我计划在一定秒内通过动画实现 textView 上的整数从 0 增加到某个值。 例如,在文本视图上显示将数字从 0 增加到 600 的动画,持续 5 秒。
我该如何实现这个?
您可以使用 ValueAnimator 来实现:
private void startCountAnimation() {
ValueAnimator animator = ValueAnimator.ofInt(0, 600);
animator.setDuration(5000);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
public void onAnimationUpdate(ValueAnimator animation) {
textView.setText(animation.getAnimatedValue().toString());
}
});
animator.start();
}
看看这个简单的解决方案:
public void animateTextView(int initialValue, int finalValue, final TextView textview) {
ValueAnimator valueAnimator = ValueAnimator.ofInt(initialValue, finalValue);
valueAnimator.setDuration(1500);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
textview.setText(valueAnimator.getAnimatedValue().toString());
}
});
valueAnimator.start();
}
我在这里为 Kotlin 开发者提出答案:
fun startAnimation(textView: TextView) {
val animator = ValueAnimator.ofInt(0, 600)
animator.duration = 5000 // 5 seconds
animator.addUpdateListener { animation ->
textView.text = animation.animatedValue.toString()
}
animator.start()
}
Kotlin 中的灵活扩展:
fun TextView.animateNumberChange(startingNumber: Int, endingNumber: Int, duration: Long = 500L) {
val animator = ValueAnimator.ofInt(startingNumber, endingNumber)
animator.duration = duration
animator.addUpdateListener { animation ->
this.text = animation.animatedValue.toString()
}
animator.interpolator = AccelerateDecelerateInterpolator()
animator.start()
}
// usage:
myTextView.animateNumberChange(1, 10)
使用 ValueAnimator
TextView textview = findViewById(R.id.textview1);
ValueAnimator valueAnimator = ValueAnimator.ofInt(0, 600);
valueAnimator.setDuration(5000);
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
textview.setText(valueAnimator.getAnimatedValue().toString());
}
});
valueAnimator.start();