Android Networking: Fundamentals

Sep 6 2022 · Kotlin 1.6, Android 12, Android Studio Chipmunk | 2021.2.1 Patch 1

Part 1: Learn About HTTP & Threading

03. Connect to the Internet

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Notes: 03. Connect to the Internet

The student materials have been reviewed and are updated as of July 2022.

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Fetching data from a server requires an Internet connection.

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
class NetworkStatusChecker(private val connectivityManager: ConnectivityManager?) {

}
class NetworkStatusChecker(private val connectivityManager: ConnectivityManager?) {

  inline fun performIfConnectedToInternet(action: () -> Unit) {
    if (hasInternetConnection()) {
      action()
    }
  }
}
class NetworkStatusChecker(private val connectivityManager: ConnectivityManager?) {

  inline fun performIfConnectedToInternet(action: () -> Unit) {
    if (hasInternetConnection()) {
      action()
    }
  }

  // HERE
  fun hasInternetConnection(): Boolean {
    val network = connectivityManager?.activeNetwork ?: return false
    val capabilities = connectivityManager.getNetworkCapabilities(network) ?: return false
  }
}
class NetworkStatusChecker(private val connectivityManager: ConnectivityManager?) {

  inline fun performIfConnectedToInternet(action: () -> Unit) {
    if (hasInternetConnection()) {
      action()
    }
  }

  // HERE
  fun hasInternetConnection(): Boolean {
    val network = connectivityManager?.activeNetwork ?: return false
    val capabilities = connectivityManager.getNetworkCapabilities(network) ?: return false

    return capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
        || capabilities.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR)
        || capabilities.hasTransport(NetworkCapabilities.TRANSPORT_VPN)
  }
}