LayoutTransition 容器布局动画

在Property Animation中还有一个知识点没有讲到，那就是LayoutTransition容易布局动画，什么是容器布局动画？容器布局动画就是当一个布局

容器中的view方式改变时所产生的动画，比如：但一个相对布局中新增加一个view时或者删除一个view时，那么就可以通过一个动画来进行表现，

如：这个view是以什么形式增加进来或者删除出去。

android中提供了四种容器动画：

1、APPEARING: 动画所运行的项目出现在这个容器中时，即：view显示时的动画

2、CHANGE_APPEARING: 由于在这个容器总新增加了一个view，而导致原来的view位置发生改变所以会触发这个动画。

3、DISAPPEARING: view在这个容器中消失时触发的动画

4、CHANGE_DISAPPEARING: 由于在这个容器中移除了一个view，而导致原来的view位置发生改变所以会触发这个动画。

那么怎样使用呢？

1、创建LayoutTransition对象mTransitioner

2、创建动画

3、在xml文件中将相应布局的属性android:animateLayoutChanges="true"设置为true

4、将动画通过mTransitioner的setAnimator方法设置给mTransitioner

5、通过布局控件的setLayoutTransition方法将mTransitioner设置进去

下面就介绍其具体使用方法

public void serTransition(){
mTransitioner = new LayoutTransition();
setupCustomAnimations();
ll.setLayoutTransition(mTransitioner);
}

private void setupCustomAnimations() {
// 动画：CHANGE_APPEARING
// Changing while Adding
/*PropertyValuesHolder pvhLeft = PropertyValuesHolder.ofInt("left", 0, 1);
PropertyValuesHolder pvhTop = PropertyValuesHolder.ofInt("top", 0, 1);
PropertyValuesHolder pvhRight = PropertyValuesHolder.ofInt("right", 0,1);
PropertyValuesHolder pvhBottom = PropertyValuesHolder.ofInt("bottom",0, 1);
PropertyValuesHolder pvhScaleX = PropertyValuesHolder.ofFloat("scaleX",1f, 0f, 1f);
PropertyValuesHolder pvhScaleY = PropertyValuesHolder.ofFloat("scaleY",1f, 0f, 1f);

final ObjectAnimator changeIn = ObjectAnimator.ofPropertyValuesHolder(
this, pvhLeft, pvhTop, pvhRight, pvhBottom, pvhScaleX,pvhScaleY).
setDuration(mTransitioner.getDuration(LayoutTransition.CHANGE_APPEARING));

mTransitioner.setAnimator(LayoutTransition.CHANGE_APPEARING, changeIn);
changeIn.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setScaleX(1f);
view.setScaleY(1f);
}
});

// 动画：CHANGE_DISAPPEARING
// Changing while Removing
Keyframe kf0 = Keyframe.ofFloat(0f, 0f);
Keyframe kf1 = Keyframe.ofFloat(.9999f, 360f);
Keyframe kf2 = Keyframe.ofFloat(1f, 0f);
PropertyValuesHolder pvhRotation = PropertyValuesHolder.ofKeyframe(
"rotation", kf0, kf1, kf2);
final ObjectAnimator changeOut = ObjectAnimator
.ofPropertyValuesHolder(this, pvhLeft, pvhTop, pvhRight,pvhBottom, pvhRotation)
.setDuration(mTransitioner.getDuration(LayoutTransition.CHANGE_DISAPPEARING));

mTransitioner.setAnimator(LayoutTransition.CHANGE_DISAPPEARING,changeOut);

changeOut.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotation(0f);
}
});

// 动画：APPEARING
// Adding
ObjectAnimator animIn = ObjectAnimator.ofFloat(null, "rotationY", 90f,
0f).setDuration(mTransitioner.getDuration(LayoutTransition.APPEARING));
mTransitioner.setAnimator(LayoutTransition.APPEARING, animIn);
animIn.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotationY(0f);
}
});*/

// 动画：DISAPPEARING
// Removing
ObjectAnimator animOut = ObjectAnimator.ofFloat(null, "rotationX", 0f,90f).
setDuration(mTransitioner.getDuration(LayoutTransition.DISAPPEARING));
mTransitioner.setAnimator(LayoutTransition.DISAPPEARING, animOut);
animOut.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator anim) {
View view = (View) ((ObjectAnimator) anim).getTarget();
view.setRotationX(0f);
}
});
}

参考链接：/article/4672027.html