I created two short methods to help me to show or hide a view when a certain checkbox is checked.
I have a Init method, in which I initialize a checkbox and a view, and a toggle method that is called from inside the checkbox status change listener and toggle the view status with an animation.
void toggleViewVisibility(final boolean b, final View v) {
v.setAlpha(b ? 0.0f : 1.0f);
v.setTranslationY(b ? v.getHeight() : 0);
if (b) {
v.setVisibility(View.VISIBLE);
v.animate().alpha(1.0f).translationY(0).setDuration(400);
} else {
v.animate().alpha(0.0f).translationY(v.getHeight()).setDuration(400).setListener(new Animator.AnimatorListener() {
#Override public void onAnimationStart(Animator animator) {}
#Override public void onAnimationEnd(Animator animator) { v.setVisibility(View.GONE); }
#Override public void onAnimationCancel(Animator animator) {}
#Override public void onAnimationRepeat(Animator animator) {}
});
}
}
void toggleViewVisibilityInit(final boolean b, final View v, final AnimateCheckBox c) {
v.setAlpha(b ? 1.0f : 0.0f);
v.setTranslationY(b ? 0 : v.getHeight());
v.setVisibility(b ? View.VISIBLE : View.GONE);
c.setChecked(b);
}
It works fine with the alpha animation, but has a small problem with the translation animation, although they are treated and initialized in the exact same way. Why?
In particular, the translation works fine whenever the checkbox status changes, but when the checkbox starts off, so the view is invisible, only at the VERY FIRST status change the view appears with alpha animation but does not perform the translation animation.
It looks like that when the view has been just created, it's translation status is not initialized, while alpha status is, although it is done in the toggleViewVisibilityInit() method.
Does anybody know why this should happen? It looks like as soon as the view is created the translation is not taken into consideration.
The view is not yet drawn so it's height is unknown (thus equals 0).
If you know this, it is easy to look for solutions, eg. getWidth() and getHeight() of View returns 0
Hope this helps!
Related
I want to make some views in my app visible and some other views invisible when some animated value of those views is more than a specific value (say, 0.5f).
Something like this:
#Override
public void onAnimationUpdate(ValueAnimator animation) {
if((float)animation.getAnimatedValue() >= 0.2){
(View)animation.setVisibility(View.GONE); //Something like this
}
}
As you know, setVisibility() function doesn't work!
How can I achieve this?
Here you are trying to set visibility of ValueAnimator. This wont work.
Try changing the visibility of actual views instead of ValueAnimator.
#Override
public void onAnimationUpdate(ValueAnimator animation) {
if((float)animation.getAnimatedValue() >= 0.2){
viewToBeMadeInvisible.setVisibility(View.GONE); //Like this
}
}
Update: You could add AnimatorListenerAdapter to listen for animation end.
animation.addListener(new AnimatorListenerAdapter()
{
#Override
public void onAnimationEnd(Animator animation)
{
//set your visibility code here.
}
});
I have an ImageView with alpha=0 by default. So it acts as an invisible overlay on another image.
On click, I want to create an animation that shows the overlay image for 200ms, and then hides it again.
The following does work in general, but only a single time! Why?
final ImageView flash = (ImageView) view.findViewById(R.id.flash);
flash.animate()
.alpha(255) //make visible
.setDuration(200)
.setListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
flash.setImageAlpha(0); //hide again
}
});
you're setting 2 different alpha values, the first one is View's alpha, but when you end the animation you set the ImageView class alpha to 0, so if you start the animation again, the View alpha is 1.0f but the image alpha will be 0 and you see nothing.
change it to
flash.animate()
.alpha(1.f)
.setDuration(200)
.setListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
flash.setAlpha(0.f);
}
});
View (and therefore ImageView) has a method setAlpha(float), ImageView adds also another method setAlpha(int), which is deprecated because it's confusing as hell and now it's been renamed to setImageAlpha(int). the animation will call View's setAlpha(float)
probably another rhetorical question.
In iOS when we set a view's (any any UIView subclass such as UIButton) alpha to 0, iOS by default disables all user interaction on that view.
