rotate属性Android中重复执⾏动画bug
在android中我们要经常⽤到看似⼀个没有时间限制的重复动画，如最常见的下拉刷新和上拉加载更多的loading加载动画：今天尝试了三种动画(以旋转为例):
ample.anim.anim;
import android.animation.Animator;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
/**
* Created by houruixiang on 2017/8/15.
*/
public class SimpleAnim {
private static ValueAnimator valueAnimator;
public static void startAnim(View view){
RotateAnimation rotateAnimation = new RotateAnimation(0, 360f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
rotateAnimation.setDuration(2000);
rotateAnimation.setFillAfter(true);
rotateAnimation.setRepeatCount(-1);
view.startAnimation(rotateAnimation);
}
public static void startOjAnim(View view){
ObjectAnimator rotation = ObjectAnimator.ofFloat(view, "rotation", 0, 360f);
rotation.setDuration(2000);
rotation.setRepeatCount(-1);
rotation.start();
}
public static void startValueAnim(final View view){
valueAnimator = ValueAnimator.ofFloat(0f, 360.0f);
//valueAnimator.setTarget(view);
//valueAnimator.setRepeatMode(ValueAnimator.RESTART);
valueAnimator.setRepeatCount(ValueAnimator.INFINITE);
valueAnimator.setDuration(1000);
valueAnimator.start();
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
float animatedValue = (float) AnimatedValue();
view.setRotation(animatedValue);
}
});
}
}
都存在这个问题，之前遇到这个问题，会误认为是补间动画和属性动画的差别，今天试了之后，都⼀样；抑或是restart的延迟造成的 其实都不是，只是动画的执⾏不是匀速的，所以当设置⼀个匀速插值器之后就完美解决问题；看下⾯代码(以valueAnimation为例):
public static void startValueAnim(final View view){
valueAnimator = ValueAnimator.ofFloat(0f, 360.0f);
//valueAnimator.setTarget(view);
//valueAnimator.setRepeatMode(ValueAnimator.RESTART);
valueAnimator.setRepeatCount(ValueAnimator.INFINITE);
valueAnimator.setDuration(1000);
valueAnimator.setInterpolator(new LinearInterpolator());
valueAnimator.start();
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
float animatedValue = (float) AnimatedValue();
view.setRotation(animatedValue);
}
});
}
关键代码:valueAnimator.setInterpolator(new LinearInterpolator());
ok,⽐较简单，感谢阅读，共同进步

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