android

Animation图片渐变动画 Demo

最终实现效果：

main.xml

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<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:orientation="vertical" >  
      
    <ImageView   
        android:id="@+id/iv_animation_logo"  
        android:contentDescription="@string/animationContentDescription"  
        android:layout_width="fill_parent"  
        android:layout_height="fill_parent"  
        android:src="@drawable/animation_logo"/>  
  
</RelativeLayout>

AnimationDemoActivity.java

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package com.royal.animationDemo;  
  
import android.app.Activity;  
import android.os.Bundle;  
import android.view.Window;  
import android.view.WindowManager;  
import android.view.animation.AlphaAnimation;  
import android.view.animation.Animation;  
import android.view.animation.Animation.AnimationListener;  
  
/** 
 * 图片渐变动画 
 */  
public class AnimationDemoActivity extends Activity {  
      
    public static final int ANIMATION_TIME = 5000;  
      
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);  
        // 去掉界面任务条  
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);  
        setContentView(R.layout.main);  
          
        //图片渐变模糊度始终  
        AlphaAnimation aa = new AlphaAnimation(0.1f,1.0f);  
        //渐变时间  
        aa.setDuration(ANIMATION_TIME);  
        //展示图片渐变动画  
        this.findViewById(R.id.iv_animation_logo).startAnimation(aa);  //也可以使用setAnimation(aa);
          
        //渐变过程监听  
        aa.setAnimationListener(new AnimationListener() {  
              
            /** 
             * 动画开始时 
             */  
            @Override  
            public void onAnimationStart(Animation animation) {  
                System.out.println("动画开始...");  
            }  
              
            /** 
             * 重复动画时 
             */  
            @Override  
            public void onAnimationRepeat(Animation animation) {  
                System.out.println("动画重复...");  
            }  
              
            /** 
             * 动画结束时 
             */  
            @Override  
            public void onAnimationEnd(Animation animation) {  
                System.out.println("动画结束...");  
            }  
        });  
    }  
}

string.xml

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<?xml version="1.0" encoding="utf-8"?>  
<resources>
    <string name="app_name">AnimationDemo</string>  
    <string name="animationContentDescription">渐变图片动画描述</string> 
</resources>

打印结果：

android中提供了4中动画：
AlphaAnimation 透明度动画效果
ScaleAnimation 缩放动画效果
TranslateAnimation 位移动画效果
RotateAnimation 旋转动画效果
四种动画及动画集合的使用见源码【百度网盘-AnimationDemo-0.2（Android动画）】

扩展阅读：Android 动画之AlphaAnimation应用详解