I'm looking to implement an animation that will slide open or expand a ListView in android. At the moment, I'm using a scale animation (shown below)
Animation slideDown = new ScaleAnimation(1.0f, 1.0f, 0.0f, 1.0f);
slideDown.setDuration(1000);
but this doesn't work for 2 reasons:
1) I want the first item to fade in, and then the list to drop down. If I do a fade in animation, the entire list shows up and then jumps back up to the top and scales down to full size
2) I'm not really looking to scale, I would like to just reveal the ListView by animating down the bottom (if that makes sense).
Is there a way that I can do a TranslateAnimation on just the bottom margin or something similar? I looked into the drawable Clip resource, but that didn't seem to fit my needs here (I'm not sure how to apply it to a ListView). And I'm using a normal ListView, not an ExpandableListView, because I just have one group of items.
So I started searching for different things and it turns out that animating the height was my solution. Essentially I start with a dummy object in the list (so that it has at least 1 row), then I animate it from the height of that row to the height of the full list. Below is the code for the runnable that I am now calling.
private Runnable slideDownList1 = new Runnable() {
#Override
public void run() {
final ListView detail = (ListView)getView().findViewById(R.id.detail_menu_1);
ValueAnimator va = ValueAnimator.ofInt(detail.getHeight(), detail.getHeight()*mItem.containedObjects.size());
va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
public void onAnimationUpdate(ValueAnimator animation) {
Integer value = (Integer) animation.getAnimatedValue();
detail.getLayoutParams().height = value.intValue();
detail.requestLayout();
}
});
va.setDuration(1000);
va.start();
}
};
The XML is just a basic ListView with the id of detail_menu_1.
The new element Recycler View include animations. You can use it with Support Library
https://developer.android.com/training/material/lists-cards.html
Related
I am running into an issue where I have a header view that I would like to translate in and out of visibility--using translate animation--that is positioned directly above the main content view. To illustrate what I mean, look at the image below. The blue section is the header, and the orange section is the main content.
Example code
TranslateAnimation animation = new TranslateAnimation(0, 0, 0, -rlInfoBar.getHeight());
animation.setFillAfter(true);
animation.setDuration(10000);
animation.setAnimationListener(new TranslateAnimation.AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
}
#Override
public void onAnimationEnd(Animation animation) {
}
#Override
public void onAnimationRepeat(Animation animation) {
}
});
rvItems.startAnimation(animation);
rlInfoBar.startAnimation(animation);
When I translate the blue section, even though the main section is declared "android:layout_below="#+id/" it remains in position. My idea was to then translate them both, however, when doing that the main content is shifted up but the bottom of the screen is also shifted up revealing the background of the parent view. How to solve this issue? Do I have to translate both views plus stretch the main content view or somehow anchor the main content view to the bottom of the screen?
Result of translating both views
Do I have to translate both views plus stretch the main content view or somehow anchor the main content view to the bottom of the screen?
Well, if you don't stretch the main content View then anchoring it to the bottom will cause a gap to appear at the top as soon as the header View moves up. So I think you'll need a set of animations (scale and translate) for it.
Or you use the Transition framework, in this case a ChangeBounds transition will do the job for both Views
View sceneRoot = <someViewGroupContainingBothViews>;
TransitionManager.beginDelayedTransition(sceneRoot, new ChangeBounds());
rlInfoBar.setY(<newY_CoordinateOfHeaderView>);
I have a View that has an OnClickListener. When clicked, the view translates up to a certain position on the page. This is no problem, the view goes where it should. When the view is clicked again, I would like to position it somewhere else, but this is not the case. After a little bit of trouble shooting, I found that my View's getTop() method returns the same value - even after the translation animation has moved the view to a different part of the screen. For the second animation, it is not using the current position (as I would expect), it instead uses the initial position.
Few things that I am doing: I am using the ObjectAnimation class rather than the TranslationAnimation class, since I wanted to keep the OnClickListener functioning. With the TranslationAnimation class, I found that the view was correctly moved, but the OnClickListener was only working in the area that the View started from. Using the ObjectAnimation class, I was able to easily get the translation to work AND the OnClickListener functions correctly - it is triggered where the view currently is on the screen.
Here's what I have so far:
final LinearLayout child = layouts.get(i); //ArrayList containing some dynamic layouts
final int offset = target - child.getTop();
ObjectAnimator anim = ObjectAnimator.ofFloat(child,"translationY",offset);
anim.setDuration(250);
anim.start();
This is what happens when the view is clicked the first time. It translates up along the Y axis, where the offset determines how far the View needs to move from its current position.
Now, here's what happens on the second click. The goal here was to align the view with the parent's base.
target = parent.getBottom();
offset = target - child.getTop();
anim = ObjectAnimator.ofFloat(child, "translationY",offset);
anim.setDuration(250);
anim.start();
prev = child;
This is where things fall apart - child.getTop() returns the Y coordinate of the view's ORIGINAL position. Not the current position. So after the animation, the view is placed well below the bottom of the parent. I read a different question which stated that I should use child.getY() instead, which is supposed to give me the translationY position plus the top position, but this didn't lead to any better results. I can't seem to get this to work just right. I'd simply like to move the view from its current position to the bottom of the screen, but this appears to be a hard thing to accomplish. Any help would be appreciated.
