Android Broadcast Sending app's package name

I am aware of how BroadcastReceiver feature/functionality works in Android and I've implemented multiple actions that my app will either receive or send.

However, whenever one of my applications receives a broadcast I want to know which application sent that broadcast.

Example (I have three applications):
Application A and Application B are allowed to send a broadcast to Application C.

When Application C receives the broadcast, I want to know which application sent this broadcast, either Application A or Application B?

Note: I am aware that I can add a extra in the Intent and send the package name however I am looking for a field that is "auto-generated". I do not want to do the following each time:

intent.putExtra("package_name", getPackageName());

Reason, you ask? Above is just an example. There could be more than two applications sending broadcasts and I don't want them to send package name in the Intent each time.

I also noticed there is getPackage() method for Intent, however that always returns null.

@Override
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();

    switch (action) {
        case MY_GLOBAL_ACTION:
            // this is where I want the package name of the application that sent the broadcast
            intent.getPackage(); // this is always null
            break;
        default:
            break;
    }
}

I want to know which application sent this broadcast, either Application A or Application B?

Add it as an extra.

I am looking for a field that is "auto-generated".

There is none. By default, an Intent does not contain information about the app that created the Intent, any more than a HashMap does.

I also noticed there is getPackage() method for Intent, however that always returns null.

Presumably, that is because you are not calling setPackage(). And, since that package does not identify the sender, it will not help you.