Communication between nested fragments in Android

Question

I recently learned how to make nested fragments in Android. I don\'t know how communication is supposed to happen, though.

From reading the fragment commun

Answer 1

Although @Suragch's answer is correct, But I want to add another way to pass data between Fragments or Activity. No matter it's an Activity or Fragment you can pass data with event bus in 3 steps:

1- Define an event(message):

public class OrderMessage {
    private final long orderId;
    /* Additional fields if needed */
    public OrderMessage(long orderId) {
        this.orderId = orderId;
    }
    public long getOrderId() {
        return orderId;
    }
}

2- Register and Unregister for Events: To be able to receive events, the class must register/unregister for event bus. The best place for Activities and Fragments is onStart() and onStop()

@Override
public void onStart() {
    super.onStart();
    EventBus.getDefault().register(this);
}

@Override
public void onStop() {
    EventBus.getDefault().unregister(this);
    super.onStop();
}

To be able to receive an event you have to subscribe to that event. To do that, add @Subscribe annotation to one of your methods in your class.

@Subscribe(threadMode = ThreadMode.MAIN)
   public void onMessage(OrderMessage message){
       /* Do something for example: */
       getContractDetails(message.getOrderId());
   }

3- Post an event

EventBus.getDefault().post(new OrderMessage(recievedDataFromWeb.getOrderId()));

More documentation and examples could be found Here. There are also other libraries like : Otto