EDIT
I have added an animation listener:
ObjectAnimator anim = ObjectAnimator.ofFloat(child,"translationY",offset);
anim.setDuration(250);
anim.addListener(new ObjectAnimator.AnimatorListener(){
#Override
public void onAnimationStart(Animator animation) {
System.out.println("start: " + child.getTop() + " " + child.getY());
}
#Override
public void onAnimationEnd(Animator animation) {
System.out.println("end: " + child.getTop() + " " + child.getY() + " " + child.getTranslationY());
child.setTop((int)child.getY());
System.out.println(child.getTop());
}
#Override
public void onAnimationCancel(Animator animation) {}
#Override
public void onAnimationRepeat(Animator animation) {}
});
anim.start();
Here I am setting the listener to try to change where the Top of the view is located. Behaviour is again not working as expected. The view is actually sent up above the screen when I do this. Output of the System.out looks like this:
start: 2008 2008.0
end: 2008 478.0 -1530.0
478
So calling child.getTop() after the animation is complete and setting a new position returns a positive integer, but the view is not actually completely on screen. It is above the screen, partly visible. The height of the view itself is about 700px. I am still so confused as to why this is such a hard thing to accomplish.
EDIT 2
I have also tried setting layoutparams inside the onAnimationEnd method:
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)child.getLayoutParams();
params.removeRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
params.addRule(RelativeLayout.ALIGN_PARENT_TOP, RelativeLayout.TRUE);
params.topMargin = (int)child.getY();
child.setLayoutParams(params);
Result: child.getTop() still returns the original position of 2008.
You can get the very bottom of the screen coordinates like this :
float bottomOfScreen = getResources().getDisplayMetrics().heightPixels;
but you probably want it minus the height of your LinearLayout or else your LinearLayout will be cut off by the bottom :
float bottomOfScreen = getResources().getDisplayMetrics().heightPixels
- child.getHeight();
// if you want a little more space to the bottom
// try something like - child.getHeight()*2;
Then use ViewPropertyAnimator to animate your LL like this :
child.animate()
.translationY(bottomOfScreen)
.setInterpolator(new AccelerateDecelerateInterpolator())
.setDuration(250);
The Interpolator is just to make the animation more realistic.
In the case that child.getHeight() returns 0 , your Linear Layout has not been finished setting up by the system, in that case you might want to do something like :
child.post(new Runnable() {
#Override
public void run() {
float bottomOfScreen = getResources().getDisplayMetrics().heightPixels
- child.getHeight()*2;
child.animate()
.translationY(bottomOfScreen)
.setInterpolator(new AccelerateDecelerateInterpolator())
.setDuration(250);
}
});
Remember that a duration of 250 milliseconds is very fast, and does usually not look cool translating stuff on the screen, so you might want to set it a little higher, but thats just a matter of taste.
I am trying to expand and shrink the width of container with animation.
I am doing both of those with ValueAnimator and both of those are working fine separately.
The expand animation will be perform when the user scroll up the cards and shrink animation will be perform when the user scroll down the cards.
Because all of those cards are in ScrollView container, the user can scroll up / down whenever they want even though the expanding / shrinking Animation is not finished.
To be more clear, it looks like the shrink animation is being triggered when the cards are still expanding. Below is my code for expanding / shrinking.
private void animateResizeWidth(final View vcLogin, int widthReduce){
ValueAnimator anim;
if(widthReduce == 0){
anim = ValueAnimator.ofInt((ScreenUtils.getObjInstance().getPixelFromDPI(CARD_WIDTH) - ScreenUtils.getObjInstance().getPixelFromDPI(widthReduce)), ScreenUtils.getObjInstance().getPixelFromDPI(CARD_WIDTH));
}else{
anim = ValueAnimator.ofInt(ScreenUtils.getObjInstance().getPixelFromDPI(CARD_WIDTH), (ScreenUtils.getObjInstance().getPixelFromDPI(CARD_WIDTH) - ScreenUtils.getObjInstance().getPixelFromDPI(widthReduce)));
}
final RelativeLayout.LayoutParams finalLp2 = new RelativeLayout.LayoutParams(vcLogin.getLayoutParams());
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
int val = (Integer) valueAnimator.getAnimatedValue();
finalLp2.width = val;
finalLp2.addRule(RelativeLayout.CENTER_HORIZONTAL);
vcLogin.setLayoutParams(finalLp2);
vcLogin.invalidate();
}
});
anim.setDuration(400);
anim.start();
}
So, whenever that happen, the size of the cards are being set to regular size and the resize animation won't trigger anymore (Need to restart the Host Activity).
I have tried the answer from here. But, it is not helping me.
My Questions are 1: Is there any other Animation Mechanism that
I can use for width animation except ValueAnimator ? I have checked
ObjectAnimator but, not supporting. Ref 2: Is that thread
issue ? 3: I should not be blocking user from scrolling down
just because my expanding animation is not finished. So, what I haven
in mind is if the user scroll down, I will just terminate any of my
pending animations. Is there any thread-related issue that I need to consider for this approach ? (I have written a Custom
ScrollView to detect those scroll-related events.)
