Android开发_Animation

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:id="@+id/layoutId"
 4     android:orientation="vertical"
 5     android:layout_width="fill_parent"
 6     android:layout_height="fill_parent"
 7     >
 8         <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 9         android:layout_width="fill_parent"
10         android:layout_height="fill_parent"
11         >
12             <!-- 添加图片 -->
13             <Button
14                 android:id="@+id/btn_add"
15                 android:layout_width="wrap_content"
16                 android:layout_height="wrap_content"
17                 android:text="添加图片"    
18             />
19             <!-- 删除图片 -->
20             <Button
21                 android:id="@+id/btn_delete"
22                 android:layout_width="wrap_content"
23                 android:layout_height="wrap_content"
24                 android:text="删除图片"
25             />
26         </LinearLayout>
27         <!-- 显示图片  -->    
28         <ImageView
29             android:id="@+id/iv_image"
30             android:layout_width="wrap_content"
31             android:layout_height="wrap_content"
32             android:layout_centerInParent="true"
33             android:layout_marginTop="120dip"
34             android:layout_marginLeft="50dip"
35             android:src="@drawable/p1"
36         />
37 </RelativeLayout>

 1 package com.b510;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.util.Log;
 6 import android.view.View;
 7 import android.view.ViewGroup;
 8 import android.view.View.OnClickListener;
 9 import android.view.animation.AlphaAnimation;
10 import android.view.animation.Animation;
11 import android.view.animation.Animation.AnimationListener;
12 import android.widget.Button;
13 import android.widget.ImageView;
14 
15 public class Main extends Activity {
16     private static final String TAG="Main";
17     /** 添加图片 */
18     private Button addButton;
19     /** 删除图片 */
20     private Button deleteButton;
21     /** 显示图片 */
22     private ImageView imageView;
23     /** RaletvieLayout布局，他是包含了</br>Button，ImageView控件,定义在main.xml文件中 */
24     private ViewGroup viewGroup;
25 
26     /** Called when the activity is first created. */
27     @Override
28     public void onCreate(Bundle savedInstanceState) {
29         super.onCreate(savedInstanceState);
30         setContentView(R.layout.main);
31         // 从main.xml文件中找到对应的控件
32         addButton = (Button) findViewById(R.id.btn_add);
33         deleteButton = (Button) findViewById(R.id.btn_delete);
34         imageView = (ImageView) findViewById(R.id.iv_image);
35         viewGroup = (ViewGroup) findViewById(R.id.layoutId);
36 
37         deleteButton.setOnClickListener(new OnClickListener() {
38 
39             @Override
40             public void onClick(View v) {
41                 // 申明一个AlphaAnimation对象，从完全不透明到完全透明
42                 AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.0f);
43                 // 设置动画持续时间为2秒钟
44                 alphaAnimation.setDuration(2000);
45                 // 执行动画前，延迟0.5秒钟
46                 alphaAnimation.setStartOffset(500);
47                 //为Animation对象设置监听器
48                 alphaAnimation.setAnimationListener(new AnimationListener() {
49                     @Override
50                     public void onAnimationStart(Animation animation) {
51                         Log.i(TAG, "start");
52                     }
53                     
54                     @Override
55                     public void onAnimationRepeat(Animation animation) {
56                         Log.i(TAG, "repeat");
57                     }
58                     
59                     @Override
60                     public void onAnimationEnd(Animation animation) {
61                         Log.i(TAG, "end");
62                         //从viewGroup中移除imageView
63                         viewGroup.removeView(imageView);
64                     }
65                 });
66                 imageView.startAnimation(alphaAnimation);
67             }
68         });
69 
70         addButton.setOnClickListener(new OnClickListener() {
71             @Override
72             public void onClick(View v) {
73                 // 申明一个AlphaAnimation对象，从完全透明到完全不透明
74                 AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 1.0f);
75                 // 设置动画持续时间为2秒钟
76                 alphaAnimation.setDuration(2000);
77                 // 执行动画前，延迟0.5秒钟
78                 alphaAnimation.setStartOffset(500);
79                 viewGroup.addView(imageView);
80                 // 启动动画
81                 imageView.startAnimation(alphaAnimation);
82             }
83         });
84     }
85 }