KProxy answer - answer your phone without touch. The app uses the proximity sensor to answer so you can answer just cover the sensor.
You can also end a call using the app. Shake your phone from right to left a few times to end a call.

Please be aware
The app work in the foreground mode. That means higher battery consumption.
If you using a phone from Meizu Xiaomi Huawei then the application can not work on your phone