Permanent connection via Wi-Fi and 3G in Android

Question

I have little doubt about the network connection procedure in Android.

My scenario is similar, I am connecting to a remote server via TCP using 3G. After he connected, I turned on Wi-Fi. Android switched to WiFi. And, still a live connection to the server means there is no connection.

Here I want to know one thing. When N / W switches from 3G to Wi-Fi, will the Android (or any other) device change its IP address? and if he changes his IP address, will this previous connection be valid? (This means that a new connection should appear on the new IP address again.)

Thanks in advance.

Answer 1

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• Android 3G
• Android HTTP GET -
• Android WiFi 3G

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  if(!isOnline()) {
    Log.e("OFFLINEERROR", "No Network Connectivity");
  }
  
  public boolean isOnline() {
    try {
      ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
      return cm.getActiveNetworkInfo().isConnectedOrConnecting();         
    } catch(Exception e) {
      //Returned a null so no Internet connection!
      return false;
    }
  }
  

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