Develop Reference

How to apply setColorFilter() with animation?

I have a view, which I want to transform into red color with an animation.
I tried to apply a color filter from 00 alpha color to FF alpha color, but when the animation starts, obviously the image it's transparent for the 00 alpha color filter, so this is not the solution:
ValueAnimator anim = new ValueAnimator();
anim.setIntValues(Color.parseColor("#00EE1B1B"), Color.parseColor("#FFEE1B1B"));
anim.setEvaluator(new ArgbEvaluator());
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
view.setColorFilter((Integer)valueAnimator.getAnimatedValue(), android.graphics.PorterDuff.Mode.MULTIPLY);
}
});
anim.setDuration(4000);
anim.start();
How can I animate a color filter from none to red?

Well finally I discovered that white color filter doesn't modify the view... so simply doing this, the problem is solved:
finalEnemyWeaponColorFilter.setIntValues(Color.parseColor("#FFFFFF"), Color.parseColor("#EE1B1B"));

Android ArgbEvaluator calculate fraction

I've a little difficult in using ArgbEvaluator object.
I want to change the color of view from one color to another color in specific duration.So I write this code,it works well.
ValueAnimator animator = ValueAnimator.ofArgb(Color.RED,Color.BLUE);
animator.setDuration(5000);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
int color = (int) animation.getAnimatedValue();
view.setBackgroundColor(color);
}
});
animator.start();
But I want to use ArgbEvaluator to animate like that.
public void setColor(fraction){
int color = evaluator.evaluate(fraction,startColor,endColor);
view.setBackgroundColor(color);
}
The above setColor method will be called agian and again for specific duration(eg-5000ms).
Here is my problem.
I don't know how to calculate fraction to change color within specific duration.
I want to know the calculation formula of fraction.Thanks.

Fill Imageview background animation

How to fill a image view background such that its transparent area will be filled by some color.
I want to fill below image -
and filled image will be like -
i want to fill black area of image only with animation from bottom to top.
Please suggest some animation by which i can do desire animation.
Thanks in advance

U can try adding it in code
ImageView backgroundImg = (ImageView) findViewById(R.id.backgroundImg);
backgroundImg.setBackgroundColor(Color.rgb(100, 100, 50));
This will also solve your problem. Just add this in your ImageView tag.
android:background="#android:color/red"
Check this Im not sure. But check this snippet
You can simply use ArgbEvaluator which is available since API 11 (Honeycomb):
ValueAnimator anim = new ValueAnimator();
anim.setIntValues(color1, color2);
//anim..setIntValues(Color.parseColor("#FFFFFF"), Color.parseColor("#000000"));
anim.setEvaluator(new ArgbEvaluator());
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
backgroundImg.setBackgroundColor((Integer)valueAnimator.getAnimatedValue());
}
});
anim.setDuration(300);
anim.start();
Even better, beginning with API 21 (Lollipop 5.0) you can replace the first 3 lines in the code above with one:
ValueAnimator anim = ValueAnimator.ofArgb(color1, color2)

FloatingActionButton backgroundTint animation

I'd like to animate the backgroundTint value (and ideally the alpha value too) of a FloatingActionButton, so that the FAB background color continuously switches between two colors.
My noob approach would be to use a timer that calls a function that updates this property when it fires. I'm sure there's a better way of doing this?

I got this to work using ObjectAnimator as suggested by #MH. above, but I had to override the onAnimationUpdate() callback:
final ValueAnimator animator = ValueAnimator.ofInt(Color.rgb(0, 121, 107), Color.rgb(226, 143, 34));
animator.setDuration(2000L);
animator.setEvaluator(new ArgbEvaluator());
animator.setInterpolator(new DecelerateInterpolator(2));
animator.addUpdateListener(new ObjectAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
int animatedValue = (int) animation.getAnimatedValue();
fab.setBackgroundTintList(ColorStateList.valueOf(animatedValue));
}
});
animator.start();

ValueAnimator Helper Class

I am a beginner in Android development.
Coming from iOS background I tend to use animations on Views
to animate a View in Android. I have found out to do it in a "normal" way
For example to animate alpha value of a view
valueAnimator = ValueAnimator.ofFloat(0, 100);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
float value = (Float) animation.getAnimatedValue();
viewToAnimate.alpha(value);
}
});
valueAnimator.setDuration(10000);
valueAnimator.start();
I am wondering if there is an easy way. Perhaps create a "Helper" class to animate an objects alpha value. Where we can pass in the View to animate and have it animated.
Something like AnimationHelper.animateAlpha(viewToAnimate, OF_VALUE, TO_VALUE, DURATION);
I am sorry to ask this question. Since my Java knowledge is rusty, I am wondering if there is any kind folks out there who is willing to help out.
Thank you

Try this:
viewToAnimate.animate().alpha(TO_VALUE).setDuration(DURATION);
or this:
ObjectAnimator anim = ObjectAnimator.ofFloat(viewToAnimate, "alpha", FROM_VALUE, TO_VALUE);
anim.setDuration(DURATION);
anim.start();