LibGDX 中 music.class 的 TweenAccessor
我一直在想:是否可以在 LibGDX 中使用 Universal Tween Engine 来改变歌曲的音量?我用类似于我的 SpriteAccessor 的代码编写了我自己的 MusicAccessor，它实际上适用于 Sprite.class，但是当涉及到音乐对象时 - 它总是得到相同的错误:
I've been wondering: is it possible to use Universal Tween Engine in LibGDX to - for example - change the volume of a song? I wrote my own MusicAccessor with code similar to my SpriteAccessor, which actually works for Sprite.class, but when it comes to music objects - it always gets the same error:
java.lang.RuntimeException: No TweenAccessor was found for the target
问题是，我确实通过以下方式注册了我的访问器:Tween.registerAccessor(Music.class,new MusicAccessor()); 我很确定它实际上已被注册为 System.out.println(Tween.getRegisteredAccessor(Music.class)); 打印:the.name.of.my.packages.MusicAccessor@14bb523.老实说，我被困住了.
The thing is, I DO register my accessor by: Tween.registerAccessor(Music.class,new MusicAccessor()); I'm quite sure it's actually being registered, as System.out.println(Tween.getRegisteredAccessor(Music.class)); prints: the.name.of.my.packages.MusicAccessor@14bb523. Honestly, I'm stuck.
音乐文件本身是 .mp3 格式，我通过资产管理器加载它.
The music file itself is in .mp3 format and I load it by an asset manager.
所以，我的问题是:为什么 Tween 引擎无法正确识别我的音乐对象的类别?有没有办法让它工作，或者我是否坚持使用常规计时器来随着时间的推移改变音量?更改格式或以不同的方式加载音乐文件会有帮助吗?
So, my questions are: why the Tween Engine cannot correctly recognise the class of my music object? Is there a way to make it work or am I stuck with regular timers to change the volume over time? Would changing the format or loading the music file in a different way help?
推荐答案
我个人还没有使用过 Tween Engine，但我想可能是因为 Music 实际上只是一个界面.
I personally haven't used Tween Engine myself yet, but I think it might be because Music is actually just an interface.
对于不同的后端和不同的文件格式有几种实现.例如 AndroidMusic、GwtMusic 以及 OpenALMusic 的另外三个实现(它们都称为 Music，位于com.badlogic.gdx.backends.openal.mp3/ogg/wav 包).您可以使用访问器将它们全部注册，也可以使用 Tween.cast() 我在代码中找到的，但在补间引擎的官方JavaDoc中没有.可能只有最新版本.
There are several implementations for the different backends and different file formats. For example AndroidMusic, GwtMusic, and three more implementations of OpenALMusic (they are all called Music and are located in the com.badlogic.gdx.backends.openal.mp3/ogg/wav packages). You could either register them all with your accessor, or you can use Tween.cast() which I found in the code, but not in the official JavaDoc of the tween engine. It might be only in the latest version.
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