Tuesday, 2 July 2013

Android spinner (drop down list) example

// siddhu vydyabhushana // 17 comments
In Android, you can use “android.widget.Spinner” class to render a dropdown box selection list.
Note
Spinner is a widget similar to a drop-down list for selecting items.
In this tutorial, we show you how to do the following tasks :
  1. Render a Spinner in XML, and load the selection items via XML file also.
  2. Render another Spinner in XML, and load the selection items via code dynamically.
  3. Attach a listener on Spinner, fire when user select a value in Spinner.
  4. Render and attach a listener on a normal button, fire when user click on it, and it will display selected value of Spinner.
P.S This project is developed in Eclipse 3.7, and tested with Android 2.3.3.

1. List of Items in Spinner

Open “res/values/strings.xml” file, define the list of items that will display in Spinner (dropdown list).
File : res/values/strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
 
    <string name="app_name">MyAndroidApp</string>
    <string name="country_prompt">Choose a country</string>
 
    <string-array name="country_arrays">
        <item>Malaysia</item>
        <item>United States</item>
        <item>Indonesia</item>
        <item>France</item>
        <item>Italy</item>
        <item>Singapore</item>
        <item>New Zealand</item>
        <item>India</item>
    </string-array>
 
</resources>

2. Spinner (DropDown List)

Open “res/layout/main.xml” file, add two spinner components and a button.
  1. In “spinner1″, the “android:entries” represents the selection items in spinner.
  2. In “spinner2″, the selection items will be defined in code later.
File : res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/country_arrays"
        android:prompt="@string/country_prompt" />
 
    <Spinner
        android:id="@+id/spinner2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
    <Button
        android:id="@+id/btnSubmit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Submit" />
 
</LinearLayout>

3. Code Code

Read the code and also code’s comment, it should be self-explanatory.
File : MyAndroidAppActivity.java
package com.mkyong.android;
 
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;
 
public class MyAndroidAppActivity extends Activity {
 
  private Spinner spinner1, spinner2;
  private Button btnSubmit;
 
  @Override
  public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);
 
	addItemsOnSpinner2();
	addListenerOnButton();
	addListenerOnSpinnerItemSelection();
  }
 
  // add items into spinner dynamically
  public void addItemsOnSpinner2() {
 
	spinner2 = (Spinner) findViewById(R.id.spinner2);
	List<String> list = new ArrayList<String>();
	list.add("list 1");
	list.add("list 2");
	list.add("list 3");
	ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
		android.R.layout.simple_spinner_item, list);
	dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
	spinner2.setAdapter(dataAdapter);
  }
 
  public void addListenerOnSpinnerItemSelection() {
	spinner1 = (Spinner) findViewById(R.id.spinner1);
	spinner1.setOnItemSelectedListener(new CustomOnItemSelectedListener());
  }
 
  // get the selected dropdown list value
  public void addListenerOnButton() {
 
	spinner1 = (Spinner) findViewById(R.id.spinner1);
	spinner2 = (Spinner) findViewById(R.id.spinner2);
	btnSubmit = (Button) findViewById(R.id.btnSubmit);
 
	btnSubmit.setOnClickListener(new OnClickListener() {
 
	  @Override
	  public void onClick(View v) {
 
	    Toast.makeText(MyAndroidAppActivity.this,
		"OnClickListener : " + 
                "\nSpinner 1 : "+ String.valueOf(spinner1.getSelectedItem()) + 
                "\nSpinner 2 : "+ String.valueOf(spinner2.getSelectedItem()),
			Toast.LENGTH_SHORT).show();
	  }
 
	});
  }
}
File : CustomOnItemSelectedListener.java
package com.mkyong.android;
 
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Toast;
 
public class CustomOnItemSelectedListener implements OnItemSelectedListener {
 
  public void onItemSelected(AdapterView<?> parent, View view, int pos,long id) {
	Toast.makeText(parent.getContext(), 
		"OnItemSelectedListener : " + parent.getItemAtPosition(pos).toString(),
		Toast.LENGTH_SHORT).show();
  }
 
  @Override
  public void onNothingSelected(AdapterView<?> arg0) {
	// TODO Auto-generated method stub
  }
 
}

4. Demo

Run the application.
1. Result, two spinners are displayed :
android spinner demo1
android spinner demo2
2. Select “France” from spinner1, item selection listener is fired :
android spinner demo3
3. Select “list2″ from spinner2, and click on the submit button :
android spinner demo4

Download Source Code

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