Android Frame Layout

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
     >

    <Button
        android:id="@+id/btn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Push Button" />
    <ImageView 
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/pride"
        />

</FrameLayout>

package kr.android.layout8;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class FrameLayoutDemo extends Activity {
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		//이벤트 소스
		Button btn = (Button)findViewById(R.id.btn);

		//익명 내부 클래스 형태의 이벤트 처리
		btn.setOnClickListener(new Button.OnClickListener(){
			
			//이벤트 핸들러
			public void onClick(View v){
				ImageView img = (ImageView)findViewById(R.id.img);
				//View.VISIBLE : 보여짐
				//View.INVISIBLE : 안보여짐
				//View.GONE : 안보여지면서 해당 위치에서 제거
				if(img.getVisibility() == View.VISIBLE){
					img.setVisibility(View.INVISIBLE);
				}else{
					img.setVisibility(View.VISIBLE);
				}
			}
		});
	}
}