JUST JAVA
JAVA CODE
package com.example.android.justjava;
/** * IMPORTANT: Add your package below. Package name can be found in the project's AndroidManifest.xml file. * This is the package name our example uses: * <p>
* package com.example.android.justjava; */
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.TextView;
import java.text.NumberFormat;
/** * This app displays an order form to order coffee. */public class MainActivity extends AppCompatActivity {
int quantity = 0;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/** * This method is called when the plus button is clicked. */ public void increment(View view) {
quantity = quantity + 1;
display(quantity);
/** * This method is called when the minus button is clicked. */ }
public void decrement(View view) {
quantity = quantity - 1;
display(quantity);
}
public void submitOrder(View view) {
display(quantity);
displayPrice(quantity * 5);
}
/** * This method displays the given price on the screen. */ private void displayPrice(int number) {
TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}
/** * This method displays the given quantity value on the screen. */ private void display(int number) {
TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
quantityTextView.setText("" + number);
}
}
XML CODE
<?xml version="2.0" 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"
tools:context=".MainActivity">
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="16dp" android:text="quantity" android:textAllCaps="true"/>
<Button android:id="@+id/button3" android:layout_width="48dp" android:layout_height="48dp" android:onClick="increment" android:layout_marginBottom="16dp" android:layout_marginLeft="16dp" android:text="+" />
<TextView android:id="@+id/quantity_text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="16dp" android:layout_marginLeft="16dp" android:text="0" android:textColor="#000000" android:textSize="16sp"/>
<Button android:id="@+id/button4" android:layout_width="48dp" android:layout_height="48dp" android:onClick="decrement" android:layout_marginLeft="16dp" android:text="-" />
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="16dp" android:layout_marginTop="16dp" android:text="price" android:textAllCaps="true"/>
<TextView android:id="@+id/price_text_view" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="16dp" android:layout_marginTop="16dp" android:text="$0" android:textColor="#000000" android:textSize="16sp"/>
<Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="16dp" android:layout_marginTop="16dp" android:onClick="submitOrder" android:text="order" android:textAllCaps="true"/>
</LinearLayout>