I think I am missing a few thread-safe logics in above animation implementation.
Thanks
I have a LinearLayout, I'm applying a translation animation to it. I'm filling the animation before and after. Visually it works fine. The animation ends by translating the view off screen. But if I click an x,y coordinate on screen that happens to be where the view was at some point during its animation, a button on the view has its click listener fire.
The only solution I've found is to add an animation listener, and when the animation ends, mark the buttons on the (now out of view) layout to visibility=gone, enabled=false. This seems bizarre - the view is no longer on screen, but it's still responding to click events. Is this a known thing, I'm probably not setting the animation up correctly?
Thanks
----- Update --------
I refactored my animation a little. Instead of using animation.setFillAfter(true), I set the layout's visibility to GONE when the animation is complete. Now it doesn't register clicks when off-screen. Still interested to know if this is a known thing, as it'd be easier to simply not have to add an animation listener etc.
Translate Animations on lower level API( below honey comb) changes where the button is drawn, but not where the button physically exists within the container. So, you are on your own to handle this situation. For more information about this you can refer to this link. One way is to actually change the location of the button in the layout(not by animation). Here is how you can achieve this:
params = (LayoutParams) mBtn.getLayoutParams();
TranslateAnimation animation = new TranslateAnimation(0, 0, 0, 400);
animation.setDuration(2000);
animation.setAnimationListener(mAnimationListener);
mBtn.startAnimation(animation);
....
....
private AnimationListener mAnimationListener = new AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
}
#Override
public void onAnimationRepeat(Animation animation) {
}
#Override
public void onAnimationEnd(Animation animation) {
params.topMargin = params.topMargin + 400;
mButton.setLayoutParams(params);
}
};
Here by changing the layout params we are changing the physical position of the button.
In your case as view is going off the screen so you just need to change the visibility of the button(View.GONE) on animation end.
I have a LinearLayout (LayoutContentView) which can contain one or two view (SubView1 and SubView2) (they are eitherTextView or ImageView).
This layout is in another LinearLayout (MyScreenLayout).
I want to make an animation on LayoutContentView so it can move and show just a part of it in MyScreenLayout.
Both of these layouts have setClipChildren(false); so it can let it's children draw outside it-self.
Depending on different parameters, I can change the size of the content, and the size of the content I will show.
Basically, I expend from top to bottom to show the two subviews and unexpend for bottom to top to show only the second subview. Before I expend, I increase the size of the LayoutContentView, so it can show the two subviews, and after I unexpend, I decrease the size of the LayoutContentView, so it can only show the second subview, and it let space on the screen for other elements.
Here is my method for expending and un-expending LayoutContentView :
mLayoutContentView.clearAnimation();
float yFrom = 0.0F;
float yTo = 0.0F;
float xFrom = 0.0F;
float xTo = 0.0F;
if (expend) { // if we expend
// I change the height of my LayoutContentView so it we can show it's two subviews
final android.view.ViewGroup.LayoutParams lp = mLayoutContentView.getLayoutParams();
lp.height = subView1H + subView2H;
setLayoutParams(lp);
invalidate();
// we start the animation so it shows only the second subview
yFrom = -subView1H;
// and we animate from top to bottom until it shows the two subviews
yTo = 0;
} else { // if we un-expend
// we animate from bottom to top starting by showing the two subviews
yFrom = 0;
// and progressively hiding the first subview and showing only the second subview
yTo = -subView1H;
}
Animation anim = new TranslateAnimation(xFrom, xTo, yFrom, yTo);
anim.setDuration(1000);
anim.setFillAfter(true);
anim.setFillEnabled(true);
anim.setAnimationListener(new AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
}
#Override
public void onAnimationRepeat(Animation animation) {
}
#Override
public void onAnimationEnd(Animation animation) {
if (!expend) {
// if we un expend at the end of the animation we can set the size of LayoutContentView to the size of the second subview again
final android.view.ViewGroup.LayoutParams lp = mLayoutContentView.getLayoutParams();
lp.height = subView2H;
mLayoutContentView.setLayoutParams(lp);
invalidate();
}
}
});
mLayoutContentView.startAnimation(anim);
The way I made my animation I need it to apply on LayoutContentView, the layout which contain two subview, and with startAnimation() it doesn't do the animation.
I tried to use a LayoutAnimationController, but instead of doing the animation on the LayoutContentView, it does it on each of its children...
I also tried to do the animation on each children myself, but I don't know why, the second subview isn't shown.
Each time I've tried to use HierarchyViewer, but it's does see the change made by the animation.
Does anyone know a solution or have faced the same problem and found a good solution ?
EDIT :
Well it seems that if you set a background color to your TextView and move them with animation, the background move but even if you have set the fill after parameter to your animation, the background moves back to it's original position or something like that, and therefore as I set a background color to both of my SubViews, somewhat one of the SubView's background hide the background of the other...
And there also a problem if after the animation, one of the SubView is still outside the its layout, there is also a problem during the animation, so I add a limitation to what I intended to here too.