Sending and receiving broadcast messages enables inter activity communication. Suppose in activity A you have completed a task and you want activity B to react accordingly, then broadcasting helps a lot. A only needs to initialize an intent and send it via a broadcast message. B needs to set a filter to get the specific messages from A and register a receiver, where the actions upon receving messages are defined. 

In activity A, the message can be sent this way

Intent broadcastI=new Intent();broadcastI.setAction("edu.hkust.cse.phoneAdapter.ruleChange");sendBroadcast(broadcastI);

In activity B, the filter and receiver 
IntentFilter filter=new IntentFilter("edu.hkust.cse.phoneAdapter.ruleChange");this.registerReceiver(new BroadcastReceiver() {        @Override    public void onReceive(Context arg0, Intent arg1) {        Toast.makeText(getApplicationContext(), "msg received", Toast.LENGTH_SHORT).show();    }},filter);

Easy, right?


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