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  1. /**
  2.  * IMPORTANT: Make sure you are using the correct package name.
  3.  * This example uses the package name:
  4.  * package com.example.android.justjava
  5.  * If you get an error when copying this code into Android studio, update it to match the package name found
  6.  * in the project's AndroidManifest.xml file.
  7.  **/
  8.  
  9.  package com.example.android.justjava;
  10.  
  11.  
  12.  
  13. import android.os.Bundle;
  14. import android.support.v7.app.AppCompatActivity;
  15. import android.view.View;
  16. import android.widget.TextView;
  17.  
  18. /**
  19.  * This app displays an order form to order coffee.
  20.  */
  21. public class MainActivity extends AppCompatActivity {
  22.  
  23.     @Override
  24.     protected void onCreate(Bundle savedInstanceState) {
  25.         super.onCreate(savedInstanceState);
  26.         setContentView(R.layout.activity_main);
  27.     }
  28.  
  29.     /**
  30.      * This method is called when the order button is clicked.
  31.      */
  32.     public void submitOrder(View view) {
  33.         display(1);
  34.     }
  35.  
  36.     /**
  37.      * This method displays the given quantity value on the screen.
  38.      */
  39.     private void display(int number) {
  40.         TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
  41.         quantityTextView.setText("" + number);
  42.     }
  43. }
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