Having a object that has 3 properties:
Item
String date;
int value1;
int value2;
I have first ArrayList<Item> listA which contains:
2017-01-18, 0, 0
2017-01-17, 0, 0
2017-01-16, 0, 0
2017-01-15, 0, 0
Second ArrayList<Item> listB which contains:
2017-01-18, 7, 3
2017-01-15, 4, 0
I want to combine both lists, into a final one, having the values summed by same date
2017-01-18, 7, 3
2017-01-17, 0, 0
2017-01-16, 0, 0
2017-01-15, 4, 0
Try this:
public static void sumList(List<Item> list1, List<Item> list2){
List<Item> bigger;
List<Item> smaller;
if(list1.size() > list2.size()){
bigger = list1;
smaller = list2;
} else{
bigger = list2;
smaller = list1;
}
for(int i = 0; i < bigger.size(); i++){
for(int j = 0; j < smaller.size(); j++){
if(bigger.get(i).date.equals(smaller.get(j).date)){
bigger.get(i).value1 = bigger.get(i).value1 + smaller.get(j).value1
bigger.get(i).value2 = bigger.get(i).value2 + smaller.get(j).value2
}
}
}
}
happy coding!
try this
List<Item> firstList = new ArrayList<Item>();
List<Item> secondList = new ArrayList<Item>();
HashMap<String, Item> hashMap = new HashMap<String, Item>();
for(Item item: firstList) {
hashMap.put(item.date, item);
}
for(Item item: secondList) {
Item tempItem = hashMap.get(item.date);
if(tempItem != null) {
tempItem.add(item);
hashMap.put(tempItem.date, tempItem);
} else {
hashMap.put(item.date, item);
}
}
and your item class be like
class Item {
String date;
int value1;
int value2;
public void add(Item item) {
this.value1 = this.value1 + item.value1;
this.value2 = this.value2 + item.value2;
}
}
Related
I call the method below to update my listview
ListView list = (ListView) listView.findViewById(R.id.plan_list);
itemsList = sortAndAddSections(getItems_search(name));
ListAdapter adapter = new ListAdapter(getActivity(), itemsList);
list.setAdapter(adapter);
but that code is associated with a value that changes and also this is the other code
private ArrayList<plan_model> getItems_search(String param_cusname) {
Cursor data = myDb.get_search_plan(pattern_email, param_name);
int i = 0;
while (data.moveToNext()) {
String date = data.getString(3);
String remarks = data.getString(4);
items.add(new plan_model(cusname, remarks);
}
return items;
}
and this is my sorter
private ArrayList sortAndAddSections(ArrayList<plan_model> itemList) {
Collections.sort(itemList);
plan_model sectionCell;
tempList.clear();
tmpHeaderPositions.clear();
String header = "";
int addedRow = 0;
int bgColor = R.color.alt_gray;
for (int i = 0; i < itemList.size(); i++) {
String remarks = itemList.get(i).getRemarks();
String date = itemList.get(i).getDate();
if (!(header.equals(itemList.get(i).getDate()))) {
sectionCell = new plan_model(remarks, date);
sectionCell.setToSectionHeader();
tmpHeaderPositions.add(i + addedRow);
addedRow++;
tempList.add(sectionCell);
header = itemList.get(i).getDate();
bgColor = R.color.alt_gray;
}
sectionCell = itemList.get(i);
sectionCell.setBgColor(bgColor);
tempList.add(sectionCell);
if (bgColor == R.color.alt_gray) bgColor = R.color.alt_white;
else bgColor = R.color.alt_gray;
}
tmpHeaderPositions.add(tempList.size());
for (int i = 0; i < tmpHeaderPositions.size() - 1; i++) {
sectionCell = tempList.get(tmpHeaderPositions.get(i));
sectionCell.setDate(sectionCell.getDate() + " (" +
(tmpHeaderPositions.get(i + 1) - tmpHeaderPositions.get(i) - 1) + ")");
}
return tempList;
}
my question is the value name changes but my listview is not how can I update my listview? because i need to update it based on search parameter
If your itemList is being updated properly, you don't need to create another instance of the adapter, just use notifyDataSetChanged():
private void createList() {
ListView list = (ListView) listView.findViewById(R.id.plan_list);
itemsList = sortAndAddSections(getItems_search(name));
adapter = new ListAdapter(getActivity(), itemsList);
list.setAdapter(adapter);
}
private void updateList() {
sortAndAddSections(getItems_search(name)); // Update itemList without re-assign its value, otherwise the adapter will loose reference
adapter.notifyDataSetChanged()
}
In getItems_search() add this line at the beginning:
items.clear();
Every time the value of name changes you have to do the following:
itemsList.clear();
itemsList = sortAndAddSections(getItems_search(name));
list.setAdapter(new ListAdapter(getActivity(), itemsList));
I have 2 xml files
Header and Section
then i use some condition to segregate those two and the output of that is this
|8/2/2018|
----------
Data 1
Data 2
|8/2/2018|
----------
Data 1
Data 2
Data 3
It is a listview that groups data with same date and the 1 date header for them.
