FloatingView can make the target view floating above the anchor view with cool animation
####2.类图
####3.漂浮动画
实现漂浮动画很简单，你只需要实现 [FloatingTransition][4] 接口就可以:
```java
public interface FloatingTransition {
public void applyFloating(YumFloating yumFloating);
}
```
在 `applyFloating` 方法，你可以使用 Android Animation 创建动画，然后使用 [YumFloating][6] 进行 Alpha,Scale,Translate,Rotate 等变换
如果你想加入 [Facebook Rebound][5] 回弹动画效果，你可以使用 [SpringHelper][7],例如 [ScaleFloatingTransition][8]:
```java
public class ScaleFloatingTransition implements FloatingTransition {
...
@Override
public void applyFloating(final YumFloating yumFloating) {
ValueAnimator alphaAnimator = ObjectAnimator.ofFloat(1.0f, 0.0f);
alphaAnimator.setDuration(duration);
alphaAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
yumFloating.setAlpha((Float) valueAnimator.getAnimatedValue());
}
});
alphaAnimator.start();
SpringHelper.createWidthBouncinessAndSpeed(0.0f, 1.0f,bounciness, speed)
.reboundListener(new SimpleReboundListener(){
@Override
public void onReboundUpdate(double currentValue) {
yumFloating.setScaleX((float) currentValue);
yumFloating.setScaleY((float) currentValue);
}
}).start(yumFloating);
}
}
```
如果 [SpringHelper][7] 无法满足你的需求，你可以直接使用 [YumFloating][6] 的 `createSpringByBouncinessAndSpeed(double bounciness, double speed)` 或者
`createSpringByTensionAndFriction(double tension, double friction)` 创建 Spring, 然后使用 `transition(double progress, float startValue, float endValue)` 进行数值转换
####4.路径漂浮动画
实现路径漂浮同样很简单，例如 [CurveFloatingPathTransition][9] ,首先你需要继承 [BaseFloatingPathTransition][10] 类.和继承 [FloatingTransition][4] 类不同的是，你需要再实现一个 `getFloatingPath()` 方法.
在 `getFloatingPath()` 方法内使用 `Path` 创建你想漂浮的路径，然后调用 `FloatingPath.create(path, false)` 进行返回. 例如 [CurveFloatingPathTransition][9] 实现：
```java
public class CurveFloatingPathTransition extends BaseFloatingPathTransition {
...
@Override
public FloatingPath getFloatingPath() {
if (path == null){
path = new Path();
path.moveTo(0, 0);
path.quadTo(-100, -200, 0, -300);
path.quadTo(200, -400, 0, -500);
}
return FloatingPath.create(path, false);
}
@Override
public void applyFloating(final YumFloating yumFloating) {
ValueAnimator translateAnimator;
ValueAnimator alphaAnimator;
translateAnimator = ObjectAnimator.ofFloat(getStartPathPosition(), getEndPathPosition());
translateAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
float value = (float) valueAnimator.getAnimatedValue();
PathPosition floatingPosition = getFloatingPosition(value);
yumFloating.setTranslationX(floatingPosition.x);
yumFloating.setTranslationY(floatingPosition.y);
}
});
...
}
}
```
使用 Path 将你想要漂浮的路径的描绘出来，然后在 `applyFloating(final YumFloating yumFloating)` 方法中:
* 使用 `getStartPathPosition()` 方法获取路径的开始位置
* 使用 `getEndPathPosition()`方法获取路径的结束位置
* 使用 `getFloatingPosition(float progress)` 获取当前进度的位置
`getFloatingPosition(float progress)` 方法会返回一个 `PathPosition` 对象，其属性 x,y 分别代表当前路径动画的 x 坐标，和 y 坐标.
Release Log
-----------
#### v1.0.2
[修复 bug](https://github.com/UFreedom/FloatingView/pull/6)
#### v1.0.1
初始版本
License
--------
Copyright 2015 UFreedom
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
[1]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/FloatingBuilder.java
[2]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/FloatingElement.java
[3]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/Floating.java
[4]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/transition/FloatingTransition.java
[5]:http://facebook.github.io/rebound/
[6]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/transition/YumFloating.java
[7]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/spring/SpringHelper.java
[8]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/effect/ScaleFloatingTransition.java
[9]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/effect/CurveFloatingPathTransition.java
[10]:https://github.com/UFreedom/FloatingView/blob/master/FloatingViewLib/src/main/java/com/ufreedom/floatingview/transition/BaseFloatingPathTransition.java