How to avoid yum from automatically running via PackageKit on Fedora

Run this:

sudo /usr/bin/gpk-prefs

Then choose the "Never" option.

How to change the screensaver lock timeout in Fedora 20 and Gnome

Run this on the command line (in Terminal):

gsettings set org.gnome.desktop.session idle-delay 3600

Change 3600 to anything else you want.  The units are in seconds.

Install nvidia driver on Fedora Linux

See http://forums.fedoraforum.org/showthread.php?t=234595

How to fix HDMI problem on Dell XPS 14 (2012 or 2013 version)

My HDMI port stopped working on both Fedora 19 and Windows 7 on my Dell XPS 14 laptop, which I purchased in 2013.  You may also have this problem with the Dell XPS 12 laptop.  Unfortunately, the solution to fix it was replace the motherboard, which Dell was able to do for no charge since my system had 1 week of warranty left.  If you don't have a warranty, you might be in an unfortunate situation.

I had been using the HDMI port for almost a year with no problems on both Linux and Windows.  When I started using the Display Port with the HDMI port to drive two external monitors, that worked for about a week, and then the HDMI port stopped working.  The Dell tech support person on the phone said that they do not recommend that I use both the HDMI and Display Port at the same time on the Dell XPS 14 model, because there is not enough power to drive both (for this particular laptop model).

Here is another guy who had a different Dell model with the same issue, and he also replaced the motherboards: http://www.experts-exchange.com/Hardware/Displays_Monitors/Q_28337978.html

How to hide keyboard when losing Text Field focus in iOS/iPhone/iPad programming in Objective C when using a UIScrollView

If you are making an iOS/iPhone/iPad app, and you are trying to hide the keyboard when clicking outside the UITextField, you can do this:

1) Make sure that your UITextField has an IBOutlet in the ViewController.h file.  If you need to set this up, open the "Assistant editor", click on the storyboard, make sure that the ViewController.h file is in the other window, and Ctrl-drag the UITextField down to the ViewController.h file.

2) Make sure that the Scroll View has a delegate connected to the View Controller.  If you need to set this up, click on the Scroll View, open the "Connections inspector", and drag the circle next to the delegate to the View Controller in the "View Controller Scene" menu

3) In your ViewController.m file, add in a function that looks like this:

-(void)scrollViewDidScroll:(UIScrollView *)scrollView

{

    [_myTextField endEditing:YES];

}

4) Instead of _myTextField, use whatever name you used in step 1 above.

Download a password protected webpage with Objective C for iOS/iPhone/iPad

1) Go to http://allseeing-i.com/ASIHTTPRequest and download the latest version (the .tar tarball file)

2) In Xcode, in your project, click on the file folder icon, which is the top left button, so that you can see all the .h and .m files in your project.

3) Open the .tar file in Finder, and drag-and-drop the Classes/ASI* files to Xcode, on the left hand side, in the same directory that the rest of your .h and .m files are.  NOTE: Don't copy the files manually through the command line (Terminal) nor outside of Xcode.

4) If you are creating an iPhone app, drag-and-drop the External/Reachability/Reachability* files to Xcode, on the left hand side, in that same directory.

5) Go to http://allseeing-i.com/ASIHTTPRequest/Setup-instructions and follow the step 2 directions, which is setting up the Build Phases.

6) If you are using ARC, then you need to disable ARC for the ASI* and Reachability* files.  Click on your main project on the left hand side, then choose "Build Phases", and expand the "Compile Sources" section.  For all of the ASI* and Reachability.m files, add in the following flag for "Compiler Flags": -fno-objc-arc (Also see http://stackoverflow.com/questions/6646052/how-can-i-disable-arc-for-a-single-file-in-a-project)

7) At the top of your .m file where you want to download the webpage, paste the following line:

#import "ASIHTTPRequest.h"

8) In that same .m file, download the file by doing this:

    NSString* url = @"http://www.google.com";

    NSURL *nsurl = [NSURL URLWithString:url];
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:nsurl];
    [request setUsername:@"enterUsernameHere"];
    [request setPassword:@"enterPasswordHere"];

    

    [request startSynchronous];

    NSError *error = [request error];
    if (!error) {
        NSString *response = [request responseString];
        NSLog(response);
    }

That's it!

Solving "Error initializing QueryElevationComponent." with Solr

You may be getting the following error message when trying to start up Solr:

ERROR - 2014-08-11 16:49:49.554; org.apache.solr.core.CoreContainer; Unable to create core: collection1
org.apache.solr.common.SolrException: Error initializing QueryElevationComponent.
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:868)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:643)
        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:556)
        at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:261)
        at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:253)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.solr.common.SolrException: Error initializing QueryElevationComponent.
        at org.apache.solr.handler.component.QueryElevationComponent.inform(QueryElevationComponent.java:251)
        at org.apache.solr.core.SolrResourceLoader.inform(SolrResourceLoader.java:651)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:851)
        ... 10 more

If you're getting this error, you may have changed your primary index from a string to an int.

