Don't allow application to go back

Just add following code to your Screen class:

public boolean onClose() {

return false;

}

Resize header dynamically based on Display width

We need to prepare 3 images:

public class HeaderManager extends HorizontalFieldManager {

public HeaderManager() {

super(Manager.NO_HORIZONTAL_SCROLL | Manager.NO_VERTICAL_SCROLL | Manager.USE_ALL_WIDTH | Manager.FIELD_RIGHT);

this.setBackground(BackgroundFactory.createSolidBackground(Color.RED));

Bitmap image;

Bitmap leftImage = Bitmap.getBitmapResource("header_left.png");

this.add(new BitmapField(leftImage));

image = Bitmap.getBitmapResource("header_middle.png");

Bitmap rightImage = Bitmap.getBitmapResource("header_right.png");

this.add(new BitmapField(resizeBitmap(image, Display.getWidth() - leftImage.getWidth() - rightImage.getWidth(), image.getHeight())));

VerticalFieldManager vert = new VerticalFieldManager(Manager.NO_HORIZONTAL_SCROLL | Manager.NO_VERTICAL_SCROLL | Manager.USE_ALL_WIDTH | Manager.FIELD_RIGHT);

vert.add(new BitmapField(rightImage, Field.FIELD_RIGHT));

this.add(vert);

}

public static Bitmap resizeBitmap(Bitmap image, int width, int height) {

int imageWidth = image.getWidth();

int imageHeight = image.getHeight();

// Need an array (for RGB, with the size of original image)

int rgb[] = new int[imageWidth * imageHeight];

// Get the RGB array of image into "rgb"

image.getARGB(rgb, 0, imageWidth, 0, 0, imageWidth, imageHeight);

// Call to our function and obtain rgb2

int rgb2[] = rescaleArray(rgb, imageWidth, imageHeight, width, height);

// Create an image with that RGB array

Bitmap temp2 = new Bitmap(width, height);

temp2.setARGB(rgb2, 0, width, 0, 0, width, height);

return temp2;

}

private static int[] rescaleArray(int[] ini, int x, int y, int x2, int y2) {

int out[] = new int[x2 * y2];

for (int yy = 0; yy <>

int dy = yy * y / y2;

for (int xx = 0; xx <>

int dx = xx * x / x2;

out[(x2 * yy) + xx] = ini[(x * dy) + dx];

}

}

return out;

}

}

Resize bitmap

public static Bitmap resizeBitmap(Bitmap image, int width, int height) {

int imageWidth = image.getWidth();

int imageHeight = image.getHeight();

// Need an array (for RGB, with the size of original image)

int rgb[] = new int[imageWidth * imageHeight];

// Get the RGB array of image into "rgb"

image.getARGB(rgb, 0, imageWidth, 0, 0, imageWidth, imageHeight);

// Call to our function and obtain rgb2

int rgb2[] = rescaleArray(rgb, imageWidth, imageHeight, width, height);

// Create an image with that RGB array

Bitmap temp2 = new Bitmap(width, height);

temp2.setARGB(rgb2, 0, width, 0, 0, width, height);

return temp2;

}

private static int[] rescaleArray(int[] ini, int x, int y, int x2, int y2) {

int out[] = new int[x2 * y2];

for (int yy = 0; yy <>

int dy = yy * y / y2;

for (int xx = 0; xx <>

int dx = xx * x / x2;

out[(x2 * yy) + xx] = ini[(x * dy) + dx];

}

}

return out;

}

Remove "Changes Made!" message when hitting back button

To get rid following dialog:


Put following code inside Screen class:

public boolean onClose(){

setDirty(false);

return super.onClose();

}

Go to previous screen(s)

//We have screens A -> B -> C

//Current screen is C

//Go to previous screen (B)

UiApplication.getUiApplication().popScreen(this);

//Go to screen A

UiApplication.getUiApplication().popScreen(UiApplication.getUiApplication().getActiveScreen());

Show alert in blackberry

protected static void showError(final String message) {

UiApplication.getUiApplication().invokeLater(new Runnable() {

public void run() {

Dialog.alert(message);

}

});

}