Java android布局上的折叠动画

我遇到了这个问题，我有一个类似手风琴的活动，按钮根据其状态展开或折叠布局，然后问题出现在动画中，展开动画非常完美，但折叠时，它通过父按钮上方的布局，我想相对于布局折叠它

对不起，我的英语不好，代码如下：

public class Animations extends Animation {

/**
 * Initializes expand collapse animation, has two types, collapse (1) and expand (0).
 * @param view The view to animate
 * @param duration
 * @param type The type of animation: 0 will expand from gone and 0 size to visible and layout size defined in xml. 
 * 1 will collapse view and set to gone
 */
public AnimationSet AnimationSet;

public Animations(String type) {
    if (type == "Expand")
        AnimationSet = ExpandAnimation();
    if (type == "Collapse")
        AnimationSet =  CollapseAnimation();    
}
public AnimationSet ExpandAnimation() {

    AnimationSet _set = new AnimationSet(true);

      Animation animation = new AlphaAnimation(0.0f, 1.0f);
      animation.setDuration(250);
      _set.addAnimation(animation);

      animation = new TranslateAnimation(
          Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f,
          Animation.RELATIVE_TO_SELF, -1.0f, Animation.RELATIVE_TO_SELF, 0.0f
      );
      animation.setDuration(150);
      _set.addAnimation(animation);

      return _set;

}
public AnimationSet CollapseAnimation() {

    AnimationSet set = new AnimationSet(true);

      Animation animation = new AlphaAnimation(1.0f, 1.0f);
      animation.setDuration(250);
      set.addAnimation(animation);

      animation = new TranslateAnimation(
          Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f,
          Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, -1.0f
      );
      animation.setDuration(250);
      set.addAnimation(animation);

      return set;

}

---

}

为什么不使用反转内极器来反转已经运行得如此完美的扩展动画

public class ReverseInterpolator implements Interpolator {
    public float getInterpolation(float paramFloat) {
        return Math.abs(paramFloat -1f);
    }
}

在_set变量上：

_set.setInterpolator(new ReverseInterpolator());

或

我还要强调一些你做得不正确的事情：

将.equals用于比较的字符串，而不是==。这是错误的->如果类型==展开。此外，请正确命名方法和变量，例如

public AnimationSet AnimationSet; //poor
public AnimationSet expandAnim; //better
public AnimationSet ExpandAnimation() { //poor
public AnimationSet expand() { //better

---

为什么不使用反转内极器反转已经非常完美的扩展动画

public class ReverseInterpolator implements Interpolator {
    public float getInterpolation(float paramFloat) {
        return Math.abs(paramFloat -1f);
    }
}

在_set变量上：

_set.setInterpolator(new ReverseInterpolator());

或

我还要强调一些你做得不正确的事情：

将.equals用于比较的字符串，而不是==。这是错误的->如果类型==展开。此外，请正确命名方法和变量，例如

public AnimationSet AnimationSet; //poor
public AnimationSet expandAnim; //better
public AnimationSet ExpandAnimation() { //poor
public AnimationSet expand() { //better

---

只需将属性添加到最顶部的布局。它具有类似淡出的默认动画

android:animateLayoutChanges="true"

---

然后设置可折叠布局的可见性消失/可见。

只需向最顶部的布局添加一个属性即可。它具有类似淡出的默认动画

android:animateLayoutChanges="true"

然后设置可折叠布局的可见性/可见