Android :: Server Socket Programming In 1.5 / Most Power Efficient Way?
Dec 2, 2009
I am doing a project where I have too develop an application that listens for incoming events by a service. The device that has to listen too events is an Android phone with Android SDK 1.5 on it. Currently the services that call events only implement communication trough UDP or TCP sockets. I can solve my problem by setting up a ServerSocket, but i doubt that's the most power efficient way. This application will be running most of the time, with Wi-Fi on, and I'd like too reach an long battery duration. I've been looking for options on the internet for my question for a while but i couldn't get a real answer.What is the most efficient way too listen to incoming events? Should I make an ServerSocket? or what are my options?Are there any other implementations that are more power efficient?
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Mar 14, 2014
I have recently developed android application using server socket programming My problem is this its running show slow.
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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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May 8, 2010
I've recently knocked up a server/client app for Windows & Android that allows one to send a file from Windows to an android phone over a socket connection. It works great for a single file but trying to send multiple files over in a single stream is causing me problems. I've also realised that aside from the binary data, I will need to send messages over the socket to indicate error states and other application messages. I have little experience with network programming and and wondering what is the best way forward.Basically the C# server side of the app just goes into a listening state and uses Socket.SendFile to transmit the file. On Android I use the standard Java Socket.getInputStream() to receive the file. That works great for a single file transfer, but how should I handle multiple files and error/messaging information? Do I need to use a different socket for each file? Should I be using a higher level framework to handle this or can I send everything over the single socket? Any other suggestions for frameworks or learning materials?
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Jul 15, 2010
I am writing an Android app that should exchange data to a server over Bluetooth, with the server side on a PC running Ubuntu, using the bluez library, in C (or C++).
My Android app fails (IOException) when I try to connect to my server socket on the PC.
Here is essentially what I in the java code (in Android, full eclipse project here: http://dl.dropbox.com/u/2968234/ThinBTClient.zip)
CODE:...........
This throws IOException after a timeout of 10seconds or so.
On the server side (in Ubuntu 8.10), I basically set up a Bluetooth server socket, along the lines described in the example bluez/sdp-register.c
Down below is my C++ program. To compile it do
g++ -I/usr/include/glib-2.0/ -I/usr/lib/glib-2.0/include -o bt_server bt_server.cpp -lbluetooth
I can do the reverse succesfully, i.e. create a server socket in Android and connect from Linux, however this is not what I want to do!
I think either the problem has to do with my config of Ubuntu.
CODE:................
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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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Jun 25, 2010
I'm now facing a very strange server socket problem, I have a server that will listen on a TCP port, I use the following code to do this work. public class RequestListenerThread extends Thread.
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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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May 19, 2010
I am attempting to open a ServerSocket on my Android device to receive network connections, but do not seem to recieve network traffic from them. Running netstat -an on the device shows it is listening on 0.0.0.0:1234, but my connections to telnet to <public ip of Android device>:1234 do not appear (and do not receive a SYN,ACK in response). How can I write an application which will open an accessible server socket? Is this possible? I am thinking that either the ISP (mobile carrier) may be blocking this incoming connection attempts or the Android OS is blocking them (host firewall)?
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May 2, 2010
Why cant Google with all its programming knowledge and power make some QUALITY apps for us?
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Aug 6, 2010
So I have an android application that needs to connect to a socket server. That's simple enough if the socket server was running on my development machine. However the socket server is running on a server not only not on my own machine, but on a different subnet. How would I connect my emulator to the socket server? I understand how the port forwarding works to connect to the local machine, but I'm sort of confused on how I can redirect it across a subnet from my dev machine.
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Mar 3, 2010
I have a simple client-server app on android. the android service communicates with the server via tcp sockets. the service sends a simple String to server which works. the server processes the string and sends back an object to the android service. the object implements the serializable interface. the object "leaves" the server successfully but at the point where the android service receives the object (socket.readObject()
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Oct 31, 2010
I'm working on an Android app that requires both client and server certificate authentication. I have an SSLClient class that I created that works beautifully on regular desktop Java SE 6. I've moved it into my Android project and I'm getting the following error: "KeyStore JKS implementation not found".I've looked online a bit and it looks like there's a possibility that Java Keystores are not supported on Android (awesome!) but I have a feeling there's more to it than that because none of the sample code I've found resembles what I'm trying to do at all. Everything I found talks about using an http client rather than raw SSL sockets. I need SSL sockets for this application.
