Expandablelistview: Get Input Values From Childs

I'm parsing a JSON into a ExpandableListView, on each child the user can select the amount of each child he wants to have due +/- Buttons. The +/- Buttons are connected to a TextVi

Solution 1:

Add a new class SelectedDrink like this:

publicclassSelectedDrink{
String content;
int qty;
}

Then try this adapter code:

publicclassExpandableListAdapterDrinksextendsBaseExpandableListAdapter {

private Context context;
private List<Drink> drinksList;

private Button btReset, btOk;
private List<Integer> groupSum;
private List<List<Integer>> qty;
privateinttotalSum=0;

classViewHolder {
    TextView childText,counterText, childUnitPrice, childFinalPrice;
    Button btn_plus,btn_minus;
}

classPos{
    int group;
    int child;
    Pos(int group, int child){
        this.group = group;
        this.child = child;
    }
}

publicExpandableListAdapterDrinks(Context context, List<Drink> drinksList,
                                   Button btReset, Button btOk) {
    this.context = context;
    this.drinksList= drinksList;
    this.btReset = btReset;
    this.btOk = btOk;

    groupSum = newArrayList<>();
    qty = newArrayList<>();
    for(int i=0; i<drinksList.size(); i++) {
        groupSum.add(0);
        List<Integer> orderedQty = newArrayList<>();
        for(int j=0; j<drinksList.get(i).getContent().size(); j++) orderedQty.add(0);
        qty.add(orderedQty);
    }
}

privatevoidresetGroupSum(int groupPosition) {
    totalSum -= groupSum.get(groupPosition);
    groupSum.set(groupPosition, 0);
    resetGroupChildrenQty(groupPosition);
}

privatevoidresetGroupChildrenQty(int groupPosition) {
    for(int i=0; i<qty.get(groupPosition).size(); i++) qty.get(groupPosition).set(i, 0);
}

@OverridepublicintgetGroupCount() {
    return drinksList.size();
}

@OverridepublicintgetChildrenCount(int groupPosition) {
    return drinksList.get(groupPosition).getContent().size();
}

@Overridepublic Drink getGroup(int groupPosition) {
    return drinksList.get(groupPosition);
}

@Overridepublic String getChild(int groupPosition, int childPosition) {
    return drinksList.get(groupPosition).getContent().get(childPosition);
}

@OverridepubliclonggetGroupId(int groupPosition) {
    return groupPosition;
}

@OverridepubliclonggetChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@OverridepublicbooleanhasStableIds() {
    returnfalse;
}

@Overridepublic View getGroupView(int groupPosition, boolean isExpanded, View view, ViewGroup parent) {
    StringheaderTitle= drinksList.get(groupPosition).getTitle();

    /** HEADER TEXT HERE */if(view==null) {
        LayoutInflaterinflater= (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.vip_package_listgroup,null);
    }
    LinearLayoutbgcolor= view.findViewById(R.id.lblListHeaderLayout);
    TextViewlblListHeader= (TextView)view.findViewById(R.id.lblListHeader);
    TextViewlblListHeaderPrice= (TextView)view.findViewById(R.id.lblListHeader_Price);
    ButtonlblListHeaderButton= view.findViewById(R.id.lblListHeaderButton);

    if(groupSum.get(groupPosition) > 0){
        lblListHeaderPrice.setVisibility(View.VISIBLE);
        lblListHeaderPrice.setText(String.format("%.02f", (float)groupSum.get(groupPosition)).replace(".", ",") + "€");
    }else{
        lblListHeaderPrice.setVisibility(View.GONE);
        lblListHeaderButton.setVisibility(View.GONE);
    }

