FloatingActionButton icon animation (Android FAB src drawable animation) -

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i trying find documentation how create icon animation of fab's (of design support library), after searching while couldn't find information , animationdrawable reference in android developers doesn't work fab's if class child of imageview.

but manage workaround works fine.

the technic used similar 1 exposed on drawableanimation documentation, , using property animation api doc.

first use valueanimator class, , int array containing ids of drawables you're going use in animation. 

    final int[] ids = {r.drawable.main_button_1,r.drawable.main_button_2,r.drawable.main_button_3,r.drawable.main_button_4,r.drawable.main_button_5,r.drawable.main_button_6, r.drawable.main_button_7};     fab = (floatingactionbutton) findviewbyid(r.id.yourfabid);     valueanimator = valueanimator.ofint(0, ids.length - 1).setduration(youranimationtime);     valueanimator.setinterpolator( new linearinterpolator() /*your timeinterpolator*/ );

then set animationupdatelistener, , define change in icon behavior method floatinactionbutton.setimagedrawable(drawable yourdrawable).

yet valueanimator updates default every available frame (depending on load in hardware), don't need redraw icon if drowned why use variable i; once icon has been replace next 1 code wait until time next 1 drowned. (the timing depends on interpolator define) 

valueanimator.addupdatelistener(new valueanimator.animatorupdatelistener() {         int = -1;         @override         public void onanimationupdate(valueanimator animation) {             int animatedvalue = (int) animation.getanimatedvalue();             if(i!=animatedvalue) {                 fab.setimagedrawable(getresources().getdrawable(ids[animatedvalue]));                 = animatedvalue;             }         }     });

also useful when play animation backwards method valueanimator.reverse();

i know not pro solution it's 1 i've figure out work on api's supporting propertyanimation. please if know better solution post here, if not hope post helpful


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