相关链接
1.视图动画
AlphaAnimation、RotateAnimation、TranslateAnimation、ScaleAnimation继承自
Animation。AnimationSet表示动画集合。
动画的监听
animation.setAnimationListener(new Animation.AnimationListener(){
void onAnimationStart(Animation animation);
void onAnimationEnd(Animation animation);
void onAnimationRepeat(Animation animation);
})
加载xml动画
Animation animation = AnimationUtils.loadAnimation(this,R.anim.abc_fade_in);
代码动画
//public TranslateAnimation(float fromXDelta, float toXDelta, float fromYDelta, float toYDelta)
TranslateAnimation ta = new TranslateAnimation(0, 100, 0, 200);
ta.setDuration(1000);
as.addAnimation(ta);
缺点
视图动画问题：只是对View的影像做动画，并不是真正改变View的状态。有时候动画完成后View无法隐藏的现象，即 setVisibility(View.GONE)失效了，只要调用view.clearAnimation()清除view动画就可解决这个问题。
2.帧动画(AnimationDrawable)
在xml中的定义
<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="true">
<item android:drawable="@drawable/rocket_thrust1" android:duration="200" />
<item android:drawable="@drawable/rocket_thrust2" android:duration="200" />
<item android:drawable="@drawable/rocket_thrust3" android:duration="200" />
</animation-list>
注意： xml需要定义在draw目录下，否则打包时有如下错误提示:
Element animation-list must be declared <animation-list> XML file should be in "drawable", not "anim".
使用
ImageView rocketImage = (ImageView) findViewById(R.id.rocket_image);
rocketImage.setBackgroundResource(R.anim.rocket_thrust);
rocketAnimation = (AnimationDrawable) rocketImage.getBackground();
rocketAnimation.start();
3.属性动画(Animator 框架 AnimatorSet ObjectAnimator)
API11 android3.0 之后才有， nineoldandroids
PropertyValuesHolder 针对作用同一个对象的多个属性
PropertyValuesHolder pvh1 = PropertyValuesHolder.ofFloat("translationX",300f);
PropertyValuesHolder pvh2 = PropertyValuesHolder.ofFloat("scaleX",1f,0.1f); //缩放属性
PropertyValuesHolder pvh3 = PropertyValuesHolder.ofFloat("scaleY",1f,0.1f);
ObjectAnimator.ofPropertyHolder(view,pvh1,pvh2,pvh3).setDuration(1000).start();
ValueAnimator
示例1：View的显示与隐藏
@Override
public void onWindowFocusChanged(boolean hasFocus) {
if (hasFocus){
//获取要隐藏view的高度
mHiddenViewMeasuredHeight = mHiddenView.getMeasuredHeight();
}
super.onWindowFocusChanged(hasFocus);
}
public void llClick(View view) {
if (mHiddenView.getVisibility() == View.GONE) {
// 打开动画
animateOpen(mHiddenView);
} else {
// 关闭动画
animateClose(mHiddenView);
}
}
private void animateOpen(final View view) {
view.setVisibility(View.VISIBLE);
ValueAnimator animator = createDropAnimator(
view,
0,
mHiddenViewMeasuredHeight);
animator.start();
}
private void animateClose(final View view) {
int origHeight = view.getHeight();
ValueAnimator animator = createDropAnimator(view, origHeight, 0);
animator.addListener(new AnimatorListenerAdapter() {
public void onAnimationEnd(Animator animation) {
view.setVisibility(View.GONE);
}
});
animator.start();
}
private ValueAnimator createDropAnimator(
final View view, int start, int end) {
ValueAnimator animator = ValueAnimator.ofInt(start, end);
animator.addUpdateListener(
new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
int value = (Integer) valueAnimator.getAnimatedValue();
ViewGroup.LayoutParams layoutParams =
view.getLayoutParams();
layoutParams.height = value;
view.setLayoutParams(layoutParams);
}
});
return animator;
}
动画的监听
ObjectAnimator anim = ObjectAnimator.ofFloat(view,"alpha",0.5f);
anim.addListener(new AnimatorListener(){
void onAnimationStart(Animator animation);
void onAnimationEnd(Animator animation);
void onAnimationCancel(Animator animation);
void onAnimationRepeat(Animator animation);
});
也可以用 AnimatorListenerAdapter
