“I need” + “2 cups of coffee” + “on Monday”
package com.example.android.justjava;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.TextView;
import java.text.NumberFormat;
public class MainActivity extends ActionBarActivity {
int quantity = 2;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void increment(View view){
quantity = quantity + 1;
display(quantity);
}
public void decrement(View view){
quantity = quantity - 1;
display(quantity);
}
public void submitOrder(View view){
int price = quantity * 5;
String priceMessage = "That would be $" + price + "please.";
priceMessage = priceMessage + "\nThank you!";
displayMessage(priceMessage);
}
/**
* This method displays the given text on the screen.
*/
private void displayMessage(String message) {
TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
priceTextView.setText(message);
}
private void display(int number){
TextView quantityTextView = (TextView) findViewById(
R.id.quantity_text_view);
quantityTextView.setText("" + number);
}
private void displayPrice(int number){
TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}
}
<LinearLayout xmlns:android="http://schemas.android."
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical"
android:paddingLeft="@dimen/activity_horizontal"
android:paddingRight="@dimen/activity_horizontal"
android:paddingTop="@dimen/activity_vertical"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:text="Quantity"
android:textAllCaps="true" />
<LinearLayout
android:layout_width="mach_parent"
android:layout_height="wrapcontent"
android:orientation="horizontal">
<Button
android:layout_height="48dp"
android:layout_width="48dp"
android:text="-"
android:onClick="decrement" />
<TextView
android:id="@+id/quantity_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:text="0"
android:textSize="16sp"
adnroid:textColor="@android:color/black" />
<Button
android:layout_height="48dp"
android:layout_width="48dp"
android:text="+"
android:onClick="increment" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
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_marginTop="16dp"
android:text="$0"
android:textSize="16sp"
adnroid:textColor="@android:color/black" />
<Button
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_marginTop="16dp"
android:text="Order"
android:onClick="submitOrder" />
</LinearLayout>