My question is how can I count each data then update the header? like this
|8/2/2018 (2)|
----------
Data 1
Data 2
|8/2/2018 (3)|
----------
Data 1
Data 2
Data 3
Im using Listview and ListAdapter extends ArrayAdapter
where do i will update?
here
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
ItemModel cell = (ItemModel) getItem(position);
if (cell.isSectionHeader()) {
//Display Date in Header XML
} else {
//Display in Section XML
}
}
or here
private ArrayList sortAndAddSections(ArrayList<ItemModel> itemList) {
ArrayList<ItemModel> tempList = new ArrayList<>();
Collections.sort(itemList);
String header = "";
for (int i = 0; i < itemList.size(); i++) {
if (!(header.equals(itemList.get(i).getDate()))) {
String data = itemList.get(i).getRemarks();
String date = itemList.get(i).getDate()
ItemModel sectionCell = new ItemModel(date,data);
sectionCell.setToSectionHeader();
tempList.add(sectionCell);
header = itemList.get(i).getDate();
}
tempList.add(itemList.get(i));
}
return tempList;
}
Updated
Here is how I transfer the data from database to array
private ArrayList<ItemModel> getItems() {
Cursor data = myDb.get_plan(email);
ArrayList<ItemModel> items = new ArrayList<>();
while (data.moveToNext()) {
String date = data.getString(3);
String data1 = data.getString(4);
items.add(new ItemModel(date,data1));
}
return items;
}
then this where the condition goes
private ArrayList sortAndAddSections(ArrayList<ItemModel> itemList) {
ArrayList<ItemModel> tempList = new ArrayList<>();
String header = "";
for (int i = 0; i < itemList.size(); i++) {
if (!(header.equals(itemList.get(i).getDate()))) {
String date = itemList.get(i).getDate();
String getData1 = itemList.get(i).getData1();
ItemModel sectionCell = new ItemModel(date,data1);
sectionCell.setToSectionHeader();
tempList.add(sectionCell);
header = itemList.get(i).getDate();
}
tempList.add(itemList.get(i));
}
return tempList;
}
this is where i set it in textview
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
ItemModel cell = (ItemModel) getItem(position);
if (cell.isSectionHeader()) {
v = inflater.inflate(R.layout.section_header, null);
v.setClickable(false);
TextView header = (TextView) v.findViewById(R.id.list_date);
header.setText(cell.getDate());
} else {
v = inflater.inflate(R.layout.listview_plan, null);
TextView tv_data1 = v.findViewById(R.id.list_data1);
tv_cusname.setText(cell.getData1());
}
return v;
}
Try this:
private ArrayList sortAndAddSections(ArrayList<ItemModel> itemList) {
ArrayList<ItemModel> tempList = new ArrayList<>();
ArrayList<Integer> tmpHeaderPositions = new ArrayList<>(); // Added
String header = "";
ItemModel sectionCell; // Changed
int addedRow = 0; // Edited
for (int i = 0; i < itemList.size(); i++) {
if (!(header.equals(itemList.get(i).getDate()))) {
String date = itemList.get(i).getDate();
String getData1 = itemList.get(i).getData1();
sectionCell = new ItemModel(date,data1); // Changed
sectionCell.setToSectionHeader();
tmpHeaderPositions.add(i + addedRow); // Edited
addedRow++; // Edited
tempList.add(sectionCell);
header = itemList.get(i).getDate();
}
tempList.add(itemList.get(i));
}
// Added this code block
tmpHeaderPositions.add(tempList.size());
for (int i = 0; i < tmpHeaderPositions.size() - 1; i++) {
sectionCell = tempList.get(tmpHeaderPositions.get(i));
sectionCell.setDate(sectionCell.getDate() + "(" +
(tmpHeaderPositions.get(i + 1) - tmpHeaderPositions.get(i) - 1) + ")");
}
return tempList;
}
Hope that helps!
