values from an activity (where the user can put in two different values, one String value and one integer value) in the listview from another activity. In the first activity, it shows a list with a course and the amount of points for that course in one listview, like this:
Course: English
Points: 4
Now, the problem is, everytime I want to put in another value using the add_course_actitivty, it overwrites the previous value. I've looked at different solutions, like with sharedpreferences (Add items to listview from other activity), but this uses only one value and if I try to work with sharedpreferences, it overwrites the other value in the sharedpreferences, but I want users to add multiple courses and corresponding points. Also on restart, it deletes the values in the listview (I read to prevent this you need to store it in sharedpreferences, but this doesn't work the way I need it to be)
KeuzeActivity.class (shows the listview):
public class KeuzeActivity extends AppCompatActivity {
private FloatingActionButton fab_add;
private String student_naam;
private ListView keuze_list;
boolean wantDelete;
private ArrayAdapter adapter;
private String vak;
private int ec;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_keuze);
// setting title
student_naam = getIntent().getStringExtra("student");
setTitle("Keuzevakken en projecten van " + student_naam);
//initialzing elements
fab_add = (FloatingActionButton)findViewById(R.id.fab_add);
keuze_list = (ListView) findViewById(R.id.keuze_list);
//initializing list
final ArrayList<Course> courseItems = new ArrayList<Course>();
adapter = new ArrayAdapter<Course>(this, android.R.layout.simple_list_item_1, courseItems);
keuze_list.setAdapter(adapter);
// checks if intent has required values, put it in listview
if (getIntent().hasExtra("vak") && getIntent().hasExtra("ec")) {
vak = getIntent().getStringExtra("vak");
ec = getIntent().getIntExtra("ec", ec);
courseItems.add(new Course(vak, ec));
adapter.notifyDataSetChanged();
}
// make fab go to other activity
fab_add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(KeuzeActivity.this, add_course_activity.class));
}
});
// long press deletes item
keuze_list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
showDeleteDialog();
if (wantDelete) {
courseItems.remove(position);
adapter.notifyDataSetChanged();
}
return true;
}
});
}
private void showDeleteDialog() {
AlertDialog.Builder infobuilder = new AlertDialog.Builder(this);
infobuilder.setCancelable(false);
infobuilder.setTitle("Vak/project verwijderen");
infobuilder.setMessage("Weet je zeker dat je het vak of project wilt verwijderen?");
final TextView text = new TextView(this);
// action when pressed OK
infobuilder.setPositiveButton("Ja", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
wantDelete = true;
dialog.cancel();
}
});
infobuilder.setNegativeButton("Nee", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
wantDelete = false;
dialog.cancel();
}
});
infobuilder.show();
}
}
add_course_activity.class (let's users input course and points)
public class add_course_activity extends AppCompatActivity {
private EditText course_edit;
private EditText ec_edit;
private Button save_btn;
private String student_name;
private int ec;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_course);
setTitle("Voeg vak of project toe");
final Context context = getApplicationContext();
// initializing elements
course_edit = (EditText) findViewById(R.id.edit_vak);
ec_edit = (EditText) findViewById(R.id.edit_ec);
save_btn = (Button) findViewById(R.id.save_button);
// action on savebutton
save_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (course_edit.getText().toString().trim().length() > 0 && ec_edit.getText().toString().trim().length() > 0 ) {
ec = Integer.parseInt(ec_edit.getText().toString());
Intent goBack = new Intent(add_course_activity.this, KeuzeActivity.class);
goBack.putExtra("vak", course_edit.getText().toString());
goBack.putExtra("ec", ec);
goBack.putExtra("student", PreferenceManager.getDefaultSharedPreferences(context).getString("student_name", student_name));
startActivity(goBack);
}
else {
Toast.makeText(context, "Voer juiste informatie in!", Toast.LENGTH_SHORT).show();
}
}
});
}
}
Course.java class (getters and setters + with toString method)
public class Course {
private String vak;
private int ec;
public Course(String vak, int ec) {
this.vak = vak;
this.ec = ec;
}
public String getVak() {
return vak;
}
public void setVak(String vak) {
this.vak = vak;
}
public int getEc() {
return ec;
}
public void setEc(int ec) {
this.ec = ec;
}
#Override
public String toString() {
return ("Vak: " + vak + "\n" + "Punten: " + ec);
}
}
Note that my code isn't clean or done, but to get further I need to fix this problem.

You have several way to do it. As other replies have suggested you can use an SQLLite database and add data to a course table and retrieve data from it.
If you find Db approach to complicated/heavy
You could also use SharedPreferences what you need to do is figure a way to store a string that represent a list of course. It is not the best way to approach it but it will work.
Lets say you choose to serialize your Course object with "vac-ec"
Then you just store a serialized list of course. Example "vac1-ec1,vac2-ec2"
When you need to add a course you juste grab the previous string split it to list, append the new course to the list and re-serialize the list to a string to encode it.
Other solution could be to use Realm.

