Custom PopUp to work like tooltip without time out - blackberry

Question

I need to create a Customised PopUp to work like a ToolTip How can i achieve it
i have worked on a code please check out and tell me where i need improvement
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.PopupScreen;
import net.rim.device.api.ui.container.VerticalFieldManager;
public class ToolTip extends PopupScreen{
private static VerticalFieldManager vfm;
private LabelField lbl;
private int xPosition;
private int yPosition;
private String message;
public ToolTip(String message,int xPos,int yPos){
super(vfm);
this.xPosition=xPos;
this.yPosition=yPos;
this.message=message;
vfm=new VerticalFieldManager(){
protected void paint(Graphics graphics) {
graphics.setColor(0x00FFFFFF);
graphics.fillRect(0,0,getWidth(),getHeight());
graphics.setColor(0x00000000);
graphics.drawRect(0,0,getWidth(),getHeight());
super.paint(graphics);
}
};
lbl=new LabelField(message);
vfm.add(lbl);
}
protected void sublayout(int width, int height) {
super.sublayout(width, height);
setExtent(lbl.getPreferredWidth(), lbl.getPreferredHeight());
setPosition(xPosition, yPosition);
}
}
i get an error of NullPointer Exception at super(vfm) because vfm is null when i use it as follows . How can i optimise my code .
ButtonField bf1=new ButtonField("Login"){
protected boolean navigationClick(int status, int time) {
UiApplication.getUiApplication().pushScreen(new ToolTip("Hello ", 50, 50));
return super.navigationClick(status, time);
}
};
add(bf1);

Answer 1

Pass an initialized instance of VerticalFieldManager to super(..) of PopupScreen. Check following code.
class ToolTip extends PopupScreen {
private static VerticalFieldManager vfm = new VerticalFieldManager() {
protected void paint(Graphics graphics) {
graphics.setColor(0x00FFFFFF);
graphics.fillRect(0, 0, getWidth(), getHeight());
graphics.setColor(0x00000000);
graphics.drawRect(0, 0, getWidth(), getHeight());
super.paint(graphics);
}
};
// other codes
public ToolTip(String message, int xPos, int yPos) {
super(vfm);
// other codes
}
protected void sublayout(int width, int height) {
// other codes
}
}
Updated code for custom background support
class ToolTip extends PopupScreen {
private int xPosition;
private int yPosition;
public ToolTip(String message, int xPos, int yPos) {
super(new VerticalFieldManager());
// Define and set background here
// Use - BackgroundFactory.createBitmapBackground(bitmap) for bitmap background
getDelegate().setBackground(BackgroundFactory.createSolidBackground(Color.RED));
// Add other UI Field here
this.xPosition=xPos;
this.yPosition=yPos;
add(new LabelField(message));
// other codes
}
// Empty implementation of this will disable default rounded border.
protected void applyTheme() {
}
protected void sublayout(int width, int height) {
super.sublayout(width, height);
setPosition(xPosition, yPosition);
}
}
You need to use getDelegate().setBackground(..) to set the background. Check the class BackgroundFactory for creating custom background.