public void objectAnimation(View v){
LinearLayout llProgress = (LinearLayout) findViewById(R.id.ll_progress);
final float scale = getResources().getDisplayMetrics().density;
float distance = (255 * scale + 0.5f);
ViewWrapper wrapper = new ViewWrapper(llProgress);
ObjectAnimator animator = ObjectAnimator.ofInt(wrapper,"width",(int)distance);
animator.setDuration(4000);
animator.start();
}
public void ivAnimation(final View v){
//单个属性
ObjectAnimator.ofFloat(v,"rotationX",0f,180f).setDuration(1000).start();
ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(v, "yjs", 1f, 0f);
objectAnimator.setDuration(1000);
objectAnimator.start();
//多个属性动画方法一
objectAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float scale = animation.getAnimatedFraction();
v.setAlpha(scale);
v.setScaleX(scale);
v.setScaleY(scale);
}
});
//多个属性动画方法二
PropertyValuesHolder phx = PropertyValuesHolder.ofFloat("alpha",1f,0f);
PropertyValuesHolder phy = PropertyValuesHolder.ofFloat("scaleX",1f,0f);
PropertyValuesHolder phz = PropertyValuesHolder.ofFloat("scaleY",1f,0f);
ObjectAnimator.ofPropertyValuesHolder(v,phx,phy,phz).setDuration(3000).start();
//动画定义在xml文件中
Animator animator = AnimatorInflater.loadAnimator(this,R.animator.scale);
animator.setTarget(v);
animator.start();
}
//如果某个属性没有get和set方法需要写一个wrapper类将get set封装
private class ViewWrapper{
private View target;
public ViewWrapper(View v){
target= v;
}
public int getWidth(){
return target.getLayoutParams().width;
}
public void setWidth(int width){
target.getLayoutParams().width = width;
target.requestLayout();
}
}
xml文件
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:ordering="together">
<objectAnimator android:duration="1000" android:propertyName="scaleX" android:valueFrom="1.0" android:valueTo="2.0" android:valueType="floatType" >
</objectAnimator>
<objectAnimator android:duration="1000" android:propertyName="scaleY" android:valueFrom="1.0" android:valueTo="2.0" android:valueType="floatType"></objectAnimator>
</set>
参考链接一
参考链接二