OutgoingCallBroadcaster启动InCallScreen流程

OutgoingCallBroadcaster：接收ACTION_CALL的信息，别且对紧急电话和普通电话进行分析，启到一个过滤的作用；

InCallScreen：打电话和接电话的界面；

无论是普通电话还是紧急电话都会启动InCallScreen界面；

流程：

1、OutgoingCallBroadcaster.class

startSipCallOptionHandler(....){

..........

Intent selectPhoneIntent = new Intent(ACTION_SIP_SELECT_PHONE, uri);
selectPhoneIntent.setClass(context, SipCallOptionHandler.class);
selectPhoneIntent.putExtra(EXTRA_NEW_CALL_INTENT, newIntent);
selectPhoneIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

context.startActivity(selectPhoneIntent);  //启动了SipCallOptionHandler.class

}

2、SipCallOptionHandler.class

setResultAndFinish() {

........

PhoneApp.getInstance().callController.placeCall(mIntent);

.........

}

3、CallController.class

placeCall(Intent intent) {

........

mApp.displayCallScreen();  //mApp = PhoneApp app;

}

4、PhoneApp.class

displayCallScreen() {

.......

startActivity(createInCallIntent());

}

static Intent createInCallIntent() {
Intent intent = new Intent(Intent.ACTION_MAIN, null);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS
| Intent.FLAG_ACTIVITY_NO_USER_ACTION);
intent.setClassName("com.android.phone", getCallScreenClassName());
return intent;
}

static String getCallScreenClassName() {
return InCallScreen.class.getName();
}