To fix this, edit your example/solr/collection1/conf/elevate.xml file, and change it to the following:

<?xml version="1.0" encoding="UTF-8" ?>

<!-- ... -->

<elevate>

 <query text="foo bar">

<!--

  <doc id="1" />

  <doc id="2" />

  <doc id="3" />

-->

 </query>

 <query text="ipod">

<!--   <doc id="MA147LL/A" />  

   <doc id="IW-02" exclude="true" />

-->

 </query>

</elevate>

Specifically, comment out the <doc ... /> tags.

How to retrieve a Text Field value in iOS/iPad/iPhone programming in Xcode

1) Drag the Text Field onto your storyboard

2) On the top right side of the screen, you'll see a button that looks like a tux with a bow tie.  It is labeled "Show the Assistant Editor".  Click on that button

3) You should see the storyboard side-by-side to a text window showing code.  Make sure that the .h is showing, such as ViewController.h - you can switch the file by clicking on "Automatic".

4) Scroll the text edit window down to the end, right before "@end".

5) Hold down control, and drag the Text Field to the ViewController.h text edit windows, and drop it right before the "@end".  Type in any name for the Text Field, such as textEntryField.

6) In the callback function (not necessarily a callback function for the Text Field) in the ViewController.m file, you can retrieve the value of the Text Field through "_textEntryField.text".  For example:

NSString* entryText = _textEntryField.text;

NSLog(@"The text in the Text Field is: %@", entryText);

Create callback to respond to button click in iOS with Xcode

1) Click on the storyboard that has the Button that you want to respond to.

2) Near the top right corner, you'll see a button that looks like a tux with a bow tie, entitled "Show the Assistant Editor".  Click on that.

3) Make sure that the .m file is showing (e.g. ViewController.m)

4) Hold down control and drag the button from the storyboard down to the text editor which will create a new function.  Type in a name for the function, such as "buttonTapped".

5) Click "Connect".

6) Now, fill in the callback function.

How to access a webpage/URL in Android using Apache .htaccess/.htpasswd password authentication

You can't download a webpage in the main thread.  You have to create an asynchronous task.  Here's how to do that:

Create a class called RetrieveFeedTask (change the hilighted text):


class RetrieveFeedTask extends AsyncTask<String, Void, Long> {

    private Exception exception;

    @SuppressLint("NewApi") protected Long doInBackground(String urlParam) {

     try 
   {
       DefaultHttpClient client = new DefaultHttpClient();
       client.getCredentialsProvider().setCredentials(new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT), new UsernamePasswordCredentials("username", "password")); 
       HttpGet request = new HttpGet(urlParam);
       
       HttpResponse response = client.execute(request);
        
       HttpEntity entity = response.getEntity();
       InputStream inputStream = entity.getContent();
       
       StringWriter writer = new StringWriter();
       String encoding = StandardCharsets.UTF_8.name();
       IOUtils.copy(inputStream, writer, encoding);
       
       StringBuffer sb = writer.getBuffer(); 
       String finalstring = sb.toString();
        
   } 
   catch (IOException e) 
   {
       // TODO Auto-generated catch block
       e.printStackTrace();
   }
    catch (Exception e)
    {
e.printStackTrace();
    }
   
    return new Long(0L);
   
    }

     @Override
     protected Long doInBackground(String... arg0) {
return this.doInBackground(arg0[0]);
     }
}


In your activity file, open the url like this:

String url = "http://www.myPasswordProtectedWebServer.com";
new RetrieveFeedTask().execute(url);



In your AndroidManfiest.xml file, be sure to add the following:

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

Solution derived from http://stackoverflow.com/questions/6343166/android-os-networkonmainthreadexception

Installing iOS 5.1 simulator on XCode 5.1

After upgrading to XCode 5.1, the iOS 5.1 simulator has been removed. You can restore it by using this procedure:

http://stackoverflow.com/questions/22479215/install-ios-5-simulator-to-xcode-5-1

How to get the scroll view working in an iOS iPad/iPhone app

It's not straight forward, but it's not too bad to set up.  Here's a good tutorial about how to do it, which will only take 9 minutes (plus or minus) of your life:

https://www.youtube.com/watch?v=-lt1o_k9jUw

How to get a Picker working in Xcode for an iOS iPad/iPhone app

If you drag and drop a Picker onto the Storyboard, the picker won't show.  You have to connect it up to a data source.  Here's how to do that:

http://www.techotopia.com/index.php/An_iOS_7_UIPickerView_Example#The_PickerViewController.h_File