You can setText later when you get the list of data and then with the help of arraylist.length() you can set the text into section.
I want to make a Custom ListView with sorted alphabetical apps using section Indexer. Since Section Indexer only treat with ArrayList<String> so how do I write custom adapter that have section indexing functionality. Same like this:
Please suggest some solution.
Thats My code
class MyAZAdapter extends ArrayAdapter implements SectionIndexer {
ArrayList myElements;
HashMap azIndexer;
String[] sections;
List apps;
public MyAZAdapter(Context context, int textViewResourceId, List<T> objects, List<ApplicationInfo> apps) {
super(context, textViewResourceId, objects);
myElements = (ArrayList<String>) objects;
azIndexer = new HashMap<String, Integer>(); //stores the positions for the start of each letter
this.apps = apps;
int size = elements.size();
for (int i = size - 1; i >= 0; i--) {
String element = elements.get(i);
//We store the first letter of the word, and its index.
azIndexer.put(element.substring(0, 1), i);
}
Set<String> keys = azIndexer.keySet(); // set of letters
Iterator<String> it = keys.iterator();
ArrayList<String> keyList = new ArrayList<String>();
while (it.hasNext()) {
String key = it.next();
keyList.add(key);
}
Collections.sort(keyList);//sort the keylist
sections = new String[keyList.size()]; // simple conversion to array
keyList.toArray(sections);
}
public int getPositionForSection(int section) {
if (section == 35) {
return 0;
}
for (int i = 0; i < myElements.size(); i++) {
String l = myElements.get(i);
char firstChar = l.toUpperCase().charAt(0);
if (firstChar == section) {
return i;
}
}
return -1;
}
public int getSectionForPosition(int position) {
Log.v("getSectionForPosition", "called");
return 0;
}
public Object[] getSections() {
return sections; // to string will be called to display the letter
}
}class MyAZAdapter<T> extends ArrayAdapter<T> implements SectionIndexer {
ArrayList<String> myElements;
HashMap<String, Integer> azIndexer;
String[] sections;
List<ApplicationInfo> apps;
public MyAZAdapter(Context context, int textViewResourceId, List<T> objects, List<ApplicationInfo> apps) {
super(context, textViewResourceId, objects);
myElements = (ArrayList<String>) objects;
azIndexer = new HashMap<String, Integer>(); //stores the positions for the start of each letter
this.apps = apps;
int size = elements.size();
for (int i = size - 1; i >= 0; i--) {
String element = elements.get(i);
//We store the first letter of the word, and its index.
azIndexer.put(element.substring(0, 1), i);
}
Set<String> keys = azIndexer.keySet(); // set of letters
Iterator<String> it = keys.iterator();
ArrayList<String> keyList = new ArrayList<String>();
while (it.hasNext()) {
String key = it.next();
keyList.add(key);
}
Collections.sort(keyList);//sort the keylist
sections = new String[keyList.size()]; // simple conversion to array
keyList.toArray(sections);
}
public int getPositionForSection(int section) {
if (section == 35) {
return 0;
}
for (int i = 0; i < myElements.size(); i++) {
String l = myElements.get(i);
char firstChar = l.toUpperCase().charAt(0);
if (firstChar == section) {
return i;
}
}
return -1;
}
public int getSectionForPosition(int position) {
Log.v("getSectionForPosition", "called");
return 0;
}
public Object[] getSections() {
return sections; // to string will be called to display the letter
}
}
My AppsActivity code
elements = new ArrayList<String>();
List<ApplicationInfo> apps = getInstalledApplication(getActivity());
for (int i = 0; i < apps.size(); i++) {
elements.add(apps.get(i).loadLabel(getActivity().getPackageManager()).toString());
}
Collections.sort(elements,String.CASE_INSENSITIVE_ORDER); // Must be sorted!
