动画隐藏或者显示控件

效果图

二、布局main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <Button 
        android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:layout_alignParentTop="true"
       android:layout_centerInParent="true"
       android:id="@+id/btn"
       android:text="按下显示动画"/>

    
  <ImageView 
      android:layout_width="fill_parent"
      android:layout_height="200dp"
      android:layout_alignParentBottom="true"
      android:id="@+id/img"
      android:src="@drawable/bg"/>

</RelativeLayout>

三、mainactivity

package com.ct.hide;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    private ImageView img;
    private Button btn;
    private boolean flag = false;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        img = (ImageView)findViewById(R.id.img);
        btn = (Button)findViewById(R.id.btn);
        btn.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                flag = !flag;
                if(flag){
                    img.setAnimation(new MenuHideShow().hide());
                    img.setVisibility(View.GONE);
                }else {
                    img.setAnimation(new MenuHideShow().show());
                    img.setVisibility(View.VISIBLE);
                }
            }
        });
        
    }
    
    public class MenuHideShow{
        Animation showMenu,hideMenu;
        
        public Animation show(){
            showMenu = new ScaleAnimation(0, 1, 0, 1,
                    Animation.RELATIVE_TO_SELF, 0.5f,
                    Animation.RELATIVE_TO_SELF, 0);
            showMenu.setDuration(1000);
            return showMenu;
        }
        
        public Animation hide(){
            hideMenu = new ScaleAnimation(1, 0, 1, 0,
                    Animation.RELATIVE_TO_SELF, 0.5f,
                    Animation.RELATIVE_TO_SELF, 1);

            hideMenu.setDuration(1000);

            Log.v("menuAnimation", "hide");

            return hideMenu;
        }
    }
}

 (在F:\java\MyHideShow)