Hide and unhide a view in Android

package com.AndroidHideView;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class AndroidHideView extends Activity {
 
 TextView targetText;
 Spinner spVisibility;
 
 String[] optVisibility = { "VISIBLE", 
        "INVISIBLE", 
        "GONE"};
 
 int[] valueVisibility = { View.VISIBLE, 
        View.INVISIBLE, 
        View.GONE};
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        targetText = (TextView)findViewById(R.id.targetview);
        spVisibility = (Spinner)findViewById(R.id.visibility);
        
        ArrayAdapter<String> adapterVisibility = new ArrayAdapter<String>(this,
          android.R.layout.simple_list_item_1, optVisibility);
        adapterVisibility.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spVisibility.setAdapter(adapterVisibility);
        spVisibility.setOnItemSelectedListener(spVisibilityOnItemSelectedListener);
    }
    
    private Spinner.OnItemSelectedListener spVisibilityOnItemSelectedListener
    = new Spinner.OnItemSelectedListener(){

  @Override
  public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
    long arg3) {
   // TODO Auto-generated method stub
   
   int visibility = valueVisibility[spVisibility.getSelectedItemPosition()];
   targetText.setVisibility(visibility);
   
  }

  @Override
  public void onNothingSelected(AdapterView<?> arg0) {
   // TODO Auto-generated method stub
   
  }};
    
}

<?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:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Spinner
    android:id="@+id/visibility"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="======================================="
    />
<TextView  
    android:id="@+id/targetview"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="This TextView can be hided and unhided."
    />
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="======================================="
    />
</LinearLayout>