在Android上对视图背景颜色进行动画处理 [英] Animate change of view background color on Android

问题描述

如何在Android上为视图背景颜色的变化设置动画？

How do you animate the change of background color of a view on Android?

例如：

我有一个红色背景的视图。视图的背景颜色变为蓝色。我该如何在颜色之间进行平滑过渡？

I have a view with a red background color. The background color of the view changes to blue. How can I do a smooth transition between colors?

如果无法通过视图完成操作，将欢迎使用替代方法。

If this can't be done with views, an alternative will be welcome.

推荐答案

我最终想出了一个解决这个问题的（非常好的）解决方案！

I ended up figuring out a (pretty good) solution for this problem!

您可以使用 TransitionDrawable 即可实现。例如，在drawable文件夹中的XML文件中，您可以编写如下内容：

You can use a TransitionDrawable to accomplish this. For example, in an XML file in the drawable folder you could write something like:

<?xml version="1.0" encoding="UTF-8"?>
<transition xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- The drawables used here can be solid colors, gradients, shapes, images, etc. -->
    <item android:drawable="@drawable/original_state" />
    <item android:drawable="@drawable/new_state" />
</transition>

然后，在XML中获取实际的View，您可以在 android：background 属性。

Then, in your XML for the actual View you would reference this TransitionDrawable in the android:background attribute.

这时，您可以通过以下方式在代码中启动转换：

At this point you can initiate the transition in your code on-command by doing:

TransitionDrawable transition = (TransitionDrawable) viewObj.getBackground();
transition.startTransition(transitionTime);

或通过调用以下命令进行反向转换：

Or run the transition in reverse by calling:

transition.reverseTransition(transitionTime);

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请参见罗马人针对使用Property Animation API的另一种解决方案的答案，该解决方案最初发布时尚不可用。

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See Roman's answer for another solution using the Property Animation API, which wasn't available at the time this answer was originally posted.

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