Scaling a bitmap to height and width of sceen

Question

I have a bitmap image that is larger than then screen size. I want to scale the image in pixels down to the screen size ? How can i do this ? I want to scale it maintaining aspect ratio not just resize it ?

Kind Regards

did u tried scaletype:fitxy? property – KOTIOS Aug 16 '13 at 06:59 — KOTIOS, Aug 16 '13 at 06:59
No i want to scale it programetically – user1730789 Aug 16 '13 at 07:01 — user1730789, Aug 16 '13 at 07:01
yup that can be appyied programtically also – KOTIOS Aug 16 '13 at 07:02 — KOTIOS, Aug 16 '13 at 07:02

score 0 · Answer 1 · edited May 23 '17 at 11:49

use this function with argument as screenWidth and screenHeight

public Bitmap scaleCenterCrop(Bitmap source, int newHeight, int newWidth) {
int sourceWidth = source.getWidth();
int sourceHeight = source.getHeight();

// Compute the scaling factors to fit the new height and width, respectively.
// To cover the final image, the final scaling will be the bigger 
// of these two.
float xScale = (float) newWidth / sourceWidth;
float yScale = (float) newHeight / sourceHeight;
float scale = Math.max(xScale, yScale);

// Now get the size of the source bitmap when scaled
float scaledWidth = scale * sourceWidth;
float scaledHeight = scale * sourceHeight;

// Let's find out the upper left coordinates if the scaled bitmap
// should be centered in the new size give by the parameters
float left = (newWidth - scaledWidth) / 2;
float top = (newHeight - scaledHeight) / 2;

// The target rectangle for the new, scaled version of the source bitmap will now
// be
RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);

// Finally, we create a new bitmap of the specified size and draw our new,
// scaled bitmap onto it.
Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, source.getConfig());
Canvas canvas = new Canvas(dest);
canvas.drawBitmap(source, null, targetRect, null);

return dest;
}

for how to get screen width and height see this

how do i get the screen width and screen height ? – user1730789 Aug 16 '13 at 07:19 — user1730789, Aug 16 '13 at 07:19

score 0 · Answer 2 · answered Aug 16 '13 at 07:08

0

Get the screen size and pass those parameters into the following function :

Bitmap.createScaledBitmap(originalimage, width, height, true);

answered Aug 16 '13 at 07:08

Exceptional

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this will give outOfMemoryError while we have high resolution image. – Sanket Kachhela Aug 16 '13 at 07:11
try to compress the image, then. – Exceptional Aug 16 '13 at 07:17
where u fetch the image from? – Exceptional Aug 16 '13 at 07:30

Scaling a bitmap to height and width of sceen

2 Answers2