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  • Event sourcing: Write event before or after updating the model

    - by Magnus
    I'm reasoning about event sourcing and often I arrive at a chicken and egg problem. Would be grateful for some hints on how to reason around this. If I execute all I/O-bound processing async (ie writing to the event log) then how do I handle, or sometimes even detect, failures? I'm using Akka Actors so processing is sequential for each event/message. I do not have any database at this time, instead I would persist all the events in an event log and then keep an aggregated state of all the events in a model stored in memory. Queries are all against this model, you can consider it to be a cache. Example Creating a new user: Validate that the user does not exist in model Persist event to journal Update model (in memory) If step 3 breaks I still have persisted my event so I can replay it at a later date. If step 2 breaks I can handle that as well gracefully. This is fine, but since step 2 is I/O-bound I figured that I should do I/O in a separate actor to free up the first actor for queries: Updating a user while allowing queries (A0 = Front end/GUI actor, A1 = Processor Actor, A2 = IO-actor, E = event bus). (A0-E-A1) Event is published to update user 'U1'. Validate that the user 'U1' exists in model (A1-A2) Persist event to journal (separate actor) (A0-E-A1-A0) Query for user 'U1' profile (A2-A1) Event is now persisted continue to update model (A0-E-A1-A0) Query for user 'U1' profile (now returns fresh data) This is appealing since queries can be processed while I/O-is churning along at it's own pace. But now I can cause myself all kinds of problems where I could have two incompatible commands (delete and then update) be persisted to the event log and crash on me when replayed up at a later date, since I do the validation before persisting the event and then update the model. My aim is to have a simple reasoning around my model (since Actor processes messages sequentially single threaded) but not be waiting for I/O-bound updates when Querying. I get the feeling I'm modeling a database which in itself is might be a problem. If things are unclear please write a comment.

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  • Building Current Selenium?

    - by user296241
    Hi guys, On the official Selenium blog (http://seleniumhq.wordpress.com/) it mentions that Maven is no longer used to build the Selenium project. Can anyone provide me some guidance on the new preferred method for building the selenium project? Everything I've found online is really out of date, referencing the old SVN repos and Maven. Thanks in advance! -Dan

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  • Core Data and NSDate

    - by Pierre
    Hi ! I read this post but I don't really understand the code... I have a core data database with an Entity and some attributes. One of them is named "myDate" and has for type NSDate. Now I want to to display each date but eliminate dates with same day-month-year and display them ascendantly . Have you got an idea? Thanks a lot !

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  • How to loop an executable command in the terminal in Linux?

    - by user1452373
    Let me first describe my situation, I am working on a Linux platform and have a collection of .bmp files that add one to the picture number from filename0022.bmp up to filename0680.bmp. So a total of 658 pictures. I want to be able to run each of these pictures through a .exe file that operates on the picture then kicks out the file to a file specified by the user, it also has some threshold arguments: lower, upper. So the typical call for the executable is: ./filter inputfile outputfile lower upper Is there a way that I can loop this call over all the files just from the terminal or by creating some kind of bash script? My problem is similar to this: Execute a command over multiple files with a batch file but this time I am working in a Linux command line terminal. Thank you for your help, Luke H

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  • MSSQL 2008 FTS CONTAINSTABLE Not Returning More Than Five Rows

    - by Elijah Glover
    I have a single table called "Indexes", it contains one nvarchar and three ntext columns (all Full Text Indexes). Index is up to date. CONTAINSTABLE(Indexes, *), 'test', 5) //5 results No matter what I change the above keyword too, it only returns the first 3-5 results. It should roughly return 90-120 results, for the above query. SELECT count(*) FROM Indexes WHERE [Description] like '%test%' //122 results How would I start to troubleshoot this problem?

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  • querying for timestamp field in django

    - by Hulk
    In my views i have the date in the following format s_date=20090106 and e_date=20100106 The model is defined as class Activity(models.Model): timestamp = models.DateTimeField(auto_now_add=True) how to query for the timestamp filed with the above info. Activity.objects.filter(timestamp>=s_date and timestamp<=e_date) Thanks.....

