Develop Reference

Expanding animation on view with Nine-Patch as background

I'm trying to create an animation that expands a View from top to bottom.
Like this:
I can't use a ScaleAnimation with pivotY set to 0 because this stretches the Nine-Patch like a normal Bitmap. I need to modify the height of my View.
My current solution: (test is the View reference)
ValueAnimator anim = ValueAnimator.ofInt(test.getMeasuredHeight(), 800);
anim.setInterpolator(new FastOutSlowInInterpolator());
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
ViewGroup.LayoutParams params = test.getLayoutParams();
params.height = (int) animation.getAnimatedValue();
test.setLayoutParams(params);
}
});
anim.setDuration(250).start();
This works perfectly, but it expands the view to both sides:
Does anyone know a way to create such animation? Any help is appreciated.

A solution is to keep your implementation but limit the expansion to bottom by having an element above that won't let your view grow up:
Example:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
...
android:layout_height="100dp"/> //assuming your view starts 100dps from top
<YourView
...
.../>
</LinearLayout>
Since your container is a LinearLayout and the first View(FrameLayout) is 100dp height and above the view you wish to expand, it won't expand it's Height up because it can't overlap an element of the same hierarchy, so it will expand down
It also works if you use RelativeLayout by adding android:below="#id/framelayout_id" to YourView which will also guarantee that YourView doesn't expand up

Add an extra variable that holds initial position on Y axis.
expands top
public void expandTop(final View test) {
final float bottomAnchor = test.getY() + test.getHeight();
final ValueAnimator anim = ValueAnimator.ofInt(test.getMeasuredHeight(), 800);
anim.setInterpolator(new FastOutSlowInInterpolator());
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
ViewGroup.LayoutParams params = test.getLayoutParams();
params.height = (int) animation.getAnimatedValue();
test.setY(bottomAnchor - (int) animation.getAnimatedValue());
test.setLayoutParams(params);
}
});
anim.setDuration(2500).start();
}
expandBottom
public void expandBottom(final View test) {
final float topAnchor = test.getY();
final ValueAnimator anim = ValueAnimator.ofInt(test.getMeasuredHeight(), 800);
anim.setInterpolator(new FastOutSlowInInterpolator());
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
ViewGroup.LayoutParams params = test.getLayoutParams();
params.height = (int) animation.getAnimatedValue();
test.setY(topAnchor);
test.setLayoutParams(params);
}
});
anim.setDuration(2500).start();
}

Why is there no files inside my anim folder? [duplicate]

I want to have a 2 second animation of an ImageView that spends 1000ms fading in and then 1000ms fading out.
Here's what I have so far in my ImageView constructor:
Animation fadeIn = new AlphaAnimation(0, 1);
fadeIn.setDuration(1000);
Animation fadeOut = new AlphaAnimation(1, 0);
fadeOut.setStartOffset(1000);
fadeOut.setDuration(1000);
AnimationSet animation = new AnimationSet(true);
animation.addAnimation(fadeIn);
animation.addAnimation(fadeOut);
this.setAnimation(animation);
When I run that animation, nothing shows up. However, when I remove one of the alpha animations, the behavior works as expected.
Things I have already tried:
Every conceivable combination of setFillBefore, setFillAfter, and setFillEnabled.
Adding a LinearInterpolator to the AnimationSet.

Figured out my own problem. The solution ended up being based in interpolators.
Animation fadeIn = new AlphaAnimation(0, 1);
fadeIn.setInterpolator(new DecelerateInterpolator()); //add this
fadeIn.setDuration(1000);
Animation fadeOut = new AlphaAnimation(1, 0);
fadeOut.setInterpolator(new AccelerateInterpolator()); //and this
fadeOut.setStartOffset(1000);
fadeOut.setDuration(1000);
AnimationSet animation = new AnimationSet(false); //change to false
animation.addAnimation(fadeIn);
animation.addAnimation(fadeOut);
this.setAnimation(animation);
If you are using Kotlin
val fadeIn = AlphaAnimation(0f, 1f)
fadeIn.interpolator = DecelerateInterpolator() //add this
fadeIn.duration = 1000
val fadeOut = AlphaAnimation(1f, 0f)
fadeOut.interpolator = AccelerateInterpolator() //and this
fadeOut.startOffset = 1000
fadeOut.duration = 1000
val animation = AnimationSet(false) //change to false
animation.addAnimation(fadeIn)
animation.addAnimation(fadeOut)
this.setAnimation(animation)

