blocks|key|4664851|text|我认为这是可以实现的，至少在某个时候是可以实现的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4664852|您可以访问一个相当完整的Animations+API。最后，再加上一些视图边界、距离和可能的设备方向计算，几乎可以用来模拟您提到的所有情况。|offset|length|4664853|您可以创建加速/减速、形状更改...和几乎任何你想要的动画。|4664854|你如何实现你所要求的：|4664855|具有不同的动画，一个接一个，根据视图项状态动态地创建和应用它们。状态，我指的是“物理状态”：坠落，碰撞，与另一个视图接触，等等……|4664856|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/guide/topics/graphics/overview.html^0|0|C|E|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

I think this can be achieved, at least at some point.

You have access to a pretty complete <a href="http://developer.android.com/guide/topics/graphics/overview.html" rel="nofollow">Animations API</a>. This last, together with some view bounds, distance, and probably device orientation calculations, can be used to simulate almost all the cases you mentioned.

You can create Accelerate/Decelerate, form change... and almost whatever animation you want.

How you can achieve what you are asking for: 
Having different animations, one after another, creating and applying them dynamically depending on the view item state. And by state, I mean the "physical state": falling, collisioning, in touch with another view, and so on...

blocks|key|4664868|text|只要你可以在每个框架中设置/更新UI元素的位置(例如，使用View.setTranslationX())，你就可以做到。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4664869|手动设置UI动画将意味着保持UI元素和对应于它们的物理(例如jbox2d)主体之间的映射。然后将UI元素的相应位置更新为模拟身体的每个帧的位置(如body.getPosition())。|4664870|在事件驱动的应用程序中，像Timer对象这样的东西对于调度物理更新很有用。|4664871|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

As long as you can set/update the position of the UI elements every frame (e.g. with View.setTranslationX()), you can do it. 

Animating the UI by hand would mean keeping a mapping between the UI elements and the physical (e.g. jbox2d) bodies that correspond to them. Then you update the respective positions of the UI elements to what the simulated bodies have each frame (such as body.getPosition()). 

In event-driven apps, something like a Timer object is useful for scheduling the physics updates.

blocks|key|158633|text|最简单的方法(不是很灵活)是使用ViewPropertyAnimator。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|158634|使用它，您甚至可以并行地对属性进行动画处理。也许你想从父级左边更改视图边距。您可以在那里更改边距，设置移动的时间等。Some+examples+on+this+blog|158635|ValueAnimator是另一种选择，它默认使用AccelerateDecelerateInterpolator，您必须提供更改所需属性的代码。This+official+guide+may+suffice+to+get+them+working。|158636|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/view/ViewPropertyAnimator.html|1|http://android-developers.blogspot.com.ar/2011/05/introducing-viewpropertyanimator.html|2|http://developer.android.com/reference/android/animation/ValueAnimator.html|3|http://developer.android.com/guide/topics/graphics/prop-animation.html#value-animator^0|G|K|0|0|1M|Q|1|0|0|D|2|21|1F|3|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]|$A|17|B|18|1|19]]|C|$]]|$1|H|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]|R|$5|K|L|M|C|$N|S]]|T|$5|K|L|M|C|$N|U]]]]

The easiest way (not that flexible) is using <a href="http://developer.android.com/reference/android/view/ViewPropertyAnimator.html" rel="nofollow" title="ViewPropertyAnimator">ViewPropertyAnimator</a>.

With it you can animate properties even in parallel. Maybe you want to change a view margin from the parent left. You can change that margin there, setting up the time to move and else. <a href="http://android-developers.blogspot.com.ar/2011/05/introducing-viewpropertyanimator.html" rel="nofollow">Some examples on this blog</a>

<a href="http://developer.android.com/reference/android/animation/ValueAnimator.html" rel="nofollow">ValueAnimator</a> is other alternative, which uses the AccelerateDecelerateInterpolator by default and you have to provide the code that changes the property you need. <a href="http://developer.android.com/guide/topics/graphics/prop-animation.html#value-animator" rel="nofollow">This official guide may suffice to get them working</a>.

I currently have an android application that utilises the native android views for the UI (e.g. imageviews/buttons etc)

Although this app is not a game, nor requires any heavy graphics or OpenGL, I would like to incorporate a little physics-related interaction. Nothing too significant but maybe display minor collisions/bounces, deceleration/acceleration or possibly friction.

Is this possible to simulate either within the android framework or using an external physics library like jbox2d without having to utilize an entire game engine (like andengine, libgx etc).

P.S. this is for API 15+

Thanks all.

Applying physics to Android View objects

游戏引擎

我目前有一个android应用程序，它使用UI的原生android视图(例如，imageviews/按钮等)虽然这个应用程序不是游戏，也不需要任何沉重的图形或OpenGL，但我想纳入一点与物理相关的互动。没有太大的影响，但可能会显示轻微的碰撞/反弹、减速/加速或可能的摩擦。是否可以在android框架内或使用外部物理库...

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