缩小动画 - Android

Question

我在我的应用程序中使用放大动画的视图。当用户点击一个按钮时，下一个活动从该按钮中放大。 This是我使用下面给出的代码实现的。

由于在上面提到的视频中，显示的代码仅适用于糖果软糖和以上我不得不使用下面给出的代码。

Next_Activity.java

Bundle b = getIntent().getExtras(); // Bundle passed from previous activity to this activity 

    x = b.getInt("X");    //b is button in previous activity 
    y = b.getInt("Y");    //b is button in previous activity 
    xh = b.getInt("XH");   //b is button in previous activity 
    yh = b.getInt("YH");   //b is button in previous activity 

    AnimationSet set = new AnimationSet(true); 

    width = display.getWidth(); 
    height = display.getHeight(); 


    Animation scale = new ScaleAnimation((float)xh/width, 1f, (float)yh/height , 1f, x, y); 

    Animation alpha = new AlphaAnimation(.75f, 1f); 

    set.addAnimation(scale); 
    set.addAnimation(alpha); 

    set.setDuration(300); 

    main.startAnimation(set);   //main is rootLayout of this activity 

Main_Activity（带按钮的活动）

Bundle bundle = new Bundle(); 
    int[] xy = new int[2]; 

    button.getLocationOnScreen(xy); 

    bundle.putInt("X", xy[0] + (b.getWidth()/2)); 
    bundle.putInt("Y", xy[1] + (b.getHeight()/2)); 
    bundle.putInt("XH", b.getWidth()); 
    bundle.putInt("YH", b.getHeight()); 

    Intent startnextactivity = new Intent(Table_main.this,Next_Activity.class); 
    startnextactivity.putExtras(bb); 
    startActivity(startnextactivity); 

现在（在动画变焦的活动），我的问题是，我该如何扭转这种动画？我的意思是当我点击按钮时，活动从该按钮放大。那么如何在按下后退按钮时将活动缩小到同一个按钮？

@Override 
public void onBackPressed() 
{ 
Animation scale = new ScaleAnimation((float)xh/width, 1f, (float)yh/height , 1f, x, y); 
// What is the zoom out animation of the above line?? 
} 

Answer 1

@Override 
public void onBackPressed() { 
    Bundle b = getIntent().getExtras(); 
    x = b.getInt("X"); 
    y = b.getInt("Y"); 
    xh = b.getInt("XH"); 
    yh = b.getInt("YH"); 
    AnimationSet set = new AnimationSet(true); 
    width = display.getWidth(); 
    height = display.getHeight(); 
    Animation scale = new ScaleAnimation((1f, (float) xh/width, 1f, (flaot) yh/height, x, y); 
    Animation alpha = new AlphaAnimation(.75f, 1f); 
    set.addAnimation(scale); 
    set.addAnimation(alpha); 
    set.setDuration(300); 
    main.startAnimation(set); 
}