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

一、代码

1.xml
(1)activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/layoutId"
     android:orientation="vertical" android:layout_width="fill_parent"
     android:layout_height="fill_parent">
     <Button android:id="@+id/addButtonId" android:layout_width="fill_parent"
         android:layout_height="wrap_content" android:layout_alignParentBottom="true"
         android:text="添加图片" />

     <Button android:id="@+id/removeButtonId" android:layout_width="fill_parent"
         android:layout_height="wrap_content" android:layout_above="@id/addButtonId"
         android:text="删除图片" />

         <ImageView android:id="@+id/imageViewId"
             android:layout_width="wrap_content" android:layout_height="wrap_content"
             android:layout_centerInParent="true" android:layout_marginTop="100dip"
             android:src="@drawable/a1" />
 </RelativeLayout>

2.java
(1)MainActivity.java

 package com.animationlistener;

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 import android.view.animation.AlphaAnimation;
 import android.view.animation.Animation;
 import android.view.animation.Animation.AnimationListener;
 import android.widget.Button;
 import android.widget.ImageView;

 public class MainActivity extends Activity {

     private Button removeButton = null;
     private Button addButton = null;
     private ImageView imageView = null;
     private ViewGroup viewGroup = null;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         removeButton = (Button)findViewById(R.id.removeButtonId);
         removeButton.setOnClickListener(new RemoveButtonListener());
         addButton = (Button)findViewById(R.id.addButtonId);
         addButton.setOnClickListener(new AddButtonListener());

         imageView = (ImageView)findViewById(R.id.imageViewId);
         viewGroup = (ViewGroup) findViewById(R.id.layoutId);
     }

     class AddButtonListener implements OnClickListener {
         @Override
         public void onClick(View v) {
             Animation animation = new AlphaAnimation(0.0f, 1.0f);
             animation.setDuration(1000);
             animation.setStartOffset(500);
             ImageView imageViewAdd = new ImageView(MainActivity.this);
             imageViewAdd.setImageResource(R.drawable.a1);
             viewGroup.addView(imageViewAdd, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
             imageViewAdd.startAnimation(animation);
         }
     }

     class RemoveButtonListener implements OnClickListener {
         @Override
         public void onClick(View v) {
             Animation animation = new AlphaAnimation(1.0f, 0.0f);
             animation.setDuration(1000);
             animation.setStartOffset(500);
             animation.setAnimationListener(new RemoveAnimationListener());
             imageView.startAnimation(animation);
         }
     }

     class RemoveAnimationListener implements AnimationListener {

         @Override
         public void onAnimationStart(Animation animation) {
             System.out.println("Start");
         }

         @Override
         public void onAnimationEnd(Animation animation) {
             System.out.println("End");
             viewGroup.removeView(imageView);
         }

         @Override
         public void onAnimationRepeat(Animation animation) {
             System.out.println("Repeat");
         }
     }
 }