Connection to an existing session

Since Android SDK build 1.1.0.55, it is possible to connect to an existing websocket session on the server to accept an incoming call when push notification is received:

1. Set keepAlive option when conection is established for the first time
   

   Connection connection = new Connection();
   connection.setSipLogin(mSipLoginView.getText().toString());
   connection.setSipPassword(mSipPasswordView.getText().toString());
   ...
   connection.setKeepAlive(true);
   session.connect(connection);
   

2. Keep a session token after successful connection
   

   @Override
   public void onConnected(final Connection connection) {
       runOnUiThread(new Runnable() {
           @Override
           public void run() {
               ...
               String token = connection.getAuthToken();
               if (token != null && !token.isEmpty()) {
                   mAuthTokenView.setText(token);
                   mConnectTokenButton.setEnabled(true);
               }
           }
       });
   }
   

   Then, the session can be disconnected on mobile device when application goes to background, but the session will be kept on server during 1 hour by default.

3. When push notification is received, connect to the existing session by token
   

   createSession();
   Connection connection = new Connection();
   connection.setAuthToken(authToken);
   connection.setKeepAlive(true);
   session.connect(connection);
   

4. Receive incoming call event and create answer/hangup alert dialog
   

   @Override
   public void onCall(final Call call) {
       call.on(callStatusEvent);
       /**
         * Display UI alert for the new incoming call
         */
       runOnUiThread(new Runnable() {
           @Override
           public void run() {
               AlertDialog.Builder builder = new AlertDialog.Builder(PhoneMinActivity.this);
   
               builder.setTitle("Incoming call");
   
               builder.setMessage("Incoming call from '" + call.getCaller() + "'");
               builder.setPositiveButton("Answer", new DialogInterface.OnClickListener() {
                   @Override
                   public void onClick(DialogInterface dialogInterface, int i) {
                       PhoneMinActivity.this.call = call;
                       ActivityCompat.requestPermissions(PhoneMinActivity.this,
                             new String[]{Manifest.permission.RECORD_AUDIO},
                             INCOMING_CALL_REQUEST_CODE);
                   }
               });
               builder.setNegativeButton("Hangup", new DialogInterface.OnClickListener() {
                   @Override
                   public void onClick(DialogInterface dialogInterface, int i) {
                       call.hangup();
                       incomingCallAlert = null;
                   }
               });
               incomingCallAlert = builder.show();
           }
       });
   }
   

5. Accept the incoming call
   

   case INCOMING_CALL_REQUEST_CODE: {
       if (grantResults.length == 0 ||
              grantResults[0] != PackageManager.PERMISSION_GRANTED) {
           call.hangup();
           incomingCallAlert = null;
           Log.i(TAG, "Permission has been denied by user");
       } else {
           mCallButton.setText(R.string.action_hangup);
           mCallButton.setTag(R.string.action_hangup);
           mCallButton.setEnabled(true);
           mCallStatus.setText(call.getStatus());
           call.answer();
           incomingCallAlert = null;
           Log.i(TAG, "Permission has been granted by user");
       }
   }