I know that this already has been answered but.....
<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
android:fromAlpha="1.0"
android:toAlpha="0.0"
android:duration="1000"
android:repeatCount="infinite"
android:repeatMode="reverse"
/>
Quick and easy way to quickly do a fade in and out with a self repeat. Enjoy
EDIT :
In your activity add this:
yourView.startAnimation(AnimationUtils.loadAnimation(co‌​ntext, R.anim.yourAnimation));

viewToAnimate.animate().alpha(1).setDuration(1000).setInterpolator(new DecelerateInterpolator()).withEndAction(new Runnable() {
#Override
public void run() {
viewToAnimate.animate().alpha(0).setDuration(1000).setInterpolator(new AccelerateInterpolator()).start();
}
}).start();

Here is my solution using AnimatorSet which seems to be a bit more reliable than AnimationSet.
// Custom animation on image
ImageView myView = (ImageView)splashDialog.findViewById(R.id.splashscreenImage);
ObjectAnimator fadeOut = ObjectAnimator.ofFloat(myView, "alpha", 1f, .3f);
fadeOut.setDuration(2000);
ObjectAnimator fadeIn = ObjectAnimator.ofFloat(myView, "alpha", .3f, 1f);
fadeIn.setDuration(2000);
final AnimatorSet mAnimationSet = new AnimatorSet();
mAnimationSet.play(fadeIn).after(fadeOut);
mAnimationSet.addListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
mAnimationSet.start();
}
});
mAnimationSet.start();

Another alternative:
No need to define 2 animation for fadeIn and fadeOut. fadeOut is reverse of fadeIn.
So you can do this with Animation.REVERSE like this:
AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 1.0f);
alphaAnimation.setDuration(1000);
alphaAnimation.setRepeatCount(1);
alphaAnimation.setRepeatMode(Animation.REVERSE);
view.findViewById(R.id.imageview_logo).startAnimation(alphaAnimation);
then onAnimationEnd:
alphaAnimation.setAnimationListener(new Animation.AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
//TODO: Run when animation start
}
#Override
public void onAnimationEnd(Animation animation) {
//TODO: Run when animation end
}
#Override
public void onAnimationRepeat(Animation animation) {
//TODO: Run when animation repeat
}
});

As I believe in the power of XML (for layouts), this is the equivalent for the accepted answer, but purely as an animation resource:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="#android:interpolator/accelerate_decelerate"
android:fillAfter="true">
<alpha
android:fromAlpha="0"
android:toAlpha="1"
android:duration="1000" />
<alpha
android:fromAlpha="1"
android:toAlpha="0"
android:duration="1000"
android:startOffset="1000"/>
</set>
The fillAfter is for the fade to remain after completing the animation. The interpolator handles interpolation of the animations, as you can guess. You can also use other types of interpolators, like Linear or Overshoot.
Be sure to start your animation on your view:
yourView.startAnimation(AnimationUtils.loadAnimation(co‌​ntext, R.anim.fade));