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Jul 18, 2009
I was developing an app which need to open serversocket.
But, when i open one on poet 80, this throw a BindException :/ iven with the INTERNET permission. Open on other port work (ex: 8080).
Does this mean android not allow me to use this socket?
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Mar 17, 2010
I noticed that if the Android phone is listening on a ServerSocket on the 3G network, and is then put to sleep with the power button, it no longer listens for incoming connections. The incoming TCP connection does not wake up the phone. Is this there a way to enable waking up a sleeping phone on incoming Server Socket connections, the way that incoming data on a regular Socket does?
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Oct 27, 2010
I am trying to setup at ServerSocket on my Android phone, and send a char or int or anything from my computer. The code on the phone creates a ServerSocket and then blocks whilst waiting for a connection(plus some more bits if the socket is created. But I'm not getting this point, so left that out!)Basically, the phone is getting to accept, and the computer is not connecting. The xx.xx.xx.xx is the public IP of the phone I obtain programatically (and it matches up with checking on whatismyip.com).I have set the INTERNET permission on the phone. I have also been able to do this in reverse (ServerSocket on pc, client on phone).
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Nov 2, 2010
i am trying to get an android app to send tcp data to a server on my network. The server was written in c#. When i use the code below to transmit data, the server only receives a whole series of.
Socket socket = new Socket(host, port);
PrintWriter pw = new PrintWriter(socket.getOutputStream(), true);
pw.print("test");
socket.close();
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Aug 31, 2010
I have recently written a socket server in PHP that will be handling communication between an Android phone application and my PHP webserver. Due to the fact that Android doesn't natively support push style notifications we are going to be using our webserver as the middleware layer to handle our 'pushes'. The socket server is stable, runs well, and seems to scale nicely. While I would eventually like to re-write this in C I don't have the skill necessary to do that right now so I am going to be staying in PHP for at least a short while. As of this moment our Android emulator is able to communicate through the server, get pushes, etc. so that part is all covered.
My concern is that, right now, anyone can open a socket to my server and will be given a client connection. While we won't be passing sensitive data back and forth I don't want to allow just anyone to connect over and receive broadcast information, eat up my resources, and clog my server in general. The question is, how do I secure a server like this? Let's assume that I am running on port 25,000--can I set up some sort of SSL layer on that port and expect devices like the Android to be able to communicate over that port without any special protocols or jumping through hoops? I have considered asking the connecting clients to authenticate their user against our user database before being given a client connection, but that would require the passing of credentials in plain text over the network which I am not about to do.
I am rather new to straight TCP communication from PHP and feel like I might just be missing something simple that allows for authentication on this level.
Additional information: If I am able to get a valid username and password securely I would be using MySQL to validate the user and then accept/reject their connection based on the results of the query.
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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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Oct 20, 2010
Hi, i am very new to programming in java however have a lot of experience in .NET (c# & vb.net). I am trying to create a new instance of a serversocket class in eclipse IDE and when i type the following code it is giving me an "Unhandled exception type IOException" and i havent even tried to run the code yet! I dont understand how my code is exceptioning before runtime or what i can do to fix it.
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Apr 7, 2010
I want to make my phone communicate with computer with socket. I have try many kinds of source in internet. None of them works. The phone always display "HelloWorld <ActivityName>". Log.d() seems not work on my phone, because, I have used that, but nothing was printed.
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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 6, 2009
I wrote one application using socket, which connectes to one server. for some reasone, the server may Disconnect the connection, I noticed that once the connection is disconnected, android GC starts to work, and the emulator is freeze, after a while, my application got IOException, then GC stop to work, who know why?
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Dec 24, 2009
I have made apps for the iPhone, but want to also code for the Android but want to know if it is first worth my time, second worth my having to learn another language, and third worth the effort in the sense that am I going to make a profit from this. Also if in any way Android code is similar, then will it be hard to bring the iPhone (Xcode) files, or copy and paste my iPhone code into the Android code.
