Develop Reference

Circular Reveal animation onTouch Android

I'm trying to implement a circular reveal animation which consist to reveal the view according the user finger when he's touching the view.
First, my view is inside an infinite circular reveal loop to keep the rounded aspect as long as the user do nothing.
Then when the user touch the view and start to swipe I calculated a factor inside the ACTION_MOVE to increase the radius in real time and call the circular reveal at each pass.
public void reveal(final View view,
final float centerX,
final float centerY,
final float startRadius,
final float endRadius,
final int duration) {
anim = ViewAnimationUtils.createCircularReveal(view, (int)centerX, (int)centerY, (int)startRadius, (int)endRadius);
anim.setDuration(duration);
anim.addListener(new Animator.AnimatorListener() {
#Override
public void onAnimationStart(Animator animation) {
}
#Override
public void onAnimationEnd(Animator animation) {
if (isRepeating) {
reveal(view,centerX,centerY,startRadius,endRadius,duration);
}
}
#Override
public void onAnimationCancel(Animator animation) {
}
#Override
public void onAnimationRepeat(Animator animation) {
}
});
anim.start();
}
I recall the circular reveal method again inside its Listener to create the loop and the most important to avoid visual distortion.
I have noticed that if I didn't do this way some very fast distortion showed up because the animation duration is faster than each pass in ACTION_MOVE so the anim have time to finish before the next pass.
The distortion is the representation of the missing part of the view when the animation is finished and came back very fast to the current radius set with the Touch like a flash.
So this way with the method recall inside the Listener is working great until there.
Problem : On one of my devices there are senseless distortion in all directions while swiping.
According to my logs it's not a radius distortion because the start and end radius is always the same after each pass so the radius should not be moving like this especially when the finger is stopped, and the animation never stop thanks to the Listener like I explained above.
What am I doing wrong ?
I searched a lot and didn't find the same problem so I tried other ways like drawing canvas but unfortunately it doesn't match with my needs.
Is there another way to achieve this kind of animation even completely differently ?
Any lead is appreciate thanks in advance
EDIT : inside the ACTION_MOVE
scaleRadius = (float) (2 * distance / maxWidth + startScale);
if (scaleRadius < 1) {
scaleRadius = 1;
}
animator.reveal(this, middleCircleX, middleCircleY,
initialCircleRadius*scaleRadius, initialCircleRadius*scaleRadius, 0);
Logs : Always the same factor then the radius should not move because my finger is stopped
2020-03-27 15:42:56.113 onTouch: scaleRadius 1.7870371
2020-03-27 15:42:56.113 onTouch: scaleRadius 1.7870373
2020-03-27 15:42:56.227 onTouch: scaleRadius 1.7870371
2020-03-27 15:42:56.227 onTouch: scaleRadius 1.7870373
2020-03-27 15:42:56.331 onTouch: scaleRadius 1.7870374
2020-03-27 15:42:56.331 onTouch: scaleRadius 1.7870371

I am assuming that you dont want the flickering animation but rather that the radius of your circe transitions smoothly and becomes either bigger or smaller as a function of how far you swipe on the screen. (please correct me if this assumption is wrong)
I will assume that centerX and centerY are always the same value and are basically global variables.
Create a couple of additional global variables:
boolean animIsCurrentlyPlaying=false;
float mCurrentRadius=initialCircleSize; //i guess this is 1 in your case
float mTargetRadius;
Now on the ACTION_MOVE event you will do the following:
1- set mTargetRadius to be some function of the distance between centerX and centerY and the position of the finger on the screen (euclidean distance might be a good pick here is an example);
mTargetRadius=Float.valueOf(Math.sqrt((double)(Math.pow(event.getX()-centerX,2)+Math.pow(event.getY()-centerY,2))));
2- excecute the following method revealModified(view, 100);
public void revealModified(final View view,
final int duration) {
if(!animIsCurrentlyPlaying){
//here i just reference the global vars
anim = ViewAnimationUtils.createCircularReveal(view, centerX, centerY, mCurrentRadius, mTargetRadius);
mCurrentRadius=mTargetRadius;
anim.setDuration(duration);
anim.addListener(new Animator.AnimatorListener() {
#Override
public void onAnimationEnd(Animator animation) {
animIsCurrentlyPlaying=false;
if(mCurrentRadius!=mTargetRadius){
revealModified(view, 100);
}
}
});
animIsCurrentlyPlaying=true;
anim.start();
}
}
the method will be excecuted every time you move your finger ever so slightly. I set the duration to 100 ms but that can be shorter if you find its not reactive enough. anytime you move your finger a flag is set so no other animations can be started on top and the transition is always smooth.if you move your finger while an anim is playing then revealModified will be reexecured in the if statement within onAnimationEnd.
let me know if it works and especially if this is what you wanted

