Android : spinner sliding dropdown example

Android : spinner sliding dropdown example
This post about how to show spinner item like sliding view.
i have created two views. Button and ListView .
listview.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="@android:color/darker_gray"

    android:orientation="vertical" >

    <ListView

        android:id="@+id/listView1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="10dip"

        android:layout_marginRight="10dip"

        android:layout_marginTop="80dip"

        android:background="@android:color/white"

        android:scrollbars="none"

        android:scrollingCache="false"

        android:visibility="gone" >

    </ListView>

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentRight="true"

        android:layout_alignParentTop="true"

        android:background="@drawable/dropdownbg"

        android:text="Select Value" />

</RelativeLayout>

In activity adding transition for spinner onclick down and up.

package com.iamvijayakumar.dropdown;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.view.animation.TranslateAnimation;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.RelativeLayout;

public class MainActivity extends Activity implements OnClickListener {

       ListView listView;

       Button btn;

       ArrayList<String> list = new ArrayList<String>();

       boolean isClicked = true;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.listview);

              listView = (ListView) findViewById(R.id.listView1);

              btn = (Button) findViewById(R.id.button1);

              list.add("1");

              list.add("2");

              list.add("3");

              list.add("4");

              list.add("5");

              ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,

                           android.R.layout.simple_list_item_1, android.R.id.text1, list);

              listView.setAdapter(adapter);

              btn.setOnClickListener(new OnClickListener() {

                     @Override

                     public void onClick(View v) {

                           if (isClicked) {

                                  listView.setVisibility(View.VISIBLE);

                                  TranslateAnimation slide = new TranslateAnimation(0, 0,

                                                -1500, 0);

                                  slide.setDuration(2300);

                                  slide.setFillAfter(false);

                                  listView.startAnimation(slide);

                                  isClicked = false;

                           } else {

                                  TranslateAnimation slide = new TranslateAnimation(0, 0, 0,

                                                -4500);

                                  isClicked = true;

                                  slide.setDuration(4500);

                                  slide.setFillAfter(false);

                                  listView.startAnimation(slide);

                                  listView.setVisibility(View.GONE);

                           }

                     }

              });

              listView.setOnItemClickListener(new OnItemClickListener() {

                     @Override

                     public void onItemClick(AdapterView<?> parent, View view,

                                  int position, long id) {

                           // TODO Auto-generated method stub

                           btn.setText(list.get(position));

                           TranslateAnimation slide = new TranslateAnimation(0, 0, 0,

                                         -4500);

                           slide.setDuration(4500);

                           slide.setFillAfter(false);

                           listView.startAnimation(slide);

                           listView.setVisibility(View.GONE);

                     }

              });

       }

       @Override

       public void onClick(View v) {

       }

}