Android Question Image Metadata Saving/Retrieving... it's martian to me... I need someone to point me back to Earth!

[Cableguy]

Hi guys,

It's been a while...

I'm in early stages of defining features for a GPS Camera Tag App.
I have decided to create such an app because the ones I have tried are either feature "bankrupted" or keep stealing the main purpose of the app by showing way too many ads!
So, amidst some of the features I want to include, is a floating panel above the camera image that will hold GPS info... But, What if I don't ant to show such panel but still save the GPS info?
So I started looking and googling at what MetaData and EXIF Data are, how to work with them, best practices and common standarts.... And its all Martian to me!!!
I understand that the most common way if to use a Json data tree... that parts, I think I can manage... but... how do I combine the camera image and this info?
Does it go in the end of the file, in the begining, does it need a header, etc?
I want to be able to load back into my app an image (jpg) saved by my app, with such info into it, and have the app show it back in the GPS floating panel...
Can anyone point me back to Earth?

 

[agraham]

JpegUtils library gives access to Exif data

This library contains an ExifData object that allows you to read and write the EXIF data in a Jpeg file. It is a very thin wrapper over the Android ExifInterface class.

www.b4x.com

or more recently

Android Support ExifInterface

This is a wrap for the Android Support ExifInterface announced here ExifInterface4a Author: DonManfred (wrapper) Version: 1.3 ExifInterface Fields: exifAttributesAPI9 As java.lang.String[] exifAttributesAPI11 As java.lang.String[] exifOrientationConstants As int[] exifAttributesAPI23 As...

www.b4x.com

 

[Cableguy]

Hi Andrew,

So, if I understand correctly, when I do a "set" property, it writes if to the image file, no more extra manipulation needed, right?

 

[agraham]

With my library you call Initialize which opens the file, you then use get and set on the attributes and when finished call saveAttributes to write a new file with the attributes and delete the old one. See the comments in the library XML file.

 

[Cableguy]

I can see Earth now, Thanks!!

 

[agraham]

Beware that, if I remember correctly, the GPS co-ordinates are saved in a strange format in EXIF tags.

Exif Data showing strange numbers

Hi all I am using Andrew Graham's code and I read through the old thread that showed some strange outputs I also have strange outputs but different to those listed in the thread I am getting Latitude data as 51/1,40/1,23428/1000 Longitude Data as 116/1,26/1,59454 I THINK the data should...

www.b4x.com

Some experimentation may be needed so don't use it on imporant images till you are sure it works.

 

[Cableguy]

Beware that, if I remember correctly, the GPS co-ordinates are saved in a strange format in EXIF tags.

Exif Data showing strange numbers

Hi all I am using Andrew Graham's code and I read through the old thread that showed some strange outputs I also have strange outputs but different to those listed in the thread I am getting Latitude data as 51/1,40/1,23428/1000 Longitude Data as 116/1,26/1,59454 I THINK the data should...

www.b4x.com

Some experimentation may be needed so don't use it on imporant images till you are sure it works.

Thanks for the heads up!

 

[Cableguy]

Posting this here for future notice!

https://gis.stackexchange.com/quest...if-gps-information-to-lat-lng-decimal-numbers

https://www.ridgesolutions.ie/index.php/2015/03/05/geotag-exif-gps-latitude-field-format/