Camera remains active when not on 'Scan' scene

[wolverineks]

Problem:
When navigating away from the 'Scan' scene or in background mode, the camera component remains active + scanning.

Effects:

• drains battery
• scans when the user doesn't expect it
• crashes when returning to the scan scene a second time

Causes:

• React Native Router Flux does not unmount a scene when navigating to a new scene

Possible Fixes:

• Add conditional rendering of the camera which includes the current scene and background mode
  • Upsides:
    • complete fix
    • current best practice
  • Downsides:
    • requires checking background mode
    • must remount on each navigation to the 'Scan' scene, this is slow
  • Mitigation:
    • Throw up a spinner

Further Research

• Look into React Native Camera pausing the camera component
• Look into Android Native pausing camera preview

react-native-camera issue 556
react-native-camera issue 460
react-native-camera issue 357

[wolverineks]

This behavior is expected.

Fix:
Attempt to mount the camera component on first app load.
Attempt to keep camera mounted at all times.
Throw away camera scans when not on the Scan scene.

[paullinator]

No longer an issue. We keep camera active but properly reuse the same instance when returning to camera scene. Closing