Android - How to immediately endCall with telephonyService?

问题

In my application, there's a feature that ends outgoing call (and starts other activities) while dialing a certain number (e.g. *123*)

It's currently working, but requires a 200ms delay. Without the delay, the intent cannot be recieved.

The delay causes a consequence of multiple screen flickers:

my activity shows -> switch to call -> end call -> switch back to my activity

public class OutgoingCallListener extends BroadcastReceiver {
    // ...
    public void onReceive(final Context context, Intent intent) {
        // ...
        if(intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)) {
            // ...
            if(number.equals("*123*")) {
                // ...
                Handler handler = new Handler();
                handler.postDelayed(new Runnable() {
                    public void run() {
                        telephonyService.endCall();
                    }
                }, 200);
            }
        }
    }
}

I'v seen other applications with this special-number-dialing feature, the call ends immediately wihout the end-call-beep, and switches to app activity without flickering.

Q1: Does anyone know how to end call without delay? Is there another intent that we can catch before ACTION_NEW_OUTGOING_CALL?

Q2: On a mobile phone with low specs (slow CPU, less memory), would BroadcastReceiver work the same way as on a decent phone?

回答1:

Got the answer...

To end an outgoing call immediately, we don't even need to call endCall() from ITelephony, instead, we can simply use setResultData(null);

It's different from manually ending a call or using endCall, with setResultData(null):

No notification icon or message
No calling screen
No call time toast
No call log
No end call beep

It's just like nothing happened (if...without any other extra activities).

public class OutgoingCallListener extends BroadcastReceiver {
    // ...
    public void onReceive(final Context context, Intent intent) {
        // ...
        if(intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)) {
            // ...
            if(number.equals("*123*")) {
                setResultData(null);
                // start other activities
            }
        }
    }
}