Here is what I used to fade in/out Views, hope this helps someone.
private void crossFadeAnimation(final View fadeInTarget, final View fadeOutTarget, long duration){
AnimatorSet mAnimationSet = new AnimatorSet();
ObjectAnimator fadeOut = ObjectAnimator.ofFloat(fadeOutTarget, View.ALPHA, 1f, 0f);
fadeOut.addListener(new Animator.AnimatorListener() {
#Override
public void onAnimationStart(Animator animation) {
}
#Override
public void onAnimationEnd(Animator animation) {
fadeOutTarget.setVisibility(View.GONE);
}
#Override
public void onAnimationCancel(Animator animation) {
}
#Override
public void onAnimationRepeat(Animator animation) {
}
});
fadeOut.setInterpolator(new LinearInterpolator());
ObjectAnimator fadeIn = ObjectAnimator.ofFloat(fadeInTarget, View.ALPHA, 0f, 1f);
fadeIn.addListener(new Animator.AnimatorListener() {
#Override
public void onAnimationStart(Animator animation) {
fadeInTarget.setVisibility(View.VISIBLE);
}
#Override
public void onAnimationEnd(Animator animation) {}
#Override
public void onAnimationCancel(Animator animation) {}
#Override
public void onAnimationRepeat(Animator animation) {}
});
fadeIn.setInterpolator(new LinearInterpolator());
mAnimationSet.setDuration(duration);
mAnimationSet.playTogether(fadeOut, fadeIn);
mAnimationSet.start();
}

AnimationSets don't appear to work as expected at all. In the end I gave up and used the Handler class's postDelayed() to sequence animations.

If you use Animator for make animation you can
anim (directory) -> fade_out.xml
<?xml version="1.0" encoding="UTF-8"?>
<objectAnimator
android:propertyName="alpha"
android:valueFrom="0"
android:valueTo="1"
xmlns:android="http://schemas.android.com/apk/res/android"/>
In java
Animator animator = AnimatorInflater.loadAnimator(context, R.animator.fade_out);
animator.setTarget(the_view_you_want_to_animation);
animator.setDuration(1000);
animator.start();
Other way to make animation fade out with only java code is
ObjectAnimator fadeOut = ObjectAnimator.ofFloat(the_view_you_want_to_animation, "alpha", 1f, 0);
fadeOut.setDuration(2000);
fadeOut.start();

You can also use animationListener, something like this:
fadeIn.setAnimationListener(new AnimationListener() {
#Override
public void onAnimationEnd(Animation animation) {
this.startAnimation(fadeout);
}
});

I really like Vitaly Zinchenkos solution since it was short.
Here is an even briefer version in kotlin for a simple fade out
viewToAnimate?.alpha = 1f
viewToAnimate?.animate()
?.alpha(0f)
?.setDuration(1000)
?.setInterpolator(DecelerateInterpolator())
?.start()

Unknown animation name: decelerateInterpolator

Android Studio 1.5
Device Samsung 4.4.2
I am trying to animate items loaded from a ArrayList into a recyclerview. I when the dropdown arrow is clicked the items should animate (decelerate) when expanded and should animate when collapsed. However, currently the list items just appears.
Code that calls the setAnimation
#Override
public void onBindChildViewHolder(ChatChildViewHolder childViewHolder, int position, Object childListItem) {
ChatChildTitles chatChildTitles = (ChatChildTitles)childListItem;
childViewHolder.tvChildTitle.setText(chatChildTitles.getTitle());
setAnimation(childViewHolder.cvChildRooms, position);
}
Code for setting the animation
private void setAnimation(CardView viewToAnimate, int position) {
Animation animation = AnimationUtils.loadAnimation(mContext, android.R.anim.fade_in);
animation.setInterpolator(mContext, android.R.anim.decelerate_interpolator);
viewToAnimate.startAnimation(animation);
}
Here is a couple of screenshots:
In the collapsed state
After the arrow has been clicked expland the list
This is my layout I am using that represents the rows that will be displayed in the recyclerView:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
android:id="#+id/cvChildRooms"
xmlns:card="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card:cardBackgroundColor="#color/child_header_lighter_grey"
card:contentPadding="4dp"
card:cardPreventCornerOverlap="true">
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/profile_image"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_gravity="center_vertical|start"
android:src="#drawable/photorace"/>
<TextView
android:id="#+id/tvChildTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical|center"
android:text="Coffee Latte Room"
android:fontFamily="sans-serif-light"
android:textSize="16sp"
android:textColor="#android:color/black"/>
</android.support.v7.widget.CardView>
I have a function that should start the animation.
private void setAnimation(CardView viewToAnimate, int position) {
Animation animation = AnimationUtils.loadAnimation(mContext, android.R.anim.decelerate_interpolator);
viewToAnimate.startAnimation(animation);
}
I have tested using the following that works ok with slide_in_left. However, I don't want them to slide in from the left
Animation animation = AnimationUtils.loadAnimation(mContext, android.R.anim.slide_in_left);
viewToAnimate.startAnimation(animation);
Many thanks for any suggestions,