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  • PNGs alpha transparancy in AS3 - Unknown file-type

    - by WiseDonkey
    Hello there! After whittling down of the options we've encountered a problem with PNG's and ActionScript 3 (AS3). When loading a PNG 8 or PNG 32 with alpha transparancy we're getting the following error reported in Flash:- "Error #2124: Loaded file is an unknown type" Now, we're dealing with some legacy images, and it appears as though this problem isn't universal - some images believed to be 32bit alpha PNG are loading. BUT, some conclusions:- converting one image that was 32 bit alpha (NOT WORKING IN AS3) to PNG 8 index transparency DID work. And converting that same image to PNG 8 alpha DID NOT work. These all worked in AS2 There is no difference between the headers Headers of a Failing Image [0] => HTTP/1.1 200 OK [1] => Date: Tue, 06 Apr 2010 14:17:28 GMT [2] => Server: Apache/2.2.3 (Red Hat) [3] => Last-Modified: Tue, 06 Apr 2010 13:44:05 GMT [4] => ETag: "3700054-11d6-a3983340" [5] => Accept-Ranges: bytes [6] => Content-Length: 4566 [7] => Connection: close [8] => Content-Type: image/png Headers of a Working Image [0] => HTTP/1.1 200 OK [1] => Date: Tue, 06 Apr 2010 14:19:02 GMT [2] => Server: Apache/2.2.3 (Red Hat) [3] => Last-Modified: Fri, 30 Oct 2009 18:38:08 GMT [4] => ETag: "ba8057-65f2-5445c400" [5] => Accept-Ranges: bytes [6] => Content-Length: 26098 [7] => Connection: close [8] => Content-Type: image/png Any thoughts of a direction of further investigation or thoughts on a bewildering problem with little to no documentation; very warmly welcomed. EDIT Now it would appear as though something in the PHP conversion of the images is shafting; I use the following PHP to add alpha layers:- imagealphablending($image_p, false); ImageSaveAlpha($image_p, true); ImageFill($image_p, 0, 0, IMG_COLOR_TRANSPARENT);

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  • How to write java program to increase file limit using ulimit

    - by Sunil Kumar Sahoo
    I am using Fedora linux where ulimit -n 10000 increases file limit upto 10000. I want to achieve the same using java program How to write java program to increase file limit using ulimit I have tried with the below program but it didnot work well. The program didnot give any error. but didnot increase file limit also public class IncreaseFIle { public static void main(String[] args) { String command = "/bin/bash ulimit -n 10000"; // String command = "pwd"; try { Runtime.getRuntime().exec(command); } catch (IOException ex) { ex.printStackTrace(); } } } Thanks Sunil Kumar Sahoo

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  • Programming challenge: can you code a hello world program as a Palindrome?

    - by Assaf Lavie
    So the puzzle is to write a hello world program in your language of choice, where the program's source file as a string has to be a palindrome. To be clear, the output has to be exactly "Hello, World". Edit: Well, with comments it seems trivial (not that I thought of it myself of course [sigh].. hat tip to cobbal). So new rule: no comments. Edit: I feel kind of bad editing someone else's question to say this, but it will eliminate a lot of non-palindromes that keep popping up, and I'm tired of seeing the same simple mistake over and over. The following is NOT a palindrome: ()() The following IS a palindrome: ())( Brackets, parenthesis, and anything else that must match are a major barrier to palindrome-ing, yes, but that doesn't mean you can ignore them and post non-palindrome answers. Languages represented thus far: C, C++, Bash, elisp, C#, Perl, sh, Windows shell, Java, Common Lisp, Awk, Ruby, Brainfuck, Funge, Python, Machine Language, HQ9+, Assembly, TCL, J, php, Haskell, io, TeX, APL, Javascript, mIRC Script, Basic, Orc, Fortran, Unlambda, Pseudo-code, Befunge, CFML, Lua, INTERCAL, VBScript, HTML, sed, PostScript, GolfScript, REBOL, SQL

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  • Calculating the total in JavaScript

