Socket Networking - Set Up Basic Network Connection Using Droids?
Feb 7, 2012
I'm trying to set up a basic network connection using droids but I'm having problems.my server program:
Code:
ServerSocket ss = new ServerSocket(8888);
while(!end){
//Server is waiting for client here, if needed[code]....
the server runs until it reaches ss.accept() like it should but the client still can't connect. The client usually times out and nothing happens
I'm running both these programs using eclipse on my computer. I set the premissions in the manifest for both programs to let them use the internet and I have the port forwarding .
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Jan 22, 2010
I've been lookin @ this forum for a while now and now i decided to join! I was just wondering what apps (on rooted droids) make big difference than the stock droids? also, is there any great performance upgrade on the rooted droids?
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Jun 20, 2012
I'm making a chat program and server relay on pc and I was wondering if there's a simple template for tcp/ip socket connections.
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May 27, 2010
I'm working on application that uses a socket connection.I've implemented 2 different Threads for the read() and the write() methods so they are not being blocked by the read.Everything is working well on the WiFi connection but when I switch to GSM connection the connection becomes unstable without any exception being thrown. It means that there are freezes.the write and read seems to work but no data is actually being piped.
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Dec 7, 2009
I wondered if there could be a specific reason why a server socket could refused a client request connection , the server running on one android device the other on the emulator?
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Jun 21, 2010
I would like to know what is the recommendation for socket connection management in Android?In our App we would like to be connected to a TCP/IP server when our app is in the foreground or paused. So, create a connection to a TCP/ IP server when the App starts basically, On Create of the launcher activity. However, we do not want to create a new connection and close connection every time an activity is created, paused, destroyed or orientation changed. So, we save the connection object in the App class and the activities will reuse the same connection.Question is when do I close it? I would like to close the socket when the App is "paused", "stopped" or "destroyed". The problem is these messages are not sent in the App context. How can I figure out if the App is in foreground or not? Even the "Terminated" event for an App is not guaranteed to be delivered. So, in that case how do I know when to disconnect?
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May 24, 2010
I'm working on application that uses a socket connection. I've implemented 2 different Threads for the read() and the write() methods so they are not being blocked by the read. Everything is working well on the WiFi connection but when I switch to GSM connection the connection becomes unstable without any exception being thrown. It means that there are freezes at the write and read seems to work but no data is actually being piped.
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Nov 11, 2010
I'm creating an application that uses an android to send and receive data via bluetooth. but I'm having problems when creating the socket. He gets caught in that line mmSocket btserver.accept = (); And I can not pair with any device.I have another doubt, I can make that communication with an android and a symbian?
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Mar 3, 2010
I have been trying to setup a Droid to Droid 3G connection. I can confirm that all works great in wifi mode. The Droid can make connection requests (Http, Telnet, raw sockets) in 3G, but I cannot get the Droid to accept a socket connection in 3G mode. I was told by Verizon that a special license may be needed to accept socket connection requests and they would send me some information. So far none has been received. If anyone knows how to program the Droid to accept socket connection requests over 3G, please respond. Also if anyone knows why this not allowed please respond.
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Apr 1, 2010
I am working on an app that uses a Socket to connect to a controller over TCP. The protocol library was written in Java and I am implementing it in android via a Service. where the Connection class is a Thread that handles the communications with the controller. It's where the Socket lives.I'm using the Preferences mechanism to store the IP and Port. If I feed the Socket the correct IP and Port, the Connection Service works beautifully. However, I am trying to simulate a user entering the wrong information and having the connection fail. The ultimate goal is to present a dialog and offer the ability to "reconnect" or "update settings". However, when I enter a wrong Port number, the application simply hangs.I was under the impression that Threads executed concurrently so I've tried moving the call to start the Connection Service to a Thread, but it still hangs the application.
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Dec 22, 2011
I'd like to know whether there is a way to connect to a TCP server (socket server) in an computer using his name (e.g.: my computer has a host name: MyComputer; then I must connect with it using his name).
