DiDos-Blog

Really radiactivity counter for Android

2012-01-16T23:03:00.000-08:00

RadioactivityCounter for Android - REAL working Geiger counter + 10Sv/h Image

Mactini

2011-12-15T06:00:00.000-08:00

Mactini :D

Web-App vs. Native-App

2011-12-15T00:37:00.000-08:00

In these situations you can/should develop a Web-App:

Server-centralized resources, logic, etc.
SaaS (Software-as-a-Service) billing model
App with sensitive data, which must to stay behind firewall
Cross-Platform compatibility
Zero footprint

In these situations you can/should develop a Native-App:

App must be able to work offline and online
Requires substantial access to the local system’s resources, particularly CPU/RAM
Performance
Integration with other systems
Heavy graphics work
Desktop-quality UI widgets

A very good article you will find here.

How to get month name from month number (objective c)?

2011-12-02T02:08:00.000-08:00

With NSDateFormatter it is possible to get month symbols:

NSString *monthsymbol = [[dateFormatter monthSymbols] objectAtIndex:monthNumber - 1];

Note: you'll need to subtract 1 from your 1..12 month number.

With NSDateFormatter you can get symbols for AM/PM/weeks/quarter/era-symbols.

Remove all subviews from scrollview

2011-12-01T07:40:00.001-08:00

This lines of code removes all subviews from scrollview:

for(UIView *subview in [scrollview subviews]) {
   [subview removeFromSuperview];
}

Set background color of UITableViewCell with an accessory

2011-11-30T06:42:00.000-08:00

I tried to set background color of a UITableViewCell with an accessory in "cellForRowAtIndexPath"-function.

cell.backgroundColor = [UIColor grayColor]; --> will not work.
cell.backgroundView.backgroundColor = [UIColor grayColor]; --> will not work.

cell.contentView.backgroundColor = [UIColor grayColor]; --> set only contentView to gray, but not accessoryView, textLabel, etc...

To resolve this problem you must set background of the cell in the "willDisplayCell"-function.

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath

{

    NSUInteger row = [indexPath row]; 

    if(row % 2){

        [cell setBackgroundColor:[UIColor whiteColor]];

    }

    else{  

        [cell setBackgroundColor:[[UIColor alloc] initWithRed:((float)(222.0 / 255.0)) green:((float)(227.0 / 255.0)) blue:((float)(231.0 / 255.0)) alpha:1.0f]];

    }

}

Giving focus to UISearchBar

2011-11-28T04:22:00.000-08:00

If you want set the focus to UISearchBar, so call simply "becomeFirstResponder" on the searchbar:

[searchBar becomeFirstResponder];

Why gridlines does not show when custom label is used (core-plot & iPhone)?

2011-11-23T23:46:00.000-08:00

If you customize the axis labels the gridlines are not more displayed. For resolve this you must set the majorTickLocation manually:

...

axisSet.xAxis.majorTickLocations = [[NSSet alloc] initWithObjects: [NSNumber numberWithInt:0],[NSNumber numberWithInt:2],[NSNumber numberWithInt:4],[NSNumber numberWithInt:6],nil];

...

How to place x-axis at the minimum y-value for the plot (core-plot)

2011-11-23T05:32:00.000-08:00

In my project i have this chart with core-plot:

But i wish the x-axis was placed at the minimum y-value for the plot (about 5.0), instead of at 0.

Solution:
1. set yRange

...

CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace*)graph.defaultPlotSpace;

...

plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(5.0) length:CPTDecimalFromDouble(maxY)];

...

2. and then push up the xAxis

...

CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;

...

axisSet.xAxis.orthogonalCoordinateDecimal = CPTDecimalFromFloat(5.0);

...

