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Event Buses


Used for efficient and simple delivery of messages within you application. It's an alternative to LocalBroadcastManager.

  • Simple to use
  • Can send any arbitrary object (doesn't need to be Parceable / Serializable / Bundle)
  • Very efficient - objects are pooled and no new instances are created during delivery
  • Uses standard Android Handler for message delivery
  • Messages are always delivered to the main UI thread
  • No Context needed
  • Lightweight - just one main class (LocalMessageManager)

Comparision with LocalBroadcastManager

  • Less complex code (compare with LocalBroadcastManager source)
  • No need to use a Bundle to transfer the data and add unnecessary string keys
  • Doesn't create any new instances, less impact on Garbage Collector
  • No need to define IntentFilters / Actions
  • Less error prone due to more straighforward API

How to implement

You can send a message from anywhere. If you don't need any parameters, just use:


(The message ID is an integer. You can use simple constants or Android IDs or anything else).

If you want to send an arbitrary object:

LocalMessageManager.getInstance().send(R.id.msg_sample_event, new MyCustomObject());

(you can also send a simple integer argument or a Bundle)

Register receiver. In case of an Activity this is usually onStart(), or onCreate(). You can also put this code into your base activity or fragment.


You can listen to all events or add only a listener to a specific message ID.

Unregister receiver. In case of an Activity this is usually in onStop() or onDestroy(). You can also put this code into your base activity or fragment.


Create a listener or let your class implement LocalMessageCallback.

public void handleMessage(@NonNull final LocalMessage msg) {
    switch (msg.getId()) {
        case R.id.msg_sample_event : {
            mTextView.setText("Received simple event");


Grab via Gradle:

compile 'eu.inloop:localmessagemanager:0.1.7'

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