lwuit | j2me link control (component)

Here is an implemantation of a LINK component for the LWUIT enviroment under J2ME (Java ME).
This code creates a lwuit link component based on the lwuit button which not have a border and is transparent! also have an appropriate color (blue) and font style (underline).
hope it is helpful:

code example:

Button btn = new Button("LINK1");
//btn.getStyle().setBorder(Border.createEmpty());
btn.getUnselectedStyle().setBorder(Border.createEmpty());
btn.getSelectedStyle().setBorder(Border.createEmpty());

//btn.getStyle().setBgTransparency(100);
btn.getUnselectedStyle().setBgTransparency(100);
btn.getSelectedStyle().setBgTransparency(100);

//btn.getStyle().setFont(Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_UNDERLINED, Font.SIZE_MEDIUM));
btn.getUnselectedStyle().setFont(Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_UNDERLINED, Font.SIZE_MEDIUM));
btn.getSelectedStyle().setFont(Font.createSystemFont(Font.FACE_SYSTEM, Font.STYLE_UNDERLINED | Font.STYLE_BOLD, Font.SIZE_MEDIUM));

//btn.getStyle().setFgColor(0x0000ff);
btn.getUnselectedStyle().setFgColor(0x0000ff);
btn.getSelectedStyle().setFgColor(0x0000ff);

Enjoy!

J2ME | read BlackBerry device name, device id (under MIDP)

Hello to all.

I searched the web and not found any implemantaion of reading device name or device id using J2ME MIDP for blackberry.

There exists an RIM api: "net.rim.device.api.system.DeviceInfo.getDeviceName()" which allow you to read the blackberry device information, but on when creating a global application for all MIDP devices, this api will not work for other devices like Sony-Ericsson, NOKIA, Samsung, Motorola, HTC and so...

The solution is to dynamicly load an outer JAR (dynamic library = dll) only when a blackberry device detected and read all data.
NOTE: if we will access to this library (JAR) without validating the RIM device, an excaption will be thrown!!

So, the solution is:
Step 1:

Create a new project: Mobile Class Library.
Name it: BlackberryInfo

Step 2:

create new Class named: DeviceInfo
with the following code:

Code for step 2:

package BlackberryInfo;

public class DeviceInfo
{
   static public String getDeviceName()
   {
      return net.rim.device.api.system.DeviceInfo.getDeviceName();
   }

   static public String getManufacturerName()
   {
      return net.rim.device.api.system.DeviceInfo.getManufacturerName();
   }

   static public int getDeviceId()
   {
      return net.rim.device.api.system.DeviceInfo.getDeviceId();
   }

   static public String getPlatformVersion()
   {
      return net.rim.device.api.system.DeviceInfo.getPlatformVersion();
   }
}

Step 3:

Build project and get JAR and JAD named: BlackberryInfo.jar
Note: build this JAR using Blackberry BlackBerry JDE (I used 5.0.0) (BlackBerry JDE downloads)
if you want, i can upload this library to the blog...

Step 4:

In your application (J2ME MIDP), just add BlackberryInfo.jar as library.

Step 5:

Now, all you have to do, is just to validate that this is RIM Blackberry device, and the read all device info.

Code for step 5:

static public boolean isBlackberryPlatform()
{
    try
    {
        Class.forName("net.rim.blackberry.api.browser.Browser");
        return true;
    }
    catch (Exception ex)
    {
        return false;
    }
}

// some func for read device information (device name, device id, device
 if (isBlackberryPlatform() == true)
{
            System.out.println("Blackberry platform:");
            System.out.println(BlackberryInfo.DeviceInfo.getDeviceName());
            System.out.println(BlackberryInfo.DeviceInfo.getManufacturerName());
            System.out.println(BlackberryInfo.DeviceInfo.getPlatformVersion());
            System.out.println(BlackberryInfo.DeviceInfo.getDeviceId() + "");
}

Notice that, the JAR is loaded only when trying to access it, so other devices expect RIM blackberry will NOT get to this line so they won't try to load unavailable api of rim blackberry.

reference to DeviceInfo implemantation (5.0.0)
http://www.blackberry.com/developers/docs/5.0.0api/net/rim/device/api/system/DeviceInfo.html

hope i could help someone outthere...
p.s.
this method can work for every OUTER/UNKNOWN API in J2ME.

J2ME | determine BlackBerry device (OS)

Here is a code for determine whether a J2ME application is running over Blackberry device.

The idea is to check for a class that exists only in Blackberry platform and not on J2ME MIDP Operation system.
here I choose to determine using "net.rim.blackberry.api.browser.Browser" which exists only in Blackberry OS (NOT in other OSs).

The code using Class.forClass method (link) which returns the Class object associated with the class or interface with the given string name. if the class exists (so we in Blackberry) the method return an object, otherwise throws an exception.

here is a simple code:

static public boolean isBlackberryPlatform()
{
        try
        {
            Class.forName("net.rim.blackberry.api.browser.Browser");
            return true;
        }
        catch (Exception ex)
        {
            return false;
        }
}

enjoy, and post replies...

