Android create and register BroadcastReceiver within Activity

The broadcast receiver is created and registered in the onCreate function of the activity, and it is unregistered in the onDestory function. By creating the broadcast receiver within the activity, the logic in the onReceive function can be tailored specifically for this activity.

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
import android.content.Intent
import android.content.BroadcastReceiver
import android.content.Context
import android.content.IntentFilter
import android.widget.Toast

class MainActivity : AppCompatActivity() {
    companion object {
        val ACTION1 = "com.example.broadcastreceiverwithinactivity.Greeting1"
        val ACTION2 = "com.example.broadcastreceiverwithinactivity.Greeting2"
    }

    private lateinit var receiver : BroadcastReceiver
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // create the broadcast receiver and register it with this activity
        // By creating the broadcast receiver within the activity, 
        // the logic in the onReceive function can be tailored specifically for this activity
        val filter = IntentFilter()
        filter.addAction(ACTION1)
        filter.addAction(ACTION2)
        receiver = object : BroadcastReceiver() {
            override fun onReceive(context: Context, intent: Intent) {
                if (intent.action == ACTION1) {
                    Toast.makeText(applicationContext, "Greeting 1", Toast.LENGTH_SHORT).show()
                } else if (intent.action == ACTION2) {
                    Toast.makeText(applicationContext, "Greeting 2", Toast.LENGTH_SHORT).show()
                }
            }
        }
        registerReceiver(receiver, filter)




        // button click listeners, send broadcast when clicked
        btn_send_broadcast1.setOnClickListener {
            val intent = Intent()
            intent.action = ACTION1
            sendBroadcast(intent)
        }

        btn_send_broadcast2.setOnClickListener {
            val intent = Intent()
            intent.action = ACTION2
            sendBroadcast(intent)
        }
    }

    // unregister the broadcast when the activity is about to get destroyed
    override fun onDestroy() {
        unregisterReceiver(receiver)
        super.onDestroy()
    }
}

activity_main.xml

Complete example in Github