If you want to use a decelerate interpolator you need to set it AS an interpolator, not as the animator:
private void setAnimation(CardView viewToAnimate, int position) {
Animation animation = AnimationUtils.loadAnimation(mContext, android.R.anim.fade_in); //change this with your desidered (or custom) animation
animation.setInterpolator(mContext, android.R.anim.decelerate_interpolator);
viewToAnimate.startAnimation(animation);
}
UPDATE
You said that you are using com.bignerdranch.android:expandablerecyclerview:2.0.3.
From the official docs of the library, it's clearly state how to create expand/collapse animations:
You can also create your own animations for expansion by overriding
ParentViewHolder#onExpansionToggled(boolean), which will be called for
you when the itemView is expanded or collapsed.
I suggest you to take a look at the official example of the library.

You can't use decelerate_interpolator because it's not an animation, it is an interpolator:
An interpolator defines the rate of change of an animation. This
allows the basic animation effects (alpha, scale, translate, rotate)
to be accelerated, decelerated, repeated, etc.
Reference:
http://developer.android.com/reference/android/view/animation/Interpolator.html
As you can see the XML that describing them are completely different:
Source of decelerate_interpolator.xml:
<decelerateInterpolator />
Source of slide_in_left.xml:
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="-50%p" android:toXDelta="0"
android:duration="#android:integer/config_mediumAnimTime"/>
<alpha android:fromAlpha="0.0" android:toAlpha="1.0"
android:duration="#android:integer/config_mediumAnimTime" />
</set>

To animate the list as they expand and collapse, consider using an ItemAnimator from android.
You will need to set up a custom itemAnimator, something similar to the one in the link below:
https://gist.github.com/ademar111190/dc988c8d899dae0193f7
Set the itemAnimator in the method runPendingAnimations to your decelerate interpolator.
#Override
public void runPendingAnimations() {
if (!mViewHolders.isEmpty()) {
int animationDuration = 300;
AnimatorSet animator;
View target;
for (final RecyclerView.ViewHolder viewHolder : mViewHolders) {
target = viewHolder.itemView;
target.setPivotX(target.getMeasuredWidth() / 2);
target.setPivotY(target.getMeasuredHeight() / 2);
animator = new AnimatorSet();
animator.playTogether(
ObjectAnimator.ofFloat(target, "translationX", -target.getMeasuredWidth(), 0.0f),
ObjectAnimator.ofFloat(target, "alpha", target.getAlpha(), 1.0f)
);
animator.setTarget(target);
animator.setDuration(animationDuration);
animator.setInterpolator(new DecelerateInterpolator());
animator.setStartDelay((animationDuration * viewHolder.getPosition()) / 10);
animator.addListener(new AnimatorListener() {
#Override
public void onAnimationEnd(Animator animation) {
mViewHolders.remove(viewHolder);
}
});
animator.start();
}
}
}
Then you will need to set the itemAnimator to the recycler view.
recyclerView.setItemAnimator(new MyItemAnimator());

You can use below code for do that.
private void hideViews() {
recyclerView.animate().translationY(-recyclerView.getHeight()).setInterpolator(new AccelerateInterpolator(2));
FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mFabButton.getLayoutParams();
int fabBottomMargin = lp.bottomMargin;
mFabButton.animate().translationY(mFabButton.getHeight()+fabBottomMargin).setInterpolator(new AccelerateInterpolator(2)).start();
}
private void showViews() {
recyclerView.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2));
mFabButton.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2)).start();
}
You can call this method onClick of your Button.
Hope it will help you.