J2ME | identify MIDP runner over Android OS

Here is a good code for determine whether a J2ME application is running over MIDP runner over Android OS.

The idea is to check for a class that exists only in Android platform and not on J2ME MIDP Operaion system.
here I choose to determine using "android.Manifest" which exists in Android OS and NOT in other OSs.

The code using Class.forClass method (link) which returns the Class object associated with the class or interface with the given string name. if the class exists (so we in Android) the method return an object, otherwise throws an exception.

here is a simple code:

static public boolean isAndroidPlatform()
{
        try
        {
            Class.forName("android.Manifest");
            return true;
        }
        catch (Exception ex)
        {
            return false;
        }
}

enjoy, and post replies...

Asp.Net - check/validate cookies support

Here is a code for checking/validating that user device (browser) supports cookies. in other words this code checks if cookies are enabled on the browser.

Here the code implemented in the Login page:

    // Constants:
    protected const string QUERYSTRING_CHECK_COOKIE = "checkcookie";
    protected const string TEST_COOKIE_NAME = "check_cookie";
    protected const string TEST_COOKIE_VALUE = "ok";

    // On-load event, at page load:
    protected override void OnLoad(EventArgs p_eventArgs)
    {
        if (IsPostBack == false)
        {
            // Check if browser support cookies
            if (Request[QUERYSTRING_CHECK_COOKIE] == null)
            {
                // try to insert cookie:
                Response.Cookies.Add(new HttpCookie(TEST_COOKIE_NAME, TEST_COOKIE_VALUE));
                string newUrl = string.Format("Login.aspx?{1}=1", QUERYSTRING_CHECK_COOKIE);
                this.Redirect(newUrl, true);
                return;
            }
            else
            {
                // here, client sould contain test cookie:
                HttpCookie cookie = Request.Cookies[TEST_COOKIE_NAME];
                bool isCookieEnabled = cookie != null && cookie.Value == TEST_COOKIE_VALUE;
                if (isCookieEnabled == false)
                {
                    // cookies are disabled!!! show error message
                    Label1.Text = "Device NOT support Cookies!";
                    return;
                }
            }

        }
    }

You can implement this also in other pages than Login page.
:)

J2ME | Binary search algorithem

Binary search algorithem method/function for j2me platform.
Use is with sorted String array!!!
Enjoy... this works great with my example on J2ME | String array sort. link here.

public static int binarySearch(String[] p_arraySorted, String p_key)
{
return binarySearch(p_arraySorted, 0, p_arraySorted.length, p_key);
}

public static int binarySearch(String[] p_arraySorted, int p_first, int p_upto, String p_key)
{
int compare, mid;
while (p_first < p_upto)
{
// Compute mid point.
mid = (p_first + p_upto) / 2;

compare = p_key.compareTo(p_arraySorted[mid]);
if (compare < 0) // p_key < p_arraySorted[mid]
{
// repeat search in bottom half
p_upto = mid;
}
else if (compare > 0) // p_key > p_arraySorted[mid]
{
// Repeat search in top half
p_first = mid + 1;
}
else
{
// Found it. return position
return mid;
}
}

// Failed to find key
return -1;
}

Sort it and search it wisely...

J2ME | String array sort

Here is a good function for sorting string arrays.
The algorithem is BUBBLE-SORT algorithm.
The algorithem sorts the string array (dictionary comparison)

static void bubbleSort(String[] p_array) throws Exception
{
boolean anyCellSorted;
int length = p_array.length;
String tmp;
for (int i = length; --i >= 0;)
{
anyCellSorted = false;
for (int j = 0; j < i; j++)
{
if (p_array[j].compareTo(p_array[j + 1]) > 0)
{
tmp = p_array[j];
p_array[j] = p_array[j + 1];
p_array[j + 1] = tmp;
anyCellSorted = true;
}

}
if (anyCellSorted == false)
{
return;
}
}
}

if you want i will upload more SORT algorithems...

J2ME | String Replace method

I found a good string replace function/method.
J2ME do not contain string replace (only char replace),
so this method is very helpful!!!

public static String replace(String _text, String _searchStr, String _replacementStr) {
// String buffer to store str
StringBuffer sb = new StringBuffer();

// Search for search
int searchStringPos = _text.indexOf(_searchStr);
int startPos = 0;
int searchStringLength = _searchStr.length();

// Iterate to add string
while (searchStringPos != -1) {
sb.append(_text.substring(startPos, searchStringPos)).append(_replacementStr);
startPos = searchStringPos + searchStringLength;
searchStringPos = _text.indexOf(_searchStr, startPos);
}

// Create string
sb.append(_text.substring(startPos,_text.length()));

return sb.toString();
}

found at http://forums.sun.com/thread.jspa?threadID=734604&tstart=5431

Compact Framework | Scrolling on control

Scrolling inside a control from the code is very simple.
All you have to do is to give the control the new location (Point: x,y)
and it will scroll to the new point...