You should used SQLiteDatabase and create a table with valid attributes and insert your new values into them

Okay, now things are clearer. As answered by #Dwijraj, when storing what potentially will be a large set of data, for maximum control it is best to use SQLite.
You can read more about the different Saving Data methods here:
https://developer.android.com/training/basics/data-storage/index.html
SharedPreferences are best used to store small amounts of information, like storing the settings of an application. [Mute] for example. Or a highscore in case of a game.
A Database is a better option when it comes to storing large pieces of data that you will potentially manipulate.
Your data structure can be something like this, Courses table containing Unique_ID , Course Name, Course Level, Course summary.
A table for English for example which will contain
Exams, Scores, Duration.
There are a lot of things you can do.

Try by storing the records in SQLite, and get it when you want to show.
By this, You can have a track of all added items. And you can show the items you want.

Resaving object instead of creating a new one in list

Solved - Answer is at end of thread
I'm creating a notes app. And in that app everything is going well so far except that when I'm trying to edit the note (in a recycler view) and I click save, it creates a new one instead of resaving the contents of the existing note. Because I don't have a way to save it again, that being because I'm not sure how to go about it. Here is how I handle saving the note in my activity, CreateNoteActivity.java
// FAB
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// Check to see if at least one field is populated with data
String title = etTitle.getText().toString();
String description = etDescription.getText().toString();
title = title.trim(); // Remove whitespaces at the beginning/end
description = description.trim();
// Get intent extras
Intent intent = getIntent();
String alreadyCreatedTitle = intent.getStringExtra(CreateNoteActivity.EXTRA_TITLE);
String alreadyCreatedDescription = intent.getStringExtra(CreateNoteActivity.EXTRA_DESCRIPTION);
// Check to see if note title is empty, if it is, don't save
if (title == "" || title.isEmpty()) {
Snackbar snackbar = Snackbar.make(view, "Title may not be empty", Snackbar.LENGTH_SHORT);
snackbar.show();
// If the user clicked an already made note and did not change its contents, go back to MainActivity
} else if (title.equals(alreadyCreatedTitle) && description.equals(alreadyCreatedDescription)) {
finish();
CreateNoteActivity.didClick = false;
// The user is editing a note
} else if (didClick) {
// If the title or description is different then resave the note
if (!title.equals(alreadyCreatedTitle) || !description.equals(alreadyCreatedDescription)) {
// TODO: Make it resave the note object
}
} else {
saveNote();
CreateNoteActivity.didClick = false;
}
}
});
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
After that, it comes to my MainActivity.java class where onActivityResult() handles the data and saves a new note, or updates the existing note (not yet implemented)
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 123) {
if (resultCode == Activity.RESULT_OK) {
String passedTitle = data.getStringExtra(CreateNoteActivity.EXTRA_TITLE);
String passedDescription = data.getStringExtra(CreateNoteActivity.EXTRA_DESCRIPTION);
if (CreateNoteActivity.didClick) { // User is saving an existing note
// TODO: Resave the existing note object
// **************************
} else { // User is creating a new note
notes.add(new Note(passedTitle, passedDescription));
}
}
refreshAdapter();
if (resultCode == Activity.RESULT_CANCELED) {
// Do something if it's cancelled. Happens when you click the back button for example
}
}
}
As you can see, i have a variable, "CreateNoteActivity.didClick = false;" of static boolean in this class that I am using to keep track if the user clicked on a note, and it brought them to this activity.
I keep track of that in my adapter class
#Override
public void onClick(View view) {
CreateNoteActivity.didClick = true;
Log.d("TAG", "onClick() called on row: " + getAdapterPosition());
Intent intent = new Intent(context, CreateNoteActivity.class);
intent.putExtra(CreateNoteActivity.EXTRA_TITLE, titleTV.getText().toString());
intent.putExtra(CreateNoteActivity.EXTRA_DESCRIPTION, descriptionTV.getText().toString());
((Activity) context).startActivityForResult(intent, 123);
}
So when the user clicks a note at a specific index, it passes the intent extras to CreateNoteActivity.java so it can retrieve them, and populate the edit text with their info. So now what I am wanting to do is if the user clicks save, it doesn't make a new note, but instead resaves the old note
I really would appreciate anyones help and feedback with solving this problem. Been stuck on it for a couple hours now and I just don't know how to wrap my head around going for this. Thank you very much.
My simple notes class
public class Note {
private String title;
private String description;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Note(String title, String description) {
this.title = title;
this.description = description;
}
public Note() {
// Empty
}
}
Solution
So what I ended up doing was creating a static int and setting it to getAdapterPosition() so that I could always get the position the certain object was at. I then passed it as an intent extra and retrieved it so that I could mess with it. Removed it at that specified index, and set a new one at that index.
if (CreateNoteActivity.didClick) { // User is saving an existing note
note.setTitle(passedTitle);
note.setDescription(passedDescription);
notes.remove(passedID); // Remove note so I can put that same one at the top
notes.add(0, note); // Put note at top of list
CreateNoteActivity.didClick = false;
recyclerView.scrollToPosition(0); // Scroll to top
} else { // User is creating a new note
note.setTitle(passedTitle);
note.setDescription(passedDescription);
notes.add(0, note);
recyclerView.scrollToPosition(0);
}
}

You should also store id of a Note and pass it to be able to edit. You can use its position as the id.
if (CreateNoteActivity.didClick) { // User is saving an existing note
Note anote = notes.getItem(passedNoteId);
anote.setTitle(passedTitle);
anote.setDescription(passedDescription);
} else { // User is creating a new note
notes.add(new Note(passedTitle, passedDescription));
}