Android : Socket Creation Failure

Feb 3, 2010

I created a simple client socket from my Activity, but it fails. I am running this activity in emulator and server runs on PC(its a different application without Android stuff).

*clientSock = new Socket("", 30001);*

logcat shows permission denied <maybe missing INTERNET permission>

If I enable permission for my Activity(android.permission.INTERNET), my Activity constructor itself not called and logcat shows following info. Permission Denial: starting Intent < flg=0x10000000 cmp=com.example.client/.MyClientActivity > from null <pid=-1, uid=-1> requires android.permission.INTERNET.

Any suggestion on how to resolve this issue?

Android : Socket creation failure


Android :: Detecting Socket Connection Failure

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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Android :: Java Socket Not Throwing Exceptions On Dead Socket?

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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Android :: Socket Programming - Java - Many Clients One Socket

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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Android :: Connecting Android Bluetooth Client Socket To Ubuntu Server Socket

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:


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.


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Android :: Socket Exception Socket Not Connected Android

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): Problem executing HTTP POST

10-27 18:26:19.689: WARN/CalSyncSvc(166): at Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at 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$ Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.Executors$
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.FutureTask$Sync.innerRun(
10-27 18:26:19.689: WARN/CalSyncSvc(166): at
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
10-27 18:26:19.689: WARN/CalSyncSvc(166): at java.util.concurrent.ThreadPoolExecutor$
10-27 18:26:19.689: WARN/CalSyncSvc(166): at
10-27 18:26:19.689: WARN/CalSyncSvc(166): at com.motorola.blur.util.concurrent.BlurThreadFactory$ Source)
10-27 18:26:19.689: WARN/CalSyncSvc(166): Caused by: 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(
10-27 18:26:19.689: WARN/CalSyncSvc(166): at
10-27 18:26:19.689: WARN/CalSyncSvc(166): at
10-27 18:26:19.689: WARN/CalSyncSvc(166): at
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.conn.ssl.SSLSocketFactory.connectSocket(
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(
10-27 18:26:19.689: WARN/CalSyncSvc(166): at
10-27 18:26:19.689: WARN/CalSyncSvc(166): at
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.client.DefaultRequestDirector.execute(
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.client.AbstractHttpClient.execute(
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.client.AbstractHttpClient.execute(
10-27 18:26:19.689: WARN/CalSyncSvc(166): at org.apache.http.impl.client.AbstractHttpClient.execute(
10-27 18:26:19.689: WARN/CalSyncSvc(166): ... 17 more

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Jun 3, 2010

I have an Android application with a main activity that is the tabhost. I'm adding multiple tabs to the tabhost with an intent to several activities.

My problem is that these activities are not created (onCreate is not called) until I click on the tab. This is a problem because I need to register broadcastreceivers: there may be broadcasts that are sent -before- a particular tab is opened.

I tried to work around this by:

Setting my receivers as static and registering from somewhere else. This is not possible because I need to call into methods.

Calling into tabHost.setCurrentTabByTag(the_tag) and then switching back to my root tab. This only works sometimes and this is a very ugly solution imo.

Not using activities but just using views instead. Also not a very elegant solution because it turns my tabHost activity into one huge master class doing all kinds of unrelated things.

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May 10, 2010

A question that might be a bit general/basic knowledge, but for me it has a quite direct background, so i'll form it as an example:

I have an activity "entry" showing something equivalent of a blogpost, that might have comments. You can click somewhere to open a "comments" activity. But in this activity there are links back to entries, creating a nice line of activities.

If I call the "entry" activity (with an intent) on a link to show this entry, am I re-using the old activity, or am I creating an endless string of entry, comment, entry, comment activities (pretty cost- ineffective that would be).

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Nov 1, 2009

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May 14, 2010

I have a TabActivity. Within this activity (in the onCreate method) I create a TabHost and a TabSpec and do a tabSpectSearch.setContent(intenSearch); The Indent is created using intentSearch = new Intent().setClass(this, MyActivity.class);

As far as I already found out the class MyActivity is instantiated when I select the tab, to which it is connected. Is there a way from my TabActivity to force the creation of all activities (all tabs) at once?

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Apr 28, 2010

I use the following code to create a folder "mymir" and a file ".nomedia" (in the mymir-folder) on the sdcard of an android unit. However, somehow it fails with the exception that the folder the ".nomedia"-file is to be placed in dosn't exist.

Here's the code:


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Nov 17, 2010

I'm looking for apps which allow me to make music. Preferably something which does not just make crappy loops. Something with a staff or matrix would be nice.

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Feb 12, 2010

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Nov 25, 2009

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I have Musical, Synthesizer and Rock Out. They are ok apps for free. I'd pay for NESynth though.

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Android :: StartActivity -ForResult - At The Creation Of Main Activity

Mar 31, 2010

I would like to display a an access dialog activity at the start of my application.

In other words, I would like to start another activity (in dialog theme) as soon as my Main Activity is loaded. But, I know that I can not start an activity while another is creating.

I tried to start this activity in the onResume() method : I can see the new activity called, but the Main activity do not respond after closing the new activity.

