¿如何制作正确的动画？ （没有XML的Android Java）

Question

I have the next code:

public void desaparecer(final LinearLayout parent, View hijo, int espaciofinal) {

        parent.removeView(hijo); //remote the view of the parent

        final LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)parent.getChildAt(0).getLayoutParams(); //create the params

        final int espacioIni = parent.getChildAt(0).getHeight(); //i get the height from start

        ValueAnimator animator = ValueAnimator.ofInt(params.height, espaciofinal); //pass the params and the final height

        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {

                params.height = (Integer) valueAnimator.getAnimatedValue();
                parent.getChildAt(0).requestLayout(); //request
            }
        });
        animator.setDuration(300); //set the anim duration   

        animator.start(); //start the animation

    }

The animation don't work well. The idea would be that start the animation with the initial height. (This would be the correct way)

But, by reasons that i don't understand, the height (when start the animation) pass to be 0 and i need that don't destroy the original height.

Any idea? I accept all ideas, except xml sources. I can't use it by reasons of my team.

Thx.

Answer 1

For animation of changes on a layout you can set animateLayoutChanges="true" to ViewGroup item. And any changes will be animated with default animation. If you want to change the animation behavior you can set to ViewGroup your oun LayoutTransition object. Here google talks video which can help you, I hope )

Answer 2

solved:

final int espacioIni = parent.getChildAt(2).getHeight();

    params.height = espacioIni;

    ValueAnimator animator = ValueAnimator.ofInt(params.height,espacio);

into ofInt pass the correct parametres and work well (startParameter, finishParameter)