Question

i have 3 ArrayList> that I want to pass to 3 fragments. Besides making them static, what is the best approach to do this?

Answer 1

You can create listener callback interfaces and implement them in your fragments. Something like this:

@Override
public void onSomeEvent(List<SomeData> data) {
    //do something with data
}

In your activity create this interface:

public interface OnSomeEventListener {
    onSomeEvent(List<SomeData> data);
}

then obtain your fragment by using findFragmentById or findFragmentByTag and assign it to a listener:

this.onSomeEventListener = fragment; 

You can then call methods of that interface and your fragment will receive callbacks.

The second and more easier way of communication between fragments and activities is BroadcastReceivers. You can register some BroadcastReceiver in your fragments and then call sendBroadcast() from activity. Your list of data can be put in a bundle of that broadcast message.