Allow Calling api from ionic android app

I’m building ionic3 application , I have API, I want to connect to this API by http requests,
I build http request it working well in browser but on android device or emulator there is no action.
so, Is there is any special settings must set in app config to allow this ???

Did you remote debug the problem on the device already? Follow these instructions here to debug the problem in Chrome dev tools: Look at the console and network tabs for errors.