School, Shoping list, 14.10.2017

Item.java
---------
package com.example.mohamadpc.listviewshopping;

/**
 * Created by MOHAMADPC on 10/10/2017.
 */

public class Item {
    private String name;
    private int quentity;


    public Item(String name, int quentity) {
        this.name = name;
        this.quentity = quentity;
    }

    public Item(String name) {
        this.name = name;
        this.quentity = 1;
    }

    public int getQuentity() {
        return quentity;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setQuentity(int quentity) {
        this.quentity = quentity;
    }

}


ItemAdapter.java
----------------
package com.example.mohamadpc.listviewshopping;


import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.List;

import static android.icu.lang.UCharacter.GraphemeClusterBreak.V;

/**
 * Created by MOHAMADPC on 10/10/2017.
 */

public class ItemAdapter extends BaseAdapter {
    private Context context;
    private List<Item> itemsList;

    public ItemAdapter(List<Item> itemsList, Context context) {
        this.itemsList = itemsList;
        this.context = context;
    }

    @Override
    public int getCount() {
        return this.itemsList.size();
    }

    @Override
    public Object getItem(int position) {
        return itemsList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View myView = LayoutInflater.from(context).inflate(R.layout.list_row_layout, null);
        Item item = itemsList.get(position);
        ((TextView) myView.findViewById(R.id.tvItemName)).setText(item.getName());
        ((TextView) myView.findViewById(R.id.tvQuentity)).setText(item.getQuentity() + "");
        return myView;
    }
}

MainActivity.java
-----------------
package com.example.mohamadpc.listviewshopping;

import android.app.AlertDialog;
import android.content.ClipData;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import static android.os.Build.VERSION_CODES.M;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private EditText etNewItem;
    private Button btnAddItem;
    private ListView lsvItems;
    List<Item> lst;
    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        connectToLayout();
    }

    private void connectToLayout() {
        this.context = this;
        etNewItem = (EditText) findViewById(R.id.etNewItem);
        btnAddItem = (Button) findViewById(R.id.btnAddItem);
        lsvItems = (ListView) findViewById(R.id.lsvItems);
        btnAddItem.setOnClickListener(this);

        lst = loadFromFile();
        ItemAdapter myAdapter = new ItemAdapter(lst, this);
        lsvItems.setAdapter(myAdapter);

        lsvItems.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
                final AlertDialog.Builder myDialog = new AlertDialog.Builder(context);
                final View myView = LayoutInflater.from(context).inflate(R.layout.update_dialog, null);
                myDialog.setView(myView);
                myDialog.setTitle("Update Quentity");
                myDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String inputData = ((EditText) myView.findViewById(R.id.etNewQuentity)).getText().toString();
                        if (!inputData.isEmpty()) {
                            int newQ = Integer.parseInt(inputData);
                            String itemName = lst.get(position).getName();

                            // save to file
                            SharedPreferences myfile = context.getSharedPreferences("MyShoppingList", Context.MODE_PRIVATE);
                            if (newQ > 0) {
                                myfile.edit().putInt(itemName, newQ).commit();
                            } else {
                                myfile.edit().remove(itemName).commit();
                            }

                            // update list
                            lst = loadFromFile();
                            lsvItems.setAdapter(new ItemAdapter(lst, context));
                            dialog.cancel();
                        }
                    }
                });

                myDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });
                myDialog.show();
                return true;
            }
        });
    }

    private List<Item> loadFromFile() {
        SharedPreferences myfile = this.getSharedPreferences("MyShoppingList", Context.MODE_PRIVATE);
        Object[] keys = myfile.getAll().keySet().toArray();

        List<Item> lst = new ArrayList<>();
        for (int i = 0; i < keys.length; i += 1) {
            String name = (String) keys[i];
            lst.add(new Item(name, myfile.getInt(name, 0)));
        }
        return lst;
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btnAddItem:
                String newItemName = etNewItem.getText().toString();
                if (!newItemName.isEmpty()) {
                    // add the item
                    SharedPreferences myfile = this.getSharedPreferences("MyShoppingList", Context.MODE_PRIVATE);

                    int oldQ = myfile.getInt(newItemName, -1);
                    if (oldQ == -1) {
                        myfile.edit().putInt(newItemName, 1).commit();
                    } else {
                        myfile.edit().putInt(newItemName, oldQ + 1).commit();
                    }

                    // update the list
                    lst = loadFromFile();
                    lsvItems.setAdapter(new ItemAdapter(lst, this));

                    etNewItem.setText("");
                }
                break;
            default:
                Toast.makeText(this, "Error handling a click event", Toast.LENGTH_LONG).show();
                break;
        }
    }
}

activity_main.xml
-----------------
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/etNewItem"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textSize="20sp" />

        <Button
            android:id="@+id/btnAddItem"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:text="Add"
            android:textSize="20sp" />
    </LinearLayout>

    <ListView
        android:id="@+id/lsvItems"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:choiceMode="singleChoice"></ListView>
</LinearLayout>

list_row_layout.xml
-------------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/tvItemName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="18sp" />

    <TextView
        android:id="@+id/tvQuentity"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textSize="18sp" />

</LinearLayout>

update_dialog.xml
-----------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <EditText
        android:id="@+id/etNewQuentity"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter quentity ..."
        android:inputType="number"
        android:textSize="20sp" />

</LinearLayout>