    if(!drinksList.get(groupPosition).getBg().get(0).isEmpty() || !drinksList.get(groupPosition).getBg().get(1).isEmpty() ) {
        List<String> colorGradientTopBottom = drinksList.get(groupPosition).getBg();
        int[] colors = {Color.parseColor(colorGradientTopBottom.get(0)),Color.parseColor(colorGradientTopBottom.get(1))};
        GradientDrawablegd=newGradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, colors);
        gd.setCornerRadius(0f);
        bgcolor.setBackground(gd);
    } else {
        //bgcolor.setBackgroundColor(ContextCompat.getColor(context, R.color.cardview_bg));
    }
    lblListHeader.setText(headerTitle);

    return view;
}

@Overridepublic View getChildView(int groupPosition, int childPosition, boolean isLastChild, View view, ViewGroup parent) {

    /** Drinks List */
    ViewHolder viewHolder;

    StringchildDrink= getChild(groupPosition, childPosition);
    intchildPrice= getGroup(groupPosition).getPricelist().get(childPosition);

    if (view == null) {
        LayoutInflaterinflater= (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.vip_drinks_listitem, null);

        viewHolder = newViewHolder();
        viewHolder.childText = view.findViewById(R.id.lblListItemDrinks);
        viewHolder.childUnitPrice = view.findViewById(R.id.lblListItemDrinksUnitPrice);
        viewHolder.counterText = view.findViewById(R.id.vip_drinks_amount);
        viewHolder.childFinalPrice = view.findViewById(R.id.lblListItemDrinksFinalPrice);
        viewHolder.btn_plus = view.findViewById(R.id.vip_drinks_btn_plus);
        viewHolder.btn_minus = view.findViewById(R.id.vip_drinks_btn_minus);

        viewHolder.btn_plus.setOnClickListener(newView.OnClickListener() {
            @OverridepublicvoidonClick(View v) {
                Pospos= (Pos) v.getTag();
                intorderedQty= qty.get(pos.group).get(pos.child);
                orderedQty++;
                qty.get((pos.group)).set(pos.child, orderedQty);
                groupSum.set(pos.group, groupSum.get(pos.group) + getGroup(pos.group).getPricelist().get(pos.child));
                notifyDataSetChanged();
                totalSum += getGroup(pos.group).getPricelist().get(pos.child);
                btOk.setText(String.format("%.02f", (float)totalSum).replace(".", ",") + "€");
                btReset.setEnabled(true);
            }
        });

        viewHolder.btn_minus.setOnClickListener(newView.OnClickListener() {
            @OverridepublicvoidonClick(View v) {
                Pospos= (Pos) v.getTag();
                intorderedQty= qty.get(pos.group).get(pos.child);
                if (orderedQty > 0) {
                    orderedQty--;
                    qty.get((pos.group)).set(pos.child, orderedQty);
                    groupSum.set(pos.group, groupSum.get(pos.group) - getGroup(pos.group).getPricelist().get(pos.child));
                    notifyDataSetChanged();
                    totalSum -= getGroup(pos.group).getPricelist().get(pos.child);
                    if (totalSum == 0) resetTotalSum();
                    else btOk.setText(String.format("%.02f", (float)totalSum).replace(".", ",") + "€");
                }
            }
        });
    } else {
        viewHolder = (ViewHolder) view.getTag();
    }

    viewHolder.childText.setText(childDrink);
    viewHolder.childUnitPrice.setText(String.format("%.02f", (float)childPrice).replace(".", ",") + "€");
    intorderedQty= qty.get(groupPosition).get(childPosition);
    viewHolder.counterText.setText(String.valueOf(orderedQty));
    viewHolder.childFinalPrice.setText(String.format("%.02f", (float)orderedQty*childPrice).replace(".", ",") + "€");

    viewHolder.btn_minus.setTag(newPos(groupPosition, childPosition));
    viewHolder.btn_plus.setTag(newPos(groupPosition, childPosition));
    view.setTag(viewHolder);
    return view;
}

