Example of Spinner Control in Android

1. Create XML file for layout

activity_spinner_demo.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:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     android:paddingBottom="@dimen/activity_vertical_margin"
     tools:context="dhaval.SpinnerDemo">
    <TextView
        android:id="@+id/lblCatList"
        android:text="Select Category"
        android:textSize="20dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Spinner
        android:layout_width="fill_parent"
        android:layout_below="@+id/lblCatList"
        android:layout_height="wrap_content"
        android:id="@+id/mSpnStudent"
        />
</RelativeLayout>

 2.After that Put Following Code in Your Class File
package dhaval;

import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import com.tristate.truepal.R;
public class SpinnerDemo extends Activity implements AdapterView.OnItemSelectedListener {
    Spinner mSpnStudent;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner_demo);
        mSpnStudent=(Spinner)findViewById(R.id.mSpnStudent);
        // Create an ArrayAdapter using the string array and a default spinner layout
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
                R.array.mStudent, android.R.layout.simple_spinner_item);
        mSpnStudent.setOnItemSelectedListener(this);
        // Specify the layout to use when the list of choices appears
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // Apply the adapter to the spinner
        mSpnStudent.setAdapter(adapter);
    }
    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        // An item was selected. You can retrieve the selected item using
        // parent.getItemAtPosition(pos)
        Toast.makeText(getBaseContext(),adapterView.getItemAtPosition(i)+"",Toast.LENGTH_SHORT).show();
    }
    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {
    }
}
 3.And also put following code in your string file
<string-array name="mStudent">
    <item>Dhaval</item>
    <item>Gopal</item>
    <item>Mohit</item>
    <item>Amit</item>
    <item>Rupal</item>
    <item>Upasana</item>
    <item>Ajay</item>
    <item>Vishnu</item>
</string-array>