I got an Android app where I animate fade out the view by:
ObjectAnimator fadeOut = ObjectAnimator.ofFloat(buttonSelectionContainer, "alpha", 1, 0);
fadeOut.setDuration(500);
fadeOut.start();
However, I am noticing that when I tap the screen, the animation starts again, leading me to believe, in Android, even when a button alpha is set to 0, it is still tappable, is this true?
Is there a way to globally tell Android to disable user interaction for a view (and all its subviews) when its alpha is set to 0, either explicitly through using:
view.setAlpha(0.0f);
or through the ObjectAnimator like the above code block I used ?
A temporary work around for my problem would probably be to schedule this code to run after 500 ms:
// psuedocode: after 500ms
dispatch_doSomethingAfter(500)
{
myButton.setEnabled(false);
}
Not the ideal solution but might be my only solution, unless some bright Android developers out there has a better solution ?
Use addListener on your ObjectAnimator to control what happens after the animation has finished.
fadeOut.addListener(new Animator.AnimatorListener() {
#Override
public void onAnimationStart(Animator animation) {
}
#Override
public void onAnimationEnd(Animator animation) {
button.setEnabled(false);
}
#Override
public void onAnimationCancel(Animator animation) {
}
#Override
public void onAnimationRepeat(Animator animation) {
}
});
You can create an Animator.AnimatorListener that automatically disables the target View when the animation ends.
Declare your custom DisableViewOnEndAnimatorListener class:
public class DisableViewOnEndAnimatorListener extends AnimatorListenerAdapter {
#Override
public void onAnimationEnd(Animator animation) {
if (animation instanceof ObjectAnimator) {
final Object target = ((ObjectAnimator) animation).getTarget();
if (target instanceof View) {
((View) target).setEnabled(false);
}
}
}
}
Then, in your code:
DisableViewOnEndAnimatorListener endAnimatorListener = new DisableViewOnEndAnimatorListener();
ObjectAnimator button1FadeOut = ObjectAnimator.ofFloat(button1, "alpha", 1, 0);
button1FadeOut.setDuration(500);
button1FadeOut.addListener(endAnimatorListener);
button1FadeOut.start();
ObjectAnimator button2FadeOut = ObjectAnimator.ofFloat(button2, "alpha", 1, 0);
button2FadeOut.setDuration(500);
button2FadeOut.addListener(endAnimatorListener);
button2FadeOut.start();
I am doing an animation inside a fragment.
I have 2 views on top of each other, one of them set on View.GONE.
when I press a button I want my 2nd fragment to translate animation from the bottom to top.
I am doing it fine and it's working great,
the problem is that in my first run, the xml view is gone, but he is in the same Y he is suppose to be.
so the first animation I do isn't doing anything, just switch from GONE to VISIBLE, after that, I press dismiss and the fragment goes away and comes back just like I want too.
my problem is just the first run.
how can I set my view Y to be 100% below my screen?
here's the code I use :
private void moreCustomAnimation() {
int yOffset = moreMenuFrameLayout.getMeasuredHeight();
TranslateAnimation moveAnim = new TranslateAnimation(0, 0, yOffset, 0);
moveAnim.setDuration(500);
moveAnim.setFillAfter(true);
blackView.setVisibility(View.VISIBLE);
moreMenuFrameLayout.setVisibility(View.VISIBLE);
moreMenuFrameLayout.startAnimation(moveAnim);
moveAnim.setAnimationListener(new Animation.AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
}
#Override
public void onAnimationEnd(Animation animation) {
}
#Override
public void onAnimationRepeat(Animation animation) {
}
});
}
on the way out of the screen I use the same code just switch the
yOffset to the other Y integer, and set the view to GONE at animation end.
thanks a lot in advance for any help !
You can use the onGlobalLayout event to set the position of the view.
Like this:
moreMenuFrameLayout.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
#Override
public void onGlobalLayout() {
moreMenuFrameLayout.setTranslationY(moreMenuFrameLayout.getMeasuredHeight());
moreMenuFrameLayout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
});
This event happens when your views get their actual size and position before being drawn to the screen. However, they happen every time the view is drawn so you must remember to remove the listener right after the first time.