It can be done using NBNS protocol (NetBios Name Service), but always I try to connect using his name, the Tablet uses DNS protocol instead of NBNS, as I might expct.
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Jul 15, 2010
I am developing an app which has one service running in the background even if the application is closed. This service basically listens to the server via socket connection. It is an app's requirement to keep one consistent connection open. but this drains battery liek anything. I know socket is costly affair in the sense of battery life. Do anybody know any other way to keep communication channel open? or any optimization in using socket?
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Apr 29, 2010
First off, let me say that feel free to recommend me if long lived TCP persistent connections are the way to go or persistent HTTP connections are better.
I've also pre-read that instead of having a persistent connection, I can have a polling mechanism.
I'm just asking in the curious interest of how can I create a persistent connection from Android to a server?
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Feb 19, 2010
I assume that when I do a read on the inputstream, it blocks until it gets more data to read.
I also assume that when the connection is closed, the read throws an IOException.
The problem is that sometimes when I change the connection from carrier to WiFi or from WiFi to carrier, the read just gets stuck and never throws the IOException.
The SDK is 1.5 and the phone a HTC Hero.
This behavior is quite ugly for me because I need to stay always connected.
Does someone else have ever seen this problem ? Is it a bug or am I the bug?
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Dec 14, 2009
I am able to connect to a Socket on my PC from my HTC 1 phone, via IP and successfully transfer data in a thread that gets rescheduled every few seconds. The problem is that after 15 minutes or so, the connection drops and my debug traces give me the "Network unreachable". A further clue is that if I plug in or replug in the USB cable I get reconnected.
I'm wondering what programmatic function will reconnect to the PC without having to fiddle with the USB cable. I've tried Wifimanger.reconnect and reassociate, neither did the trick. Perhaps if I knew what actions were peformmed when the usb cable is plugged in (which shouldn't have anything to do with my connection) I would be able to program them into my exception path.
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Jul 9, 2010
I am playing around a bit with peer-to-peer communication with android devices.I have written a basic program that creates a listening ServerSocket on each phone using the application. Using the application you can also connect to other devices that is listening, by connecting to the remote ServerSocket. Nothing strange about that.My problem is that it seems that the listening port is not open for connection on different devices. I can connect to my HTC Desire, works like a charm. But connecting to a HTC Hero I get timeout, same if I try to connect to the emulator. But connection FROM the emulator to the Desire and FROM the Hero to the Desire works like a charm. Whats up with this? No security apps is installed and both devices(and the emulator) is running 2.1.
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Feb 6, 2010
I am trying to connect to server through HttpUrlConnection, but after sometimes it throws Socket.Net Exception :Network Unreachable. I tired alarm manager to wake up the phone and get the wifi lock but none seems to work .
Tell me what to do what should i check and alternative?
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Aug 3, 2010
How can I make the Device sound a beep when socket connection has been established. In other words, how to set a notification tone when an event occurs in Android sdk?
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Feb 3, 2012
So Im writing an application to communicate to a Wi-Fi enabled Arduino board with a static IP...
This is what Im trying to do...
1.) Enter Ip and Host
2.) Connect
3.) Simply send either a "0" or "1" to the arduino board
There are two activities at the moment, one to enter the IP and port of the Board (which is set from the board itself) and one to send data to the board. When i comment out the connection methods in the Communicator class the app swithches activities without any issues, but when i un-comment them and attempt to connect, the app immediately closes after i attempt to connect.
Code:
package car.test.namespace;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
[Code]...
Code:
package car.test.namespace;
import java.io.*;
import java.net.*;
public class Communication {
[Code]...
Code:
package car.test.namespace;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
[Code]..
Also, im not even seeing the "Connection Failed" message, the app is just shutting down,.
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Mar 6, 2009
I have been looking at the ConnectivityManager class documented at http://developer.android.com/reference/android/net/ConnectivityManage... .
I would like to know if an Android application can open a network connection (socket) on a specified network interface [on a device supporting multiple network interface types WiFi, Cellular, WiMax etc] ? I am looking for the capability for an application to open a socket on a given type of network for example over WiFi network or over 3G Cellular Data network.
