一个电话打出去的流程 （去电话代码流程）

1. TwelveKeyDialer.java, onKeyUp()2. TwelveKeyDialer.java, placeCall()3. OutgoingCallBroadcaster.java, onCreate()    sendOrderedBroadcast(broadcastIntent, PERMISSION,                new OutgoingCallReceiver(), null, Activity.RESULT_OK, number, null);4. OutgoingCallBroadcaster.java, OutgoingCallReceiver    doReceive -> context.startActivity(newIntent);5. InCallScreen.java, onCreate/onNewIntent6. InCallScreen.java, placeCall7. PhoneUtils.java, placeCall8. GSMPhone.java, dial9. GsmCallTracker.java, dial10. RIL.java, dial      RILRequest rr = RILRequest.obtain(RIL_REQUEST_DIAL, result);      ...      send(rr);