HTH
First time you can add the 'yOffset' value to the view orginal points
moreMenuFrameLayout.setY(currentYpostition + yOffset)
and this will place the view to the bottom of the screen. You can enable the visibility when the animation starts.
In android 5.0 i am trying to work with circular reveal animation
Problem
When i click on button to start reveal animation, on first click animation doesn't start
Second Click onwards it works normally
My Code
public class MainActivity extends ActionBarActivity {
Animator a;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final View cardType = findViewById(R.id.cardtype);
cardType.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
a = ViewAnimationUtils.createCircularReveal(cardType,
cardType.getWidth(),
cardType.getHeight(),
0,
cardType.getHeight() * 2)
.setDuration(2500);
a.addListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
cardType.setVisibility(View.VISIBLE);
}
});
a.addListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
cardType.setVisibility(View.GONE);
}
});
findViewById(R.id.icon_first_activity).setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
a.start();
}
});
}
}}
I haven't tried your code, but I think you have a small ordering problem. I think you just need to set the cardType visible before you start the animation.
Edited to add:
... and you should be setting your button View.INVISIBLE, not View.GONE.
Here: This code works.
Edited once more to add:
Yes. Your problem is that you set the view GONE initially. That means it has 0 size. Then you use cardType.getHeight and cardType.getWidth as reveal coordinates. They are 0. You are going to want to set the view INVISIBLE, initially, and then use width/2 and height/2 as the center of the reveal.
Basically what others answers say, it's correct, but the problem is if you want visibility GONE (because your layout requires it GONE!) you have to set visibility INVISIBLE in the xml with height 0dp (and/or width 0dp as well) and programmatically set the correct LayoutParams even inside the click event it will work. For example my code:
...
expandButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//To not have empty scroll, the container is INVISIBLE with 0dp height.
//Otherwise the Reveal effect will not work at the first click.
//Here I set the parameters programmatically.
viewContainer.setLayoutParams(new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
if (viewContainer.getVisibility() == View.VISIBLE) {
expandButton.animate().rotation(0f).setDuration(duration).start();
Utils.unReveal(viewContainer, 0, 0);
} else {
expandButton.animate().rotation(180f).setDuration(duration).start();
Utils.reveal(viewContainer, viewContainer.getWidth(), 0);
}
}
});
...
#TargetApi(VERSION_CODES.LOLLIPOP)
public static void reveal(final View view, int cx, int cy) {
if (!hasLollipop()) {
view.setVisibility(View.VISIBLE);
return;
}
//Get the final radius for the clipping circle
int finalRadius = Math.max(view.getWidth(), view.getHeight());
//Create the animator for this view (the start radius is zero)
Animator animator =
ViewAnimationUtils.createCircularReveal(view, cx, cy, 0, finalRadius);
//Make the view VISIBLE and start the animation
view.setVisibility(View.VISIBLE);
animator.start();
}
#TargetApi(VERSION_CODES.LOLLIPOP)
public static void unReveal(final View view, int cx, int cy) {
if (!hasLollipop()) {
view.setVisibility(View.GONE);
return;
}
//Get the initial radius for the clipping circle
int initialRadius = view.getWidth();
//Create the animation (the final radius is zero)
Animator animator =
ViewAnimationUtils.createCircularReveal(view, cx, cy, initialRadius, 0);
//Make the view GONE when the animation is done
animator.addListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
view.setVisibility(View.GONE);
}
});
//Start the animation
animator.start();
}
If you set only GONE in the xml, the first time will never work because height/width/x/y/etc.. are 0. Also, if you just set INVISIBLE before the call to the animation it will not work as well, but if you start with visibility INVISIBLE it will initialize the layout params.
what i did is, Like i have two view with same height,As we now visibility gone returns 0 {height and width} than i am giving visible view height every time and its work for me.
The solution is don't get values directly into code
Either put the animation code on click and the values outside onclick
or get the values from other activity
By values i mean cardType.getWidth() and cardType.getHeight()