Develop Reference

How to exchange the total if the item in holder had remove?

I can remove the item in holder but the price doesn't exchange. i had try to make the data remove but it's non sense too
i had try make the sub been minus but's still it's doesn't work on it i had the for list on the holder to made the price exchange it doesn't help through too
One Fragment.java
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View krnjg =inflater.inflate(R.layout.fragment_keranjang,container,false);
RecyclerView rec = krnjg.findViewById(R.id.rc1);
LinearLayoutManager aw1 =new LinearLayoutManager(getActivity(),LinearLayoutManager.VERTICAL,false);
rec.setLayoutManager(aw1);
madapter = new ProductAdapter(getContext(), example, getLayoutInflater());
rec.setAdapter(madapter);
madapter.notifyDataSetChanged();
total = krnjg.findViewById(R.id.vtotal);
btnpesan = krnjg.findViewById(R.id.btnpsn);
for (int i = 0;i < example.size();i++){
sub = sub + example.get(i).getPrice();
}
Locale locale = new Locale("in","ID");
NumberFormat formatrupiah = NumberFormat.getCurrencyInstance(locale);
total.setText(formatrupiah.format(sub));
Product adapter.java
#Override
public void onBindViewHolder(#NonNull final MyViewHolder holder, final int position) {
Locale locale = new Locale("in","ID");
NumberFormat formatrupiah = NumberFormat.getCurrencyInstance(locale);
holder.nmPro.setText(mData.get(position).getTitle());
holder.imge.setImageResource(mData.get(position).getProductImage());
holder.hrg.setText(formatrupiah.format(mData.get(position).getPrice()));
holder.cd.setActivated(mData.get(position).selected);
holder.del.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mData.remove(holder.getAdapterPosition());
double sub = 0;
for (int i = 1; i<example.size();i++){
sub -= example.get(i).getPrice();
}
notifyDataSetChanged();
Toast.makeText(mCon,"Barang "+holder.nmPro.getText()+" di hapus dari keranjang",Toast.LENGTH_SHORT).show();
}
});
}
i expect that the holder won't worked even the data that was holder it for just on that view not on the fragment that used to handle or maybe another ways to find it out because the total and the recycler is on different fragment that there is on adapter and fragment it's self

I have been solved this I just used a new classes to hold the click and price even I delete the item the price still same, which else item still on there. So this is I used for
public double getTotalPrice() {
double totalPrice = 0;
for (int i = 0; i < mData.size(); ++i) {
totalPrice = totalPrice + mData.get(i).getPrice();
}
return totalPrice;
}
this class to get the total price on adapter and I got the class on holder too. For when I deleted the item the price is still same which item still on there like this I used it for
holder.del.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mData.remove(holder.getAdapterPosition());
notifyDataSetChanged();
tvTotal.setText(formatrupiah.format(getTotalPrice()));
Toast.makeText(mCon,"Barang "+holder.nmPro.getText()+" di hapus dari keranjang",Toast.LENGTH_SHORT).show();
}
});
mData is to get the data product from other activity I inputed and remove is to remove item from the cart and tvTotal is the price whenever the price inputed it can be deleted using this class on holder

If i select an item in a spinner it should not be selected again and if i delete an item it should appear again in the list of spinner items