// listview
myListView = (ListView) rootView.findViewById(R.id.myListView);
//myListView.setFastScrollEnabled(true);
MyAZAdapter<String> adapter = new MyAZAdapter<String>(
getActivity(), android.R.layout.simple_list_item_1,
elements, apps);
myListView.setAdapter(adapter);
SideBar indexBar = (SideBar) rootView.findViewById(R.id.sideBar);
indexBar.setListView(myListView);
adapter.sort(new Comparator<String>() {
public int compare(String object1, String object2) {
return object2.compareTo(object1);
};
});
you need the above code right before:
myListView.setAdapter(adapter);
I have to store and manage a volume list in the format:
"100 ml", "200 ml", "300 ml"...
I'm using the SharedPreferences with JSON to store this everytime the list is changed.
I want the list to be ordered, so 100 < 1000, but it is showing like 1000 and 2000 before 300.
Here is my comparator:
mVolumeComparator = new Comparator<String>() {
#Override
public int compare(String s1, String s2) {
int volume1 = Integer.parseInt(s1.replace(" ml", ""));
int volume2 = Integer.parseInt(s2.replace(" ml", ""));
if (volume1 > volume2) {
return 1;
} else if (volume2 > volume1) {
return -1;
} else {
return 0;
}
}
};
And here is my get method:
public static ArrayList<String> getVolumesFromPreference(Context ctx) {
if (!ctx.getSharedPreferences(KEY_SHARED_PREFERENCES, MODE_PRIVATE).contains(KEY_VOLUMES_BUNDLE)) {
startDefaultVolumes(ctx, KEY_VOLUMES_BUNDLE);
}
try {
JSONArray jsonArray = new JSONArray(ctx.getSharedPreferences(KEY_SHARED_PREFERENCES, MODE_PRIVATE).getString(KEY_VOLUMES_BUNDLE, null));
ArrayList<String> lista = new ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
lista.add(jsonArray.getString(i));
}
Collections.sort(lista, mVolumeComparator);
return lista;
} catch (JSONException e) {
e.printStackTrace();
return null;
}
}
private static void startDefaultVolumes(Context ctx, String key_bundle) {
JSONArray jsonArray = new JSONArray();
jsonArray.put("269 ml");
jsonArray.put("350 ml");
jsonArray.put("473 ml");
jsonArray.put("550 ml");
jsonArray.put("600 ml");
SharedPreferences.Editor editor = ctx.getSharedPreferences(KEY_SHARED_PREFERENCES, MODE_PRIVATE).edit();
editor.putString(key_bundle, jsonArray.toString());
editor.commit();
}
use Integer.valueOf() method instead Integer.parceInt()
I will recommend you to store only the value "100", "1000", "300" and UNIT if you have more than unit available.
SO, you can order it just with a normal Integer comparator, and then apply the "ml" suffix at runtime
Try this code for sorting arraylist in ascending order.
ArrayList<int> lista = new ArrayList<>();
for (int i = 0; i < jsonArray.length(); i++) {
lista.add(Integer.parseInt(jsonArray.getString(i)));
}
Collections.sort(lista , new Comparator<Integer >() {
#Override
public int compare(Integer lhs, Integer rhs) {
return Integer.valueOf(lhs).compareTo(Integer.valueOf(rhs));
}
});
This is my code:
public ArrayList generare_diferente(){
int rezultat;
ArrayList<String> termeni= new ArrayList<String>();
int termA=parseInt(String.valueOf(randomBetween(1, 20)));
int termB=parseInt(String.valueOf(randomBetween(1, 20)));
if(termA<termB){
int aux; aux=termA; termA=termB; termB=aux;
rezultat=termA-termB;
String diff = termA + "-" + termB;
termeni.add(String.valueOf(rezultat));
termeni.add(diff);
Log.v("termeeeeni", String.valueOf(termeni));
}
return termeni;
}
public void generare_3_diferente() {
ArrayList<String> scaderea1 = new ArrayList<String>();
ArrayList<String> scaderea2 = new ArrayList<String>();
ArrayList<String> scaderea3 = new ArrayList<String>();
int raspuns_corect;
int[] raspunsuri = new int[]{0, 0, 0, 0};
int i = 0;
do {
scaderea1 = generare_diferente();
