How to answer incoming call programmatically in Android

Here is example for accepting incoming calls programmatically

The most stable version is using adb shell feature.

Call can be answered by sending command “adb shell input keyevent 79” via Terminal

Same thing can be done programmatically.

But, it works good for user-driven answering and this solution good for custom call screen.
It will not work for any sort of automated call-control-type applications.
Like auto answering via BroadcastReceivers etc.

try {
    Runtime.getRuntime().exec("input keyevent " + Integer.toString(KeyEvent.KEYCODE_HEADSETHOOK));
} catch (IOException e) {
   //handle error here
}

Awaiting comments. Let me know the better ways.