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Floating action button animation

Shown here is an example animation of a Motorla Connect floating button action. The question is, how do you make this animation?

https://www.youtube.com/watch?v=oVKQfCZ3z2g

I decompiled apk them, but this animation is done through code and doesn't use any resource in the animation folder.

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5 answers


From @ Zielony's answer, I did it exactly where I wanted it.

Below is the code for applying the effect correctly.

scale_fab_in.xml

<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="500"
    android:fromXScale="0"
    android:fromYScale="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toXScale="1"
    android:toYScale="1"
    android:interpolator="@android:interpolator/overshoot"/>

scale_fab_out.xml



<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="400"
    android:fromXScale="1"
    android:fromYScale="1"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toXScale="0"
    android:toYScale="0"
    android:interpolator="@android:interpolator/overshoot"/>

EDIT 2/16/2016 - Another way to do it:

Place below code in FAB code or any other view.

//global
    private static final int FAB_ANIM_DURATION = 200;

public void hide() {
        // Only use scale animation if FAB is visible
        if (getVisibility() == View.VISIBLE) {
            // Pivots indicate where the animation begins from
            float pivotX = getPivotX() + getTranslationX();
            float pivotY = getPivotY() + getTranslationY();

            // Animate FAB shrinking
            ScaleAnimation anim = new ScaleAnimation(1, 0, 1, 0, pivotX, pivotY);
            anim.setDuration(FAB_ANIM_DURATION);
            anim.setInterpolator(getInterpolator());
            startAnimation(anim);
        }
        setVisibility(View.INVISIBLE);
    }


    public void show() {
        show(0, 0);
    }

    public void show(float translationX, float translationY) {

        // Set FAB translation
        setTranslation(translationX, translationY);

        // Only use scale animation if FAB is hidden
        if (getVisibility() != View.VISIBLE) {
            // Pivots indicate where the animation begins from
            float pivotX = getPivotX() + translationX;
            float pivotY = getPivotY() + translationY;

            ScaleAnimation anim;
            // If pivots are 0, that means the FAB hasn't been drawn yet so just use the
            // center of the FAB
            if (pivotX == 0 || pivotY == 0) {
                anim = new ScaleAnimation(0, 1, 0, 1, Animation.RELATIVE_TO_SELF, 0.5f,
                        Animation.RELATIVE_TO_SELF, 0.5f);
            } else {
                anim = new ScaleAnimation(0, 1, 0, 1, pivotX, pivotY);
            }

            // Animate FAB expanding
            anim.setDuration(FAB_ANIM_DURATION);
            anim.setInterpolator(getInterpolator());
            startAnimation(anim);
        }
        setVisibility(View.VISIBLE);
    }

    private void setTranslation(float translationX, float translationY) {
        if (Build.VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB_MR1) {
            animate().setInterpolator(getInterpolator()).setDuration(FAB_ANIM_DURATION)
                    .translationX(translationX).translationY(translationY);
        }
    }

    private Interpolator getInterpolator() {
        return AnimationUtils.loadInterpolator(getContext(), R.interpolator.fab_interpolator);
    }


<item name="fab_interpolator" type="interpolator">@android:interpolator/decelerate_cubic</item>
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The button only scales from 0 to 1 using the OvershootInterpolator. It should be something like this:

ScaleAnimation anim = new ScaleAnimation(0,1,0,1);
anim.setFillBefore(true);
anim.setFillAfter(true);
anim.setFillEnabled(true);
anim.setDuration(300);
anim.setInterpolator(new OvershootInterpolator());
fab.startAnimation(anim);


http://developer.android.com/reference/android/view/animation/OvershootInterpolator.html

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You can use this method to animate any kind of scaling. If you reverese 0 and 1 you wull get scaling animation

 public static void scale(View view, long delay) {
        view.setScaleX(0);
        view.setScaleY(0);
        view.animate()
                .scaleX(1)
                .scaleY(1)
                .setDuration(500)
                .setStartDelay(delay)
                .setInterpolator(new OvershootInterpolator())
                .start();
    }
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As for me, this type of scale animation looks better with this value set startOffset

. This worked for me:

<scale xmlns:android="http://schemas.android.com/apk/res/android"
       android:duration="400"
       android:fillBefore="true"
       android:fillAfter="true"
       android:fillEnabled="true"
       android:startOffset="500"
       android:fromXScale="0"
       android:fromYScale="0"
       android:pivotX="50%"
       android:pivotY="50%"
       android:toXScale="1"
       android:toYScale="1"
       android:interpolator="@android:interpolator/overshoot"/>
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Use the following code to get the same effect.

    ScaleAnimation anim = new ScaleAnimation(0, 1, 0, 1, 50, 50);
    anim.setFillBefore(true);
    anim.setFillAfter(true);
    anim.setFillEnabled(true);
    anim.setDuration(400);
    anim.setInterpolator(new OvershootInterpolator());
    imageView.startAnimation(anim);
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