Blackberry ListField with custom image to highlight and 3 strings in single row.

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This is the code in Blackberry ListField for showing multiple entries in a list. Each entry 3 distinct strings, with different fonts sizes. The entry is highlighted by using a custom colored image. User can highlight the list item and hit menu key to see the details about the highlighted entry as well.

package mypackage;

import java.util.Vector;

import net.rim.device.api.i18n.ResourceBundle;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.Color;
import net.rim.device.api.ui.DrawStyle;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.Font;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.MenuItem;
import net.rim.device.api.ui.XYRect;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.ListField;
import net.rim.device.api.ui.component.ListFieldCallback;
import net.rim.device.api.ui.component.Menu;
import net.rim.device.api.ui.component.Status;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.decor.BackgroundFactory;

/**
*
* @author swapnil.chaudhari Date:Jan 23, 2012
*/
public class TeamListScreen extends MainScreen implements ListFieldCallback,
FieldChangeListener {

// Two listFields, one to display the Girls, the other to display the
// Boys
private ListField _lfBoys;
private ListField _lfGirls;

private Person _selectedPerson = null; // Selected Person
private boolean _selectedPersonIsABoy = false;

// We display Data from these Vector
private Vector _listBoys = new Vector(5);
private Font[] _arrFonts = new Font[]{Font.getDefault().derive(Font.PLAIN, 11),
Font.getDefault().derive(Font.PLAIN, 14),
Font.getDefault().derive(Font.PLAIN, 20)};
private Vector _listGirls = new Vector(5);
//0x777bf85d25419768L
public static ResourceBundle _resources = ResourceBundle.getBundle(
0x777bf85d25419768L, "mypackage.resource");
private Bitmap _focusRow = Bitmap.getBitmapResource(_resources.getString(resourceResource.focus_image));
// In this case we populate the Vectors with
// our own data, normally of course this
// data would be supplied to us

private MenuItem _displayPersonMenu = new MenuItem("Display", 110, 10) {
public void run() {
if (_selectedPerson != null) {
String name = _selectedPerson._firstName + " "
+ _selectedPerson._initial
+ " "
+ _selectedPerson._lastName;
if (_selectedPersonIsABoy) {
name = name + " is a Boy";
} else {
name = name + " is a Girl";
}
Status.show(name);
}
}
};

public TeamListScreen() {
// Set up Dummy Data

/*
* _listBoys.addElement(new Person("Fred", "F", "Flintstone"));
* _listBoys.addElement(new Person("Andy", "IS", "Boring"));
* _listBoys.addElement(new Person("Peter", "IS", "Clever"));
*/
/*
* _listGirls.addElement(new Person("Joesphine", "R",
* "Bloggs")); _listGirls.addElement(new Person("Fredrica", "F",
* "Flintstone")); _listGirls.addElement(new Person("Paticia",
* "IS", "Clever"));
*/

this.setTitle("Team Players");
Manager manager = getMainManager();
manager.setBackground(BackgroundFactory.createSolidBackground(Color.BLACK));
ButtonField buttonField = new ButtonField(
"click to add new name",
ButtonField.CONSUME_CLICK);
buttonField.setChangeListener(this);
add(buttonField);
this.add(new LabelField("Boys"){
/* (non-Javadoc)
* @see net.rim.device.api.ui.component.LabelField#paint(net.rim.device.api.ui.Graphics)
*/
protected void paint(Graphics graphics) {
graphics.setColor(Color.WHITE);
super.paint(graphics);
}
});
_lfBoys = new ListField(_listBoys.size()) {

protected void drawFocus(Graphics graphics, boolean on) {
// get the focus rect area
XYRect focusRect = new XYRect();
getFocusRect(focusRect);

boolean oldDrawStyleFocus = graphics
.isDrawingStyleSet(Graphics.DRAWSTYLE_FOCUS);
try {
if (on) {
// set the style so the fields in the row will update its color accordingly
graphics.setDrawingStyle(Graphics.DRAWSTYLE_FOCUS,true);
int oldColour = graphics.getColor();
try{
if(_focusRow.getWidth()< getWidth() || _focusRow.getHeight()<getRowHeight()){
Bitmap blank = new Bitmap(getWidth(), getRowHeight());
_focusRow.scaleInto(blank, Bitmap.FILTER_BILINEAR);
_focusRow = blank;
}
graphics.drawBitmap(focusRect.x, focusRect.y, focusRect.width,
focusRect.height, _focusRow, 0, 0);
// set the color and draw the color
/*graphics.setColor(Color.ORANGERED);
graphics.fillRect(
focusRect.x,
focusRect.y,
focusRect.width,
focusRect.height);*/
} finally {
graphics.setColor(oldColour);
}
// to draw the row again
drawListRow(this,
graphics,
getSelectedIndex(),
focusRect.y,
focusRect.width);
}

