如何为在cameraX中完成的焦点添加监听器

Question

I am trying to implement manual focus on CameraX. but i don't know how to check that where startFocusAndMetering completed or not.

I tried something like this

 val focusListenableFuture = camera?.cameraControl?.startFocusAndMetering(action)

I found that there is a method isDone() which can check weather focusing completed or not

how can i use it with focusListenableFuture?.addListener() to listen weather focusing completed or not

Answer 1

You can use FocusMeteringResult#isFocusSuccessful() :

Returns if auto focus is successful.

If AF is requested in FocusMeteringAction but current camera does not support AF, it will return true. If AF is not requested, it will return false.

val focusListenableFuture  = camera?.cameraControl?.startFocusAndMetering(action)
focusListenableFuture.addListener( {
    val result = focusListenableFuture.get()
    val isSuccessful = result.isFocusSuccessful
}, ContextCompat.getMainExecutor(context))