camera zooming

[danoptic]

Is that possible to zoom using any camera library?
please give me an example
Dan

 

[Erel]

You can add these 3 methods to CameraEx class:

Public Sub IsZoomSupported As Boolean
   r.target = parameters
   Return r.RunMethod("isZoomSupported")
End Sub
Public Sub GetMaxZoom As Int
   r.target = parameters
   Return r.RunMethod("getMaxZoom")
End Sub

Public Sub SetZoom(Zoom As Int)
   r.target = parameters
   r.RunMethod2("setZoom", Zoom, "java.lang.int")
End Sub

 

[danoptic]

getfocusdistances

Can you tell me how to add getfocusdistances to cameraEx class?
Thank you

 

[Erel]

Note that it is better to start a new thread for a new question.

You can use this code:

Public Sub GetFocusDistances As Float()
   Dim f(3) As Float
   r.Target = parameters
   r.RunMethod4("getFocusDistances", Array As Object(f), Array As String("[F"))
   Return f
End Sub

'call it
Dim f() As Float = camEx.GetFocusDistances
Log(f(0) & ", " & f(1) & ", " & f(2))

Seems like many devices doesn't support it properly:
Issue 14341 - android - Distances returned by Camera.Parameters.getFocusDistances() do not change on Nexus S regardless of actual focus distance - Android - An Open Handset Alliance Project - Google Project Hosting

 

[cluster1]

how to call function GetMaxZoom ?

 

[Erel]

Have you added the methods to CameraEx class?

 

[cluster1]

ya, i have already added to method CameraEx class
e g :

Sub btnZoomin_Click
ToastMessageShow("Zoom in",True)
CamEx.GetMaxZoom
End Sub

but it's does'nt work

 

[Erel]

In which way it doesn't work? This method returns the maximum allowed value. It will not change the zoom.

 

[cluster1]

then how to call the function?

 

[Erel]

I'm sorry but I don't understand what you are trying to implement.

 

[udg]

Hi cluster1,
are you looking for a way to start zooming on a button click? If yes, please find below some example code based on your own and what it is in post #2

Sub btnZoomin_Click
  if CamEx.IsZoomSuported then
    dim maxZ as int
    maxZ = CamEx.GetMaxZoom
    CamEx.SetZoom(maxZ)
  else
     ToastMessageShow("Sorry, unable to zoom",True)
  end if
End Sub

udg

 

[吳界明]

I use the ZOOM method to do zoom in/out , but the scene of camera not becoming larger or smaller.
Who can provides the camera zooming example for me, thanks.

 

[吳界明]

I want to use a seekbar (- to +) to show the ZOOM image of camera scene
Is there a example for me??

 

[Erel]

Please do not make duplicate posts.

 

[吳界明]

Yes, I can use the zooming control, but when I execute the FocusAndTakePicture method, then the procedure will break and throw the exception error about autofocus
I think that is the java error when I use the cameraExclass


Public Sub FocusAndTakePicture
cam.AutoFocus
End Sub

 

[吳界明]

** Activity (main) Pause, UserClosed = true **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
Error occurred on line: 316 (cameraexclass)
java.lang.NullPointerException
at anywheresoftware.b4a.objects.CameraW.AutoFocus(CameraW.java:191)
at Insert.water.gov.cameraexclass._focusandtakepicture(cameraexclass.java:534)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:636)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:302)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:238)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:121)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:158)
at Insert.water.gov.main.afterFirstLayout(main.java:104)
at Insert.water.gov.main.access$100(main.java:16)
at Insert.water.gov.main$WaitForLayout.run(main.java:76)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5050)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:780)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:596)
at dalvik.system.NativeStart.main(Native Method)

 

[Erel]

Do you get this error when you run the example that comes with CameraEx class?

 

[吳界明]

Yes, comes from the CameraEx class (Focusandtakepicture method)

 

[Erel]

Try to run the example as is and see if it works. Check the unfiltered logs.