SW Dev. Notes

Tuesday, 10 January 2012

Split method, for java and j2me and android

public Vector split(String stringToBeSplitted, String delimiter) {

Vector vector = new Vector();

StringBuffer sb = new StringBuffer();

int delimiterIndex = stringToBeSplitted.indexOf(delimiter), delemitterLength = delimiter

.length();

if (delimiterIndex != -1) {

while (delimiterIndex != -1) {

sb.append(stringToBeSplitted.substring(0, delimiterIndex));

stringToBeSplitted = stringToBeSplitted.substring(sb.length()

+ delemitterLength, stringToBeSplitted.length());

vector.addElement(sb.toString());

// System.out.println(sb.toString());

sb.delete(0, sb.length());

delimiterIndex = stringToBeSplitted.indexOf(delimiter);

}

vector.addElement(stringToBeSplitted);

// System.out.println((String)vector.elementAt((vector.size()-1)));

} else {

vector.addElement(stringToBeSplitted);

}

sb = null;

stringToBeSplitted = null;

delimiter = null;

delemitterLength = 0;

delimiterIndex = 0;

return vector;

}

Mohammad Abu Hmead

Send text to servlet and get response code from servlet

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.io.*;
import java.io.*;
import java.util.Vector;

public class MidletServlet extends MIDlet implements CommandListener {
    Display display = null;
    Form form = null;
    TextField tb = null;
    String str = null;
    String url = "http://localhost:8080/servlets-examples/servlet/getText";
    Command backCommand = new Command("Back", Command.BACK, 0);
    Command submitCommand = new Command("Submit", Command.OK, 2);
    Command exitCommand = new Command("Exit", Command.STOP, 3);
    private Test test;
    
    public MidletServlet() {}
    
    public void startApp() throws MIDletStateChangeException {
        display = Display.getDisplay(this);
        form = new Form("Request Servlet");
        tb = new TextField("Please input text: ","",30,TextField.ANY );
        form.append(tb);
        form.addCommand(submitCommand);
        form.addCommand(exitCommand);
        form.setCommandListener(this);
        display.setCurrent(form);
    }
    
    public void pauseApp() {}
    
    public void destroyApp(boolean unconditional) {}
    
    public void commandAction(Command c, Displayable d) {
        if (c == exitCommand) {
            destroyApp(true);
            notifyDestroyed();
        } else if (c == backCommand) {
            display.setCurrent(form);
        } else if (c == submitCommand) {
            str = tb.getString();
            test  = new Test(this);
            test.start();
            test.getServlet(str);
        }
    }
    
    
    class Test implements Runnable {
        MidletServlet midlet;
        private Display display;
        String text;
        
        public Test(MidletServlet midlet) {
            this.midlet = midlet;
            display = Display.getDisplay(midlet);
        }
        
        public void start() {
            Thread t = new Thread(this);
            t.start();
        }
        
        public void run() {
            StringBuffer sb = new StringBuffer();
            try {
                HttpConnection c = (HttpConnection) Connector.open(url);
                c.setRequestProperty(
                  "User-Agent","Profile/MIDP-1.0, Configuration/CLDC-1.0");
                
                c.setRequestProperty("Content-Language","en-US");
                c.setRequestMethod(HttpConnection.POST);
                
                DataOutputStream os = 
                        (DataOutputStream)c.openDataOutputStream();
                
                os.writeUTF(text.trim());
                os.flush();
                os.close();
                
                // Get the response from the servlet page.
                DataInputStream is =(DataInputStream)c.openDataInputStream();
                //is = c.openInputStream();
                int ch;
                sb = new StringBuffer();
                while ((ch = is.read()) != -1) {
                    sb.append((char)ch);
                }
                showAlert(sb.toString());
                is.close();
                c.close();
            } catch (Exception e) {
                showAlert(e.getMessage());
            }
        }
                /* This method takes input from user like text and pass
                to servlet */
        public void getServlet(String text) {
            this.text = text;
        }
        
        /* Display Error On screen*/
        private void showAlert(String err) {
            Alert a = new Alert("");
            a.setString(err);
            a.setTimeout(Alert.FOREVER);
            display.setCurrent(a);
        }
    };
}

import java.io.*;
import java.text.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class getText extends HttpServlet {
    
    public void init() {
    }
    
    public void doPost(HttpServletRequest request, 
            HttpServletResponse response) throws ServletException, 
            IOException {
        
        DataInputStream in = 
                new DataInputStream((InputStream)request.getInputStream());
        
