Spinner

Android Spinner resembles the combox box of AWT or Swing. It can be utilized to show the different alternatives to the client in which just a single thing can be chosen by the client. 

Android spinner resembles the drop down menu with different esteems from which the end client can choose just a single esteem. 

Android spinner is related with AdapterView. So you have to utilize one of the connector classes with spinner. 

Android Spinner class is the subclass of AsbSpinner class.

Android Spinner Example

In this example, we are going to display the country list. You need to use ArrayAdapter class to store the country list.

Let's see the simple example of spinner in android.

activity_main.xml

Drag the Spinner from the pallete, now the activity_main.xml file will like this:

<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context=".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="83dp" />  

RelativeLayout>  

Activity class

Let's write the code to display item on the spinner and perform event handling.

package com.example.spinner;  
import android.app.Activity;  
import android.os.Bundle;  
import android.view.Menu;  
import android.view.View;  
import android.widget.AdapterView;  
import android.widget.ArrayAdapter;  
import android.widget.Spinner;  
import android.widget.TextView;  
import android.widget.Toast;  
  
public class MainActivity extends Activity implements  
AdapterView.OnItemSelectedListener {  
    String[] country = { "India", "USA", "China", "Japan", "Other",  };  

    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        //Getting the instance of Spinner and applying OnItemSelectedListener on it  
        Spinner spin = (Spinner) findViewById(R.id.spinner1);  
        spin.setOnItemSelectedListener(this);  

        //Creating the ArrayAdapter instance having the country list  
        ArrayAdapter aa = new ArrayAdapter(this,android.R.layout.simple_spinner_item,country);  
        aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  
        //Setting the ArrayAdapter data on the Spinner  
        spin.setAdapter(aa);  
    }  

    //Performing action onItemSelected and onNothing selected  
    @Override  
    public void onItemSelected(AdapterView arg0, View arg1, int position,long id) {  
        Toast.makeText(getApplicationContext(),country[position] ,Toast.LENGTH_LONG).show();  
    }  

  
    @Override  
    public void onNothingSelected(AdapterView arg0) {  
        // TODO Auto-generated method stub  

    }  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.activity_main, menu);  
        return true;  
    }  
}