This is the Android app for Columbus. It lives on users' Android phones and collects data every three minutes. Data is uploaded only on Wi-Fi.
The app collects the following data:
- Image (front-facing camera)
- 10-second sound clip (microphone)
- Location (mobile triangulation)
The image and sound files are uploaded to an Amazon S3 bucket. When all of the above data has been collected, the app submits a JSON string to the backend server, similar to the following:
{
"timestamp": 12345,
"account_id": "abc@gmail.com",
"location": {
"lat": 200,
"lon": 1
},
"audio_url": "abc@gmail.com/12345/audio.aac",
"image_url": "abc@gmail.com/12345/image.jpg"
}audio_url and image_url - S3 key to the media assets
The app will only use the network if the phone is connected to Wi-Fi. If there is no Wi-Fi connection at the time of data collection, the upload job will be queued for later until Wi-Fi is available.
Libraries used:
- loopj HTTP library
- Google GSON library
- AWS Android SDK