How to Set Spinner in Android

Spinner

Spinners provide a quick way to select one value from a set. In the default state, a spinner shows its currently selected value.

Procedure

1. Start the Eclipse IDE.
2. Create a new project.
3. Create a MainActivity.java file.
4. Create an activity_main.xml for layout design.
5. Declare a spinner in XML layout, for example:
   
   <Spinner
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/ss"/>
   
   
6. Declare a string array with some elements and pass these elements to the ArrayAdapter.
   
   For instance:
   
   String[] str={"select","yellow","red","Green","purple","blue"};
   ArrayAdapter<String> adap=new ArrayAdapter<String>
   (this, android.R.layout.simple_spinner_item,str);

The code is given below.

MainActivity.java

package com.example.spinnertodayy;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

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.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

Spinner s1;

RelativeLayout ll;

String[] str={"select","yellow","red","Green","purple","blue"};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

s1=(Spinner) findViewById(R.id.ss);

ll=(RelativeLayout) findViewById(R.id.rr);

ArrayAdapter<String> adap=new ArrayAdapter<String>

(this, android.R.layout.simple_spinner_item,str);

s1.setAdapter(adap);

s1.setOnItemSelectedListener(new OnItemSelectedListener() {

public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

// TODO Auto-generated method stub

String ss1=arg0.getItemAtPosition(arg2).toString();

String ss=((TextView)arg1).getText().toString();

Toast.makeText(getApplicationContext(), ss, 10000).show();

}

public void onNothingSelected(AdapterView<?> arg0) {

// TODO Auto-generated method stub

}

});

}

}

activity_main.xml

<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:id="@+id/rr"
   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=".MainActivity" >
   <Spinner
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/ss"/>
</RelativeLayout>

Output