If this is possible in Android, how would I code this requirement within the API Framework ? The ConnectivityManager enables an application to learn about available network connections and currently categorises them as either TYPE_WIFI or TYPE_MOBILE.
There is a member function in the ConnectivityManager class called requestRouteToHost(int,int) [url] which "Ensure that a network route exists to deliver traffic to the specified host via the specified network interface. An attempt to add a route that already exists is ignored, but treated as successful." Sounds like this would install an IP routing table entry to reach a given host via a specified network interface type (WiFi or Mobile). After calling this would it be sufficient for an application to open a socket and connect to the desired destination address ?
Or perhaps the application needs to bind() a socket to a local address of a network interface of the desired type (WiFi or Mobile) Or by setting a socket-level socket option of SO_DONTROUTE ?
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Dec 16, 2009
Does Android keep the connection between the server/socket when it moves from EDGE to WIFI and vice versa?
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Jun 29, 2010
We have a simple client server architecture between our mobile device and our server both written in Java. An extremely simple ServerSocket and Socket implementation. However one problem is that when the client terminates abruptly (without closing the socket properly) the server does not know that it is disconnected. Furthermore, the server can continue to write to this socket without getting any exceptions. Why? According to documentation Java sockets should throw exceptions if you try to write to a socket that is not reachable on the other end!
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Nov 12, 2009
Essentially Im trying to get many many java clients connect to a socket on my ColdFusion server (Using the Socket Gateway). However before i even start to code this, Im a little confused about sockets and their performance. First of all, are sockets meant for many(1000+) clients connecting to one socket (say port 2202) on one server? How is the performance if all there waiting for is basically a ping, or something such that when these clients receive this "ping" they can go get some new data.
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Mar 11, 2010
I am trying to open a Socket on Android but everytime I try I keep getting connection refused error no matter what way I try.The error happens on the following line of code where I try to create the connection.
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Oct 7, 2010
I am facing problem to establish a socket connection from android device to PC's a specific port like 8080. I just want to create a socket which will connect to the specific port and also write some data stream on that port.I have written some code for this purpose.
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May 11, 2010
I am having this error since last two weeks "Your SIM does not allow connection to this network." I have tried everything to the best of my knowledge:
- Reset Phone (Soft & Factory Settings both)
- Rooted Phone
- AnyCut application to reset Radio
- Updated radio to 63.18.55.06JU_6.35.09.26-signed
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Sep 24, 2011
I want to check that the network connection is alive on the phone from program but when i try to run this code
Code:
private boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
if (netInfo != null && netInfo.isConnectedOrConnecting()) {
return true;
}
return false;
}
I get the message "Sorry 'Appname' is stopped unexpectedly. Try again".I might have to search the solution elsewhere, i added permissions for network, run the application and got the same error but when i tried to start it from the menu it said application not installed.
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Jun 8, 2010
I'm guessing this will be such a newbee question but I hit a wall and I am running the WebSocket.Now, when I start the server and run the Weberknecht client like a normal Java application I get a connection. Granted, the connection is quickly dropped because the handshake needs to be configured but at least the server shows me a connection was attempted.
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Nov 15, 2010
Recently I've started facing a problem on my Desire. Sometimes it acts like the network is down, and the signal bar shows a cross. At that time when I tried another sim card, the network was working fine. Then after a while my phone starts showing network with the original sim. But it won't connect to the internet. It simply won't connect, although I am toggling the mobile data connection tick mark.
Right now the network has gone again, and I'm trying to get connected to it through either Automatic registration or manually selecting from the list of network providers. But I get the message "unable to connect to this network at this time"...
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Jun 10, 2010
I am developing an Android application and I would like to setup a tcp/ip type of connection between two Android phones using the 3G/Edge network. My test version will establish a connection if I have both phones on a lan using wifi but when I use T-Mobile's network a connection is not established. Could this issue be a port or ip address?
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