How to update edittext whenever a quantity is added in android studio-CodePudding

The

What do I want to do?

I want to update my Total Qty and Order Value in such a way that whenever the user enters the quantity both edittexts should be updated. For example, in the above image, I searched for one product, its rate is 287.30 and when I entered the quantity 5 then Total Qty: 5 and Order Value: 287.30. After that, I select another product and enter its quantity 8 then both edit text should be updated like Total Qty: 13 and Order Value: 509.15, and when I remove any product then it should subtract the total quantity and order value.

The Total Qty: and Order Value: is in my main fragment. Below is my code

Fragment Layout

<LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:orientation="vertical"> <android.support.v7.widget.RecyclerView android:id="@ id/products" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:focusable="true" /> </LinearLayout> <LinearLayout android:id="@ id/product_info" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10sp" android:orientation="horizontal" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@ id/tv_product"> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight=".5" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Total Qty:" /> <EditText android:id="@ id/total_qty" android:layout_width="match_parent" android:layout_height="wrap_content" android:editable="false" android:focusable="false" android:focusableInTouchMode="false" android:gravity="center_horizontal" android:hint="" android:inputType="number" /> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight=".5" android:orientation="horizontal"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Order Value :" /> <EditText android:id="@ id/order_value" android:layout_width="match_parent" android:layout_height="wrap_content" android:editable="false" android:focusable="false" android:focusableInTouchMode="false" android:gravity="center_horizontal" android:hint="" android:inputType="none" /> </LinearLayout> </LinearLayout>

Fragment Code

// created getter setters public EditText totalQty,totalOrder; public EditText getTotalQty(){ return totalQty; } public void setTotalQty(EditText et){ this.totalQty = et; } public EditText getTotalOrder(){return totalOrder;} public void setTotalOrder(EditText ett){this.totalOrder=ett;} addProduct.setOnClickListener(v -> { mProducts.add(new ProductDetail()); mProductsAdapter.setProducts(mProducts); productsRecyclerView.smoothScrollToPosition(mProducts.size() - 1); });

Product Layout

<AutoCompleteTextView android:id="@ id/tv_product" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10sp" android:gravity="start" android:hint="Enter Product" android:inputType="text" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <LinearLayout android:id="@ id/product_info" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="10sp" android:orientation="horizontal" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@ id/tv_product"> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight=".5" android:orientation="vertical"> <EditText android:id="@ id/prod_qty" android:layout_width="match_parent" android:layout_height="wrap_content" android:editable="false" android:focusable="true" android:focusableInTouchMode="true" android:gravity="left" android:hint="Enter Quantity" android:inputType="number" /> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight=".5" android:orientation="vertical"> <EditText android:id="@ id/prod_price" android:layout_width="match_parent" android:layout_height="wrap_content" android:editable="false" android:focusable="false" android:focusableInTouchMode="false" android:gravity="left" android:hint="Prod Price" android:inputType="numberDecimal" /> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight=".5" android:orientation="vertical"> <EditText android:id="@ id/prod_specs" android:layout_width="match_parent" android:layout_height="wrap_content" android:editable="false" android:focusable="false" android:focusableInTouchMode="false" android:gravity="left" android:hint="Prod Specs" android:inputType="none" /> </LinearLayout> </LinearLayout> <Button android:id="@ id/btn_rmv" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="1dp" android:layout_marginBottom="1dp" android:text="Remove Product" android:textColor="@color/white" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@ id/product_infos" />

Product Adapter

View productView = inflater.inflate(R.layout.product_layout, parent, false); ProductViewHolder viewHolder = new ProductViewHolder(productView); viewHolder.tvProduct.setAdapter(prodAdapter); viewHolder.tvProduct.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { mProductManager = new ProductManager(context); int position = viewHolder.getAdapterPosition(); if (position != -1) { ProductDetail productDetail = mProductManager.getProductByPrdName(s.toString()); mProducts.get(position).setProductNameFull(s.toString()); viewHolder.price.setText(productDetail.getPrice()); viewHolder.spec.setText(productDetail.getProductSpec()); viewHolder.pgrp.setText(productDetail.getProductGroup()); viewHolder.ccode.setText(productDetail.getCompanyCode()); viewHolder.cname.setText(productDetail.getCompanyName()); viewHolder.pcode.setText(productDetail.getProductCode()); } } }); viewHolder.quantity.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { } @Override public void afterTextChanged(Editable s) { int position = viewHolder.getAdapterPosition(); if (position != -1) { Integer val = null; try { val = Integer.valueOf(s.toString()); } catch (Exception e) { } mProducts.get(position).setQuantity(val); } } }); viewHolder.removeBtn.setOnClickListener(v -> { int position = viewHolder.getAdapterPosition(); if (position != -1) { mProducts.remove(position); notifyItemRemoved(position); } }); return viewHolder;

How can I add and then update the values?

Any help would be highly appreciated.

CodePudding user response：

I will disappoint you by not sharing code. I will share you a simple graphic of what you need to do.

[Fragment]: displays your list of orders. When an event is triggered (user tapped something or changed something), forwards this event to a ViewModel. Also Observes for the ViewModel data state.

[ViewModel]: exposes a series of functions to listen for user events (e.g. the user tapped this order, or the user changed the quantity of this order to NN, etc.). Also offers a LiveData (or Flow) with the State and Data your Fragment needs. Maybe even talks to the repository where this data originates from (where you save your Orders in your persistent or backend).

Interactions:

When the UI modified something, you tell the viewModel: "This data changed, the order X, now has a quantity of Y". The ViewModel will process this, update the State of the screen, and send the new data via your Livedata/Flow that the Fragment observes. When the Fragment receives this new data, it will update the UI accordingly, as that's its most important job.

This whole thing has been greatly documented in the official Android recommended architecture guides. I suggest you start from there instead of trying to fight the framework and making your life more complicated.

CodePudding user response：

implement interface between adapter and fragment like this (it is just sodu to tell how you have to implement things also you have to check it out how to implement interfaces

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public frgment extends Fragment implements GetValueInterface{ in onCreate function{ int totalquantity; call this after adapter initialization adapter.registergetValueInterface(this) } @Override Void setQuantity(Int _gotquantity){ _gotquantity =_gotquantity; totalquantityedittext.setText(_gotquantity,TextView.BufferType.EDITABLE) } }

and in adapter class

Adapter class { public GetValueInterface instance; function registergetValueInterface(GetValueInterface obj){ instance=obj; } //and in quantity edittext text watcher call instance.setQuantity(quanity) }

like this you can minus the quantity as well on removal of item

CodePudding user response：

Actually it's releated with Interactions like LiveData.

But rather than write a looot of code, simply I'm passing runnable to childs for call it when somethink changed :)

For example:

class Root{ ... public void addItem(){ ItemController cont = new ItemController(() -> updateSums()); ... } public void updateSums(){ //TODO } } class ItemController{ Runnable updater; public ItemController(Runnable updater){ this.updater = updater; } public void onSomethingChanged(){ updater.run(); } }