Can I prevent the screen from turning on for an incoming phone call?

I have seen questions that are somewhat similar to this, but none that answer this question. If I wanted to be able to prevent the screen from turning on at all when receiving an incoming call, is this possible? I know it may sound bizarre, but i开发者_JAVA技巧t would only act this way exactly when the user would want it to, particularly at night, and they would be well aware of this behavior.

I'd still want it to turn on if they pressed the unlock button of course, just not when receiving an incoming call.

I've experimented with Screen Brightness and Screen Timeout, but it still turns on the screen while the call is ringing. I would like it to act similarly to when you receive a notification message, where you see the blinking indicator, but the screen never turns on.

Thanks a lot in advance for the help, I appreciate it! Paul

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May I ask why do you need this?

I don't think it's possible, a malicious app could hide calls. Using the unlock button during a call would also interfere with existing functions, (muting the ringer without hanging up). If you don't want to receive calls, turn on the airplane mode but I guess this isn't what you need.

(fun fact: on a Nexus One, the trackball blinks white while receiving a call so turning off the screen wouldn't matter, it would still light up the whole room...)