- callback
- the new callback to send camera availability notices to
- handler
- The handler on which the callback should be invoked, or null to use the current thread's Android.OS.Looper.
Register a callback to be notified about camera device availability.
Registering the same callback again will replace the handler with the new one provided.
The first time a callback is registered, it is immediately called with the availability status of all currently known camera devices.