animation of TextView's text size

问题:

I want to be able to do a text animation and change the size of the text in a TextView. I read that there are property animations in android but if someone knows a simple code that can do this for me or an example somewhere I will deeply appreciate it. Thank u in advance!

回答1:

scale.xml

<?xml version="1.0" encoding="utf-8"?>
<set
    xmlns:android="http://schemas.android.com/apk/res/android">
    <scale
          android:fromXScale="1.0"
          android:fromYScale="1.0"
          android:toXScale="2.0"
          android:toYScale="2.0"
          android:duration="3000"></scale>
</set>

A function into an Activity:

private void RunAnimation() 
{
    Animation a = AnimationUtils.loadAnimation(this, R.anim.scale);
    a.reset();
    TextView tv = (TextView) findViewById(R.id.firstTextView);
    tv.clearAnimation();
    tv.startAnimation(a);
}

extracted and modified from here

回答2:

Animation animation=new TranslateAnimation(0,480,0,0); 
animation.setDuration(5000);
animation.setRepeatMode(Animation.RESTART);
animation.setRepeatCount(Animation.INFINITE);
text.startAnimation(animation);
// applying animation to textview object..

If you are using button event to show animation then put the code inside onClick() otherwise use override method onWindowFocusChanged(boolean hasFocus) to start animation

回答3:

How about this link? In particular the scale examples. It provides source code and videos for several different types of Android animations.

回答4:

Use ValueAnimator class in the android

final float startSize = o; // Size in pixels
    final float endSize = 30;
    final int animationDuration = 1000; // Animation duration in ms

    ValueAnimator animator = ValueAnimator.ofFloat(startSize, endSize);
    animator.setDuration(animationDuration);

    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            float animatedValue = (float) valueAnimator.getAnimatedValue();
            tv.setTextSize(animatedValue);
        }
    });

    animator.start();

refer this link ValueAnimator

Another solution is that apply scale animation on Textview or its parent layout

ScaleAnimation scaleAnimation = new ScaleAnimation(0.7f, 1.1f, 0.7f, 1.1f, ScaleAnimation.RELATIVE_TO_SELF, 0.5f,
                   ScaleAnimation.RELATIVE_TO_SELF, 0.5f);
scaleAnimation.setDuration(600);
viewZoom.startAnimation(scaleAnimation);