Pie Graph in BlackBerry , Android and J2ME

1) Define array of data and array of colors.

int[] data = { 16, 14, 16, 10, 4 };

int colors[] = { Color.RED , Color.LIGHTBLUE ,Color.YELLOW, Color.GREEN,Color.BLUE};

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2) Other parameters

int width = 200; // width of area where pie graph is drawn.

int height = 200; //height of area where pie graph is drawn.

int sum = 0;

   

int deltaAngle ;

int x = 0; //starting point where area of pie graph drawn (you can change this as per your choice)

int y = 0; //

int diameter;

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3)Calculation

 sum = 0;

    for (int i = 0; i < data.length; i++) {

      sum += data[i];

    }

    deltaAngle = 360 * 100 / sum / 100;

   

    if (width > height)

      diameter = height - y * 2;

    else

      diameter = width - x * 2;

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4)Paint function

protected void paint(Graphics graphics) {

    graphics.setColor(Color.BLACK);

    graphics.fillRect(0, 0, width, height);

    graphics.clear();

   

    int startAngle = 0;

    for (int i = 0; i < data.length; i++) 

   {

      graphics.setColor(colors[i]);

      graphics.fillArc(x, y, diameter, diameter, startAngle, deltaAngle * data[i]);

      startAngle += deltaAngle * data[i];

     

    }

 

}

How To - Create tabbed view screens

http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800505/800508/How_To_-_Create_tabbed_view_screens.html?nodeid=1357482&vernum=0

Convert Vector to String Array in Java

        Vector v = new Vector();

         v.add("1");

         v.add("2");

         v.add("3");

         v.add("4");

        String[] s = String[v.size];

        

       for(int i = 0 ; i < g.v.size() ; i++){

             s[i] = (String) g.v.elementAt(i);

        }

..............................

OutPut String Array 

s[] = {"1","2","3","4"};