How to animate ImageButton in Android Studio?

Question

Android

How to animate an ImageButton when it is clicked?
In the res/anim folder, I created the animation_button.xml file :

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <rotate
        android:duration="250"
        android:fromDegrees="0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toDegrees="360" />
    <scale
        android:duration="200"
        android:fromXScale="1.0"
        android:fromYScale="1.0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="0.8"
        android:toYScale="0.8" />
</set>

In the OnCreate() function I wrote

final Animation animButton = AnimationUtils.loadAnimation(this, R.anim.animation_button);
ImageButton btnStart = (ImageButton) this.findViewById(R.id.btnStart);
btnStart.setOnClickListener(onClickListener);

And put a handler on the OnClick event :

View.OnClickListener onClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.btnStart:
                    btnStart.startAnimation(animButton);
                    break;
........................................
            }
        }
    };

But as a result, when you click on the button, an application error occurs. What could be the problem and how to implement this task correctly?

Answer 1

better make images of buttons of two types, large and small. You can also change colors.