In spinner, whenever I selected an item it should be inactive or stop user from selecting again and whenever the user deletes the selected item that item should be active and user can select again. Items in the list should be added and deleted dynamically. Can anyone tell me how to do this?
Any help will be appreciated. If you can't understand the question please comment here
my code for adding new item and removing that item given below:
public void add_click()
{
add.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
spin = findViewById(R.id.spinnerLayout);
LayoutInflater layoutInflater = (LayoutInflater) getBaseContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View addview = (layoutInflater).inflate(R.layout.spinner, null);
addview.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup
.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
game_name_Spinner = addview.findViewById(R.id.gamename);
player_level_Spinner = addview.findViewById(R.id.level);
remove = addview.findViewById(R.id.delete_button);
s_game = name1.getSelectedItem().toString();
s_level = level1.getSelectedItem().toString();
game_name_Spinner.setText(s_game);
player_level_Spinner.setText(s_level);
remove.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
String last_removed;
((LinearLayout) addview.getParent()).removeView(addview);
gamename.addAll(removed_item);
adap1 = new ArrayAdapter<String>(PlayerProfile.this, android.R.layout
.simple_spinner_dropdown_item, gamename);
name1.setAdapter(adap1);
adap1.notifyDataSetChanged();
}
});
if (name1.getSelectedItemPosition()>0)
{
int count = removed_item.size();
for (int i = 0; i<=count; i++)
{
game_name_Spinner.setId(i);
}
idl = game_name_Spinner.getId();
game_removed = name1.getSelectedItem().toString();
removed_item.add(game_removed);
LinkedHashSet<String> hashSet = new LinkedHashSet<String>();
hashSet.add(game_removed);
removed_item.clear();
removed_item.add(game_removed);
adap1.remove(name1.getSelectedItem().toString());
}
container = findViewById(R.id.container);
container.addView(addview);
name1.setSelection(0);
level1.setSelection(0);
}
});
}

ArrayList and ListView are not being populated

I am completely lost and have no idea why my ListView is not being populated. In my method where I am inserting data into my ArrayList, it says my adapter symbol cannot be resolved, but as far as I know I have properly declared the adapter in my onCreate.
Am I correct in assuming that if I have a ListView inside of my activity, set up an ArrayList that fills my adapter, and then tie that adapter to the ListView that my ListView will auto-populate in my activity whenever the array receives information?
Here are my declarations inside of my onCreate.
ListView listView = (ListView) findViewById(R.id.dispScores);
ArrayList<viewScores> savedScores = new ArrayList<viewScores>();
ScoreAdapter adapter = new ScoreAdapter(this, savedScores);
adapter.setDropDownViewResource(android.R.layout.simple_list_item_1);
listView.setAdapter(adapter);
These are the methods I am using to add data into my ArrayList.
public View.OnClickListener onClickListener = new View.OnClickListener() {
#Override
public void onClick(View view) {
EditText input1 = (EditText) findViewById(R.id.scorePrompt);
TextView output1 = (TextView) findViewById(R.id.textTotal);
String blankCheck = input1.getText().toString(); //CHANGE INPUT IN scorePrompt TO STRING
switch (view.getId()) {
case R.id.buttTotal:
if (blankCheck.equals("")) {
Toast blankError = Toast.makeText(getApplicationContext(), "YOU CANT SKIP HOLES JERK", Toast.LENGTH_LONG);
blankError.show();
break;
} else {
int num1 = Integer.parseInt(input1.getText().toString()); //Get input from text box
int sum = num1 + score2;
score2 = sum;
output1.setText("Your score is : " + Integer.toString(sum));
//ATTEMPTING TO WRITE TO ARRAYLIST
viewScores addScore = new viewScores(input1.getText().toString());
adapter.notifyDataSetChanged();
adapter.add(addScore); //WHY DOESNT THIS WORK?
j++;
input1.setText(""); //Clear input text box
break;
}
case R.id.allScores: //CHANGE THIS TO AN EDIT BUTTON, ADD A HOLE NUMBER COUNTER AT TOP OF SCREEN!!!!!
output1.setText("you messed up");
break;
case R.id.editScore: //Need to set up Save Array before we can edit
//CURRENTLY ONLY DISPLAYS THE LAST NUNMBER IN THE TEXTEDIT, NEED TO SET UP LISTVIEW!!!!!!
for (int i=0; i < j; i++){
// output1.setText(savedScores.get(i));
} break;
}
}
};
public class viewScores {
public String hole;
public viewScores(String holeNum) {
this.hole = holeNum;
}
}
public class ScoreAdapter extends ArrayAdapter<viewScores> {
public ScoreAdapter(Context context, ArrayList<viewScores> scores) {
super(context, 0, scores);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
viewScores score1 = getItem(position);
if (convertView == null){
convertView = LayoutInflater.from(getContext()).inflate(R.layout.activity_main, parent, false);
}
TextView ListView1 = (TextView) convertView.findViewById(R.id.dispScores);
ListView1.setText(score1.hole);
return convertView;
}
}
The app doesn't crash and I am able to enter values into my EditText. Below is the XML for the ListView.
<ListView
android:id="#+id/dispScores"
android:layout_width="250dp"
android:layout_height="250dp"
android:layout_marginLeft="15dp"
android:layout_marginStart="15dp"
app:layout_constraintLeft_toLeftOf="parent"
tools:layout_constraintLeft_creator="1"
tools:layout_constraintTop_creator="1"
tools:layout_editor_absoluteY="244dp" />