Is there a solution to do this, without using delayed intent ? May i use a special flag for my intent ? I did not find, in the activity cycle, a way to detect the end of activity loading.

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Mar 22, 2010

How do most of you wise developers create a YouTube video for your Android Apps, if at all.?

Do you:

Hire some teenagers to do something creative and viral? Use a tool to capture the screen as a video and then add caption and voiceover later? Set up a home camcorder on a mini tripod, aimed at your Android handset on the table top? Don't bother with the video since it's too much trouble?

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Android :: Move To A Certain Position In A ListView Upon Creation In Droid?

Apr 21, 2010

I was wondering if it is possible to start a ListActivity and in real time decide how far down the list it should be focused on. (Example: When the activity is started it checks for certain conditions and then it may scroll down to a row partially through the list.)

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Android :: Small Application Creation Jobs For Droid?

Sep 27, 2010

As the title says, where can i find small application creation jobs for Android.

Please don't tell me 'freelancer' because I have already checked there.

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Feb 8, 2010

Is there a simple way to change the contents of a dialog box in Android without having to re-create the dialog box? I know that Activity.onCreateDialog() is only called once when the dialog first needs to be created, and this is where you initially set the dialog's contents. I need to change the dialog's contents later, so I'm wondering what is the proper way to do this.

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Sep 22, 2009

I'm a programmer looking to play in the mobile world. The application I'd like to play with would support my musical hobbies. I suspect a mobile phone with a music player could easily be programmed to support a classical musicians practice sessions. Access to media player APIs without the need to open external apps or do clunky things with files.Adequate access to playback API to create specific notes and beat patterns. As a hobby application, this should not require expensive tooling.I can switch to a new phone to use the application. Bonus points for something that easily ports to a netbook.I will admit I new to the world of sexy phones. I currently use an obsolete voice device with text messaging. I won't revealing my current flavor of programming because learning a new platform is just fine.

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May 11, 2010

I have an activity (called Sender) with the most basic UI, only a button that sends a message when clicked.This works ok, the message is sent but every time a message is sent a new instance of Sender is started on top of the other. If I call sendSMS method three times, three new instances are started. I'm quite new to android so I need some help with this, I only want the same Sender to be on all the time

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Apr 4, 2010

When I add this code to my Android 2.1 Java app, it fails:


Do I need a special permission to create a database, or can anybody provide a suggestion how to find out what goes wrong?

Here is the LogCat output:


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Jan 31, 2010

Say my app has a widget and I use a configuration screen to do initial app widget setup and set a few preferences.

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Can I use the same activity as the configuration activity? Will I have to handle it differently? How does the existing widget get updated with the new settings?

How can I get this to work?

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Oct 14, 2009

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Can I launch an installed android application at runtime from another android application? Whats the way for doing this?

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Feb 16, 2010

I added an intent filter to one of my activities, so that when a user clicks a URL like "", and if my app is installed, my registered activity can be launched. It works well.

I see that this creates a new instance of my registered activity though, every time a link is clicked. Is there any way to prevent multiple instances from being created - just recycle an existing instance if one already exists?

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May 10, 2013

I have a Feiteng H7189 with MTK 6589 and Android 4.2.1.

I have rooted it.

I have taken the scatter file with MTKDroid.

I have taken the Recovery.IMG with ADB.

I want to compite a new recovery with CWM or TWRP.

I have tried but all the file I create do not work.

If I put again the original recovery.img all fine.

here the scatter and the recovery original:


Here some info to compile:

shell@android:/ $ cat /proc/cpuinfo
cat /proc/cpuinfo
Processor : ARMv7 Processor rev 2 (v7l)
processor : 0
BogoMIPS : 2439.94

Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpv4 idiva idivt
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xc07
CPU revision : 2


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Feb 18, 2013

My mum won this GT-P7320T branded to telstra ( Australia) and overall, the hardware specs werent too bad, but before the ics update came out finally in january it was terribe to use.

The update has actually been a massive improvement, but being branded and all that junk is as annoying as hell, so i have decided to build my own rom. this is my first time building a rom. ive flashed plenty, but its a different kettle of fish.

i am using the telstra branded stock ics rom with rom kitchen to try to build something acceptable, but first things first, the compiled rom must boot. because the device isnt supported i have to create i file in the /directory_to_kitchen/tools/edify_defs named GT-P7320T defining all the mount points.

this is where it gets tricky, here is the contents of the /directory_to_kitchen/tools/edify_defs named GT-P7320T that i have created

# The values below should be set in each file in this folder.
# Each file represents a device name (set in ro.product.device of


as you can see, i have copied and pasted the contets of my recovery.fstab and commented it out as a reference. this should be quite straight foward, but the mount points for data and sdcard hve additional parameters, which i dont know what to do with.

the parameters are currently commented out and i cannot get it to flash i've tried lots of different combinations but to no avail.

During flashing attempts it is giving me error 7, which to me seems to indicate a problem with setting the mount points.

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Sep 7, 2013

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May 3, 2010

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testAnimation fail junit.framework.AssertionFailedError: unexpected timeout at

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