scaderea2 = generare_diferente();
scaderea3 = generare_diferente();
Button scadere1 = (Button) findViewById(R.id.scadere1);
Button scadere2 = (Button) findViewById(R.id.scadere2);
Button scadere3 = (Button) findViewById(R.id.scadere3);
scadere1.setText((CharSequence) scaderea1.get(1));
scadere2.setText((CharSequence) scaderea2.get(1));
scadere3.setText((CharSequence) scaderea3.get(1));
}
while (scaderea1.get(0) == scaderea2.get(0) || scaderea2.get(0) == scaderea3.get(0) || scaderea3.get(0) == scaderea1.get(0));
raspunsuri[1]= Integer.parseInt(scaderea1.get(0));
raspunsuri[2]= Integer.parseInt(scaderea2.get(0));
raspunsuri[3]= Integer.parseInt(scaderea3.get(0));
pozitia_corecta = parseInt(String.valueOf(randomBetween(1, 3)));
raspuns_corect = raspunsuri[pozitia_corecta];
TextView rezultat = (TextView) findViewById(R.id.Rezultat);
rezultat.setText(raspuns_corect);
}
I'm getting this error:
java.lang.RuntimeException: Unable to start activity : java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
Caused by: java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
at java.util.ArrayList.get(ArrayList.java:308)
at com.example.pinguin.MyActivity.generare_3_diferente(MyActivity.java:93)
at .onCreate(MyActivity.java:24)
I don't understand why, the array should not have the size 0.
thank you!
your code seems wrong. because in generare_diferente() if termA<termB or equal you return empty array and then in generare_3_diferente() you try to read data from empty list.
first you should handle this issue.then I think your random number are not generate so termA and termB both is zero or anything and if statement are not true.
change code like this
public ArrayList generare_diferente(){
int rezultat;
ArrayList<String> termeni= new ArrayList<String>();
int termA=random.nextInt(max - min + 1) + min ;
int termB=random.nextInt(max - min + 1) + min ;
if(termA<termB){
int aux; aux=termA; termA=termB; termB=aux;
rezultat=termA-termB;
String diff = termA + "-" + termB;
termeni.add(String.valueOf(rezultat));
termeni.add(diff);
Log.v("termeeeeni", String.valueOf(termeni));
}
return termeni.clone();
}
public void generare_3_diferente() {
ArrayList<String> scaderea1 = new ArrayList<String>();
ArrayList<String> scaderea2 = new ArrayList<String>();
ArrayList<String> scaderea3 = new ArrayList<String>();
int raspuns_corect;
int[] raspunsuri = new int[]{0, 0, 0, 0};
int i = 0;
do {
scaderea1 = generare_diferente();
scaderea2 = generare_diferente();
scaderea3 = generare_diferente();
Button scadere1 = (Button) findViewById(R.id.scadere1);
Button scadere2 = (Button) findViewById(R.id.scadere2);
Button scadere3 = (Button) findViewById(R.id.scadere3);
if(scaderea1.size()>0 && scaderea2.size()>0 && scaderea3.size()>0){
scadere1.setText((CharSequence) scaderea1.get(1));
scadere2.setText((CharSequence) scaderea2.get(1));
scadere3.setText((CharSequence) scaderea3.get(1));
}else{
scadere1.setText("something");
scadere2.setText("something");
scadere3.setText("something");
break;
}
}
while (scaderea1.get(0) == scaderea2.get(0) || scaderea2.get(0) == scaderea3.get(0) || scaderea3.get(0) == scaderea1.get(0));
if(scaderea1.size()>0 && scaderea2.size()>0 && scaderea3.size()>0){
raspunsuri[1]= Integer.parseInt(scaderea1.get(0));
raspunsuri[2]= Integer.parseInt(scaderea2.get(0));
raspunsuri[3]= Integer.parseInt(scaderea3.get(0));
}else{
raspunsuri[1]= Integer.parseInt("0");
raspunsuri[2]= Integer.parseInt("0");
raspunsuri[3]= Integer.parseInt("0");
}
pozitia_corecta = parseInt(String.valueOf(randomBetween(1, 3)));
raspuns_corect = raspunsuri[pozitia_corecta];
TextView rezultat = (TextView) findViewById(R.id.Rezultat);
rezultat.setText(raspuns_corect);
}