ANDROID_MARS学习笔记_S02_012_ANIMATION_利用AnimationListener在动画结束时删除或添加组件

Posted 2020-06-14

一、代码

1.xml
(1)activity_main.xml

 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" android:layout_width="fill_parent"
 5     android:layout_height="fill_parent">
 6     <Button android:id="@+id/addButtonId" android:layout_width="fill_parent"
 7         android:layout_height="wrap_content" android:layout_alignParentBottom="true"
 8         android:text="添加图片" />
 9         
10     <Button android:id="@+id/removeButtonId" android:layout_width="fill_parent"
11         android:layout_height="wrap_content" android:layout_above="@id/addButtonId"
12         android:text="删除图片" />
13         
14 
15         <ImageView android:id="@+id/imageViewId"
16             android:layout_width="wrap_content" android:layout_height="wrap_content"
17             android:layout_centerInParent="true" android:layout_marginTop="100dip"
18             android:src="@drawable/a1" />
19 </RelativeLayout>

 

2.java
(1)MainActivity.java

 1 package com.animationlistener;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.view.View.OnClickListener;
 7 import android.view.ViewGroup;
 8 import android.view.ViewGroup.LayoutParams;
 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 MainActivity extends Activity {
16     
17     private Button removeButton = null;
18     private Button addButton = null;
19     private ImageView imageView = null;
20     private ViewGroup viewGroup = null;
21     
22     @Override
23     protected void onCreate(Bundle savedInstanceState) {
24         super.onCreate(savedInstanceState);
25         setContentView(R.layout.activity_main);
26         
27         removeButton = (Button)findViewById(R.id.removeButtonId);
28         removeButton.setOnClickListener(new RemoveButtonListener());
29         addButton = (Button)findViewById(R.id.addButtonId);
30         addButton.setOnClickListener(new AddButtonListener());
31         
32         imageView = (ImageView)findViewById(R.id.imageViewId);
33         viewGroup = (ViewGroup) findViewById(R.id.layoutId);
34     }
35     
36     class AddButtonListener implements OnClickListener {
37         @Override
38         public void onClick(View v) {
39             Animation animation = new AlphaAnimation(0.0f, 1.0f);
40             animation.setDuration(1000);
41             animation.setStartOffset(500);
42             ImageView imageViewAdd = new ImageView(MainActivity.this);
43             imageViewAdd.setImageResource(R.drawable.a1);
44             viewGroup.addView(imageViewAdd, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
45             imageViewAdd.startAnimation(animation);
46         }
47     }
48 
49     class RemoveButtonListener implements OnClickListener {
50         @Override
51         public void onClick(View v) {
52             Animation animation = new AlphaAnimation(1.0f, 0.0f);
53             animation.setDuration(1000);
54             animation.setStartOffset(500);
55             animation.setAnimationListener(new RemoveAnimationListener());
56             imageView.startAnimation(animation);
57         }
58     }
59     
60     class RemoveAnimationListener implements AnimationListener {
61 
62         @Override
63         public void onAnimationStart(Animation animation) {
64             System.out.println("Start");
65         }
66 
67         @Override
68         public void onAnimationEnd(Animation animation) {
69             System.out.println("End");
70             viewGroup.removeView(imageView);
71         }
72 
73         @Override
74         public void onAnimationRepeat(Animation animation) {
75             System.out.println("Repeat");
76         }
77     }
78 }