android_bekup_sample_5

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context="com.arifsetyawan.myapplication.MainActivity">

    <!--<ListView
        android:id="@+id/list"
        android:layout_height="match_parent"
        android:layout_width="wrap_content">
    </ListView>-->

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/counter_title"
        android:text="Quantity"
        android:textAllCaps="true"
        android:layout_marginBottom="16dp"
        android:textSize="16sp" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/quantity_text_view"
        android:layout_margin="0dp"
        android:text="0" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/counter_title"
        android:text="Price"
        android:textAllCaps="true"
        android:layout_marginBottom="16dp"
        android:layout_marginTop="16dp"
        android:textSize="16sp" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/price_text_view"
        android:text="$0" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingTop="16dp"
        android:paddingBottom="16dp"
        >

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="+"
            android:onClick="increaseItem"
            android:layout_weight="1"
            />

        <Button
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="-"
            android:onClick="decreaseItem"
            android:layout_weight="1"
            />

    </LinearLayout>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Order"
        android:onClick="orderItem"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/order_text_view"
        android:text="" />


</LinearLayout>

MainActivity.java

package com.arifsetyawan.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

import java.text.NumberFormat;
import java.util.Currency;
import java.util.Locale;

/**
 * This app displays an order form to order coffee.
 */
public class MainActivity extends Activity {

    ListView listView;

    protected double itemPrice = 30;
    protected int qty = 0;
    protected double totalPrice = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
/*
        // Get ListView object from xml
        listView = (ListView) findViewById(R.id.list);

        // Defined Array values to show in ListView
        String[] values = new String[] { "Android List View",
                "Adapter implementation",
                "Simple List View In Android",
                "Create List View Android",
                "Android Example",
                "List View Source Code",
                "List View Array Adapter",
                "Android Example List View"
        };

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, android.R.id.text1, values);

        // Assign adapter to ListView
        listView.setAdapter(adapter);

        // ListView Item Click Listener
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                // ListView Clicked item index
                int itemPosition     = position;

                // ListView Clicked item value
                String  itemValue    = (String) listView.getItemAtPosition(position);

                // Show Alert
                Toast.makeText(getApplicationContext(),
                        "Position :"+itemPosition+"  ListItem : " +itemValue , Toast.LENGTH_LONG)
                        .show();

            }

        });*/

    }

    /**
     * Menambah jumlah barang
     * @param view
     */
    public void increaseItem(View view) {
        display(1);
    }

    /**
     * Mengurangi jumlah barang
     * @param view
     */
    public void decreaseItem(View view){
        display(-1);
    }

    /**
     * Aksi untuk button Order
     */
    public void orderItem(View view){
        TextView orderTextView = (TextView) findViewById(R.id.order_text_view);
        orderTextView.setText("Konfirmasi : anda telah order "+qty+" item dengan harga "+totalPrice);
    }

    /**
     * This method displays the given quantity value on the screen.
     */
    private void display(int number) {
        // Ambil object TextView quantity_text_view
        TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);

        // Ambil object TextView price_text_view
        TextView priceTextView = (TextView) findViewById(R.id.price_text_view);

        // Parsing quantity dari String ke Integer agar dapat masuk ke operasi matematika
        int existing = Integer.parseInt(String.valueOf(quantityTextView.getText()));

        // Menambahkan value number pada existing value di quantity_text_view
        number = number+existing;
        qty = number;

        // Proteksi non-negative value
        if(number < 1) number = 0;

        // Kalkulasi Harga
        double price = number * itemPrice;
        totalPrice = price;

        // Set Display ke object quantityTextView
        quantityTextView.setText("" + number);

        // Set DIsplay ke object priceTextView
        priceTextView.setText("" + NumberFormat.getCurrencyInstance().format(price));
    }



}