Whenever you update the model observed by your adapter, you need to call
adapter.notifyDataSetChanged()
So in your case,
viewScores addScore = new viewScores(input1.getText().toString());
savedScores.add(addScore);
adapter.notifyDataSetChanged()

ArrayAdapter strange behaviour with id when items's height exceed Listview height

I'm facing a strange behaviour using an ArrayAdapter.
When the number of listview item exceed the height of the listView (say after item 8), the next item get the id 0 instead the id 9.
In my opinion this type of issue was explained here with the convertView, but i use it in the same way (i think).
The following code is my ArrayAdapter.
public class StepsAdapter extends ArrayAdapter<String> {
Context context;
List<String> steps;
public StepsAdapter(Context context, int resourceId, List<String> steps) {
super(context, resourceId, steps);
this.context = context;
}
private class ViewHolder {
EditText stepValue;
ImageView removeStep;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
final String step = getItem(position);
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.row_step, null);
holder = new ViewHolder();
holder.stepValue = (EditText) convertView.findViewById(R.id.stepEdit);
holder.removeStep = (ImageView) convertView.findViewById(R.id.removeStep);
holder.stepValue.setText(step);
holder.removeStep.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context,"* Remove id step " + position, Toast.LENGTH_LONG).show();
steps.remove(position);
notifyDataSetChanged();
}
});
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
return convertView;
}
}
Then my main activity where i get existing data and put it in my listView, the add button and the save button.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_game);
mContext = getApplicationContext();
steps = new ArrayList<String>();
stepsAdapter = new StepsAdapter(mContext,R.layout.row_step,steps);
Gson gson = new GsonBuilder().create();
game = gson.fromJson(gameJson, Games.class);
/*
* Settings values
*/
gameNameValue.setText(game.getName());
gameBackgroundPreview.setBackgroundColor(game.getColor());
colorSelected = game.getColor();
for(int i = 0; i < game.getSteps().size() ; i++){
//steps.add(game.getSteps().get(i).toString());
//notifyDataSetChanged();
stepsAdapter.add(game.getSteps().get(i).toString());
}
final ListView listSteps = (ListView) findViewById(R.id.listViewSteps);
listSteps.setAdapter(stepsAdapter);
gameNameValue.setText(gameName);
addSteps.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
stepsId = steps.size();
Toast.makeText(getApplicationContext(), "addSteps : " + stepsId, Toast.LENGTH_LONG).show();
stepsAdapter.insert("newstep", stepsId);
}
});
buttonSaveGame.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String valueEditGameName = gameNameValue.getText().toString();
int valueColorBackaground = colorSelected;
String picture = "testPic";
for(int i=0; i < listSteps.getChildCount(); i++) {
LinearLayout rowLayout = (LinearLayout) listSteps.getChildAt(i);
//Log.e(TAG, ">> :) layout >>" + listSteps.getChildAt(i).getClass().getName());
EditText editRow = (EditText) rowLayout.getChildAt(0);
stepsValues.add(editRow.getText().toString());
//Log.e(TAG, ">> :) inside layout >>" + editRow.getText().toString());
}
if(valueEditGameName.trim().length() > 0 && picture.trim().length() >0 ){
Games game = new Games(valueEditGameName,valueColorBackaground,picture,stepsValues);
String goToSave = game.createJson();
Log.e(TAG, ">>Saved>>" + goToSave);
final CkdFile file = new CkdFile();
String saved = file.writeToSDFile(game.getName(), goToSave);
Toast.makeText(mContext, saved, Toast.LENGTH_LONG).show();
Intent backToMain = new Intent(mContext,MainActivity.class);
startActivity(backToMain);
} else {
Toast.makeText(mContext, "Fill all texts", Toast.LENGTH_LONG).show();
}
}
});
}
I try to add items in 2 different ways :
add item through : List steps
add item through : StepsAdapter stepsAdapter
Both give me same behaviour.
If someone has a clue to help understanding what i'm doing wrong with my implementation of ListView/ArrayAdapter.
Thanks in advance !
EDIT 1 :
After pushing some logs everywere, it understand the strange behaviour :
My adapter have only 6 slots (the limit came from the size of the listview in layout), and when my arraylist have more than 6 items, the getView select items only between 0 and 5.
I'm searching now a way to get the position in ArrayList and not the position in arrayadapter.