My generic method scrolls the item each time by ~66% of its size (2/3)
Note: in my example, the scrolling obect is this!

int changeHeight = this.Height * 2 / 3;
if (p_pressedKey == Keys.Down)
{
this.AutoScrollPosition = new Point(this.AutoScrollPosition.X, -this.AutoScrollPosition.Y + changeHeight);
}
else if (p_pressedKey == Keys.Up)
{
this.AutoScrollPosition = new Point(this.AutoScrollPosition.X, -this.AutoScrollPosition.Y - changeHeight);
}

Picture with transparent label

A picturebox object that supports a label (transparent).
this allow to create a piture button and add text it.
This control tested and working :)

use it with wisdom... or not:
have fun:

public class PictureText : PictureBox, ISupportInitialize
{
#region #region Private Data-Members

private string _textDisplayed = string.Empty;

private Font _textFont = new System.Drawing.Font("Arial", 10F, System.Drawing.FontStyle.Bold);

private Color _textForeColor = Color.Black;

#endregion

public string TextDisplayed
{
get { return _textDisplayed; }
set
{
_textDisplayed = value;
this.Invalidate();
}
}
public Font TextFont
{
get { return _textFont; }
set
{
_textFont = value;
this.Invalidate();
}
}
public Color TextForeColor
{
get { return _textForeColor; }
set
{
_textForeColor = value;
this.Invalidate();
}
}

//protected override void OnPaintBackground(PaintEventArgs e)
//{
// base.OnPaintBackground(e);

// //HorizontalAlignment.
// if (string.IsNullOrEmpty(TextDisplayed) == false)
// {
// e.Graphics.DrawString(this.TextDisplayed, this.TextFont, new SolidBrush(this.TextForeColor), this.Location.X, this.Location.Y);
// }
//}

protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);

if (string.IsNullOrEmpty(TextDisplayed) == false)
{
using (StringFormat sf = new StringFormat())
{
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;

e.Graphics.DrawString(this.TextDisplayed, this.TextFont, new SolidBrush(this.TextForeColor), this.Width / 2, this.Height / 2, sf);
}
}
}

#region ISupportInitialize Members
public void BeginInit()
{
}
public void EndInit()
{
}
#endregion
}

Validation Israel ID

try
{
string txtId = p_text.PadLeft(9, '0');

int sum = 0;
int[] arrIdDigits = new int[9];
for (int i = 0; i < arrIdDigits.Length; i++)
{
arrIdDigits[i] = int.Parse(p_text[i].ToString());

if (i % 2 != 0)
{
arrIdDigits[i] *= 2;
if (arrIdDigits[i] > 9)
{
arrIdDigits[i] = (arrIdDigits[i] % 10) + 1;
}
}

sum += arrIdDigits[i];
}

sum = (sum % 10);
if (sum == 0)
{
return true;
}
}
catch (Exception ex)
{
}

return false;

Making control RTL or LTR

As many people asked me for making rtl or ltr controls on the compactframework.

My best solution for this question is:

public const int GWL_EXSTYLE = (-20);
public const int WS_EX_LAYOUTRTL = 0x400000;
public static void SetControlDirection(Control c, bool p_isRTL)
{
int style = GetWindowLong(c.Handle, GWL_EXSTYLE);

// set default to ltr (clear rtl bit)
style &= ~WS_EX_LAYOUTRTL;

if (p_isRTL == true)
{
// rtl
style = WS_EX_LAYOUTRTL;
}

SetWindowLong(c.Handle, GWL_EXSTYLE, style);
c.Invalidate();
}


[DllImport("coredll.dll")]
static extern int GetWindowLong(IntPtr hWnd, int cmd);

[DllImport("coredll.dll")]
static extern IntPtr SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

CE OS supported:

I tried on "Windows Mobile 6 Classic" emulator and it worked. (CE OS = 5.2)

On "Windows Mobile 5.0 Pocket PC" emulator, also worked. (CE OS = 5.1)


On "Pocket PC 2003 SE" emulator, it did NOT worked! (CE OS = 4.21)




Download sample test





I hope it will be helpful for you... :)

Auto Sized Label for cf

Auto Sized Label control for the compact framework:

I noticed that there is no solution for an autosized label (auto width & height)

so i build my example for this control:

public class AutoSizeLabel : Label
{
public override string Text
{
get
{
return base.Text;
}
set
{
base.Text = value;
ReCalculateSize();
}
}
public override System.Drawing.Font Font
{
get
{
return base.Font;
}
set
{
base.Font = value;
ReCalculateSize();
}
}
private void ReCalculateSize()
{
using (Control control = new Control())
{
using (Graphics g = control.CreateGraphics())
{
SizeF size = g.MeasureString(base.Text, base.Font);
base.Width = (int)size.Width + 1;
base.Height = (int)size.Height + 1;
}
}
}
}

i hope it will help you...