How to check for an active internet connection? (iPhone, xCode)

2011-11-18T05:14:00.000-08:00

add the SystemConfiguration.framework to your project
download and add the files Reachability.h and Reachability.m

+(Boolean)isConnectionAvailable{
    Boolean ret = FALSE;

    Reachability *r = [Reachability reachabilityWithHostName:@"www.google.com"];
    NetworkStatus internetStatus = [r currentReachabilityStatus];

    if ((internetStatus == ReachableViaWiFi) || (internetStatus == ReachableViaWWAN)){
        ret = TRUE;
    }

    return ret;
}

How to add JSON support to WSO2 WSAS

2011-11-15T05:58:00.000-08:00

You need to follow the following steps in order to have JSON support in WSAS:

1. Get the axis2-json jar and drop it into $WSAS_HOME/webapps/ROOT/WEB-INF/plugins/

2. Get the Jettison jar (Latest is 1.0.1) and drop it into $WSAS_HOME/webapps/ROOT/WEB-INF/plugins/

Note : These jars need to be OSGI bundle jars. For simplicity I have attached OSGI bundles of this jars to this article. Please refer "How to build OSGi bundles using Maven Bundle Plugin" for details on how a OSGI bundle could be created from a jar.

3. You need to make the underlining engine (Axis2) aware of the JSON related message builders. Add the following message builders to the messageBuilders section in the axis2.xml (found in $WSAS_HOME/conf/axis2.xml)

<messageBuilder contentType="application/json" class="org.apache.axis2.json.JSONOMBuilder"/>
<messageBuilder contentType="application/json/badgerfish" class="org.apache.axis2.json.JSONBadgerfishOMBuilder"/>
<messageBuilder contentType="text/javascript" class="org.apache.axis2.json.JSONOMBuilder"/>

4. You need to make the underlining engine (Axis2) aware of the JSON related Message Formatters. Add the following Message Formatters to the messageFormatters section in the axis2.xml which could be found in $WSAS_HOME/conf/axis2.xml

<messageFormatter contentType="application/json" class="org.apache.axis2.json.JSONMessageFormatter"/>
<messageFormatter contentType="application/json/badgerfish" class="org.apache.axis2.json.JSONBadgerfishMessageFormatter"/>
<messageFormatter contentType="text/javascript" class="org.apache.axis2.json.JSONMessageFormatter"/>

(found here)

Writing Better HTML & CSS

2011-11-11T05:05:00.000-08:00

Writing Better HTML & CSS (Slides from FOWA London)

by: Chris Coyier

Batman lives

2011-11-11T03:07:00.000-08:00

Convert ms timestamp to NSString date

2011-11-11T00:07:00.000-08:00

[NSDate dateWithTimeIntervalSince1970:(ms / 1000)];

ms holds the number of milliseconds since unix epoch in an integer or long.

Get timestamp from actual date

2011-11-09T01:12:00.000-08:00

To get timestamp in milliseconds for actual date you can use:

new Date().getTime()

System.currentTimeMillis()

Hide soft keyboard in webapps

2011-10-28T06:32:00.000-07:00

In my project (App for iPhone with Dojo and PhoneGap) i had following situation:

i set focus to a textbox and tap my text.
As next i touch list item. This cause the movement from view1 to view2. The keyboard is still displayed. (note: i have´t pressed "Done"-Button)!

touch on first element set up movement from view1 (top) to view2 (bottom)

The cause for this is that the textbox have´t lose focus. For resolve this you must only set up the event for losing focus. And this event is ... blur ... :)

dojo.byId("searchField").blur();

document.getElementById("searchField").blur();

Enables or disables automatic detection of possible phone numbers in a webpage in Safari on iOS.

2011-10-28T05:50:00.000-07:00

In my project (App for iPhone with Dojo and PhoneGap) some numerical sequences saw as html links.

The cause for this is that Safari detect automatically some numerical sequences as possible phone number. You can cotrol this with following MetaTag:

<meta name="format-detection" content="telephone=no">

More MetaTags for Safari you can find here!

Hibernate HQL: Get n random rows

2011-10-26T01:43:00.000-07:00

Example:

List<Company> cCompany = session.createQuery(

    "from Company company " +

    "where company.companyIsActive =:companyIsActive " + 

    "order by rand()")

    .setBoolean("companyIsActive", true)

    .setMaxResults(10)

    .list();

How to load JavaScript after pageload?