    - by DAFFODIL
    OP, please replace this text with a detailed description of your problem. Your code is below. I used document.getElementById but the math is not working. I need total to be calculated: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <title></title> <script type = "text/javascript"> function a() { var q = document.getElementById('ad').value; document.getElementById('s').value=q + q; } </script> </head> <?php $con = mysql_connect("localhost","root",""); if (!$con) { die('Could not connect: ' . mysql_error()); } mysql_select_db("form1", $con); error_reporting(E_ALL ^ E_NOTICE); $nam=$_GET['msg']; $row=mysql_query("select * from inv where Name='$nam'"); while($row1=mysql_fetch_array($row)) { $Name=$row1['Name']; $Address =$row1['Address']; $City=$row1['City']; $Pincode=$row1['Pincode']; $No=$row1['No']; $Date=$row1['Date']; $DCNo=$row1['DCNo']; $DcDate=$row1['DcDate']; $YourOrderNo=$row1['YourOrderNo']; $OrderDate=$row1['OrderDate']; $VendorCode=$row1['VendorCode']; $SNo=$row1['SNo']; $descofgoods=$row1['descofgoods']; $Qty=$row1['Qty']; $Rate=$row1['Rate']; $Amount=$row1['Amount']; } ?> <body> <form id="form1" name="form1" method="post" action=""> <table width="846" border="0"> <tr> <td width="411" height="113">&nbsp;</td> <td width="412">&nbsp;</td> </tr> </table> <table width="846" border="0"> <tr> <td height="38">&nbsp;</td> </tr> </table> <table width="846" border="0"> <tr> <td width="390" rowspan="4">&nbsp;</td> <td width="92" height="35">&nbsp;</td> <td width="136"><?php echo $No;?></td> <td width="36">&nbsp;</td> <td width="170"><?php echo $Date;?></td> </tr> <tr> <td height="37">&nbsp;</td> <td><?php echo $DCNo;?></td> <td>&nbsp;</td> <td><?php echo $DcDate;?></td> </tr> <tr> <td height="34">&nbsp;</td> <td><?php echo $YourOrderNo;?></td> <td>&nbsp;</td> <td><?php echo $OrderDate;?></td> </tr> <tr> <td height="29">&nbsp;</td> <td><?php echo $VendorCode;?></td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> </table> <table width="845" border="0"> <tr> <td height="38">&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> <tr> <td width="34">&nbsp;</td> <td width="457">&nbsp;</td> <td width="104">&nbsp;</td> <td width="79">&nbsp;</td> <td width="149">&nbsp;</td> </tr> <?php $i=1; $row=mysql_query("select * from inv where Name='$nam'"); while($row1=mysql_fetch_array($row)) { $descofgoods=$row1['descofgoods']; $Qty=$row1['Qty']; $Rate=$row1['Rate']; $Amount=$row1['Amount']; ?> <tr> <td><?php echo $i;?></td> <td><?php echo $descofgoods;?></td> <td><?php echo $Qty;?></td> <td><?php echo $Rate;?></td> <td><input name="Amount" type = "text" id ="ad" value="<?php echo $Amount;?>" /></td> </tr> <?php $i++;} ?> </table> <table width="844" border="0"> <tr> <td width="495" height="1065">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <input type="text" name="textfield2" /> &nbsp; &nbsp; &nbsp; &nbsp; </td> <td width="191">&nbsp;</td> <td width="144"><input type="text" name="tot" id="s" onclick="a()"; /></td> </tr>

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  • How to install MinGW Correctly on Windows

    - by Ell
    Hello all, I have recently started learning C++ but I require a compiler. I have tried the one packaged with Code::Blocks but I have been told it is out of date. I have tried reading the instructions on the website but I simply don't know which files to download and un-zip. Does anyone know of a list of files to download? (latest version) and a folder structure I need? thanks in advance, ell.

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  • Visual Studio 2010 isn't building before a run when there are code changes. It was doing working yes

    - by jamone
    I've been using using F5 (Start Debugging) for years to build the code (if its out of date), and then debug. This was working on VS 2010 also, however today it just start debugging without a build. Say I do a clean on the project, and then hit F5 instead of building it so it can run it throws an error message saying that the exe doesn't exist to run. How do I make it build first? What could have changed?

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  • Ajax doesn't trigger a change-event on a webkit based browser

