根据传入值的变化，产生动画效果

ValueAnimator myAnimator = ValueAnimator.ofObject(new MyEvaluator(), "hello", "world");

myAnimator.addUpdateListener(new AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

String animatedValue = (String) animation.getAnimatedValue();

textView.setText(animatedValue);

}

});

myAnimator.setDuration(DURATION);

myAnimator.start();

private class MyEvaluator implements TypeEvaluator<String> {

@Override

public String evaluate(float fraction, String startValue,

String endValue) {

String result = startValue+fraction;

if (fraction == 0) {

result = "start";

} else if (fraction == 1) {

result += endValue;

}

return result;

}

原文链接：http://www.apkbus.com/blog-880881-63308.html