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EventBus is a publish/subscribe event bus optimized for Android.
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so make it simple,just think EventBus as a framework that allow different compoents to communicate,
usually a subscribe register a certain event,then whenever a publisher has post an event,any subscribes who had register this event will be able to receive the notify.
This is an example,Let's say MainActivity is a subscribe who has register to receive RecvEvent event,
And Second Activity is a publicer who will post a RecvEvent when his btn is clicked.Theoretically speaking,MainActivity is able to recevie the event that posted by SecondActivity.
//From above,we know that EventBus contains three objects:Event,Subscribe,Publisher
//Event public class RecvEvent { private final String info; public RecvEvent(String info) { this.info = info; } public String getInfo() { return info; } } //Subscribe:MainActivity public class MainActivity extends AppCompatActivity { private TextView tvShowInfo; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tvShowInfo = (TextView)findViewById(R.id.tvShowRecv); //register to recevie ShowRecvEvent event EventBus.getDefault().register(this); } @Override protected void onDestroy() { super.onDestroy(); //destroy res EventBus.getDefault().unregister(this); } @Subscribe(threadMode = ThreadMode.MAIN) public void onRecvEvent(ShowRecvEvent event) { tvShowInfo.setText(event.getInfo()); } public void onJump(View view) { startActivity(new Intent(this,SecondActivity.class)); } } //publisher:SecondActivity public class SecondActivity extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.second_activity); } public void onSend(View view) { EventBus.getDefault().post(new ShowRecvEvent("this is from second activity")); } }