Develop Reference

Animate change of view background not happening smoothly

I am trying to animate the back ground of my activity
What i have done is
ImageView image = (ImageView) findViewById(R.id.toggle_image);
final TransitionDrawable td = new TransitionDrawable( new Drawable[] {
getResources().getDrawable(R.drawable.welcomeimagetoggle1),
getResources().getDrawable(R.drawable.welcomeimagetoggle2)
});
image .setImageDrawable(td);
td.startTransition(3000);
td.reverseTransition(3000);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
//Do something after 100ms
td.startTransition(3000);
td.reverseTransition(3000);
handler.postDelayed(this, 3000);
}
}, 3000);
It's working properly but the problem is while the timer ends the change happening is to smooth , there is a sudden movement. How can i avoid that ?

I think you should use this library (DexMovingImageView) instead.
It offers some cool transitions (check their demo). In your case, use the DexCrossFadeImageView with multiple images.
Don't forget to make the window background of your activity transparent to avoid overdraw.
UPDATE : About the padding, check the scaletype. As for animation, here's KenBurnsView (ImageView animated by Ken Burns effect), Motion (ImageView with a parallax effect that reacts to the device's tilt) and finally LoyalNativeSlider (An image slider with many cool animations). Hope this helps!

FloatingActionButton icon animation (Android FAB src drawable animation)

I was trying to find documentation about how to create icon animation of FAB's (of the Design support library), after searching a while i couldn't find any information about it and the AnimationDrawable reference in android developers doesn't work for FAB's even if the class is a child of ImageView.
but manage to get a workaround that works just fine.

The technic I used is similar to the one exposed on the DrawableAnimation documentation, and using the Property Animation API doc.
First I use the ValueAnimator class, and an int array containing the ids of the drawables that you're going to use in your animation.
final int[] ids = {R.drawable.main_button_1,R.drawable.main_button_2,R.drawable.main_button_3,R.drawable.main_button_4,R.drawable.main_button_5,R.drawable.main_button_6, R.drawable.main_button_7};
fab = (FloatingActionButton) findViewById(R.id.yourFabID);
valueAnimator = ValueAnimator.ofInt(0, ids.length - 1).setDuration(yourAnimationTime);
valueAnimator.setInterpolator( new LinearInterpolator() /*your TimeInterpolator*/ );
Then set up an AnimationUpdateListener, and define the change in icon behavior with the method FloatinActionButton.setImageDrawable(Drawable yourDrawable).
But the ValueAnimator updates by default every available frame (depending on the load in hardware), but we don't need to redraw the icon if it has already been drawn, so that is why I use the variable "i"; so each icon is drawn only once. (the timing depends on the interpolator you define)
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
int i = -1;
#Override
public void onAnimationUpdate(ValueAnimator animation) {
int animatedValue = (int) animation.getAnimatedValue();
if(i!=animatedValue) {
fab.setImageDrawable(getResources().getDrawable(ids[animatedValue]));
i = animatedValue;
}
}
});
This implementation allows you to play the animation backward with the method ValueAnimator.reverse();
I know is not a pro solution but it's the only one I've figured out to work on all API's supporting the PropertyAnimation. Please, if you know a better solution post it here, if not I hope this post is helpful

You can achieve FAB's src drawable animation quite similarly to other views that use background for AnimationDrawable.
For general views' background drawable animation, see Use AnimationDrawable.
However, you cannot call getBackground() to get FAB's src.
Instead, use getDrawable().
Example:
FloatingActionButton loginButton = findViewById(R.id.loginButton);
loginAnimation = (AnimationDrawable) loginButton.getDrawable();
loginButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
loginAnimation.start();
}
});

How to do frame-by-frame animation on Android?

I am trying to find out how to do png frame-by-frame animation at a good frame rate...
I have a bunch of pngs(probably 1500 png poses) and I need to play them one-by-one (just like a talking app, take tom cat as an example)
I`ve already tried SurfaceView, normal View, AnimationDrawable and also ImageView(with a thread setting the background with a sleep(33)[for a 30fps]), but none of these ways made a good frame rate compared to tom cat on bad CPU phones (like HTC Desire A).
Its also good to say that I've already added Options to set up the in SampleSize for the images, in case it needs more memory or processing speed.
I think the unique way is loading up an amount of pngs , draw on the SurfaceView and while it plays load more pngs and recycle the other bitmaps...
Anyone can help me with that? At least with some code?
Thanks!

