Spinners in Android

The Android Spinner Control is definitely the equivalent of the drop-down selector . By making use of spinner control you basically obtain the capability to choose from a list without taking up all of the display screen space of a ListView.

Spinners provide a quick way to select one value from a set. In the default state, a spinner shows its currently selected value. Touching the spinner displays a dropdown menu with all other available values, from which the user can select a new one.

You can add a spinner to your layout with the Spinner object. You should usually do so in your xml layout with a  <spinner>  element.
For example:

 <Spinner
    
        android:id="@+id/myspinner"    
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

Here we go with java source code:
in java file:

 
public class simplespinnersactivity extends Activity implements OnItemSelectedListener {
       TextView selection;
       String[] items = { "this", "is", "a","really","a" "simple","list", "in", "android", "ok" };   

  @Override
      public void onCreate(Bundle savedInstanceState)
         {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.main);
           selection = (TextView) findViewById(R.id.selection);
           Spinner spin = (Spinner) findViewById(R.id.spinner);
           spin.setOnItemSelectedListener(this);
           ArrayAdapter aa = new ArrayAdapter(this,android.R.layout.simple_spinner_item,items);  
           aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
           spin.setAdapter(aa);
          }
    public void onItemSelected(AdapterView parent, View v,int  position,long id)
    {
        selection.setText(items[position]);
    }
    public void onNothingSelected(AdapterView parent)
    {
         selection.setText("");
    }
    }

in xml file:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    > 
<TextView 
    android:id="@+id/selection"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"/> 

<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:drawSelectorOnTop = "true"> 

</Spinner> 
  </LinearLayout> 

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