@OverridepublicbooleanisChildSelectable(int i, int i1) {
    returnfalse;
}

publicvoidresetTotalSum() {
    for(int i=0; i<drinksList.size(); i++) {
        resetGroupSum(i);
    }
    notifyDataSetChanged();
    btReset.setEnabled(false);
    btOk.setText(String.valueOf(0));
}

public ArrayList<SelectedDrink> getOrderList() {
    ArrayList<SelectedDrink> orderList = newArrayList<>();
    for(int i=0; i<drinksList.size(); i++) {
        for(int j=0; j<drinksList.get(i).getContent().size(); j++) {
            if(qty.get(i).get(j) > 0) {
                SelectedDrinkselectedDrink=newSelectedDrink();
                selectedDrink.content = getGroup(i).getContent().get(j);
                selectedDrink.qty = qty.get(i).get(j);
                orderList.add(selectedDrink);
            }
        }
    }
    return orderList;
}
}

I test the above with this activity:

publicclassMainActivityextendsAppCompatActivity {
finalprivatestaticintNUM_OF_GROUP=5;
List<Drink> drinksList;
ExpandableListView listView;
ExpandableListAdapterDrinks expandableListAdapterDrinks;

@OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButtonbtRest= findViewById(R.id.btReset);
    ButtonbtOk= findViewById(R.id.btOK);
    listView = findViewById(R.id.elvDrinks);

    initDataList();
    expandableListAdapterDrinks =
            newExpandableListAdapterDrinks(getApplicationContext(), drinksList, btRest, btOk);
    listView.setAdapter(expandableListAdapterDrinks);
    listView.expandGroup(0);

    btRest.setOnClickListener(newView.OnClickListener() {
        @OverridepublicvoidonClick(View view) {
            expandableListAdapterDrinks.resetTotalSum();
            for(int i=0; i<drinksList.size(); i++) listView.collapseGroup(i);
            listView.expandGroup(0);
        }
    });
    btOk.setOnClickListener(newView.OnClickListener() {
        @OverridepublicvoidonClick(View view) {
            Stringmsg="Nothing Selected";
            Buttonbutton= (Button)view;
            if(!button.getText().equals("0")) {
                msg = "Upload!\n";
                ArrayList<SelectedDrink> selectedDrinks = expandableListAdapterDrinks.getOrderList();
                for(SelectedDrink selectedDrink: selectedDrinks) {
                    msg += selectedDrink.content + "    " + selectedDrink.qty + "\n";
                }
                msg += "Total: " + button.getText();
            }
            Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();
        }
    });
}

privatevoidinitDataList(){
    drinksList = newArrayList<>();
    List<String> content;
    List<Integer> pricelist;
    List<String> bg;
    for(int i=1; i<=NUM_OF_GROUP; i++) {
        content = newArrayList<>();
        pricelist = newArrayList<>();
        bg = newArrayList<>();
        for(intj=1; j<(NUM_OF_GROUP + newRandom().nextInt(5)); j++){
            content.add("Drink " + i + "-" + j);
            pricelist.add(newRandom().nextInt(1000));
            bg.add("#008577");
            bg.add("#D81B60");
        }
        Drinkdrink=newDrink();
        drink.setTitle("Group " + i);
        drink.setContent(content);
        drink.setPricelist(pricelist);
        drink.setBg(bg);
        drinksList.add(drink);
    }
}
}

and this layout:

<?xml version="1.0" encoding="utf-8"?><RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><LinearLayoutandroid:id="@+id/llBtns"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:orientation="horizontal"><Buttonandroid:id="@+id/btReset"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_weight="1"android:enabled="false"android:text="Reset" /><Buttonandroid:id="@+id/btOK"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_weight="0.5"android:text="0" /></LinearLayout><ExpandableListViewandroid:id="@+id/elvDrinks"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_above="@id/llBtns"></ExpandableListView></RelativeLayout>

Also, your Drink class, vip_package_listgroup.xml and vip_drinks_listitem.xml are also needed. Hope that helps!