Android: Photo Capture

Scenario

On an existing CXRLink, register an image stream callback and call takePhoto(width, height, quality) to trigger photo capture on the glasses. Receive JPEG-compressed bytes via IImageStreamCbk.onImageReceived, then decode and display the bitmap on the phone.

Prerequisites

• Same as “Audio”: relies on CXRLSampleApplication.sharedCxrLink, which is initialized and connected by the CustomView or CustomApp page.
• The glasses-side scene is built: call takePhoto only after the Custom View is opened or the Custom App has been launched via openApp (the Sample navigates here from the corresponding scene page; gating is aligned with Audio).

Key APIs

Method	Description
setCXRImageCbk(IImageStreamCbk)	Register photo result callback.
takePhoto(width: Int, height: Int, quality: Int)	The Sample uses 1024, 768, 80.

Callbacks (IImageStreamCbk)

Callback	Sample behavior
onImageReceived(data: ByteArray?)	_photoTaking=false, decodes to ImageBitmap and shows it.
onImageError(code, msg?)	Shows failure prompt and clears the image.

Constraints

• Higher resolution/quality increases transport latency and memory usage. Balance clarity vs performance for your product.
• For continuous captures, start the next capture only after the previous one completes (callback received) to avoid protocol-layer concurrency issues.
• If the link disconnects and onGlassBtConnected(false) causes _ready=false in the Sample, do not call takePhoto.

Sample reference paths

• activities/photo/PhotoUsageViewModel.kt
• activities/photo/PhotoUsageActivity.kt