Here I have created spinner function in android. Spinner can be used to display the multiple options to the user in which only one item can be selected by the user. Android spinner works like dropdown menu. In dropdown menu there will be multiple values from which the user have to select only one value. In the below code example I have described how to make spinner in android. Step (1)- activity_main.xml.

 <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>  

Step (2)-MainActivity.

  public class MainActivity extends Activity implements  
 AdapterView.OnItemSelectedListener {  
  
    String[] country = {"UK", "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);  
         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);  
    }  
     @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) {    
    }  
 
    @Override  
     public boolean onCreateOptionsMenu(Menu menu) {  
      getMenuInflater().inflate(R.menu.activity_main, menu);  
        return true;  
    }  
 }