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");
        }
    }
}