Android Animation Listener---实现图片渐隐删除和添加

AnimationListener的使用方法

       1.AnimationListener是一个监听器，该监听器在动画执行的各个阶段会得到通知，从而调用相应的方法；

       2.AnimationListener主要包括如下三个方法：

              ·onAnimationEnd(Animation animation) - 当动画结束时调用

              ·onAnimationRepeat(Animation animation) - 当动画重复时调用

              ·onAniamtionStart(Animation animation) - 当动画启动时调用

直接上demo测试程序:实现的功能是:当要删除图片时,图片会慢慢的渐隐消去;当图片添加进来是,图片慢慢的显示出来

AnimationListenerActivity.java

package com.example.androidanimationlistenerdemos;

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 AnimationListenerActivity extends Activity {
    private Button addButton = null;
    private Button deleteButton = null;
    private ImageView imageView = null;
    private ViewGroup viewGroup = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        addButton = (Button) findViewById(R.id.addButton);
        deleteButton = (Button) findViewById(R.id.deleteButton);
        imageView = (ImageView) findViewById(R.id.image);
        // LinearLayout下的一组控件
        viewGroup = (ViewGroup) findViewById(R.id.layout);
        addButton.setOnClickListener(new AddButtonListener());
        deleteButton.setOnClickListener(new DeleteButtonListener());
    }

    private class AddButtonListener implements OnClickListener {
        public void onClick(View v) {
            // 淡入
            AlphaAnimation animation = new AlphaAnimation(0.0f, 1.0f);
            animation.setDuration(1000);
            animation.setStartOffset(500);
            // 创建一个新的ImageView
            /*
             * ImageView newImageView = new ImageView(
             * AnimationListenerActivity.this);
             * newImageView.setImageResource(R.drawable.image);
             * viewGroup.addView(newImageView, new LayoutParams(
             * LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
             * newImageView.startAnimation(animation);
             */

            imageView = new ImageView(AnimationListenerActivity.this);
            imageView.setImageResource(R.drawable.image);
            viewGroup.addView(imageView, new LayoutParams(
                    LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
            imageView.startAnimation(animation);

        }
    }

    private class DeleteButtonListener implements OnClickListener {
        public void onClick(View v) {
            // 淡出
            AlphaAnimation animation = new AlphaAnimation(1.0f, 0.0f);
            animation.setDuration(1000);
            animation.setStartOffset(500);
            // 为Aniamtion对象设置监听器
            animation.setAnimationListener(new RemoveAnimationListener());
            imageView.startAnimation(animation);
        }
    }

    private class RemoveAnimationListener implements AnimationListener {
        // 动画效果执行完时remove
        public void onAnimationEnd(Animation animation) {
            System.out.println("onAnimationEnd");
            viewGroup.removeView(imageView);
        }

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

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

布局文件xml:main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/layout"
    android:orientation="vertical" 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <Button android:id="@+id/addButton" 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:layout_alignParentBottom="true"
        android:text="添加图片" />
    <Button android:id="@+id/deleteButton" 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:layout_above="@id/addButton"
        android:text="删除图片" />
    <ImageView android:id="@+id/image"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" 
        android:layout_marginTop="100dip"
        android:src="@drawable/image" />
</RelativeLayout>

 

drawable[-***]目录下放一张image.png图片

demo 下载:http://pan.baidu.com/s/1gdnGswj