Android Question cameraexclass startpreview failed

[heldenssjoerd]

We're using cameraexclass version 1.30.

Executing the following shows the taken picture perfect on a panel

Sub oOk_Click
    Log("Ok")
    oOk.Visible = False
    oOpnieuw.Enabled=False
    oOk.Enabled = False
    Panel1.Visible=False
    Panel1.Enabled=False
    CallSub3(Main,"ShowProgressDialog","Bezig met opslaan...",False)
    Panel2.enabled = True
    Panel2.Visible = True
    camEx.TakePicture
'    Sleep(1)
    oOpnieuw.Enabled=True
    Log("Ok Done")
End Sub

Sub oOpnieuw_Click
    Log("Opnieuw")
    oOk.Enabled=False 'setting other buttons to false so there can't be any action from those.
    oOpnieuw.Enabled=False
    oImageView.Color = Colors.Black
    Panel1.Visible=True
    Panel1.Enabled=True
   
    oVorige.Visible = True
    oVorige.Enabled = True
   
    Panel2.enabled = False
    Panel2.Visible = False
   
    camEx.StartPreview 'fails at this point
    oOk.Visible = True
    oOk.Enabled = True
    Log("OpnieuwDone")
End Sub

The button OK is pressed when you're ok with the given preview.
When it's for some reaseon not ok you can press "oOpnieuw" and then you can see the preview again.

However sometimes when quickly pushing buttons we're getting an error on the startPreview from within the class. See below.

java.lang.RuntimeException: startPreview failed
    at android.hardware.Camera.startPreview(Native Method)
    at anywheresoftware.b4a.objects.CameraW.StartPreview(CameraW.java:177)
    at lmmobile.jds.android.cameraexclass._startpreview(cameraexclass.java:1530)
    at lmmobile.jds.android.lm_main_foto._oopnieuw_click(lm_main_foto.java:1413)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:213)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:197)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
    at android.view.View.performClick(View.java:7252)
    at android.view.View.performClickInternal(View.java:7229)
    at android.view.View.access$3500(View.java:821)
    at android.view.View$PerformClick.run(View.java:27765)
    at android.os.Handler.handleCallback(Handler.java:914)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:224)
    at android.app.ActivityThread.main(ActivityThread.java:7560)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)

 

[Erel]

You can catch this error with Try / Catch and show a message to the user.