Kotlin-Animation-DSL
This repository create a series of API to make animation code shorter and more readable, it has the following features:
- Using just one third of code to create animation compare to origin Android API.
- The code written by
Kotlin-Animation-DSLis just like an enghlish article.
Example
If we want to do an animation like the following: scale textView and translate button at the same time, then stretch imageView. in the end of animation, show a toast.
Android style
Using Android origin API, the code will like this:
PropertyValuesHolder scaleX = PropertyValuesHolder.ofFloat("scaleX", 1.0f, 1.3f);
PropertyValuesHolder scaleY = PropertyValuesHolder.ofFloat("scaleY", 1.0f, 1.3f);
ObjectAnimator tvAnimator = ObjectAnimator.ofPropertyValuesHolder(textView, scaleX, scaleY);
tvAnimator.setDuration(300);
tvAnimator.setInterpolator(new LinearInterpolator());
PropertyValuesHolder translationX = PropertyValuesHolder.ofFloat("translationX", 0f, 100f);
ObjectAnimator btnAnimator = ObjectAnimator.ofPropertyValuesHolder(button, translationX);
btnAnimator.setDuration(300);
btnAnimator.setInterpolator(new LinearInterpolator());
ValueAnimator rightAnimator = ValueAnimator.ofInt(ivRight, screenWidth);
rightAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
int right = ((int) animation.getAnimatedValue());
imageView.setRight(right);
}
});
rightAnimator.setDuration(400);
rightAnimator.setInterpolator(new LinearInterpolator());
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.play(tvAnimator).with(btnAnimator);
animatorSet.play(tvAnimator).before(rightAnimator);
animatorSet.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {}
@Override
public void onAnimationEnd(Animator animation) {
Toast.makeText(activity,"animation end" ,Toast.LENGTH_SHORT).show();
}
@Override
public void onAnimationCancel(Animator animation) {}
@Override
public void onAnimationRepeat(Animator animation) {}
});
animatorSet.start();
Too long and unreadable!
DSL style
Let us do it by DSL:
animSet {
objectAnim {
target = textView
scaleX = floatArrayOf(1.0f,1.3f)
scaleY = scaleX
duration = 300L
interpolator = LinearInterpolator()
} with objectAnim {
target = button
translationX = floatArrayOf(0f,100f)
duration = 300
interpolator = LinearInterpolator()
} before anim{
values = intArrayOf(ivRight,screenWidth)
action = { value -> imageView.right = value as Int }
duration = 400
interpolator = LinearInterpolator()
}
onEnd = Toast.makeText(activity,"animation end",Toast.LENGTH_SHORT).show()
start()
}
The animations' creation and the relationship between them is define in one method.You can use with and before to define the sequence of animations just like speaking english.