Android image rotation

Question

I have chosen camera or gallery to take the image for upload. I have decode the image using the below code

 public static Bitmap decodeSampledBitmapFromFile(String path, int reqWidth, int reqHeight) { path = new File(path).getAbsolutePath(); // First decode with inJustDecodeBounds=true to check dimensions final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(path, options); // Calculate inSampleSize options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); // Decode bitmap with inSampleSize set options.inJustDecodeBounds = false; return BitmapFactory.decodeFile(path, options); } public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) { // Raw height and width of image 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; }

}

Now if this image took as horizontal view then I should change it as vertically. because of the receipt upload.

In my gallery image or taken image width > height I want to rotate the image to vertical view any suggestion for this??

AngelJanniee · Accepted Answer · 2017-04-28 03:11:49Z

This is the code I used it works for me,

 public Bitmap decodeFile(String filePath) { int imageOrientation = 10; ExifInterface ei; try { ei = new ExifInterface(filePath); imageOrientation = ei.getAttributeInt( ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); } catch (IOException e) { e.printStackTrace(); } // Decode image size BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; BitmapFactory.decodeFile(filePath, o); // The new size we want to scale to final int REQUIRED_SIZE = 1024; // Find the correct scale value. It should be the power of 2. int width_tmp = o.outWidth, height_tmp = o.outHeight; int scale = 1; while (true) { if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE) break; width_tmp /= 2; height_tmp /= 2; scale *= 2; } // Decode with inSampleSize BitmapFactory.Options o2 = new BitmapFactory.Options(); o2.inSampleSize = scale; bitMap = BitmapFactory.decodeFile(filePath, o2); switch (imageOrientation) { case ExifInterface.ORIENTATION_ROTATE_90: rotateImage(bitMap, 90); break; case ExifInterface.ORIENTATION_ROTATE_180: rotateImage(bitMap, 180); break; case ExifInterface.ORIENTATION_ROTATE_270: rotateImage(bitMap, 270); break; default: break; } return bitMap; }

This is the rotate method,

 public void rotateImage(Bitmap img, int degree) { Matrix matrix = new Matrix(); matrix.postRotate(degree); bitMap = Bitmap.createBitmap(img, 0, 0, img.getWidth(), img.getHeight(), matrix, true); }

yeah working for Galaxy 7 edge. but if I took horizontal view then can not able to rotate it to vertically...
You don't need to change that horizontal image to vertical. In my case if I take photo vertically and upload it has shown horizontally. That's what I fixed using this code.

Nadav Tasher · Accepted Answer · 2017-04-27 05:48:21Z

You can just set it in an ImageView and rotate the view 90 degrees to any direction you want it to be.

Sonal Bharwani · Accepted Answer · 2017-04-27 06:45:30Z

You need to use matrix for this as follows, it worked for me

  Matrix matrix = getRotation(context, Uri.fromFile(f)); b = Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), matrix, true);

And here is the getRotation() method

  public static Matrix getRotation(Context context, Uri selectedImage) { Matrix matrix = new Matrix(); ExifInterface exif; try { exif = new ExifInterface(selectedImage.getPath()); int orientation = exif.getAttributeInt( ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); Utility.log("orientation", orientation + ""); if (orientation == 6) { matrix.postRotate(90); } else if (orientation == 3) { matrix.postRotate(180); matrix.postScale((float) b.getWidth(), (float) b.getHeight()); } else if (orientation == 8) { matrix.postRotate(270); } else { } } catch (IOException e) { e.printStackTrace(); } return matrix; }

here b is your bitmap.

Your decodeSampledBitmapFromFile() method returns bitmap. Use that bitmap in Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), matrix, true); it will also gives you a bitmap return that rotated bitmap instead.

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