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ListFragment.java
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ListFragment.java
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package com.zybooks.inventoryapp;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.navigation.Navigation;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import java.util.List;
public class ListFragment extends Fragment implements DetailFragment.ItemListener {
private ItemAdapter adapter;
// Handle edited item from DetailFragment
@Override
public void handleEdited(Item original, Item edited) {
adapter.editItem(original, edited);
}
// Handle deleted item from DetailFragment
@Override
public void handleDeleted(Item deleted) {
adapter.deleteItem(deleted);
}
public ListFragment() {DetailFragment.register(this);}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_list, container, false);
// Click listener for the RecyclerView
View.OnClickListener onClickListener = itemView -> {
// Create fragment arguments containing the selected item ID
int selectedItemId = (int) itemView.getTag();
Bundle args = new Bundle();
args.putInt(DetailFragment.ARG_ITEM_ID, selectedItemId);
// Replace list with details
Navigation.findNavController(itemView).navigate(R.id.show_item_detail, args);
};
// Send bands to RecyclerView
RecyclerView recyclerView = view.findViewById(R.id.item_list);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
List<Item> items = Inventory.getInstance(requireContext())
.getItems(AuthenticatedUserManager.getInstance().getUser());
adapter = new ItemAdapter(items, onClickListener);
recyclerView.setAdapter(adapter);
FloatingActionButton fab = view.findViewById(R.id.floating_action_button);
// Bring up dialog to add item, if item name is already in use, bring up alert message,
// otherwise add item to inventory database.
fab.setOnClickListener(l -> {
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
builder.setTitle("Add Item");
View editView = inflater.inflate(R.layout.item_input, null);
builder.setView(editView);
EditText txtName = editView.findViewById(R.id.name_entry);
EditText txtDescription = editView.findViewById(R.id.desc_entry);
EditText txtQty = editView.findViewById(R.id.qty_entry);
builder.setPositiveButton("OK", (dialogInterface, i) -> {
String name = txtName.getText().toString();
String description = txtDescription.getText().toString();
String quantity = txtQty.getText().toString();
Item item = new Item(name, description, quantity);
AuthenticatedUser authUser = AuthenticatedUserManager.getInstance().getUser();
int result = Inventory.getInstance(getContext()).addItem(item, authUser);
if (result == -1) {
Toast.makeText(getContext(), "Item already exists", Toast.LENGTH_SHORT).show();
} else {
adapter.addItem(new Item(result, item));
}
});
builder.setNegativeButton("Cancel", null);
builder.create();
builder.show();
});
return view;
}
private class ItemAdapter extends RecyclerView.Adapter<ItemHolder> {
private final List<Item> mItems;
private final View.OnClickListener mOnClickListener;
public ItemAdapter(List<Item> items, View.OnClickListener onClickListener) {
mItems = items;
mOnClickListener = onClickListener;
}
@NonNull
@Override
public ItemHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
return new ItemHolder(layoutInflater, parent);
}
@Override
public void onBindViewHolder(ItemHolder holder, int position) {
Item item = mItems.get(position);
holder.bind(item);
holder.itemView.setTag(item.getId());
holder.itemView.setOnClickListener(mOnClickListener);
}
@Override
public int getItemCount() {
return mItems.size();
}
// Add item to recycler view
public void addItem(Item item) {
mItems.add(item);
notifyItemInserted(mItems.size() - 1);
}
// Edit item in recycler view
public void editItem(Item original, Item edited) {
int index = mItems.indexOf(original);
if (index == -1) {
return;
}
mItems.add(index, edited);
mItems.remove(original);
notifyItemChanged(index);
}
// Delete item from recycler view
public void deleteItem(Item item) {
int index = mItems.indexOf(item);
mItems.remove(item);
notifyItemRemoved(index);
}
}
private static class ItemHolder extends RecyclerView.ViewHolder {
private final TextView mNameTextView;
private final TextView mQtyTextView;
public ItemHolder(LayoutInflater inflater, ViewGroup parent) {
super(inflater.inflate(R.layout.list_item, parent, false));
mNameTextView = itemView.findViewById(R.id.item_name);
mQtyTextView = itemView.findViewById(R.id.item_quantity);
}
public void bind(Item item) {
mNameTextView.setText(item.getName());
mQtyTextView.setText(item.getQuantity());
}
}
}