    - by user319464
    I have adapted a Jquery plugin to for-fill my needs to send GET requests to servers as a way of "pinging" them. I've also added some javascript code to add some fancy features like: depending on the changed value in a that the Jquery plugin changes, it changes the Icon accordingly. To make it all work essentially, I made so that when Ajax gets a "complete" event, it forces a "onChange" event to the span, triggering the javascript validation function to change the status icons. Here is the code of my slightly modified jQuery Plugin: /** * ping for jQuery * * Adapted by Carroarmato0 (to actually work instead of randomly "pinging" nowhere instead of faking * * @auth Jessica * @link http://www.skiyo.cn/demo/jquery.ping/ * */ (function($) { $.fn.ping = function(options) { var opts = $.extend({}, $.fn.ping.defaults, options); return this.each(function() { var ping, requestTime, responseTime ; var target = $(this); var server = target.html(); target.html('<img src="img/loading.gif" alt="loading" />'); function ping() { $.ajax({url: 'http://' + server, type: 'GET', dataType: 'html', timeout: 30000, beforeSend : function() { requestTime = new Date().getTime(); }, complete : function() { responseTime = new Date().getTime(); ping = Math.abs(requestTime - responseTime); if (ping > 2000) { target.text('niet bereikbaar'); } else { target.text(ping + opts.unit); } target.change(); } }); } ping(); opts.interval != 0 && setInterval(ping,opts.interval * 1000); }); }; $.fn.ping.defaults = { interval: 3, unit: 'ms' }; })(jQuery); target.change(); is the code that triggers the "onchange" event in the span: echo " <td class=\"center\"><span id=\"ping$pingNb\" onChange=\"checkServerIcon(this)\" >" .$server['IP'] . "</span></td>"; In Firefox this works, checkServerIcon(this) gets executed and passes the span object to the function. function checkServerIcon(object) { var delayText = object.innerHTML; var delay = delayText.substring(0, delayText.length - 2); if ( isInteger(delay) ) { object.parentNode.previousSibling.parentNode.getElementsByTagName('img')[0].src = 'img/servers/enable_server.png'; } else { if (delay == "bezig.") { object.parentNode.previousSibling.parentNode.getElementsByTagName('img')[0].src = 'img/servers/search_server.png'; } else { object.parentNode.previousSibling.parentNode.getElementsByTagName('img')[0].src = 'img/servers/desable_server.png'; } } } My guess would be that there's something different in WebKit browsers in the way object.parentNode.previousSibling.parentNode. .... works...

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  • Good alternative to .net DateTimePicker?

    - by Caleb
    I can't really explain why exactly, but I really hate the .net DateTimePicker control built into C#.net and VB.net. Is anyone aware of a good alternative to either of these controls which is freely available? I'm sure I'm not the only one who doesn't like the control. The date picker in Google Calendar is one which I really like, so I'd love something like that which I can use in a .net app.

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  • how to run phantomjs on heroku?

    - by mathieurip
    I am trying to run phantomjs on the heroku cedar stack. I am using a phantomjs buildpack for heroku https://github.com/stomita/heroku-buildpack-phantomjs. However I followed the instructions but still cannot make it work. When I run the command heroku run bash and type phantomjs --version it says phantomjs: command not found I read things about LD_LIBRARY_PATH that needs to be set to "/usr/local/lib:/usr/lib:/lib:/app/vendor/phantomjs/lib", this is what i did but without success. Is there something that i am missing ? Where does the buildpack install the phantomjs binary exactly ? Is there a way to know the path where the binary is ? I am using ruby 1.9.2 Thanks a lot for your help. EDIT: To be more precise, i want to combine ruby and phantomjs, so i am using this custom buildpack: https://github.com/ddollar/heroku-buildpack-multi, but when i push to heroku i get "Heroku push rejected, failed to compile Multipack app"

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  • Can I get a dump of all my databases *except one* using mysqldump?

    - by Daniel Magliola
    I'm currently using mySQLdump to backup my dev machine and servers. There is one project I just started, however, that has a HUUUUUGE database that I don't really need backed up, and i'll be a big problem to add it to the rest of the backup cycle. I'm currently doing this: "c:\Program Files\mysql\MySQL Server 5.1\bin\mysqldump" -u root -pxxxxxx --all-databases g:\backups\MySQL\mysqlbackup.sql Is it possible to somehow specify "except this database(s)"? I wouldn't like to have to specify the list of DBs manually, since that would mean that I'd have to remember updating my backup batch file every time I create a new DB, and I know that's not gonna happen. EDIT: As you probably guessed from my command line above, i'm doing this on Windows, so I can't do any kind of fancy bash stuff, only wimpy .bat things. Alternatively, if you have other ideas to solve this same issue, they are more than welcome, of course! Thanks Daniel

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  • Firebug is throwing a ' $( ' error?

    - by Kyle
    I am getting a strange error in Firebug, that I am not getting in Webkit. The error comes up as ' $( ' in firebug. Here's the code that is supposedly causing it to flip: $.getScript("http://kylehotchkiss.com/min/?g=packageHome", function() { $(".countdown").countdown({ until: new Date(2010, 6 - 1, 5), layout:'{dn} {dl}' }); }); The error isn't specific to the countdown script, it's just giving me an error trying to call any plugin I just loaded in firefox. Any ideas?

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  • clarification on yslow rules

    - by ooo
    i ran yslow and i got a bad score on expires header: Here was the message: Grade F on Add Expires headers There are 45 static components without a far-future expiration date. i am using IIS on a hosted environment. what do i need to do on my css or js files to fix this issue ?