I faced same issue recently. Add following overrides to Adapter:
#Override
public int getViewTypeCount() {
return getCount();
}
#Override
public int getItemViewType(int position) {
return position;
}

I found a simple xml "trick" to avoid this behaviour : i set a biger height to listView.
<ListView
android:layout_width="match_parent"
android:layout_height="1000dp"
android:layout_gravity="center_horizontal"
android:id="#+id/listViewSteps"
android:layout_margin="10dp">
</ListView>
It's not really resolve but a take it ...

Updating a List View

I've been stuck with this for a long while and it's really frustrating. Basically the app starts off with a ListView containing Movie Titles, their Gross, and Year.
The user then can add a new movie, gross, and year using a different activity from the menu. The values are then returned back to the first activity and is placed at the bottom of the list.
This is where my problem begins. The first problem I had is that the app Force Closes when it's about to display the new item. Now, it doesn't want to display at all. Here's the Code:
public class Lab7_084106 extends ListActivity {
private SampleCustomAdapter adapter;
private ArrayList<MyMovies> movieList;
public static boolean Flag = false;
#SuppressWarnings("null")
#Override
public void onCreate(Bundle savedInstanceState) {
//create stuff
super.onCreate(savedInstanceState);
movieList = new ArrayList<MyMovies>();
Intent data = getIntent();
//Flag = data.getStringExtra("Flag");
String[] oldMovieList = getResources().getStringArray(R.array.movieArray);
String[] oldGrossList = getResources().getStringArray(R.array.worldwideGross);
String[] oldYearList = getResources().getStringArray(R.array.yearArray);
//if there's no new movie to display
if(!Flag){
for (int i = 0; i < oldMovieList.length; i++) {
MyMovies newMovie = new MyMovies();
newMovie.setMovie(oldMovieList[i] + "NEW");
newMovie.setGross(oldGrossList[i]);
newMovie.setYear(oldYearList[i]);
movieList.add(newMovie);
}
//adapter = new SampleCustomAdapter(movieList);
//setContentView(R.layout.row);
//setListAdapter(adapter);
}
else{
Toast.makeText(getApplicationContext(), "Else Entered", Toast.LENGTH_SHORT).show();
int newLength = 50; //oldMovieList.length + 1;
//create new array to store the new value
String[] newMovieArray = new String[newLength];
String[] newGrossArray = new String[newLength];
String[] newYearArray = new String[newLength];
//populate the new list with the old one plus the new one
for (int i = 0; i < newLength; i++) {
if( i != newLength - 1){
newMovieArray[i] = oldMovieList[i];
newGrossArray[i] = oldGrossList[i];
newYearArray[i] = oldYearList[i];
}
else{
newMovieArray[i] = data.getStringExtra("Title");
newGrossArray[i] = data.getStringExtra("Gross");
newYearArray[i] = data.getStringExtra("Year");
}
}
//populate the old one using the new list
for (int i = 0; i < newLength; i++) {
oldMovieList[i] = newMovieArray[i];
oldGrossList[i] = newGrossArray[i];
oldYearList[i] = newYearArray[i];
}
//display stuff
for (int i = 0; i < newLength; i++) {
MyMovies newMovie = new MyMovies();
newMovie.setMovie(oldMovieList[i]);
newMovie.setGross(oldGrossList[i]);
newMovie.setYear(oldYearList[i]);
movieList.add(newMovie);
}
//adapter = new SampleCustomAdapter(movieList);
//setListAdapter(adapter);
}
adapter = new SampleCustomAdapter(movieList);
setListAdapter(adapter);
ListView lv = getListView();
lv.setTextFilterEnabled(true);
//set stuff such that Page2 sends back a result to page 1
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
TextView t = (TextView) view.findViewById(R.id.title);
String name = (String) t.getText();
Toast.makeText(getApplicationContext(), name, Toast.LENGTH_SHORT).show();
}
});
}
private class SampleCustomAdapter extends BaseAdapter {
