Android Networking: Fundamentals
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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)
}
}