EventBus Usage

EventBus is a publish/subscribe event bus optimized for Android.

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

//Eventpublic class RecvEvent{private final String info;public RecvEvent(String info){ this.info = info;}public String getInfo(){return info;}}//Subscribe:MainActivitypublic 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:SecondActivitypublic 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"));    }}

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