How to apply easing animation function on view in android -

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i want apply translate animation on android view (button).. using custom interpolator..where easing function is:

public static float easeout(float t,float b , float c, float d) {     if ((t/=d) < (1/2.75f)) {        return c*(7.5625f*t*t) + b;     } else if (t < (2/2.75f)) {        return c*(7.5625f*(t-=(1.5f/2.75f))*t + .75f) + b;     } else if (t < (2.5/2.75)) {        return c*(7.5625f*(t-=(2.25f/2.75f))*t + .9375f) + b;     } else {        return c*(7.5625f*(t-=(2.625f/2.75f))*t + .984375f) + b;     } }

i have example uses custom interpolator this:

the intreplator : 

public class hesitateinterpolator implements interpolator {     public hesitateinterpolator() {     }      public float getinterpolation(float t) {         float x = 2.0f * t - 1.0f;         return 0.5f * (x * x * x + 1.0f);     } }

and used :

scaleanimation anim = new scaleanimation(0.0f, 1.0f, 0.0f, 1.0f); anim.setinterpolator(new hesitateinterpolator());

my question is: these values b,c,d ??

according robert penner's easing functions, stated here:

t: current time, b: beginning value, c: change in value, d: duration

if want implement custom interpolator, have make this:

(this implementation easeinoutquint)

public class mvacceleratedecelerateinterpolator implements interpolator {      // easeinoutquint     public float getinterpolation(float t) {         float x;         if (t<0.5f)         {              x = t*2.0f;             return 0.5f*x*x*x*x*x;         }         x = (t-0.5f)*2-1;         return 0.5f*x*x*x*x*x+1;     } }

edit: implement easing function need math knowledge, considering getinterpolation method gets t parameter, 0.0 1.0.

so need develop y(t) function, t 0 1, , y values 0 1, shown below:

enter image description here

what change curve 0 1 (in image green line linear one, example). need 'normalize' easing functions remain in (0, 1) x (0, 1) square, can see in easeinoutquint implementation.


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