CODEWITHSUNDEEP
javaandroid
TeamLiquid1210
TeamLiquid1210

Reputation: 81

Setting up an AnimationListener for an ObjectAnimator

In my program, I have an ObjectAnimator which moves an ImageView from left to right. I am trying to set up a listener which will execute a task when the ObjectAnimator is finished running. Here is the relevant section of code which I am currently using to try to accomplish this:

  if (num == 350) {
        nAnim = ObjectAnimator.ofFloat(gamePiece, "translationX", 0, num);
        nAnim.setDuration(2125);
        nAnim.start();
        nAnim.addListener(new AnimationListener() {
            @Override
            public void onAnimationEnd(Animator a) {
                startGame(level);
            }

            @Override
            public void onAnimationStart(Animator a) {

            }

            @Override
            public void onAnimationCancel(Animator a) {

            }

            @Override
            public void onAnimationRepeat(Animator a) {

            }

        });

When I try to run this in Android Studio, I am getting the error: MainActivity is not abstract and does not override abstract method onAnimationStart() in MainActivity. What do I have to do to fix this error?

Upvotes: 7

Views: 8205

Answers (3)

Tonnie
Tonnie

Reputation: 8112

Or switch to Kotlin and put animator.start() as the last line. Offcourse you don't have to implement all animations methods

  val gamePiece = Button(this)
    var num = 0
    val animator = ObjectAnimator.ofFloat(gamePiece, View.TRANSLATION_X, 0f, num.toFloat())
    animator.duration = 2125

    if (num ==350){

        animator.addListener(object : AnimatorListenerAdapter(){


          override fun onAnimationStart(animation: Animator?) {
                super.onAnimationStart(animation)
            }

            override fun onAnimationEnd(animation: Animator?) {
                super.onAnimationEnd(animation)
                startGame(level)
            }
        })
    }
    //animator.start() should be the last line
    animator.start()

Upvotes: 0

M Shafaei N
M Shafaei N

Reputation: 449

You should use AnimatorListener class instead of AnimationListener like below

nAnim.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animator) {

        }

        @Override
        public void onAnimationEnd(Animator animator) {

        }

        @Override
        public void onAnimationCancel(Animator animator) {

        }

        @Override
        public void onAnimationRepeat(Animator animator) {

        }


    });

Upvotes: 3

Bill
Bill

Reputation: 4646

Since you implemented AnimatorListener in your MainActivity, you must include all its abstract methods, and change nAnim.addListener(new Animat.... to nAnim.addListener(this)

@Override
public void onAnimationStart(Animator animation){
}

@Override
public void onAnimationEnd(Animator animation){
    startGame(level)
}

@Override
public void onAnimationRepeat(Animator animation){
}

@Override
public void onAnimationCancel(Animator animation){
}

Upvotes: 8

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