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  • Rails / ActiveRecord Modeling Help

    - by JM
    I’m trying to model a relationship in ActiveRecord and I think it’s a little beyond my skill level. Here’s the background. This is a horse racing project and I’m trying to model a horses Connections over time. Connections are defined as the Horse’s Current: Owner, Trainer and Jockey. Over time, a horse’s connections can change for a lot of different reasons: The owner sells the horse in a private sale The horse is claimed (purchase in a public sale) The Trainer switches jockeys The owner switches trainers In my first attempt at modeling this, I created the following tables: Horses, Owners, Trainers, Jockeys and Connections. Essentially, the Connections table was the has-many-through join table and was structured as follows: Connections Table 1 Id Horse_id Owner_id Trainer_id Jockey_id Status_Code Status_Date Change_Code The Horse, Owner, Trainer and Jockey foreign keys are self explanatory. The status code is 1 or 0 (1 active, 0 inactive) and the status date is the date the status changed. Change_code is and integer or string value that represent the reason for the change (private sale, claim, jockey change, etc) The key benefit of this approach is that the Connection is represented as one record in the connections table. The downside is that I have to have a table for Owner (1), Trainer (2) and Jockey (3) when one table could due. In my second attempt at modeling this I created the following tables: Horses, Connections, Entities The Entities tables has the following structure Entities Table id First_name Last_name Role where Role represents if the entity is a Owner, Trainer or Jockey. Under this approach, my Connections table has the following structure Connections Table 2 id Horse_id Entity_id Role Status_Code Status_Date Change_Code 1 1 1 1 1 1/1/2010 2 1 4 2 1 1/1/2010 3 1 10 3 1 1/1/2010 This approach has the benefit of eliminating two tables, but on the other hand the Connection is now comprised of three different records as opposed to one in the first approach. What believe I’m looking for is an approach that allows me to capture the Connection in one record, but also uses an Entities table with roles instead of the Owner, Trainer and Jockey tables. I’m new to ActiveRecord and rails so any and all input would be greatly appreciated. Perhaps there are other ways that would even be better. Thanks!

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  • git- how to troubleshoot "cannot find command"

    - by Frank Schwieterman
    I need help getting git extensions to run with msysgit. I have had bad luck with extensions git-tfs and git-fetchall, in both cases it is the same problem. The addon will require a file to be placed where git can find it (git-tfs.exe and git-fetchall.sh). I understand this to mean the files need to be in a directory that is in the 'PATH' environment variable. In both cases I get stuck at this point: $ git-diffall bash: git-diffall: command not found When I run echo %PATH% from a regular command shell, it shows my path variable includes the directories where git-diffall and git-tfs are. How can I debug this, or am I missing something? Is there a way within msysgit to verify the command search path is what I expect?

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  • Android OnClick in ListView calling parent function

    - by user1321683
    I have an Android application with a ListView in it, the ListView will setup fine but now I want a image in the ListView to be clickable. I do this by using 2 classes, the Activity class (parent) and an ArrayAdapter to fill the list. In the ArrayAdapter I implement a OnClickListener for the image in the list that I want to be clickable. So far it all works. But now I want to run a function from the activity class when the onClick, for the image in the list, is run but I do not know how. Below are the 2 classes that I use. First the Activity class: public class parent_class extends Activity implements OnClickListener, OnItemClickListener { child_class_list myList; ListView myListView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // setup the Homelist data myList = new child_class_list (this, Group_Names, Group_Dates); myListView = (ListView) findViewById(R.id.list); // set the HomeList myListView.setAdapter( myList ); myListView.setOnItemClickListener(this); } void function_to_run() { // I want to run this function from the LiscView Onclick } public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // do something } } And the ArrayAdapter from where I want to call a function from the Activity class: public class child_class_list extends ArrayAdapter<String> { // private private final Context context; private String[] mName; private String[] mDate; public child_class_list (Context context, String[] Name, String[] Date) { super(context, R.layout.l_home, GroupName); this.context = context; this.mName = Name; this.mDate = Date; } @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); View rowView = inflater.inflate(R.layout.l_home, parent, false); ImageView selectable_image = (ImageView) rowView.findViewById(R.id.l_selectable_image); selectable_image.setOnClickListener(new OnClickListener() { public void onClick(View v) { // I want to run the function_to_run() function from the parant class here } } ); // get the textID's TextView tvName = (TextView) rowView.findViewById(R.id.l_name); TextView tvDate = (TextView) rowView.findViewById(R.id.l_date); // set the text tvName.setText (mName[position]); tvDate.setText (mDate[position]); return rowView; } } If anyone knows how to run the function in the activity class from the arrayadapter or how to set the image onClickListener in the Activity Class I would greatly apriciate the help.

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