private ArrayList<MyMovies> internalList;
String[] oldMovieList = getResources().getStringArray(R.array.movieArray);
String[] oldGrossList = getResources().getStringArray(R.array.worldwideGross);
String[] oldYearList = getResources().getStringArray(R.array.yearArray);
private ArrayList<MyMovies> GetSearchResults(){
ArrayList<MyMovies> results = new ArrayList<MyMovies>();
// make sure the arrays have the same length
for (int i = 0; i < oldMovieList.length; i++) {
MyMovies sr = new MyMovies();
sr.setMovie(oldMovieList[i]);
sr.setGross(oldGrossList[i]);
sr.setYear(oldYearList[i]);
results.add(sr);
}
return results;
}
public SampleCustomAdapter(ArrayList<MyMovies> contacts){
internalList = contacts;
}
#Override
public int getCount() {
// TODO Auto-generated method stub
return internalList.size();
}
#Override
public Object getItem(int index) {
// TODO Auto-generated method stub
return internalList.get(index);
}
#Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// NOTE: you can only do this if you have access to the Activity object
// which is why this is an inner class
LayoutInflater inflater = getLayoutInflater();
View view;
//System.out.println(parent.getClass().getName());
//System.out.println(position);
if (convertView==null){
view = inflater.inflate(R.layout.row, null);
}
else{
view = convertView;
}
// extract the views to be populated
TextView movie = (TextView) view.findViewById(R.id.title);
TextView gross = (TextView) view.findViewById(R.id.gross);
TextView date = (TextView) view.findViewById(R.id.date);
// extract the object that will fill these
MyMovies movies = GetSearchResults().get(position);
//MyMovies movies = internalList.get(position);
movie.setText(movies.getMovie());
gross.setText(movies.getGross());
date.setText(movies.getYear());
// return the view
return view;
}
}
//menu lawl
#Override
public boolean onCreateOptionsMenu(Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menupage1, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
//Handle item selection using item.getItemId()
switch(item.getItemId()){
case R.id.addMovie:
AddMovie();
break;
}
return true;
}
//end menu stuff lol
public void AddMovie(){
Intent intent2 = new Intent(this, com.Android.Lab7.addMovie.class);
startActivity(intent2);
finish();
}
}
The Flag Boolean variable basically tells if the user added a movie. If the user added a movie, it will enter the else statement and update from there. I'm really confused where to put this if-else statement.
I ran a few experiments with the GetSearchResult function of SampleCustomAdapter and found out that it directly affects the output of the ListView. I tried placing the if-else statement there but I ended up with a LOT of items in the ListView.
Using adapter.notifyDataSetChanged(); gives a NullPointerException error and points to where I placed it. So even if do something like:
MyMovies newMovie = new MyMovies();
newMovie.setMovie(data.getStringExtra("Title"));
newMovie.setGross(data.getStringExtra("Gross"));
newMovie.setYear(data.getStringExtra("Year"));
movieList.add(newMovie);
adapter.notifyDataSetChanged();
As the else block, it does not work. I think it has something to do with the fact that I'm getting my initial values from the string.xml resource folder and not via hardcode or user input.
This problem has been frustrating me ever since 2-3 days ago and help is really appreciated. Thanks.

you just have to notify the data set Changed on your adapter
movieList.add(newMovie);
adapter.notifyDataSetChanged();
the listview will be updated automatically
UPDATE
you can always use the following it'll work but I prefer notifying the adapter.
movieList.add(newMovie);
adapter = new SampleCustomAdapter(movieList);
setListAdapter(adapter);

you should use adapter.notifyDataSetChanged(). CheckThis Link