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c#visual-studioanimationxamarinxamarin.android
Adeptus Mechanicus
Adeptus Mechanicus

Reputation: 171

Height/width animation in Android Visual Studio Xamarin

I'd like to know, is it possible to make height/width animation for View in Visual Studio Xamarin? For example, when a user clicks on a button the height of a view changes.

I looked for solution on the Internet, but only found Xamarin.Forms solution, but I need solution not for XamarinForms. Using scaleY is not a solution.

Upvotes: 0

Views: 1092

Answers (1)

Adeptus Mechanicus
Adeptus Mechanicus

Reputation: 171

So, I have found solution. We have to use ValueAnimator. 

clickedButton.Click += (s,e) =>{
    int viewHeight = animatedView.Height;
    ValueAnimator animator = ValueAnimator.OfInt(viewHeight, 0);
    animator.SetDuration(500);
    animator.Update += (object sender, ValueAnimator.AnimatorUpdateEventArgs e) =>
    {
        var value = (int)animator.AnimatedValue;
        ViewGroup.LayoutParams layoutParams = animatedView.LayoutParameters;
        layoutParams.Height = value;
        animatedView.LayoutParameters = layoutParams;
    };
    animator.Start();
}

Or we can create function for collapse/expand animation

ValueAnimator animateCollapse(int from, int to, int duration, View animatedView)
{
    ValueAnimator animator = ValueAnimator.OfInt(from, to);
    animator.SetDuration(duration);
    animator.Update += (object sender, ValueAnimator.AnimatorUpdateEventArgs e) =>
    {
        var value = (int)animator.AnimatedValue;
        ViewGroup.LayoutParams layoutParams = animatedView.LayoutParameters;
        layoutParams.Height = value;
        animatedView.LayoutParameters = layoutParams;
    };
    return animator;
}
clickedButton.Click += (s,e) =>{
    ValueAnimator animator;
    if (isExpanded){
        isExpanded = false;
        animator = animateCollapse(originalHeight, 0, 500, animatedView);
    }
    else{
        isExpanded = true;
        animator = animateCollapse(0, originalHeight, 500, animatedView);
    }
    animator.Start();
}

Upvotes: 4

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