App Inventor Extensions

Image Metadata Extension

Note: Unfortunately this extension is not compatible with Appybuilder, see also here.

See the App Inventor Extensions document about how to use an App Inventor Extension.

For questions about this extension or bug reports please start a new thread in the App Inventor community. Thank you.

For feature requests please contact me by email. To be a sponsor of a new method already is possible starting from only 10 USD! With your contribution you will help the complete App Inventor community. Thank you.

Jan 9th, 2016: Version 1 of the Metadata Extension released for App Inventor version ai2extensions6 and Companion version 235.cdk2.

Aug 11th, 2016: Version 1a: avoid DX execution failed error: build each extension separately

Description

This extension reads the metadata of an image file. The extension uses the Metadata Extractor library from Drew Noakes. Thank you Drew! For supported file formats see here.
Required permissions: android.permission.READ_EXTERNAL_STORAGE, android.permission.WRITE_EXTERNAL_STORAGE

Methods

Get metadata from image file
Prefix the imageFileName with / (i.e. relative path) for an image file on the SD card. For instance /myImage.jpg will get the metadata of file mnt/sdcard/myImage.jpg. To get the metadata of an image file uploaded as asset packaged with an application (also works for the Companion) start the imageFileName with // (two slashes). If imageFileName starts with file:/// you can specify a complete path to the file.

Example Use

The metadata result is provided as nested list. The metadata is structured into different directories (see the highlighted directory values in the example png file). Inside each directory there are different tags and their values. You can get the value of a specific tag using the lookup in pairs block (see also below). In case you are not familiar with working with lists, this is a good opportunity to learn more about that...

• How to work with Lists by Saj
• How to work with Lists and Lists of lists (pdf) by appinventor.org
• An example of a complex List of Lists
• How does the lookup in pairs block work?

Example App: Metadata Test

Terms and Conditions

• Have fun and use this extension in your App Inventor projects! Pura Vida!
• THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
• This is is the only authorized place to download this extension. It is not allowed to host this extension somewhere else and offer it for others to download, be it on another website or market place or similar. The reason is, everybody should be able to have the opportunity to donate something in case you like my work. You are allowed to provide a link to this site, so others can download the extension here. You will find the most up to date version always here including documentation and usage examples. Thank you for your kind understanding.

Download

Download TaifunMetadata extension (aix file)
Download Metadata Test (aia file)
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This work by Pura Vida Apps is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License
with attribution (name=Pura Vida Apps and link to the source site) required.