Android 属性动画三剑客
TypeEvaluator
TypeEvaluator<T> interface 计算类型值 支持泛型
方法：T evaluate(float fraction, T startValue, T endValue)
就是用来计算属性值的，即可计算任意类型的值。
fraction 表示时间的比率。
实现类有： ArgbEvaluator ARGB颜色计算器
FloatEvaluator float型计算器
IntEvaluator int计算器
Interpolator
TimeInterpolator 时间插入器 接口，反应动画的运动速率。getInterpolation()根据一定算法，返回时间比率
Interpolator interface 继承自TimeInterpolator
AnimatorUpdateListener
onAnimationUpdate(ValueAnimator animation) {
value = ()animation.getAnimatedValue();//此即为计算器和时间插值器计算结果值
}
复杂写法TypeEvaluator
@Override
public void closeMenu() {
FuzeLog.d(TAG, "closeMenu");
final ViewGroup.LayoutParams params = (ViewGroup.LayoutParams)themeGridView.getLayoutParams();
ViewProperty start = new ViewProperty();
start.scaleX = 1;
start.scaleY = 1;
start.TransX = 0;
start.TransY = 0;
ViewProperty end = new ViewProperty();
end.scaleX = 1.25f;
end.scaleY = 1.25f;
end.TransX = -236;//221-(599-1142*0.125)
end.TransY = 68;//115-(161-919*0.125)
ValueAnimator anim = ValueAnimator.ofObject(viewEvaluator,start,end);//ValueAnimator.ofFloat(1,1.25f);
anim.setDuration(300);
anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
ViewProperty value = (ViewProperty)animation.getAnimatedValue();
themeGridView.setScaleX(value.scaleX);
themeGridView.setScaleY(value.scaleY);
themeGridView.setTranslationX(value.TransX);
themeGridView.setTranslationY(value.TransY);
}
});
anim.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
params.height = 770;//965/1.25
}
@Override
public void onAnimationRepeat(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
}
@Override
public void onAnimationCancel(Animator animation) {
}
});
anim.start();
}
class ViewProperty{
float scaleX;
float scaleY;
int TransX;
int TransY;
}
private TypeEvaluator<ViewProperty> viewEvaluator = new TypeEvaluator<ViewProperty>() {
@Override
public ViewProperty evaluate(float fraction, ViewProperty startValue,
ViewProperty endValue) {
float cScaleX =startValue.scaleX + (endValue.scaleX - startValue.scaleX)*fraction;
float cScaleY =startValue.scaleY + (endValue.scaleY - startValue.scaleY)*fraction;
int cTransX = startValue.TransX + (int)((endValue.TransX - startValue.TransX)*fraction);
int cTransY = startValue.TransY + (int)((endValue.TransY - startValue.TransY)*fraction);
ViewProperty cVP = new ViewProperty();
cVP.scaleX = cScaleX;
cVP.scaleY = cScaleY;
cVP.TransX = cTransX;
cVP.TransY = cTransY;
return cVP;
}
};