Animation fade in and out

Using this code I only have a fade in, I'm looking for how to add a fade out as well. I've added another xml called "fadeout" but I can't integrate it in my code.
ImageView imageView = (ImageView)findViewById(R.id.imageView);
Animation fadeInAnimation = AnimationUtils.loadAnimation(this, R.anim.fadein);
imageView.startAnimation(fadeInAnimation);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
imageView.startAnimation(fadeInAnimation);
}
}
fadein.xml
<?xml version="1.0" encoding="UTF-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<alpha android:fromAlpha="0.0" android:toAlpha="1.0"
android:interpolator="#android:anim/accelerate_interpolator"
android:duration="Your Duration(in milisecond)"
android:repeatCount="infinite"/>
</set>

Here is my solution. It uses AnimatorSet. AnimationSet library was too buggy to get working. This provides seamless and infinite transitions between fade in and out.
public static void setAlphaAnimation(View v) {
ObjectAnimator fadeOut = ObjectAnimator.ofFloat(v, "alpha", 1f, .3f);
fadeOut.setDuration(2000);
ObjectAnimator fadeIn = ObjectAnimator.ofFloat(v, "alpha", .3f, 1f);
fadeIn.setDuration(2000);
final AnimatorSet mAnimationSet = new AnimatorSet();
mAnimationSet.play(fadeIn).after(fadeOut);
mAnimationSet.addListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
mAnimationSet.start();
}
});
mAnimationSet.start();
}

This is Good Example for Fade In and Fade Out Animation with Alpha Effect
Animate Fade In Fade Out
UPDATED :
check this answer may this help you

I´ve been working in Kotlin (recommend to everyone), so the syntax might be a bit off.
What I do is to simply to call:
v.animate().alpha(0f).duration = 200
I think that, in Java, it would be the following.:
v.animate().alpha(0f).setDuration(200);
Try:
private void hide(View v, int duration) {
v.animate().alpha(0f).setDuration(duration);
}
private void show(View v, int duration) {
v.animate().alpha(1f).setDuration(duration);
}

According to the documentation AnimationSet
Represents a group of Animations that should be played together. The
transformation of each individual animation are composed together into
a single transform. If AnimationSet sets any properties that its
children also set (for example, duration or fillBefore), the values of
AnimationSet override the child values
AnimationSet mAnimationSet = new AnimationSet(false); //false means don't share interpolators
Pass true if all of the animations in this set should use the
interpolator associated with this AnimationSet. Pass false if each
animation should use its own interpolator.
ImageView imageView= (ImageView)findViewById(R.id.imageView);
Animation fadeInAnimation = AnimationUtils.loadAnimation(this, R.anim.fade_in);
Animation fadeOutAnimation = AnimationUtils.loadAnimation(this, R.anim.fade_out);
mAnimationSet.addAnimation(fadeInAnimation);
mAnimationSet.addAnimation(fadeOutAnimation);
imageView.startAnimation(mAnimationSet);
I hope this will help you.

we can simply use:
public void animStart(View view) {
if(count==0){
Log.d("count", String.valueOf(count));
i1.animate().alpha(0f).setDuration(2000);
i2.animate().alpha(1f).setDuration(2000);
count =1;
}
else if(count==1){
Log.d("count", String.valueOf(count));
count =0;
i2.animate().alpha(0f).setDuration(2000);
i1.animate().alpha(1f).setDuration(2000);
}
}
where i1 and i2 are defined in the onCreateView() as:
i1 = (ImageView)findViewById(R.id.firstImage);
i2 = (ImageView)findViewById(R.id.secondImage);
count is a class variable initilaized to 0.
The XML file is :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ImageView
android:id="#+id/secondImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="animStart"
android:src="#drawable/second" />
<ImageView
android:id="#+id/firstImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="animStart"
android:src="#drawable/first" />
</RelativeLayout>
#drawable/first and #drawable/second are the images in the drawable folder in res.

