Classic code for resizing an image

Resize image as SDK does

public static byte[] decodeSampledBitmapFromResource(String path, int reqWidth, int reqHeight) {

	// First decode with inJustDecodeBounds=true to check dimensions
	final BitmapFactory.Options options = new BitmapFactory.Options();
	options.inJustDecodeBounds = true;
	BitmapFactory.decodeFile(path, options);

	options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
	options.inJustDecodeBounds = false;
	Bitmap bitmap = BitmapFactory.decodeFile(path, options);

	ByteArrayOutputStream byteArrayBitmapStream = new ByteArrayOutputStream();
	bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayBitmapStream);
	return byteArrayBitmapStream.toByteArray();
}

public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
	
	final int height = options.outHeight;
	final int width = options.outWidth;
	int inSampleSize = 1;

	if (height > reqHeight || width > reqWidth) {

		final int halfHeight = height / 2;
		final int halfWidth = width / 2;

		// Calculate the largest inSampleSize value that is a power of 2 and keeps both
		// height and width larger than the requested height and width.
		while ((halfHeight / inSampleSize) > reqHeight
			&& (halfWidth / inSampleSize) > reqWidth) {
			inSampleSize *= 2;
		}
	}

	return inSampleSize;
}