abstract class AnimatorListenerAdapter implements Animator.AnimatorListener,
Animator.AnimatorPauseListener {}
anim.addListener(new AnimatorListenerAdapter(){
void onAnimationEnd(Animator animation){};
});
AnimatorSet 将动画以组合的形式展现出来
示例：menu 打开关闭动画
private void startAnim() {
ObjectAnimator animator0 = ObjectAnimator.ofFloat(mImageViews.get(0),"alpha",1F,0.5F);
ObjectAnimator animator1 = ObjectAnimator.ofFloat(mImageViews.get(1),"translationY",200F);
ObjectAnimator animator2 = ObjectAnimator.ofFloat(mImageViews.get(2),"translationX",200F);
ObjectAnimator animator3 = ObjectAnimator.ofFloat(mImageViews.get(3),"translationY",-200F);
ObjectAnimator animator4 = ObjectAnimator.ofFloat(mImageViews.get(4),"translationX",-200F);
AnimatorSet set = new AnimatorSet();
set.setDuration(200);
set.setInterpolator(new LinearInterpolator());
set.playTogether(animator0,animator1,animator2,animator3,animator4);
set.start();
}
private void closeAnim() {
ObjectAnimator animator0 = ObjectAnimator.ofFloat(mImageViews.get(0),"alpha", 0.5F, 1F);
ObjectAnimator animator1 = ObjectAnimator.ofFloat(mImageViews.get(1),"translationY", 200F, 0);
ObjectAnimator animator2 = ObjectAnimator.ofFloat(mImageViews.get(2),"translationX", 200F, 0);
ObjectAnimator animator3 = ObjectAnimator.ofFloat(mImageViews.get(3),"translationY", -200F, 0);
ObjectAnimator animator4 = ObjectAnimator.ofFloat(mImageViews.get(4),"translationX", -200F, 0);
AnimatorSet set = new AnimatorSet();
set.setDuration(500);
set.setInterpolator(new BounceInterpolator());
set.playTogether(animator0, animator1, animator2, animator3, animator4);
set.start();
mFlag = true;
}
Interpolators 插值器
TimeInterpolation： 用于定义动画变化率的接口
系统预设的有：
AccelerateDecelerateInterpolator(两头慢，中间快)
LinearInterpolator(匀速)
AccelerateInterpolator(减速)
CycleInterpolator (正弦周期变化插值器)
BounceInterpolator
AccelerateDecelerateInterpolator, AccelerateInterpolator, AnticipateInterpolator, AnticipateOvershootInterpolator, BaseInterpolator,
CycleInterpolator, DecelerateInterpolator, FastOutLinearInInterpolator, FastOutSlowInInterpolator, LinearInterpolator, LinearOutSlowInInterpolator, OvershootInterpolator, PathInterpolator
TypeEvaluator 估值器(插值器的好基友)
TypeEvaluator： 用于定义属性值计算方式的接口，系统自带int,float,color类型。
系统预设: IntEvaluator FloatEvaluator ArgbEvaluator
//fraction:估值小数
public class IntEvaluator implements TypeEvaluator<Integer> {
public Integer evaluate(float fraction, Integer startValue, Integer endValue) {
int startInt = startValue;
return (int)(startInt + fraction * (endValue - startInt));
}
}
自定义一个贝塞尔曲线的估值器：
class BezierEvaluator implements TypeEvaluator<PointF> {
@Override
public PointF evaluate(float fraction, PointF startValue, PointF endValue) {
float oneMinusT = 1.0f - fraction;
//startValue; //开始出现的点
//endValue; //结束终点
PointF controlPoint = new PointF(); //贝塞尔曲线控制点
controlPoint.set(mWidthPixels / 2 + 600, mHeightPixels / 2 - 300);
PointF point = new PointF(); //返回计算好的点
point.x = oneMinusT * oneMinusT * (startValue.x) + 2 * oneMinusT * fraction * (controlPoint.x) + fraction * fraction * (endValue.x);
point.y = oneMinusT * oneMinusT * (startValue.y) + 2 * oneMinusT * fraction * (controlPoint.y) + fraction * fraction * (endValue.y);
return point;
}
}
View 的 animate 方法
Android5.0后，view增加了 animate方法，供直接驱动view的属性动画。
view.animate()
.translationZ(15F).setDuration(300)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
view.animate()
.translationZ(1f) //require api 21
.setDuration(500).start();
}
})
.withEndAction(new Runnable() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
}
});
}
})
.start();