How to move a view to another view using animation in Android?

I have a circle at the center of the screen inside which there's an ImageView + TextView. I have another two ImageView+TextView, one at the top and another at bottom of the screen.
My requirement is :
I want a copy of the top ImageView+TextView and a copy of the bottom ImageView+TextView to move in animation into the center of the circle, thereby changing the value of the textView inside the circle.
For example:
Say top textView has value 200 and bottom textview has value 300. I want a portion of those values (say 100 or 150) to animate and move into the circle, but the original values 200 and 300 should remain on the same position.
I've tried using TranslateAnimation. However I face issues finding the x and y coordinates of the center circle. It is not exactly going to the center of the circle. Also original view's position is not retained.
TranslateAnimation animation = new
TranslateAnimation(startLayout.getX(),endLayout.getX(),
startLayout.getY(),endLayout.getY);
animation.setDuration(1000);
animation.setFillAfter(false);
startView.startAnimation(animation);
startLayout is the linearlayout in which ImageView and TextView reside.
Please help! Thanks!

I had the same issue and I fixed by using the next code (sorry is in Kotlin, but works the same in Java).Let's say viewFirst wants to reach viewTwo position:
(DON'T USE):
viewFirst.animate()
.translationX(viewSecond.x)
.translationY(viewSecond.y)
.setDuration(1000)
.withEndAction {
//to make sure that it arrives,
//but not needed actually these two lines
viewFirst.x = viewSecond.x
viewFirst.y = viewSecond.y
}
.start()
(USE THIS SOLUTION):
viewFirst.animate()
.x(viewSecond.x)
.y(viewSecond.y)
.setDuration(1000)
.withEndAction {
//to make sure that it arrives,
//but not needed actually these two lines
viewFirst.x = viewSecond.x
viewFirst.y = viewSecond.y
}
.start()

Using the getX() and getY() methods define the position of the view in pixels, but the constructor you use defines Float type values that must be values from 0.0f to 1.0f
TranslateAnimation(float fromXDelta, float toXDelta, float fromYDelta, float toYDelta)
This is another option using the view`s position in pixels:
viewFirst.animate()
.x(viewSecond.getX())
.y(viewSecond.getY())
.setDuration(1000).withEndAction(new Runnable() {
#Override
public void run() {
viewFirst.setX(tv2.getX());
viewFirst.setY(tv2.getY());
}
}).start();

Try this for accurate coordinates
private fun moveView(viewToBeMoved: View, targetView: View) {
val targetX: Float =
targetView.x + targetView.width / 2 - viewToBeMoved.width / 2
val targetY: Float =
targetView.y + targetView.height / 2 - viewToBeMoved.height / 2
viewToBeMoved.animate()
.x(targetX)
.y(targetY)
.setDuration(2000)
.withEndAction {
targetView.visibility = View.GONE
}
.start()
}

Change image height with delay animation

I'm using LibGDX engine in my game and I started to use Tween for animation:
I have in my game a small 'custom' progress bar. One image is an empty progress bar and the second is full one, they booths have the same width and height.What I do is I update it by setting the position of the full as the same as the empty, and when I want to display progress I use:
private Image fullProgress; //its a libGDX image type
//I have already set the process
float originalHeight = progressEmpty.getHeight();
howMuchProgress = originalHeight * process;
fullProgress.setHeight(howMuchProgress);
Any ideas how can I make it change the height with delay animation, so I can see it for a few seconds? better will be to use the Tween Engine?

