Network error handler code refactoring

[Harsh2098]

A) Change nested ifs in all fragments to if-else-if ladder.

if (!ConnectionUtils.getConnectionInfo(context)) {
     uiThread { networkDownHandler.onNetworkDownError(resources.getString(R.string.error_check_internet)) }
} else if (!ConnectionUtils.isReachableByTcp(Constants.HOST, Constants.PORT)) {
     uiThread { networkDownHandler.onNetworkDownError(resources.getString(R.string.error_server_down)) }
} else {
    // Do actual thing
}

B) Apart from having RETRY button in that non cancellable (.setCancelable(false)) dialog box which you would be displaying from MainActivity, you can automatically detect if internet is available again by doing this:-

1. Add new module to dagger (it'll make MainActivity.kt short)

@Module
class ConnectivityModule {
    @Provides
    @BingoApplicationScope
    internal fun getConnectivityManager(context: Context) = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager

    @Provides
    @BingoApplicationScope
    fun getNetworkRequest() = NetworkRequest.Builder().addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
            .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR).build()
}

1. Inject these 2 things in MainActivity:-

@Inject
    lateinit var connectivityManager: ConnectivityManager

    @Inject
    lateinit var networkRequest: NetworkRequest

1. In MainActivity.kt in onResume()
connectivityManager.registerNetworkCallback(networkRequest, networkCallback)
2. In MainActivity.kt in onPause()
connectivityManager.unregisterNetworkCallback(networkCallback)
3. Create networkCallback object like this:-

networkCallback = object : ConnectivityManager.NetworkCallback() {

            override fun onAvailable(network: Network) {
                super.onAvailable(network)
                runOnUiThread {
                    // Do something ....
                }
            }

            override fun onLost(network: Network) {
                super.onLost(network)
                // Do something as network lost
            }
        }

[Harsh2098]

Part B in the above mentioned comment has been implemented.