- // This must run asynchronously because it involves a network request. `String` declares the parameters. `Void` does not declare progress units. `String` contains the results.
- private static class GetHostIpAddresses extends AsyncTask<String, Void, String> {
- // The weak references are used to determine if the activity have disappeared while the AsyncTask is running.
- private final WeakReference<Activity> activityWeakReference;
-
- GetHostIpAddresses(Activity activity) {
- // Populate the weak references.
- activityWeakReference = new WeakReference<>(activity);
- }
-
- // `onPreExecute()` operates on the UI thread.
- @Override
- protected void onPreExecute() {
- // Get a handle for the activity.
- Activity activity = activityWeakReference.get();
-
- // Abort if the activity is gone.
- if ((activity == null) || activity.isFinishing()) {
- return;
- }
-
- // Set the getting IP addresses tracker.
- gettingIpAddresses = true;
- }
-
-
- @Override
- protected String doInBackground(String... domainName) {
- // Get a handle for the activity.
- Activity activity = activityWeakReference.get();
-
- // Abort if the activity is gone.
- if ((activity == null) || activity.isFinishing()) {
- // Return an empty spannable string builder.
- return "";
- }
-
- // Initialize an IP address string builder.
- StringBuilder ipAddresses = new StringBuilder();
-
- // Get an array with the IP addresses for the host.
- try {
- // Get an array with all the IP addresses for the domain.
- InetAddress[] inetAddressesArray = InetAddress.getAllByName(domainName[0]);
-
- // Add each IP address to the string builder.
- for (InetAddress inetAddress : inetAddressesArray) {
- if (ipAddresses.length() == 0) { // This is the first IP address.
- // Add the IP address to the string builder.
- ipAddresses.append(inetAddress.getHostAddress());
- } else { // This is not the first IP address.
- // Add a line break to the string builder first.
- ipAddresses.append("\n");
-
- // Add the IP address to the string builder.
- ipAddresses.append(inetAddress.getHostAddress());
- }
- }
- } catch (UnknownHostException exception) {
- // Do nothing.
- }
-
- // Return the string.
- return ipAddresses.toString();
- }
-
- // `onPostExecute()` operates on the UI thread.
- @Override
- protected void onPostExecute(String ipAddresses) {
- // Get a handle for the activity.
- Activity activity = activityWeakReference.get();
-
- // Abort if the activity is gone.
- if ((activity == null) || activity.isFinishing()) {
- return;
- }
-
- // Store the IP addresses.
- currentHostIpAddresses = ipAddresses;
-
- if (!urlIsLoading) {
- checkPinnedMismatch();
- }
-
- // Reset the getting IP addresses tracker.
- gettingIpAddresses = false;
- }
- }
-