问题
I need to change or customize the call screen when initiating a call on Android.
After searching on google I do not find any way to do it.
There is no way to send DTMF tones during a call, the idea is to send a specific number to the call screen. So when a call is made is possible to see the number to dial during a call to the PBX.
I tried to putting the number in the "status bar", but the notification hide after seconds and it is not practical.
回答1:
It could be possible to show a toast message or a dialog in front of the call screen from a background process I think.
This won't look nice but would be a way to do it.
回答2:
I need to change or customize the call screen when initiating a call on Android.
This is not possible, the call screen can not be customised or changed unless you are building your own ROM.
There is no way to send DTMF tones during a call
You can add a dtmf sequence to the end of a dial intent to send dtmf straight after a call has connected but not during a call.
I appreciate any other suggestion.
You could try to overlay the number in some way but I'm not quite sure what you actually want to achieve so that suggestion may be incorrect
来源：https://stackoverflow.com/questions/2652910/change-call-screen