.kt

/* a working example of Network Connectivity check for a small project without any modern architecture pattern used */

private var broadcastReceiver: BroadcastReceiver = object : BroadcastReceiver() {
        override fun onReceive(context: Context, intent: Intent) {
            val notConnected = intent.getBooleanExtra(ConnectivityManager
                    .EXTRA_NO_CONNECTIVITY, false)
            if (notConnected) {
                showErrorLayout()
            } else {
                retryRequest()
            }
        }
    }

    override fun onResume() {
        super.onResume()
        registerReceiver(broadcastReceiver, IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION))
    }

    override fun onPause() {
        super.onPause()
        unregisterReceiver(broadcastReceiver)
    }

    private fun showErrorLayout() {
        recycler_error_layout.visibility = View.VISIBLE
        rv_items.visibility = View.GONE
    }

    private fun retryRequest() {
        recycler_error_layout.visibility = View.GONE
        rv_items.visibility = View.VISIBLE
        refreshRecyclerViewData() // if this is a liveData observable used with ViewModel
                                 // then network request will happen even if you press `home screen button`
                                // which kills the liveData + viewmodel approach (as I understand it)
    }