Develop Reference

Android View animation to top parent

My target is to animate current view from it's current position(center), to top border of it's parent. Is that possible? I have already tried next code, but the problem is that my view disappears after animation:
Animation bottomUp = AnimationUtils.loadAnimation(context, R.anim.bottom_up);
popup.startAnimation(bottomUp);
and
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:fromYDelta="100%"
android:toYDelta="0%"
android:fillAfter="true"
android:duration="500"/>
</set>

That can easily be done in Java with ViewPropertyAnimator
popup.animate().translationY(0).setDuration(500); // 0 is top of Y axis
The animation always starts at the current position.
Check the ViewPropertyAnimator docs for future animations, it's very easy to use and can save you a lot of code.

Android : How to change animation speed dynamically?

i have a transition animation xml
<set
xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="#android:anim/linear_interpolator"
android:fillAfter="true">
<translate
android:fromXDelta="100%p"
android:toXDelta="0%p"
android:duration="400"/>
</set>
I want to apply this animation on several items but with varying duration. I'm trying to dynamically change duration by calling setDuration and then calling startAnimation.
mSlideLeft.setDuration(400);
view1.startAnimation(mSlideLeft);
mSlideLeft.setDuration(500);
view2.startAnimation(mSlideLeft);
mSlideLeft.setDuration(600);
view3.startAnimation(mSlideLeft);
but all view animation in same duration. How do I dynamically change duration of animation?

You're using the same Animation object for all three Views. So you're calling setDuration on the same object 3 times.
You need to create three separate Animation objects if you want to use three different durations.
Animation firstSlideLeft = AnimationUtils.loadAnimation(context, R.anim.slide_left);
firstSlideLeft.setDuration(400);
view1.startAnimation(firstSlideLeft);
Animation secondSlideLeft = AnimationUtils.loadAnimation(context, R.anim.slide_left);
secondSlideLeft.setDuration(500);
view2.startAnimation(secondSlideLeft);
Animation thirdSlideLeft = AnimationUtils.loadAnimation(context, R.anim.slide_left);
thirdSlideLeft.setDuration(600);
view3.startAnimation(thirdSlideLeft);

Animation on changing ImageBitmap of ImageButton

Let's say I have an ImageButton btn. I have two different Bitmap, bmp1 and bmp2. By default, btn displays bmp1, like this:
btn.setImageBitmap(bmp1);
Can I somehow make an animation, which crossfades bmp1 and bmp2, when calling the following:
btn.setImageBitmap(bmp2);
So the question is, is it possible - if yes, how - to animate the changing of bitmaps on ImageButtons?

The way I see it, there are two main ways to implement this functionality. Note that there may be other methods that will make this happen exactly as you are describing, but these would be my approaches.
First Approach: Leveraging the onAnimationEnd() Callback
Here, you would want to essentially fade out the first ImageButton, change the resource in the onAnimationEnd() callback, and then fade it back in. To do this, you would have to implement the below code.
Create an Animation resource in XML that would be used to fade the View in:
<!-- Filename: fadein.xml -->
<set xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Note that you might want to change the duration here-->
<alpha
android:fromAlpha="0.0"
android:toAlpha="1.0"
android:duration="250"/>
</set>
Create an Animation resource in XML that would be used to fade the View out:
<!-- Filename: fadeout.xml -->
<set xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Note that you might want to change the duration here-->
<alpha
android:fromAlpha="1.0"
android:toAlpha="0.0"
android:duration="250"/>
</set>
Load the fade out and fade in Animations in your code:
// Obtain a reference to the Activity Context
Context context = getContext();
// Create the Animation objects.
Animation outAnimation = AnimationUtils.loadAnimation(context, R.anim.fadeout);
Animation inAnimation = AnimationUtils.loadAnimation(context, R.anim.fadein);
Assign a new AnimationListener to this Animation, and build it out as follows:
outAnimation.setAnimationListener(new AnimationListener(){
// Other callback methods omitted for clarity.
public void onAnimationEnd(Animation animation){
// Modify the resource of the ImageButton
yourImageButton.setImageResource(R.drawable.[your_second_image]);
// Create the new Animation to apply to the ImageButton.
yourImageButton.startAnimation(inAnimation);
}
}
Assign the Animation to the ImageButton, and start the first Animation:
yourImageButton.startAnimation(outAnimation);
Then, if you wish to animate back to the previous image, you would simply do the same but in the reverse order.
Second Approach: Overlay a Second ImageButton
For this approach, you would simply assign two ImageButtons to the same coordinates on the screen, and with the same width. Then, you would fade out the first ImageButton and fade in the second one after the first Animation ended (much like the example above).
I hope that this answer aligns with your expectations. My apologies if there are any code errors, as I am doing this without an editor at the moment. Please let me know if you would like any additional clarification!

It is not possible to animate image button source changes. The workaround would be to stack two ImageButtons and animate its alfa channel separately to get expected behavior.

Translate animation works perfectly when defining with XML and only once perfectly by code - Android

I'm getting this weird issue. Basically I'm animating a view with translate animation. (Translate into the screen and out via 2 different events) My code for translate animation is:
final Animation animtopOut = new TranslateAnimation(0, 0, 0, -mainHeaderlayout.getMeasuredHeight());
animtopOut.setDuration(500);
animtopOut.setFillAfter(true);
mainHeaderlayout.setAnimation(animtopOut);
And the xml code is:
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:fillAfter="true"
android:interpolator="#android:anim/accelerate_interpolator" >
<translate
android:fromYDelta="0%p"
android:toYDelta="-99%p"
android:duration="600"
android:fillAfter="true">
</translate>
</set>
Setting it using the code:
final Animation animtopOut = AnimationUtils.loadAnimation(mContext, R.anim.header_animate_out);
When I trigger the animation it works fine if I use the xml animation properties. The problem is when i use it via code. Which is what I want. It runs with translate animation only for the first time. The second time, when it is triggered, the view is inside the screen without animation. Please some one help me if I'm missing any properties. Thanks.
EDIT : (extra info)
There are actually two different animations that are triggered on the same view via two different events. I have actually posted one animation property. The other is almost the same. with just values are different.

Have you tried animation configuration like this
animtopOut.setRepeatCount(Animation.INFINITE);
animtopOut.setRepeatMode(Animation.RESTART);
animtopOut.setInterpolator(new LinearInterpolator());
?

Why Android animation is not freeze but return to start

I search but cant find out any infromation how to freeze last state of animation like rotation or else.
I think than animation it's change some pictures with show's last state.
I have next xml animation file
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="true">
<rotate android:fromDegrees="0" android:toDegrees="300"
android:duration="5000" android:pivotX="50%" android:pivotY="50%"
android:startOffset="10"
>
</rotate>
</set>
As you can see parameter toDegress it's setted to 300.
I use this animation xml to rotate text with next code
Animation animation1 = AnimationUtils.loadAnimation(this,
R.anim.myanimation);
animation1.setAnimationListener(this);
View animatedView1 = findViewById(R.id.rotatetext);
animatedView1.startAnimation(animation1);
But then animation stops text not rotated state no 300 degrees, it's returns to 0 degress.
How i can do what animation freeze on last frame?
Keep It Simple Stupid
Read,read and read documentation
When set to true, the animation transformation is applied after the
animation is over. The default value is false. If fillEnabled is not
set to true and the animation is not set on a View, fillAfter is
assumed to be true.
Must be a boolean value, either "true" or "false".

You can implement an AnimationListener and set to your animation object. write some code to change the View's state in the method onAnimationEnd().