Hi all
I want to program a server on android phone. I use socket.
Is the android emulator's IP address the same to the PC's?
I got exceptions from the client which I program on the same PC.
the exceptions is:
java.net.ConnectException: Connection refused: connect
java.lang.NullPointerException
the code is below:
java client:
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
public class JavaClient {
public static void main(String argv[])
{
Socket ClientSocket = null;
DataOutputStream os= null;
DataInputStream is = null;
try {
// Retrieve the ServerName
InetAddress serverAddr = InetAddress.getByName(SERVERIP);
/* Create new UDP-Socket */
ClientSocket = new Socket(serverAddr,SERVERPORT);
os= new DataOutputStream(ClientSocket.getOutputStream());
is = new DataInputStream(ClientSocket.getInputStream());
} catch (UnknownHostException e) {
System.err.println("Don't know about host: hostname");
} catch (IOException e) {
System.err.println(e);
}
try {
os.writeBytes("hello");
byte[] input = new byte[100];
while(is.read(input, 0, 10)!=-1)
{
System.out.println(new String(input));
}
os.close();
is.close();
ClientSocket.close();
} catch (Exception e) {
System.out.println(e);
}
}
public static final String SERVERIP = "142.19.128.114"; //
'Within' the emulator!
public static final int SERVERPORT = 4444;
}
android server:
public class AndroidServer extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DataOutputStream os=null;
DataInputStream is = null;
ServerSocket socket = null;
Socket ClientSocket = null;
try {
/* Create new UDP-Socket */
socket = new ServerSocket(SERVERPORT);
ClientSocket = socket.accept();
os = new DataOutputStream(ClientSocket.getOutputStream());
is = new DataInputStream(ClientSocket.getInputStream());
/* By magic we know, how much data will be waiting for us
*/
byte[] buf = new byte[100];
while(is.read(buf, 0, 10)!=0)
{
Log.d("TCP", new String(buf));
os.writeBytes("end");
}
os.close();
is.close();
socket.close();
ClientSocket.close();
} catch (Exception e) {
System.out.println(e);
}
}
public static final int SERVERPORT = 4444;
}
Regards,
Lei
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