} finally {
graphics.setDrawingStyle(
Graphics.DRAWSTYLE_FOCUS,
oldDrawStyleFocus);
}
}
};
int height=0;
for(int i=0;i<_arrFonts.length;i++){
height = height + _arrFonts[i].getHeight()+3;
}
height = height + 3;
_lfBoys.setEmptyString(null,DrawStyle.HCENTER);
_lfBoys.setRowHeight(height);
_lfBoys.setBackground(BackgroundFactory.createSolidBackground(Color.BLACK));
//following line takes height of row as 3 times height of font
//_lfBoys.setRowHeight(-3);
_lfBoys.setCallback(this); // We manage the interaction!
this.add(_lfBoys);

/*
* this.add(new LabelField("Girls")); _lfGirls = new
* ListField(_listGirls.size()); _lfGirls.setCallback(this); //
* We manage the interaction! this.add(_lfGirls);
*/

}

protected boolean onSavePrompt() {
return true;
}

protected void makeMenu(Menu menu, int instance) {
// Which List item is selcted?
_selectedPerson = null; // Not sure which is focused atm.
Field focusingOn = this.getLeafFieldWithFocus();
if (focusingOn == _lfBoys) {
_selectedPersonIsABoy = true;
_selectedPerson = (Person) this.get(_lfBoys,
_lfBoys.getSelectedIndex());
}
if (focusingOn == _lfGirls) {
_selectedPersonIsABoy = false;
_selectedPerson = (Person) this.get(_lfGirls,
_lfGirls.getSelectedIndex());
}
menu.add(_displayPersonMenu);
}

// Implemented Call Back Methods follow

// draw the curent row
public void drawListRow(ListField list, Graphics g, int index, int y,
int w) {
try {
if (index >= 0) {
//color used to draw the list strings
int drawColor = Color.GRAY;
g.setColor(drawColor);
g.drawLine(0, y, w, y);
drawColor = Color.WHITE;
g.setColor(drawColor);
Person personToDraw = (Person) this.get(list,
index);
g.setFont(_arrFonts[0]);
y=y+3;
g.drawText(personToDraw._firstName + " "
+ personToDraw._lastName, 0, y,
0, w);
y=y+_arrFonts[0].getHeight()+3;
g.setFont(_arrFonts[1]);
g.drawText(personToDraw._firstName, 0,y);
y=y+_arrFonts[1].getHeight()+3;
g.setFont(_arrFonts[2]);
g.drawText(personToDraw._lastName, 0, y );
}
} catch (Exception e) {
}
}

/*
* (non-Javadoc)
*
* @see
* net.rim.device.api.ui.Field#drawFocus(net.rim.device.api.ui.Graphics,
* boolean)
*/

// get the selected index from the correct Vector
public Object get(ListField list, int index) {
if (list == _lfBoys) {
return _listBoys.elementAt(index);
} else {
return _listGirls.elementAt(index);
}
}

public int getPreferredWidth(ListField list) {
return Display.getWidth();
}

public int indexOfList(ListField listField, String prefix, int start) {
// Not a correct implementation - this is really just commented
// out
return start;
}

// This is the class which describes the data we will be displaying
class Person {
// In this example, to save accessors, the names are public
public String _firstName = null;
public String _lastName = null;
public String _initial = null;

public Person(String firstName, String initial, String lastName) {
_firstName = firstName;
_initial = initial;
_lastName = lastName;
}
}

private int lastAddedIndex = 0;

/*
* (non-Javadoc)
*
* @see
* net.rim.device.api.ui.FieldChangeListener#fieldChanged(net.rim.device
* .api.ui.Field, int)
*/
public void fieldChanged(Field field, int context) {
_listBoys.addElement(new Person("Joe" + lastAddedIndex, "R"
+ lastAddedIndex, "Bloggs" + lastAddedIndex));
lastAddedIndex++;
long time = System.currentTimeMillis();
_lfBoys.setSize(lastAddedIndex, 0);
_lfBoys.invalidate();
time = System.currentTimeMillis() - time;
System.out.println("Swapnil:" + time);
}

}

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