在非繼承自Activity的類別內顯示 toast
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## Ref.
[在非繼承自Activity的類別內顯示toast](https://medium.com/@leowang0308/android-%E5%9C%A8%E9%9D%9E%E7%B9%BC%E6%89%BF%E8%87%AAactivity%E7%9A%84%E9%A1%9E%E5%88%A5%E5%85%A7%E9%A1%AF%E7%A4%BAtoast-457b3a677ced)

###### tags: `實作相關`