xml使用默认的LayoutTransition就是在最外层容器上设置属性(内部容器发生变化时候会有淡入淡出的动画):
android:animateLayoutChanges="true"
java code中使用系统默认LayoutTransition
LayoutTransition mLayoutTransition = new LayoutTransition();
mViewGroup_XXX.setLayoutTransition(mLayoutTransition);