Photo picker. Portrait turns to landscape

问题:

How to pick an image from gallery (SD Card) for my app?

I have implemented the second answer (With the downsampling). When I select an image in portrait, the image will be shown in landscape mode.. Does anybody know why this is? And how to fix this? Thanks in advance!

P.s. Sorry I've made a new topic out of this but the poster protected his topic against newbies like me :)

回答1:

You have to get the exif rotation of the pic, like this and arrange youur bitmap accordingly

public static int getExifRotation(String imgPath) 
{
    try 
    {
        ExifInterface exif = new ExifInterface(imgPath);
        String rotationAmount = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
        if (!TextUtils.isEmpty(rotationAmount)) 
        {
            int rotationParam = Integer.parseInt(rotationAmount);
            switch (rotationParam) 
            {
                case ExifInterface.ORIENTATION_NORMAL:
                    return 0;
                case ExifInterface.ORIENTATION_ROTATE_90:
                    return 90;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    return 180;
                case ExifInterface.ORIENTATION_ROTATE_270:
                    return 270;
                default:
                    return 0;
            }
        } 
        else 
        {
            return 0;
        }
    }
    catch (Exception ex) 
    {
        return 0;
    }
}

get the path of the picture

public String getPath(Uri uri) {
    String[] projection = { MediaStore.Images.Media.DATA };
    Cursor cursor = managedQuery(uri, projection, null, null, null);
    int column_index = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

Thin make a matrix and use bitmap constructor that uses matrix

Matrix matrix = new Matrix();
matrix.preRotate(90); 
// or
matrix.postRotate(90);

so inside your onActivityResult you should have something like this

 Uri selectedImageUri = data.getData();

                selectedImagePath = getPath(selectedImageUri);
                orientation = getExifRotation(selectedImagePath);


                Matrix matrix = new Matrix();
                matrix.postRotate(90);
               if(orientation == 90){
                   bitmap = Bitmap.createBitmap(bitmap, 0, 0, 
                            bitmap.getWidth(), bitmap.getHeight(), 
                            matrix, true);}

make sure you resample your image first though, so how he has it in his answer first and then do this