HelloAndroid with Spinner

In this exercise, I add a Spinner for user to select country where he come from. I will show how to add a Spinner in main.xml, add a array.xml to embed items into Spinner, and how to handle it in HelloAndroid.java.

A view that displays one child at a time and lets the user pick among them. The items in the Spinner come from the Adapter associated with this view.

Environment:
Ubuntu 9.04
Eclipse 3.5 Galileo
Android 1.5 SDK r3

The exercise continuous from the previous article, Change UI elements by changing main.xml. The project can be downloaded here.

Modify main.xml

  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello"
  />
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Who you are?"
  />
android:id = "@+id/message_text"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />

  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="Where you come from?"
  />
  android:id = "@+id/spinner_countries"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
   android:orientation="horizontal"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:gravity="right|bottom"
  >
android:id = "@+id/ok"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="OK" />
android:id = "@+id/cancel"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Cancel" />

Download main.xml

Create a file, named array.xml in /HelloAndroid2/res/values/
array.xml

 Canada
 China
 Germany
 Japan
 Korea
 Russia
 UK
 USA

Download array.xml

Finally, modify JavaAndroid.java

package com.example.helloandroid;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;

public class HelloAndroid extends Activity {

private Spinner spinner_countries;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       Button okButton = (Button) findViewById(R.id.ok);
       okButton.setOnClickListener(okOnClickListener);
       Button cancelButton = (Button) findViewById(R.id.cancel);
       cancelButton.setOnClickListener(cancelOnClickListener);
      
       spinner_countries = (Spinner) findViewById(R.id.spinner_countries);
       ArrayAdapter adapter
             = ArrayAdapter.createFromResource(this, 
               R.array.countries, android.R.layout.simple_spinner_item);
       adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
       spinner_countries.setAdapter(adapter);       
   }
   private Button.OnClickListener okOnClickListener = new Button.OnClickListener(){
 @Override
 public void onClick(View v) {
  EditText edit_text = (EditText) findViewById(R.id.message_text);
  CharSequence edit_text_value = edit_text.getText();
  setTitle("Hello: "+edit_text_value+" from "
   +spinner_countries.getItemAtPosition((int) spinner_countries.getSelectedItemId()));
 }
   };
  
   private Button.OnClickListener cancelOnClickListener = new Button.OnClickListener(){
 @Override
 public void onClick(View v) {
  finish();
 }
   };
}

Download HelloAndroid.java

Now, you can try to run it on Emulator.

The project can be downloaded here.

Related article:
- Custom Spinner with icon