I am a fresher UI/UX designer. My APP icon is showing blur and I am using photoshop 72 resolution and please tell me about android & ios icon measurement, Resolution and size.
Ideally, you should create an icon at 300 dpi and a size larger than what you would require. (like 400x400)
You can then use one of the many freely available online tools to generate (downsize) your icon to the Android/iOS sizes.
Example, for iOS, you can use: