Game :: Android Java.net.Unknown Host Exception

Jul 20, 2010

I have android code that uses a background process to routinely (e.g. hourly) connect to a content source on the web to check for updated content. As new users download the app and run it for the first time, it seems (and this is just a "seems at the moment) that in this first-run situation, because the DNS for our servers are not cached already on the device, those first series of connections fail with dreaded UnknownHostException: Host is unresolved. And of course, the application tries again later and (again, "it seems like") it is all working -- perhaps because the OS has had time to actually resolve the address. So, my question(s) are: (1) Do other Android developers see this behavior with their deployed applications as well? First time, a series of "host unresolved" issues that work themselves out later. (2) Does anyone have a better strategy for "warming up the DNS" so-to-speak so that the first real connections work? or perhaps do you just re-try with some back-off looping when you encounter this exception? I was contemplating having a separate thread that tries to fetch a small text file from our server and have it just loop until it gets it and maybe (not sure about this part) block the other outgoing network connections until it succeeds.

Game :: Android java.net.Unknown Host Exception


Android :: Unknown Host Exception To GAE?

Aug 23, 2010

I am trying to post from android to GAE, I am getting unknown host exception.

Here is my code:

CODE:.......

When I am trying to connect to localhost:8888 am getting connection refused. I donno how to go pass thru this.

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Android :: TC Failure Due To Unknown Host

Aug 12, 2010

I am running the CTS on the Arm based phone. When I tried to run the Network related test cases.I am getting the above error in the "android.core.tests.luni.net" test package and due to this error around 179 test cases are getting failed.Please help me out.Is there any environment setting issue in the setting up the target.I have connected the target with the USB to my Fedora system. additionally target have the 3G Sim connected with It.

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Android :: Unknown Host When Connected In WiFi

Jun 12, 2009

I send files to FTP server in my application. Internet permission is set :
<uses-permission android:name="android.permission.INTERNET"/>
It works quite fine when connected with 3G/3G+. Sometimes, not very often, I get a "SocketException no route to host" or "unknown host" exception when trying to connect. When I'm connected with WIFI, it works sometimes and it's very fast, but the same error occurs very often, and when it has occurred I must restart my WiFi to be able to connect again, even with webbrowser. I use apache commons FTPClient this way:

ftpClient.connect(server, 21); ftpClient.login(user, password);
ftpClient.changeWorkingDirectory(directory); ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
BufferedInputStream buffIn = new BufferedInputStream(new FileInputStream(file));
ftpClient.enterLocalPassiveMode(); ftpClient.storeFile(file.getName(), buffIn); buffIn.close();
ftpClient.logout(); ftpClient.disconnect();

Errors look like this:
06-12 11:17:32.887: ERROR/DictoSyl(3146): No route to host 06-12 11:17:32.887:
ERROR/DictoSyl(3146): java.net.SocketException: No route to host 06-12 11:17:32.887:
ERROR/DictoSyl(3146): at org.apache.harmony.luni.platform.OSNetworkSystem.connectSocketImpl
(Native Method) 06-12 11:17:32.887: ERROR/DictoSyl(3146): at org.apache.harmony.luni.platform.OSNetworkSystem.connect (OSNetworkSystem.java:125) 06-12 11:17:32.887: ERROR/DictoSyl(3146): at org.apache.harmony.luni.net.PlainSocketImpl.connect (PlainSocketImpl.java:227) 06-12
11:17:32.887: ERROR/DictoSyl(3146): at org.apache.harmony.luni.net.PlainSocketImpl.connect (PlainSocketImpl.java:199) 06-12
11:17:32.887: ERROR/DictoSyl(3146): at java.net.Socket.startupSocket(Socket.java:734) 06-12 11:17:32.887: ERROR/DictoSyl(3146): at java.net.Socket.<init> (Socket.java:157) 06-12 11:17:32.887: ERROR/DictoSyl(3146): at org.apache.commons.net.DefaultSocketFactory.createSocket (DefaultSocketFactory.java:53) 06-12
11:17:32.887: ERROR/DictoSyl(3146): at org.apache.commons.net.SocketClient.connect(SocketClient.java:162) 06-12
11:17:32.887: ERROR/DictoSyl(3146): at com.sylpheo.core.android.ftp.FtpManager.start(FtpManager.java:43)

or:
ERROR:
java.net.UnknownHostException: ftpsylpheo.sylpheo.com - ftpsylpheo.sylpheo.com at java.net.InetAddress.lookupHostByName(InetAddress.java:522) at java.net.InetAddress.getByName(InetAddress.java:336) at
java.net.Socket.<init>(Socket.java:155) at org.apache.commons.net.DefaultSocketFactory.createSocket (DefaultSocketFactory.java:53) at org.apache.commons.net.SocketClient.connect(SocketClient.java:162) at com.sylpheo.core.android.ftp.FtpManager.start(FtpManager.java:43)

It looks like having forgot something that makes connection down after several uses of my ftp program, but what? And why does this work quite well (but not always) with 3G/EDGE connection?

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Android :: Sqlite Exception:java.lang.Illegal Argument Exception Column Id Does Not Exist

Jul 14, 2010

I created a sql lite database with the following columns:
static final String dbName="demoDB";
static final String tableName="Employees";
static final String colID="EmployeeID";
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE "+tableName+" ("+colID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+
colName+" TEXT, "+colAge+" Integer);");
I want to select all the records in the database like this and display them in a gridview:SQLiteDatabase db=this.getWritableDatabase();Cursor cur= db.rawQuery("Select "+colName+", "+colAge+" from "+tableName, new String [] {});String [] from=new String []{DatabaseHelper.colName,DatabaseHelper.colAge};
int [] to=new int [] {R.id.colName,R.id.colAge};
SimpleCursorAdapter sca=new SimpleCursorAdapter(this,R.layout.gridrow,c,from,to);
GridView grid=(GridView)findViewById(R.id.grid);
grid.setAdapter(sca);but i receive the following exception:java.lang.IllegalArgumentException: column '_id' does not exist.the db table does not have a column with name '_id'so what is wrong with this code

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General :: ZTE Nubia Z5s Recovery - Unknown Host Service

Jun 1, 2014

I can't get to recovery at all when i enter it i cant see the recovery but when i touch the screen it viberates and i thing i am pressing on the recovery stuff plus i cant root at all the adb says : unkown host service

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Android :: No Route To Host Exception On Socket

Jul 16, 2009

i am working on a client server program in android. i have a Main java class running on my pc as a server socket listening to the port 8626 and i am trying to connect android client (on real device ) to that server. i tried my local ip and it gives me no route to host exception please suggset which ip i need. if i use ip 10.0.2.2 and run on emulator it succeeds but not on real device. client and server both are on same pc, and android device is attached to my pc as well.

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Android :: Unknown Exception For Create Object Of FileTransferManager() Of Smack Library / Solve It

Jan 21, 2009

I am trying to create object of FileTransferManager manager = new FileTransferManager(this.connection);

it is giving error, the same error gives for , OutgoingFileTransfer otransfer = manager.createOutgoingFileTransfer("nimit@pc3/Smack");

I am testing demo app for android, smack library and openfire server (FileTransfer settings are enabled in open fire).

What is solution for this.

But when I put

try{

FileTransferManager manager = new FileTransferManager (this.connection);

}catch(Exception e){}

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Android :: IOException Java.net.UnknownHostException - Host Is Unre Www.google.com:443

Jul 21, 2010

I have a method that I use to get the auth token for a user. I have been using it for months with no problem.

All of the sudden today it stated failing with: IOException java.net.UnknownHostException: Host is unresolved: www.google.com:443

The manifest contains <uses-permission android:name="android.permission.INTERNET" />

The code has not changed since it worked. It is:

CODE:...................

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Android :: Unknown URI Error In Java Code And Url

Aug 25, 2009

Why I have this error? It' s the same java code than the following url:...........

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Android :: Java Io Exception In Streaming Media Player

Nov 5, 2009

i have a very simple test app (see below), that simply tries to play a streamed audio file below over and over. after running for about half an hour (the file itself is only like 3.5 minutes or so), I get the following error:

11-05 12:16:07.625: DEBUG/PlayerDriver(554): buffering (15) 11-05 12:16:07.635: DEBUG/PlayerDriver(554): buffering (16) 11-05 12:16:07.644: DEBUG/PlayerDriver(554): buffering (17) 11-05 12:16:07.654: DEBUG/PlayerDriver(554): buffering (18) 11-05 12:16:07.654: DEBUG/PlayerDriver(554): buffering (19) 11-05 12:16:07.724: ERROR/PlayerDriver(554): Command PLAYER_PREPARE completed with an error or info PVMFErrResource 11-05 12:16:07.724: ERROR/MediaPlayer(897): error (1, -17) 11-05 12:16:07.734: WARN/System.err(897): java.io.IOException: Prepare failed.: status=0x1 11-05 12:16:07.744: WARN/PlayerDriver(554): PVMFInfoErrorHandlingComplete 11-05 12:16:07.744: WARN/System.err(897): at android.media.MediaPlayer.prepare(Native Method) 11-05 12:16:07.744: WARN/System.err(897):at com.test.TestPlayer.onCompletion(TestPlayer.java:61) 11-05 12:16:07.754: WARN/System.err(897):.......

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Android :: Java Socket IO Exception - Permission Denied

Nov 2, 2010

i am trying to connect to a server on my network running a tcp listener using the following java code. I am getting am IOException - Permission Denied. It is from an android 2.2 emulator.Does anyone know why?Socket socket = new Socket("1.1.1.1", 1111);PrintWriter out = new PrintWriter( socket.getOutputStream(), true);Out.println("test");socket.close();

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Android :: Java Model Exception When Cleaning Project

Sep 30, 2009

I keep getting this error under several projects. 10 minutes ago I exported an android .apk, then changed the AndroidManifest.xml and now can't export. I reverted back to the original AndroidManifest.xml but still it doesn't work. I guess the plugin is broken. Is there a set of Ant tasks that can be used to build Android apps?

.............

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Android :: Could Not Parse Java.lang.NumberFormat Exception

Jul 31, 2010

CODE:............

And i got the following Exception

CODE:......................

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Android :: How To Handle Throws Clause In Java Exception Handling

Sep 4, 2010

I have class A in which I have a method openfileConnec().

It was written like the below:

CODE:...............

Now I come to class B where I will call this method like the below:

CODE:.............

I was asked a question in an interview as follows:

Why does the method have a throws Exception in its declaration? Is it that on of the methods called in the implementation throws the base class exception? Also If we get a exception during calling the method (fileConnect( )) control goes to catch block. After executing catch where should the control go, what should be sent to base case?

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Android :: Java Rare And Impossible Exception Causing Force Close

Apr 19, 2010

I have an interesting problem being reported to me from an android application I have published. I have a two-dimensional array that I am iterating through using two for loops like so:

for (int i = 0; i < arr.length; ++i)
{
for (int j = 0; j < arr[i].length; ++j)
{
if (arr[i][j] != 0)
// does stuff
}
}

The problem is, somehow arr[i][j] != 0 is throwing an ArrayIndexOutOfBoundsException. But very rarely. I have thousands of people use the app on a daily basis and get maybe twenty force close reports. Is this something I can't avoid, maybe a problem with the phones memory, etc. or is there something I can do that I haven't thought of yet?

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Android : Development Java Null Pointer Exception When Trying To Get String Extra()

Nov 6, 2010

In my main activity, I have the following code that calls my FileBrowser activity: What's wrong? Can I not use putExtra with startActivityForResult? Can putExtra only be used with startActivity? Code...

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Android :: Davlik Bug - UNEXPECTED TOP-LEVEL EXCEPTION: Java.lang.IllegalArgumentExcep­tion

May 10, 2009

I am attempting to integrate some previous libraries that we have within my new android project.

I have made several attempts including:

Importing the code as sub-projects (that are built using the android.jar)

Importing the code as jar files (from the built code)

Adding the files directly as part of my project

Reordering the dependencies

However for each one of these scenarios I keep getting the following exception thrown by the davlik compiler.

It is always picking the first class in the package (ie if I remove that class, it picks the next and so on).

It would appear to me that this is a compiler bug - somehow it's getting it's dependencies in a twist.

Anyone else experienced this? And/or have any ideas on how to get around this one?

UNEXPECTED TOP-LEVEL EXCEPTION:

CODE:................................

