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.
Related
Working in Android Studio, I need to add in my app a click listener on my imageview which has a certain animation. This is the code I have in MainActivity:
myImage.startAnimation(myAnimation);
myImage.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//DO SOMETHING
}
});
myAnimation comes from an XML in anim folder which does a translational animation:
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
android:interpolator="#android:anim/accelerate_interpolator"
android:repeatCount="infinite"
android:repeatMode="reverse"
android:fromYDelta="0%p"
android:toYDelta="40%p"
android:duration="1000"/>
</set>
This works fine, although this click listener is set on the space that has the image on the layout (activity_main.xml) and does not follow the animation inserted in the image. If I click on the space which belongs to the image in the layout, the click listener starts even if the image is not there due to the animation.
Is there a way in which the click listener is attach to the imageview in motion?
Thank you
This happens because the xml Translate animation you are using, does not really animate the View's property, it just moves the pixels on the screen and so it just looks like it has changed position, that is why the OnClickListener is still active on the View's original position, because Android thinks the View never really moved.
Simple solution use ObjectAnimator or even better ViewPropertyAnimator. Both will animate the View's property and so the OnClicklistener will also change it's position with it.
Is there away to show some kind of effect when imageview pressed. I use imageview as a button, so need to show some effect on touch. Many existing threads propose selectors with multiple images. This is too much work, because I have a lot of imageviews. I am also open to extending the imageview class. Any ideas or workaround.
In a click function add
ImageView img= (ImageView) view.findViewById(R.id.theID);
Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha);
img.startAnimation(animation);
Create an anim folder in Assets and then cleate an animation resource file named alpha
inside the file paste the following
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
android:interpolator="#android:anim/accelerate_interpolator"
android:duration="50"
android:fromAlpha="0.5"
android:toAlpha="1.0" />
This type of animation just sets the Alpha tranparency to 50% and back to 100% so the image will flash.
There are many animations so have a look around on the net to find which one you like and create the anim resource file and put the name here R.anim.alpha);
in your imageView xml file you can add android:onClick="myClickFunction"
and then in the activity add
public void myClickFunction(View v) {
ImageView img = (ImageView) v.findViewById(R.id.theID);
Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.alpha);
img.startAnimation(animation);
}
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());
?
I want to create an animation for an image that is loaded into a vertical linear layout dynamically. When triggered I would like the image to slide down with its alpha set to 0 (this will slide all content below it down I hope) then fade the image in. Being new to Android animations I am having some trouble. Right now I'm trying to get just the fade in to work, here is what I have:
fade_in.xml
<?xml version="1.0" encoding="utf-8"?>
<alpha
xmlns:android="https://chemas.android.com/ap/res/android"
android:interpolator="#android:anim/anticipate_interpolator"
android:fromAlpha="0.0"
android:toAlpha="1.0"
android:duration="5000" >
</alpha>
In the Activity:
Animation animation = AnimationUtils.loadAnimation(context, R.anim.fade_in);
ImageView image = new ImageView(context);
image.setImageResource(R.drawable.my_image);
image.setLayoutParams(layoutParams);
image.setAlpha(0);
((ViewGroup) view).addView(image, 0);
image.startAnimation(animation);
The image is being loaded as all the context below it is shifted down, however if never fades in. I would like to get this working as well as having the image slide down so the dynamica add does not look so choppy.
Thanks in advance.
You have a typo in the xmlns:android tag.
It should be
xmlns:android = "http://schemas.android.com/apk/res/android"
With that being corrected, just remove the image.setAlpha(0); and it should animate. I am afraid I cannot give you a reason why it doesn't work with the alpha attribute set to 0.
Regarding the slide down animation, you will have to subclass Animation. Have a look at this answer that I think can help you get what you want: https://stackoverflow.com/a/5122460/871102
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().