Change position of view after end of animation

Question

I develop a widget based on ViewGroup and my problem is that I need to save position of items after the end of animation. I called setFillAfter(true) in my animation object I created AnimationListener and in it's onAnimationEnd method call View.layout(l,t,r,b) to set the position after animation, because I want animation to start from new item's position next time. But in this case it looks like items are layouted twice. If I don't use View.layout(l,t,r,b) at the end of animation, next animation starts from previous position. Here is my code:

private void scrollUp() {
    for(int i = 0; i < getChildCount(); i++) {
        final View child = getChildAt(i);
        final int index = i; 
        final int newleft = child.getLeft() + mOffsetBetweenItems;
        final int newTop = child.getTop() - mOffsetBetweenItems;
        TranslateAnimation scrollUp = new TranslateAnimation(0, mOffsetBetweenItems, 0, -mOffsetBetweenItems);          
        scrollUp.setDuration(1500);
        scrollUp.setFillAfter(true);        
        scrollUp.setAnimationListener(
            new AnimationListener() {

                @Override
                public void onAnimationStart(Animation animation) {}

                @Override
                public void onAnimationRepeat(Animation animation) {}

                @Override
                public void onAnimationEnd(Animation animation) {
                    child.layout(newleft, newTop, newleft + child.getMeasuredWidth(), newTop + child.getMeasuredHeight() );
                }
            }
        );

        child.startAnimation(scrollUp);
    }
}

Please give me an advice how should I reset view's position accordingly to the end position of animation?

changing position means you want set it in BOTTOM or TOP in layout, you want like this.. — RajaReddy PolamReddy, Dec 13 '11 at 13:18
not BOTTOM or TOP, but in concrete X,Y coordinates which are defined by `view.layout()` method — teoREtik, Dec 13 '11 at 13:22

score 20 · Answer 1 · edited May 23 '17 at 11:54

20

You must use ObjectAnimator , it works from API 11 level . It changes View position automatic,

here is the example

ObjectAnimator objectAnimator= ObjectAnimator.ofFloat(mContent_container, "translationX", startX, endX);
objectAnimator.setDuration(1000);
objectAnimator.start();

Thanks JUL for his answer

If your app not found object animator, change the API level from Project -> properties -> Android , than import android.animation.ObjectAnimator;

edited May 23 '17 at 11:54

Community

1
1

answered Dec 05 '12 at 16:03

Hayk Nahapetyan

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It animates the view. View coordinates are not changed with Object animator. – mertsimsek May 16 '17 at 07:48

score 12 · Accepted Answer · answered Dec 13 '11 at 13:45

I did it. Here is the code:

private void scrollUp() {
    for(int i = 0; i < getChildCount(); i++) {
        final View child = getChildAt(i);
        final int index = i; 
        final int newleft = child.getLeft() + mOffsetBetweenItems;
        final int newTop = child.getTop() - mOffsetBetweenItems;
        TranslateAnimation scrollUp = new TranslateAnimation(0, mOffsetBetweenItems, 0, -mOffsetBetweenItems);          
        scrollUp.setDuration(1500);
        scrollUp.setFillEnabled(true);        
        scrollUp.setAnimationListener(
            new AnimationListener() {

                @Override
                public void onAnimationStart(Animation animation) {}

                @Override
                public void onAnimationRepeat(Animation animation) {}

                @Override
                public void onAnimationEnd(Animation animation) {
                    child.layout(newleft, newTop, newleft + child.getMeasuredWidth(), newTop + child.getMeasuredHeight() );
                }
            }
        );

        child.startAnimation(scrollUp);
    }
}

Just removed setFillAfter(true) and write setFillEnabled(true) instead of. But in this case I don't understand the logic of setFillEnabled() working, because it provides behavior not like describes in documentation.

Setting the new left in onAnimationEnd fixed my issues. Thanks. In your code, at what point would mOffsetBetweenItems be set/updated? — speedynomads, Jul 19 '13 at 08:39
Note: Doesn't work on Lollipop at least (guessing at some API level it was incidentally implemented as above, but doesn't work at least on Lollipop for sure) — DragonJawad, Sep 27 '15 at 09:52

score 0 · Answer 3 · answered Dec 13 '11 at 13:17

0

Reverse your animation; Start by giving your view a new position and then animate from the old position to the new position.

answered Dec 13 '11 at 13:17

Jave

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If I give a new position firstly, it's immidiately redrawing my view in new position – teoREtik Dec 13 '11 at 13:20
Not if you call startAnimation() as soon as you have changed the position. – Jave Dec 13 '11 at 13:22
If I call `View.layout()` before `view.startAnimation()` it redraws my view and animation starts from new position – teoREtik Dec 13 '11 at 13:23
Ah, but there are other ways to reposition your view than calling `View.layout()`. Personally I tend to modify the LayoutParams owned by the view. – Jave Dec 13 '11 at 13:31
`LayoutParams` just allow you to point new width and height, but I need to point also left and top coordinates – teoREtik Dec 13 '11 at 13:32
If you have a layout like `FrameLayout`, you van use the topMargin and leftMargin values to define an offset from the top left corner. Of course, this might not be a convenient way to animate all the time, as you'll have to compensate for the margins etc. – Jave Dec 13 '11 at 13:48

Change position of view after end of animation

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