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Android :: Developing Java Game Script

Aug 18, 2010

I'm working on developing a game in Java for android phones and I was wondering if there was a place to view a complete game script so I could see all the components and how it's setup? Kind of like a dissection self-tutorial. Either a developer or website that offers game scripts in their entirety for android phones? I'm pretty new to Java programming and was just looking for a good example of a running game.

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Android :: 2D Game In Java Swing For Desktop Application

Oct 13, 2010

I have developed a 2D game in Java Swing for a desktop application. My characters are simply JLables that move around over a static background image. I do the animations for the characters walk sequences by changing their image every certain number of game logic loop iterations. Being new to android, what would be the best way to port my game over to android since Swing is not supported? Is there something like a JLabel that can be used for characters? A whole different approach?

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Android :: Android - Unhandled Event Loop Exception - Java.lang.StackOverflowError

Feb 23, 2010

This work flow is causing Eclipse to give me:

Unhandled event loop exception java.lang.StackOverflowError

Looking at the eclipse log it gives just a bit more information:

Unhandled event loop exception java.lang.StackOverflowError org.eclipse.ui

I am running: ....

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Android :: Exception With Web Service ( Java.net.SocketException Permission Denied) In Android

Nov 23, 2010

When I call a Web Service, it returns me this exception: java.net.SocketException Permission denied. I dont know waht is the actual problem. I don't know how to solve this? home.java page:............

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Android :: How To Store Path Of Game Pawn In Turn Based Game?

May 22, 2010

I have a square grid, for a turn based game ( grid is similar to the chess board ), but the moves in the games are different based on whether you have lapped your opponent pawn at least once or not.i.e if you have not lapped (beaten any of the opponents pawns) in the outer most grid as below.if you have lapped your opponent pawn once at least, then you get to reach home,this way.Any player having all his pawns reaching "home" first wins.The ones in yellow are safe-houses, i.e both the opponent pawn and the player's pawn get to stay in the same grid, this is not considered to be lapping ( the opponent ).The lapped pawn will return to its start point.Now the question is, what is the effective way to store the paths for the all the pawns.we will have 4 pawns for the player and 4 opponent pawns.Is there any pattern to store such static information, in a elegant way?

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Android : Puzzle Game With 7x7 Grid Of Graphics / How To Save And Continue Game

Nov 12, 2010

I have a puzzle game with a 7x7 grid of graphics, and a timer, its just about ready to go. But I am stuck on how to go about saving/continuing game. For example when someone exits I want them to be able to save and exit, then come back and click continue to pick up where they left off with all of the graphics in the right place, timer and score. I looked at onSaveInstanceState android examples, but not sure if this is what I need or how to implement it in my case.

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Android :: Call Java File On Click In Another Java Class?

May 19, 2010

i have two files

App.java
Gallery.java

App. java contains frontend buttons and functionalities Gallery.java lists the imagesin the sd card. i want to call Gallery.java in click event in app.java

App.java
package gallery.display;
import android.app.Activity;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;...........

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Android : Can Not Call A Java Method Using Add Java Script Interface()

Mar 16, 2009

I'm trying to call a java method from javascript using addJavascriptInterface(); but seems does not work, it always display "failure"; java code...

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Android :: Tab Host Disappears

Aug 10, 2010

I am developing an Android application consisting of 4 tabs. On the first tab I have a button, which again calls an Activity called ActivityA.When my ActiviyA is started, the tab control is not shown anymore.

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Android :: Host Is Unresolved In LAN

Jul 6, 2010

Im getting a IOExeption 'Host is unresolved' on HttpPost. The Endpoint in this case a a computer on my LAN with a webservice. Im using WIFI to my LAN. Does Android know to to resolved computernames?

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Android :: Tab Host Without Tab Activity

Jul 2, 2010

I want to create tabs without extending TabActivity. (The reason is that TabActivity cannot handle a custom titlebar as it seems). I have public class startTab extends Activity I read somewhere that I have to use a LocalActivityManager, I assume that I am missing something there. Anyone an idea?

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Android :: Java.io / Java.Lang Different From Packages In Windows?

Aug 8, 2009

Java packages like Java.io, Java.Lang etc used in android, are they different from Java packages in windows ? means specially made for android ?

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