here you go... try this... :)
create an XML file like this on ur values folder
<?xml version="1.0" encoding="utf-8"?>
<resources>
<array name="frames">
<item>#drawable/pak1_1</item>
<item>#drawable/pak1_2</item>
<item>#drawable/pak1_3</item>
<item>#drawable/pak1_4</item>
<item>#drawable/pak1_5</item>
</array>
</resources>
Now try this code:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Resources res = getResources();
TypedArray FrameImages = res.obtainTypedArray(R.array.frames);
animation = new AnimationDrawable();
for (int i = 0; i < 1500; i++) {
Drawable drawable = FrameImages.getDrawable(i);
animation.addFrame(drawable, 33);
}
animation.setOneShot(false);
ImageView imageAnim = (ImageView) findViewById(R.id.img);
imageAnim.setBackgroundDrawable(animation);
// run the start() method later on the UI thread
imageAnim.post(new Starter());
}
class Starter implements Runnable {
public void run() {
animation.start();
}
}

How to set a specific frame in android animation

I have a frame-by-frame animation and I want to set a specific frame when the stop method has been called. I searched a lot but I haven't found what I was serching for.
Does this method exists? Is it possible to do that?

Use this method on your AnimationDrawable: animationDrawable.selectDrawable(index)

Assuming that frame-by-frame means AnimationDrawable given in the background of an ImageView.
Like that (or via xml):
AnimationDrawable animationDrawable = new AnimationDrawable();
animationDrawable.addFrame(drawableFrame1, 0);
animationDrawable.addFrame(drawableFrame2, 1);
animationDrawable.addFrame(drawableFrame3, 2);
animationDrawable.addFrame(drawableFrame4, 3);
iv = new ImageView(this);
iv.setBackgroundDrawable(animationDrawable);
Here is the code to retrieve a given frame and set it to the background of the ImageView
onStop() {
Drawable drawableFrame2 = ((AnimationDrawable)iv.getBackground()).getFrame(2);
iv.setBackgroundDrawable(drawableFrame2);
iv.postInvalidate();
}

animation does not start in canvas on android

I'm working on a game that requires drawing to SurfaceView's
Canvas. I'm using SurfaceHolder to obtain Canvas to draw to, and
perform drawing in a separate thread. Everything I draw displays
correctly except for this one animation.
Here is the animation definition (it is in res/drawable/
my_animation.xml:
and here is how I draw it to the Canvas:
AnimationDrawable ad = (AnimationDrawable)getResources().getDrawable(R.drawable.my_animation);
ad.draw(canvas);
ad.start();
but only the first frame ever appears on the screen.
What am I missing?
Thank you

If I get the reference right, you have to assign your AnimationDrawable to an ImageView as the example from http://developer.android.com/reference/android/graphics/drawable/AnimationDrawable.html demonstrates:
// Load the ImageView that will host the animation and
// set its background to our AnimationDrawable XML resource.
ImageView img = (ImageView)findViewById(R.id.spinning_wheel_image);
img.setBackgroundResource(R.drawable.spin_animation);
// Get the background, which has been compiled to an AnimationDrawable object.
AnimationDrawable frameAnimation = (AnimationDrawable) img.getBackground();
// Start the animation (looped playback by default).
frameAnimation.start()
In your case you did not assign your AnimationDrawable to any view so I suppose that's why it does not get updated. So you have to call AnimationDrawable.getFrame(int) manually.
If you are already using a separate thread why don't you involve also the code for your animation? This would render your code more consistent in my opinion.

Although this is an old question, i run into this problem too and figure out a walkaround, so i just post it here in case anyone searching about.
```java
final AnimationDrawable animationDrawable = ...;
final View v = new View(this) {
#Override
protected void onDraw(Canvas canvas) {
animDrawable.draw(canvas);
}
};
animationDrawable.setCallback(new Callback() {
#Override
public void unscheduleDrawable(Drawable who, Runnable what) {
v.removeCallbacks(what);
}
#Overridew
public void scheduleDrawable(Drawable who, Runnable what, long when) {
v.postDelayed(what, when - SystemClock.uptimeMillis());
}
#Override
public void invalidateDrawable(Drawable who) {
v.postInvalidate();
}
});
```

Animated drawables of all kinds (Transition, etc.) need a Callback to schedule redrawals. As zhang demonstrates, it is a simple interface for posting Runnables.
To support animated drawables in a custom view, you need two things:
pass your View to your animated Drawable's setCallback. Even base View implements Drawable.Callback, so there's no need to write your own wrapper.
override verifyDrawable to also return true for your animated Drawable.
As to why anyone would need that - I have just implemented animated drawable support in RecyclerView.ItemDecorations, how cool is that :-)

You are working with Canvas means, you are coding in low level. In low level u have to do everything. working with View (ImageView) means, it is high level.In ImageView already defined in low level on canvas how to deal with AnimationDrawable.

Lars Blumberg's answer is correct but the documentation is incorrect; you also need to take into account this: animation start issue