Given your code example, delay should already be calculated in the process.
If you need to visualize the delay just for the debugging purposes (for example, for faking the AssetManager's loading progress), I suggest you do something like this:
private static final float LOADING_MIN_TIME= 2.0f; // delay amount in seconds
private float loadingTimer;
#Override
public void render(float delta) {
// ...
loadingTimer += delta;
float loadingTimerScaled = loadingTimer / LOADING_MIN_TIME;
if (loadingTimerScaled >= 1.0f) {
loadingTimerScaled = 1.0f;
}
process = Math.min(process, loadingTimerScaled); // use the slow(fake) value.
}

Android ValueAnimator pauses during repeat

So I'm using a ValueAnimator to animate a stick figure's limbs from one position to another, in an infinite loop, or at least until the animation is stopped. My problem is that when the animator repeats I have a slight pause as if the animation is lagging behind, but it only happens when the animation repeats. I have other animations that only happen once and those run perfectly smoothly, and they have just as much computation each time so I'm currently thinking that it's a problem with the ValueAnimator.
In the past I was able to find other people complaining about this problem, but I haven't been able to find anyone who has found a solution. Do you guys know if this is a real problem with the Android ValueAnimator? If so, do you know of any solutions? If not, do you guys have any ideas as to why this could be happening to me in just that one place in the animation? I'm really stuck on this one.
My code for the ValueAnimator setup is this:
mFigureAnimator = ValueAnimator.ofFloat(0f, 1f);
mFigureAnimator.setInterpolator(new LinearInterpolator());
mFigureAnimator.setDuration(1000);
mFigureAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
public void onAnimationUpdate(ValueAnimator animation) {
Float delta = (Float)animation.getAnimatedValue();
// Set the drawn locations based on the animated time and the start/end
invalidate();
}
});
mFigureAnimator.setRepeatCount(ValueAnimator.INFINITE);
mFigureAnimator.setRepeatMode(ValueAnimator.RESTART);
mFigureAnimator.start();

for Animation, you can configure the interpolator as LinearInterpolator in the animation file :
android:interpolator="#android:anim/linear_interpolator"
for Animator, LinearInterpolator also work for me, I had a rotate animator, do 360 degrees rotation and repeat infinite:
public class RotateAnimator {
private float mDegrees;
private ObjectAnimator mAnim;
private RotateAnimator() {
mAnim = ObjectAnimator.ofFloat(this, "degrees", 360);
mAnim.setInterpolator(new LinearInterpolator());
mAnim.setRepeatCount(ValueAnimator.INFINITE);
mAnim.setRepeatMode(ValueAnimator.INFINITE);
mAnim.setEvaluator(new FloatEvaluator());
mAnim.setDuration(2000);
mAnim.start();
}
public float getDegrees() {
return mDegrees;
}
public void setDegrees(float degrees) {
this.mDegrees = degrees;
// invalidate the view so it can redraw itself
invalidate();
}
}
that way solved my problem, if you couldn't find another solution, hope this can help you, good luck.

