Question

I have an application that accesses a server. I have many activities that access the server for data. At various points in the application, I do a simple check to verify two things, 1) There is internet connectivity and 2) The server is not in maintenance mode or down.. If it is, I display an Activity detailing why and when the server will be back up.

When a user clicks back in this “Server is down” Activity, I need to exit the application. I have tried the following code/intent to call the “Server Down” activity but it doesn’t work.

Intent i = new Intent(this, ServerMaintenanceActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);

I have looked all over and this is a very common problem faced with people typically on login/logout screens. None of the solutions I find works for me. I know it’s possible because I have apps that do just this for example Spotify.

Any ideas? Thanks.

Answer 1

Whenever you start an activity, you can create new ResultReceiver then put it into a list, in a global helper class. Then, in your notification activity (telling the user “Server is down”), override onDestroy() and send request to finish others.

For example:

• Helper class:

  public static final int REQUEST_FINISH = 1;
  
  private static final List<ResultReceiver> mClients = new ArrayList<ResultReceiver>();
  
  public static void registerClient(ResultReceiver receiver) {
      mClients.add(receiver);
  }
  
  public static void unregisterClient(ResultReceiver receiver) {
      mClients.remove(receiver);
  }
  
  public static void finishApp() {
      for (ResultReceiver client : mClients)
          client.send(REQUEST_FINISH, null);
  }
  

• Other activities:

  private ResultReceiver mCommandHandler;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
  
      // ...
  
      mCommandHandler = new ResultReceiver(null) {
  
          @Override
          public void onReceiveResult(int resultCode, Bundle resultData) {
              if (resultCode == Helper.REQUEST_FINISH) {
                  // do some other stuffs...
  
                  finish();
              }
          }
      };
  
      Helper.registerClient(mCommandHandler);
  }// onCreate()
  
  @Override
  protected void onDestroy() {
      super.onDestroy();
      Helper.unregisterClient(mCommandHandler);
  }
  

• Notification activity:

  @Override
  protected void onDestroy() {
      super.onDestroy();
      Helper.finishApp();
  }