how can i start a service while on call in android

public class CustomPhoneStateListener extends PhoneStateListener {

//private static final String TAG = "PhoneStateChanged";
Context context; //Context to make Toast if required
public CustomPhoneStateListener(Context context) {
super();
this.context = context;
}

@Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);

switch (state) {
case TelephonyManager.CALL_STATE_IDLE:
//when Idle i.e no call
Toast.makeText(context, "Phone state Idle", Toast.LENGTH_LONG).show();
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
//when Off hook i.e in call
//Make intent and start your service here
Intent intent= new Intent();

break;
case TelephonyManager.CALL_STATE_RINGING:
//when Ringing
Toast.makeText(context, "Phone state Ringing", Toast.LENGTH_LONG).show();
break;
default:
break;
}
}


I have a service that implements a floating widget, how do i start that service only when a person is on a call

context.startService()

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