How to implement in spinner in android programming?

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Android spinners are Linear Vertical Drop Down List in Android which provide the multiple selection to the user from the drop down list. It provides multiple options from the drop down items to perform various action according to the items.

Create a new android project name SpinnerExample .

Add a spinner object to your layout as shown below in your activity_main.xml file.

<relativelayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.spinnerexample.MainActivity" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="24dp" />

</RelativeLayout>

Declare an array string in string.xml file in values.

Go to project folder(SpinnerExample) res/values/string.xml

provide name to array string through which you can refer that string. lets say you are creating an array string of colors.

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">SpinnerExample</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string-array name="colors">
        <item>REd</item>
        <item>Blue</item>
        <item>Green</item>
        <item>Yellow</item>
        <item>Violet</item>
        <item>Cyan</item>
        <item>Black</item>
        <item>Blue</item>
    </string-array>
   

</resources>

Note : This source needs to be bound with the spinner through ArrayAdapter.

Create a new xml. file in layout folder to display the contents of array. ,best way to display items in a list is in TextView form.

go to project folder(SpinnerExample)/res/layout/itemlist.xml

<?xml version="1.0" encoding="utf-8"?>
<textview xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    </TextView>
com.funwidandroid.spinnerexample

Put the following code in MainActivity.java ....

package com.funwidandroid.spinnerexample

import android.app.Activity;
import android.content.ClipData.Item;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.RelativeLayout;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity {
RelativeLayout rel;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
Spinner sp = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter<charsequence> adapter=ArrayAdapter.createFromResource(this, 
  R.array.colors, R.layout.list);
rel=(RelativeLayout) findViewById(R.id.nik);
sp.setAdapter(adapter);
sp.setOnItemSelectedListener(new OnItemSelectedListener() {

 @Override
 public void onItemSelected(AdapterView<?> parent, View view, int position,
   long id) {
  // TODO Auto-generated method stub
 // Toast.makeText(MainActivity.this, "my selected color is :" 
  //+parent.getItemIdAtPosition(position), Toast.LENGTH_SHORT).show();
  int a = (int) parent.getItemIdAtPosition(position);
  switch(a)
  {
  case 1:
   rel.setBackgroundColor(Color.GRAY);
   break;
  case 2:
   rel.setBackgroundColor(Color.CYAN);
   break;
  case 3:
   rel.setBackgroundColor(Color.BLACK);
   break;
  case 4:
   rel.setBackgroundColor(Color.YELLOW);
   break;
  case 5:
   rel.setBackgroundColor(Color.GREEN);
   break;
  case 6:
   rel.setBackgroundColor(Color.BLUE);
   break;
  case 0:
   rel.setBackgroundColor(Color.RED);
   break;
   
  }
  
  
 }

 @Override
 public void onNothingSelected(AdapterView<?> arg0) {
  // TODO Auto-generated method stub
  
 }
});
 }

}

Result :

Download Source code : SpinnerExample.rar

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Nitendra Thakur

How to implement in spinner in android programming?

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