Can anyone tell me which port is used for udp connection in android?
And how to open sockect for it?
DatagramSocket socket = new DatagramSocket();
socket.setSoTimeout (0);
socket.setSendBufferSize (16384);
socket.setReceiveBufferSize(16384);
socket.connect(address);
is one way of doing it. The socket.setXXX stuff is (obviously) optional.
As far as I remember ports below 1024 are reserved for privileged processes (could be wrong about that though).
Related
I've read the discussion, and now I am working on my own simple Android firewall. Here is the algorithm they used.
The discussion
I was able to forward packets. If I remember correctly I just needed to read the TCP header and open another socket to that destination and send it headerless.
So now I need to write data to my Wi-Fi or 3G network interface if I understand them correctly. How to do that?
I solved it. I only needed to protect the socket which I'd like to use to send data directly to the server without using the TUN device.
Socket socket = socket = SocketChannel.open().socket();
if (!protect(socket)) {
Log.e(Constants.TAG, "Failed to protect the socket");
}
The documentation
i'm developing a small example about socket connection between android and ios (via wifi), after trying, the connection hasn't been established. Here is what I have done so far, I created a server on ios (used Bonjour to publish the service). I also created a client on android. However, after starting the server on ios, I also got the log:
ServerSocketConnection[3487:c07] Bonjour Service Published: domain(local.) type(_serversocket._tcp.) name(Macmini) port(54065)
Which means the server starting ok.
To the client part(android), I created the client through Socket class, some few lines of code:
Socket s = new Socket("local.", 54065);
OutputStream out = s.getOutputStream();
PrintWriter output = new PrintWriter(out);
output.println("Hello Android!");
BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
String st = input.readLine();
Putting it into AsyncTask to execute. However, I got the UnknowHostException:
08-06 12:45:44.460: W/System.err(873): java.net.UnknownHostException: Unable to resolve host "local.": No address associated with hostname
I'm a newbie to this kind of problem so any ideas what the problem is? I know it's related to the "host" thing but need the way to fix it.
*Note: I run 2 apps on 2 simulators (ios and android) as the same wifi network and same MAC, maybe this is the problem? any help would be appreciated and sorry for my English, it's not my native one.
Use the actual IP address of the iPhone instead of 'local.'.
On Android you can find a phone's IP via Settings -> WiFi -> Advanced. Not sure if iPhone offers the same option.
ps. Also be sure to have the internet permission in your manifest;
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
I am new to android and is trying to develop an application. I have a local server that has the address like http://abc:9070/
i.e: the server is running only on port number 9070 in my laptop.
Now i want to debug my program using a android device and i have to make sure that the android device listens to port number 9070, So that i can make the post http request call to the url and fetch some information.
Can someone tell me how can i make my device to listen to port number 9070?
Also can someone tell me whether changing default port number of adb solve this.
I have tried a lot to search for a solution. But i am not able to come up with any good answers.
Thanks in advance.
Nobody has expressed an opinion yet. May be the question is not clear, at least I found it very difficult to understand what you are trying to do.
You say you have a server (laptop) listening on port 9070 and you want a device to connect to this server thru this port? Is that right?
Have you try, from your device, launch the navigator and connect to that address? http://abc:9070
Anyway, the java code to make a socket connection is something similar to this:
try
{
Socket clientSocket = new Socket("YOUR_LAPTOP_IP", 9070);
// 1024 is an arbitrary number, could be 512, 65535, etc
byte[] buffer = new byte[1024];
int ret=0;
while ((ret=clientSocket.getInputStream().read(buffer)) > 0)
{
// from now on it's up to you what to do with the data you read
}
clientSocket.close();
}
catch (Exception e)
{
e.printStackTrace();
}
So im working around with bluetooth and trying to figure out how to send two strings via a bluetooth connection. From one android device to another.
I found this guide http://developer.android.com/guide/topics/connectivity/bluetooth.html
but it talks alot about setting up the connection. So i went straight down to the chapter about Managing a Connection. The reason i do this is that in the apps i create i plan to setup the bluetooth connection before opening the apps (via the phones usual bluetooth setup) and then open the apps and send when it is necessary.
So my question is how do i find the bluetooth socket that should be setup? Since that should be what im searching for to create the sending and recieving threads?
Hope this is enough information, else tell what more you need and ill try and answer to the best of my ability.
Best Regards Drakthal
The usual bluetooth setup only pairs between devices, it doesn't create a data connection between them (And even if it would, you wouldn't be able to access this Socket object because it's not created in your process).
After Bluetooth is turned on, you can call BluetoothAdapter.getBondedDevices() to get a set of the paired devices. You can then iterate over them, and initiate a connection to the one you want. You can't avoid the connection creation :( If you want a simplified example, you can look here (An answer I posted a while ago, regarding the whole pairing/connecting/sending/receiving subject with bluetooth).
Once you acquired an open connection, sending the 2 string is easy.
String s1 = "A", s2 = "B";
byte[] buf1 = s1.getBytes(), buf2 = s2.getBytes();
OutputStream os = connection.getOutputStream();
os.write(buf1);
os.write(buf2);
os.flush();
connection.close();
what is the best approach of connecting android to server and ip and corresponding port? THis connection doesn't need to be all the time, but I am assuming I will send and recive files (in byte arrays or streams).
Thanks
Since the Android Development Tools are native to Java, you can use simple Java Socket APIs to accomplish this goal (see ServerSocket and Socket).
Server Code
You must start by opening a ServerSocket on your host computer by defining a port to listen on:
ServerSocket ss = new ServerSocket([some_port]);
Then you must begin listening for a client by calling ss.accept(). This method will block until a client connects:
Socket my_socket = ss.accept();
You now have a socket on your server that you can manipulate as you wish (probably through the use of ObjectInputStream and ObjectOutputStream):
ObjectOutputStream out = new ObjectOutputStream(my_socket.getOutputStream());
ObjectInputStream in= new ObjectInputStream(my_socket.getInputStream());
Client Code
You must establish a connection with the server that you have just created. You will do this by initializing a socket and passing in the IP address of your server (usually localhost for most testing purposes) and the port number on which your server is currently listening:
Socket socket = new Socket("localhost", [some_port]);
Again, establish some streams for communication:
ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
And there you have it! You can now easily communicate with a server from an Android device. It is much simpler than you would think.
Please note, however, that this architecture implements TCP, which is much slower than UDP and will not work for any type of fast-paced data intensive games, but should accomplish your goals given your description above.