android: move to touch location after release with libgdx/universal-tween-engine

I'm learning to use libgdx with universal-tween-engine and haven't been able to figure out how to touch (or click on the desktop app) a point on the screen and have a texture move all the way to the touched location without keeping the touch or click active until the end-point is reached.
When the touch event is initiated, the animation begins and the graphic moves towards the location. The graphic will follow the finger/mouse-pointer if a touch and drag is initiated. If I touch a point, the graphic will move towards the point until the touch is released. Then it stops where it was when touch is released.
I'm looking to touch-and-release and have that graphic move to the touched point, and am probably not understanding something about the tween engine implementation. I've pasted the tweening code below.
public void render() {
camera.update();
batch.setProjectionMatrix(camera.combined);
batch.begin();
batch.draw(texture.getTexture(), texture.getBoundingBox().x, texture.getBoundingBox().y);
batch.end();
Tween.registerAccessor(Plane.class, new TextureAccessor());
TweenManager planeManager = new TweenManager();
float newX = 0;
float newY = 0;
boolean animateOn = false;
if(Gdx.input.isTouched()) {
newX = Gdx.input.getX();
newY = Gdx.input.getY();
animateOn = true;
}
if (animateOn == true && (texture.getX() != newX || texture.getY() != newY)) {
Tween.to(texture, TextureAccessor.POSITION_XY, 10)
.target(newX, newY)
.ease(TweenEquations.easeNone)
.start(planeManager);
planeManager.update(1);
if (texture.getX() == newX && texture.getY() == newY) {
animateOn = false;
}
}
}
Originally, I had the tweening code inside the conditional for isTouched() and didn't use the newX, newY or animateOn variables. I thought using isTouched() to only set the new coordinates and animation state would then make the loop trigger the tween. The older code looked like this:
if(Gdx.input.isTouched()) {
newX = Gdx.input.getX();
newY = Gdx.input.getY();
Tween.to(texture, TextureAccessor.POSITION_XY, 10)
.target(newX, newY)
.ease(TweenEquations.easeNone)
.start(planeManager);
planeManager.update(1);
}
I've also tried using justTouched(), but the graphic would only move very slightly toward the touched point.
I've been struggling with this for a few hours, I'd really appreciate it if anyone could point me in the right direction.
Thanks.

Tween.registerAccessor(Plane.class, new TextureAccessor());
TweenManager planeManager = new TweenManager();
These two lines should go in the create() method, not the render() one! Here, you're instantiating a new manager on every frame, you only need one manager, that's all, not an army of them!
Also, you need to update the manager on every frame, not just when animateOn is true, else you'll need to keep your finger pressed...
The correct code is as follows, learn from it, you'll get a better understanding of how the Tween Engine works :)
// Only one manager is needed, like a Spritebatch
private TweenManager planeManager;
public void create() {
Tween.registerAccessor(Plane.class, new TextureAccessor());
planeManager = new TweenManager();
}
public void render() {
// The manager needs to be updated on every frame.
planeManager.update(Gdx.graphics.getDeltaTime());
camera.update();
batch.setProjectionMatrix(camera.combined);
batch.begin();
batch.draw(texture.getTexture(), texture.getBoundingBox().x, texture.getBoundingBox().y);
batch.end();
// When the user touches the screen, we start an animation.
// The animation is managed by the TweenManager, so there is
// no need to use an "animateOn" boolean.
if (Gdx.input.justTouched()) {
// Bonus: if there is already an animation running,
// we kill it to prevent conflicts with the new animation.
planeManager.killTarget(texture);
// Fire the animation! :D
Tween.to(texture, TextureAccessor.POSITION_XY, 10)
.target(Gdx.input.getX(), Gdx.input.getY())
.ease(TweenEquations.easeNone)
.start(planeManager);
}
}

I was trying to implement this behavior in the wrong way. Instead of using isTouched or justTouched(), I needed to use touchDown() from GestureListener.
I created a class that implemented GestureDetector (call it touchListener())inside of my main class (the one that implements ApplicationLisetener )in the main libgdx project and put the x and y capturing code inside of toucDown (I noticed tap() was also being triggered). I moved the tween functions (the actual tweening, the call to registerAccessor(), and the creation of the new tween manager) into the update() method of touchListener().
I added a call to touchListener()'s update function inside the render() loop of the main libgdx class.
I doubt I did this is the best way, but I hope it's helpful to someone else in the future.