You can do this also in kotlin like this:
contentView.apply {
// Set the content view to 0% opacity but visible, so that it is visible
// (but fully transparent) during the animation.
alpha = 0f
visibility = View.VISIBLE
// Animate the content view to 100% opacity, and clear any animation
// listener set on the view.
animate()
.alpha(1f)
.setDuration(resources.getInteger(android.R.integer.config_mediumAnimTime).toLong())
.setListener(null)
}
read more about this in android docs

Please try the below code for repeated fade-out/fade-in animation
AlphaAnimation anim = new AlphaAnimation(1.0f, 0.3f);
anim.setRepeatCount(Animation.INFINITE);
anim.setRepeatMode(Animation.REVERSE);
anim.setDuration(300);
view.setAnimation(anim); // to start animation
view.setAnimation(null); // to stop animation

FOR FADE add this first line with your animation's object.
.animate().alpha(1).setDuration(2000);
FOR EXAMPLE

Today, I got stuck with this problem. This worked for me:
#JvmStatic
fun setFadeInFadeOutAnimation(v: View?) {
val fadeIn = ObjectAnimator.ofFloat(v, "alpha", 0.0f, 1f)
fadeIn.duration = 300
val fadeOut = ObjectAnimator.ofFloat(v, "alpha", 1f, 0.0f)
fadeOut.duration = 2000
fadeIn.addListener(object : AnimatorListenerAdapter(){
override fun onAnimationEnd(animation: Animator?) {
fadeOut.start()
}
})
fadeIn.start()
}

animation of TextView's text size

I want to be able to do a text animation and change the size of the text in a TextView. I read that there are property animations in android but if someone knows a simple code that can do this for me or an example somewhere I will deeply appreciate it. Thank u in advance!

scale.xml
<?xml version="1.0" encoding="utf-8"?>
<set
xmlns:android="http://schemas.android.com/apk/res/android">
<scale
android:fromXScale="1.0"
android:fromYScale="1.0"
android:toXScale="2.0"
android:toYScale="2.0"
android:duration="3000"></scale>
</set>
A function into an Activity:
private void RunAnimation()
{
Animation a = AnimationUtils.loadAnimation(this, R.anim.scale);
a.reset();
TextView tv = (TextView) findViewById(R.id.firstTextView);
tv.clearAnimation();
tv.startAnimation(a);
}
extracted and modified from here

Animation animation=new TranslateAnimation(0,480,0,0);
animation.setDuration(5000);
animation.setRepeatMode(Animation.RESTART);
animation.setRepeatCount(Animation.INFINITE);
text.startAnimation(animation);
// applying animation to textview object..
If you are using button event to show animation then put the code inside onClick() otherwise use override method onWindowFocusChanged(boolean hasFocus) to start animation

Use ValueAnimator class in the android
final float startSize = o; // Size in pixels
final float endSize = 30;
final int animationDuration = 1000; // Animation duration in ms
ValueAnimator animator = ValueAnimator.ofFloat(startSize, endSize);
animator.setDuration(animationDuration);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
float animatedValue = (float) valueAnimator.getAnimatedValue();
tv.setTextSize(animatedValue);
}
});
animator.start();
refer this link ValueAnimator
Another solution is that apply scale animation on Textview or its parent layout
ScaleAnimation scaleAnimation = new ScaleAnimation(0.7f, 1.1f, 0.7f, 1.1f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f,
ScaleAnimation.RELATIVE_TO_SELF, 0.5f);
scaleAnimation.setDuration(600);
viewZoom.startAnimation(scaleAnimation);