2011-10-06T06:28:00.000-07:00

For loading JavaScript after pageload, you must:

create a "script" element

var el = document.createElement(“script”);

set source and type

el.src = “somefile.js”;
el.type=”text/javascript”;

and append it to "head"

document.getElementsByTagName(“head”)[0].appendChild(el);

Hibernate: org.hibernate.LazyInitializationException: failed to lazily initialize a collection

2011-09-30T04:03:00.000-07:00

This problem was caused by @OneToMany association.
Solution in my case:

@OneToMany(cascade=javax.persistence.CascadeType.ALL, fetch=FetchType.EAGER)

More useful information with good examples you will find on jboss.org

Random Generator for Javascript

2011-09-27T02:46:00.000-07:00

This random generator return a mix-value between numbers and letters. Optional you can give the length of return value.

function RandomGenerator(retLenght){
    var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    var returnValue = "";
    var rl = (retLenght == null) ? chars.length : retLenght;

    for(var i = 0; i < rl; i++){
        var index = Math.floor(Math.random() * chars.length);
        returnValue += chars.substring(index, index+1);
    }
    return returnValue;
}

Realtime Webcam Sudoku Solver

2011-09-27T02:13:00.000-07:00

Realtime Webcam Sudoku Solver

Convert string to numbers (Float, Integer) in Javascript

2011-09-21T02:08:00.000-07:00

How can I convert strings to numbers in Javascript?

To convert a string to a number, you can use the Javascript functions

parseFloat (for conversion to a floating-point number)

syntax: parseFloat('string')

parseInteger (for string-to-integer conversion)

syntax: parseInt('string' [, base] )

Examples:

parseFloat('1.45kg')  // 1.45
parseFloat('77.3')    // 77.3
parseFloat('077.3')   // 77.3
parseFloat('0x77.3')  // 0
parseFloat('.3')      // 0.3
parseFloat('0.1e6')   // 100000

parseInt('123.45')  // 123
parseInt('77')      // 77
parseInt('077',10)  // 77
parseInt('77',8)    // 63  (= 7 + 7*8)
parseInt('077')     // 63  (= 7 + 7*8)
parseInt('77',16)   // 119 (= 7 + 7*16)
parseInt('0x77')    // 119 (= 7 + 7*16)
parseInt('099')     // 0 (9 is not an octal digit)
parseInt('99',8)    // NaN (0 in very old browsers e.g. MSIE 3.0)
parseInt('0.1e6')   // 0
parseInt('ZZ',36)   // 1295 (= 35 + 35*36)

MacOS X, Java and encoding problem

2011-09-14T03:24:00.000-07:00

Problem:

I have a client that's attempting to output Swedish text characters that he's

entered into my app's interface, to HTML documents.

Unfortunately the HTML encoding that is supported
<meta http-equiv="content-type" content="text/html;charset=ISO-8859-1">

is currently not transforming his native language charset correctly.

All of this is working fine on the PC. The PC Java environment outputs the data

in the correct encoding type so that it can be interpreted by the ISO-8859-1

enabled browser.

Solution:

Get to Java Preferences -> General -> Workspace and change Text file encoding to ISO-8859-1

Background:

The default character encoding in Java for Mac OS X is MacRoman. The default font encoding on some other platforms is ISO-Latin-1 or WinLatin-1; unlike MacRoman, these encodings are subsets of UTF-8. Programs that assume that filenames can be turned into UTF-8 by just turning a byte into a char will cause problems in Mac OS X.

The simplest way to work around this problem is to specify a font encoding explicitly rather than assuming one. Specifying a font encoding besides UTF-8 and UTF-16 is not recommended.

If you do not specify a font encoding explicitly, recognize that:

In the conversion from a Unicode subset to MacRoman you may lose information.
Filenames are not stored on disk in the default font encoding, but in UTF-8. Usually this isn’t a problem, because most files are handled in Java as java.io.Files, though it is good to be aware of.
Although filenames are stored on disk as UTF-8, they are stored decomposed. This means that certain characters—for example, e-acute (é)—are stored as two characters, “e”, followed by “´” (acute accent). The default HFS+ filesystem of Mac OS X enforces this behavior. SMB enforces composed Unicode characters. UFS and NFS do not specify whether filenames are stored composed or decomposed, so they can do either

--> found here

Null value was assigned to a property of primitive type setter of ... - HQL, Java

2011-09-09T02:16:00.000-07:00

The casue for this exception is that formulas may not have an unknown (null) value for primitive types. You must use an Object type (Integer, Boolean, etc.) which can be set to null. But int and boolean cannot.