animateLayoutChanges does not work well with nested layout?

Question

I have a nested layout like the following:

Answer 1

Ok, after digesting the first answer, I make it simple here, for those who don't get proper animation result when using android:animateLayoutChanges="true" in NESTED layout:

1. Make sure you add android:animateLayoutChanges="true" to the will-be-resized ViewGroup (LinearLayout/RelativeLayout/FrameLayout/CoordinatorLayout).

2. Use setVisibility() to control the visibility of your target View.

3. Listen carefully from here, add android:animateLayoutChanges="true" to the outer ViewGroup of your will-be-resized ViewGroup, this outer ViewGroup must be the one who wraps all the position-changing View affected by the animation.

4. Add following code in your Activity before the setVisibility(), here the rootLinearLayout is the outer ViewGroup I mentioned above:

    LayoutTransition layoutTransition = rootLinearLayout.getLayoutTransition();
    layoutTransition.enableTransitionType(LayoutTransition.CHANGING);
   

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Before:

After:

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Reminder: If you miss the 3rd step, you will get null pointer exception.

Good luck!