        String text = in.readUTF();
        String message;
        try {
            message = "100 ok";
        } catch (Throwable t) {
            message = "200 " + t.toString();
        }
        response.setContentType("text/plain");
        response.setContentLength(message.length());
        PrintWriter out = response.getWriter();
        out.println(message);
        in.close();
        out.close();
        out.flush();
    }
    
    public void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, 
            IOException {
        
        doPost(request,response);
    }
}


Mohammad Abu Hmead
10.01.2012 11:08 AM

Send text to servlet and get response code from servlet

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.io.*;
import java.io.*;
import java.util.Vector;

public class MidletServlet extends MIDlet implements CommandListener {
    Display display = null;
    Form form = null;
    TextField tb = null;
    String str = null;
    String url = "http://localhost:8080/servlets-examples/servlet/getText";
    Command backCommand = new Command("Back", Command.BACK, 0);
    Command submitCommand = new Command("Submit", Command.OK, 2);
    Command exitCommand = new Command("Exit", Command.STOP, 3);
    private Test test;
    
    public MidletServlet() {}
    
    public void startApp() throws MIDletStateChangeException {
        display = Display.getDisplay(this);
        form = new Form("Request Servlet");
        tb = new TextField("Please input text: ","",30,TextField.ANY );
        form.append(tb);
        form.addCommand(submitCommand);
        form.addCommand(exitCommand);
        form.setCommandListener(this);
        display.setCurrent(form);
    }
    
    public void pauseApp() {}
    
    public void destroyApp(boolean unconditional) {}
    
    public void commandAction(Command c, Displayable d) {
        if (c == exitCommand) {
            destroyApp(true);
            notifyDestroyed();
        } else if (c == backCommand) {
            display.setCurrent(form);
        } else if (c == submitCommand) {
            str = tb.getString();
            test  = new Test(this);
            test.start();
            test.getServlet(str);
        }
    }
    
    
    class Test implements Runnable {
        MidletServlet midlet;
        private Display display;
        String text;
        
        public Test(MidletServlet midlet) {
            this.midlet = midlet;
            display = Display.getDisplay(midlet);
        }
        
        public void start() {
            Thread t = new Thread(this);
            t.start();
        }
        
        public void run() {
            StringBuffer sb = new StringBuffer();
            try {
                HttpConnection c = (HttpConnection) Connector.open(url);
                c.setRequestProperty(
                  "User-Agent","Profile/MIDP-1.0, Configuration/CLDC-1.0");
                
                c.setRequestProperty("Content-Language","en-US");
                c.setRequestMethod(HttpConnection.POST);
                
                DataOutputStream os = 
                        (DataOutputStream)c.openDataOutputStream();
                
                os.writeUTF(text.trim());
                os.flush();
                os.close();
                
                // Get the response from the servlet page.
                DataInputStream is =(DataInputStream)c.openDataInputStream();
                //is = c.openInputStream();
                int ch;
                sb = new StringBuffer();
                while ((ch = is.read()) != -1) {
                    sb.append((char)ch);
                }
                showAlert(sb.toString());
                is.close();
                c.close();
            } catch (Exception e) {
                showAlert(e.getMessage());
            }
        }
                /* This method takes input from user like text and pass
                to servlet */
        public void getServlet(String text) {
            this.text = text;
        }
        
        /* Display Error On screen*/
        private void showAlert(String err) {
            Alert a = new Alert("");
            a.setString(err);
            a.setTimeout(Alert.FOREVER);
            display.setCurrent(a);
        }
    };
}

import java.io.*;
import java.text.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class getText extends HttpServlet {
    
    public void init() {
    }
    
    public void doPost(HttpServletRequest request, 
            HttpServletResponse response) throws ServletException, 
            IOException {
        
        DataInputStream in = 
                new DataInputStream((InputStream)request.getInputStream());
        
        String text = in.readUTF();
        String message;
        try {
            message = "100 ok";
        } catch (Throwable t) {
            message = "200 " + t.toString();
        }
        response.setContentType("text/plain");
        response.setContentLength(message.length());
        PrintWriter out = response.getWriter();
        out.println(message);
        in.close();
        out.close();
        out.flush();
    }
    
    public void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, 
            IOException {
        
        doPost(request,response);
    }
}


Mohammad Abu Hmead
10.01.2012 11:08 AM

Wednesday, 4 January 2012

How to avoid ListView with Black blackground on mouse drag

to avoid ListView with Black blackground on mouse drag

use this in xml file android:cacheColorHint="#00000000"

Mohammad Abu Hmead

Monday, 19 December 2011

Why Android Layout file opened as XML?

When I'm trying to open Android Layout File(Double Click on it), it opened as XML file, so, why?

The reason is android SDK sometime make the developer crazy with some bugs like this" Opening layout file as XML and design instead of Graphical Layout"

The solution is:

Right Click on the Layout file -> Open with -> Android Layout Editor

Mohammad Abu Hmead

Open android xml layout

When I'm trying to open Android Layout File(Double Click on it), it opened as XML file, so, why?

The reason is android SDK sometime make the developer crazy with some bugs like this" Opening layout file as XML and design instead of Graphical Layout"

The solution is:
Right Click on the Layout file -> Open with -> Android Layout Editor

Sunday, 18 December 2011

Error within Debug UI: java.lang.reflect.InvocationTargetException

I this is a popup dialog contains this error "Error within Debug UI: java.lang.reflect.InvocationTargetException",
I googled it, but I didn't found the solution.

I tried to delete the Project from the Projects Work space, and I reimported it, it worked fine.
so, the easiest solution is
"Delete the Project from the work space, Reimport it again to the work space"
The result: it will work 100%

Mohammad Abu Hmead