arrow does not shown above version 2.4.0

Version 2.4.0 is the last one where I can see the arrow. For newer Versions I only see white where it should be.
I also tried the following:
```
val img : ImageView = ccp.findViewById(R.id.imageView_arrow)
img.setBackgroundColor(0x3A3535)
img.visibility = View.VISIBLE
```
But the arrow just does not want to show up above 2.4.0.

Also with all of the versions I tested I get a compilation error when I try to set the attribute ccpDialog_backgroundColor.

使用报告中的 `R.id.imageView_arrow` 查找方式，在高于 2.4.0 的版本中复现缺失的箭头，并与 2.4.0 进行比较。检查 `ccpDialog_backgroundColor` 的声明和使用方式；当箭头在较新版本中正常渲染，并且属性在配置后能够编译时，即表示完成。

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