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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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Oct 27, 2010
In my android application i am trying to run a application using GPRS connection and not WIFI.When tried to run in wifi the app runs fine.The browser works fine with the APN settings set but when trying to connect to server using my application it gives me socket exception.I am using the below permissions in manifest file.
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses- permission>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
<uses-permission android:name= "android.permission.CHANGE_NETWORK_STATE"></uses-permission>
<uses-permission android:name= "android.permission.WRITE_APN_SETTINGS" ></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" ></uses-permission>
I am receiving Socket not connected exception.Is there any other permission which i need to add for using GPRS connection other than WIFI.
10-27 18:26:19.689: WARN/CalSyncSvc(166): com.motorola.blur.service.email.protocol.activesync.ASException: Problem executing HTTP POST
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.service.email.protocol.activesync.ActiveSyncMgr.sendRequest(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.service.email.protocol.activesync.ActiveSyncMgr.sendXMLCommandNoProvisoning(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.service.email.protocol.activesync.ActiveSyncMgr.sendXMLCommand0(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.service.email.protocol.activesync.ActiveSyncMgr.sendXMLCommand(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.service.email.protocol.activesync.ActiveSyncMgr.sendFolderSyncCommand(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.service.email.protocol.activesync.ProviderAPI.sendFolderSync(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.service.email.protocol.activesync.ProviderAPI.updateMapFromFolderSync(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.service.email.protocol.activesync.ProviderAPI.updateFromFolderSync(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.calendar.sync.activesync.SyncService.syncAccount(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.calendar.sync.activesync.SyncService$QueueEntry.run(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:416)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:256)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.FutureTask.run(FutureTask.java:122)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:648)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:673)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.lang.Thread.run(Thread.java:1058)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.util.concurrent.BlurThreadFactory$BlurPooledThread.run(Unknown Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): Caused by: java.net.SocketTimeoutException: Socket is not connected
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.harmony.luni.platform.OSNetworkSystem.connectStreamWithTimeoutSocketImpl(Native Method)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.harmony.luni.platform.OSNetworkSystem.connectStreamWithTimeoutSocket(OSNetworkSystem.java:140)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:229)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:521)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.net.Socket.connect(Socket.java:1019)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.conn.ssl.SSLSocketFactory.connectSocket(SSLSocketFactory.java:317)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:129)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:348)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
10-27 18:26:19.689: WARN/CalSyncSvc(166): ... 17 more
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Nov 2, 2009
In my app I am drawing bus routes on top of a MapView. The routes have anywhere between a dozen and a few hundred GPS coordinates that describe the route that the bus takes. The problem I'm having is that once I draw out all these lines panning/zooming the MapView is incredibly slow (even clicking the 'Back' button takes a minute to happen). I'm not sure how relevant it is, but I put in some debug code then checked the logcat output and the MapView is repeatedly calling the draw() method of the Overlay whether anything has changed or not. This is happening several times a second and is causing a massive amount of garbage collection to happen (2-3 MB every second).
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Jun 21, 2010
Is there any efficient linear algebra library for android? I need to compute matrices of different sizes(also bigger than 4x4) and rectangular too.
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Nov 24, 2010
I want to do the following and am kind of stuck on these for a few days:
1) I was trying to draw poly lines ( I have encoded polylines, but have managed to decoded those) that move when I move the map(the only solution that I found was for Geopoints to be transformed into screen co-ordinateswhich wont move if I move the map !)
2) I have used helloItemizedOverlay to add about 150 markers and it gets very very slow.any idea what to do ? I was thinking about threads(handler)
3) I was looking for some sort of a timer function that executes a given function, say, every 1 minute or so.
4) I was also looking for ways to clear the Google map from all the markers/lines etc
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Aug 3, 2010
My application requires that when a snapshot is taken it must store in memory and next time when I restart the phone I must get a thumbnail of that photo in list of photos and the full scale photo when I click on it.There are 2 ways I know.
1. Store images directly. Concern here is every time it has to hit directory to get image which takes some time.
2. Store all images in single xml. Concern here is XML will be too big and takes time to parse.
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