B4A Library [Class] CameraEx - Extends the camera library functionality

Erel · Nov 28, 2012

Example based on B4XPages: https://www.b4x.com/android/forum/threads/b4x-b4xpages-barcode-reader.120417/#content

CameraEx class wraps the Camera object and using reflection and other code it extends its functionality.

CameraEx class requires Android 2.3+ and depends on Camera library v2.20+
CameraEx features:

Easily open the back or front camera
Preview images and saved images orientation will match the device orientation (all orientations are supported)
Gives access to Camera.Parameters native class (flashmode, picture size, effects and other settings)
Includes methods to convert preview images to JPEG and to save the taken pictures.
It should be simple to add more methods to this class

See this page for the constant values and other possible methods:
https://developer.android.com/reference/android/hardware/Camera.Parameters.html

Note that you should call CommitParameters after changing one or more parameters.

CameraExClass module is included in the attached example.

V1.30 is attached - Includes various new methods.

v1.20 - Includes all the various posts in this thread as well as AutoFocusAndTakePicture method which first calls AutoFocus and then takes a picture (if AutoFocus was successful).

Edit (06/2018): A new version was uploaded with targetSdkVersion set to 26.

Adam888 · Oct 6, 2013

Hi, Erel,

If I want to mirror the front camera in preview mode (not take picture and post process),How can I do ?

Thanks

Erel · Oct 6, 2013

The picture should already be mirrored.

Adam888 · Oct 6, 2013

Yes, Sure
So , I need to mirror again.
Can you tell me how to do that? Thank you very much.

Erel · Oct 6, 2013

You need to modify SetDisplayOrientation in CameraEx class.

Adam888 · Oct 6, 2013

Thank you, I modify SetDisplayOrientation , and my program can rotate the preview.
Could you please tell me how to mirror in x axis (horizontal flip)?

ednt · Oct 6, 2013

I test the new Version 3.00 BETA 1 with the Camera Example.

The Autofocus do not work with the new Version.
The Android Appliaction is complete Stoping.

Only Picture withous Foucs is working.
Someone with the same issue ?

i try the CameraEX.zip & CameraEX_JB.zip example with a Samsung SII Device.

Erel · Oct 7, 2013

@Adam888, Try to add 180 or 90 to the orientation.

See these two methods:
http://developer.android.com/reference/android/hardware/Camera.Parameters.html#setRotation(int)
http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)

@ednt I don't think that it is related to v3.00 (unless it only happens in rapid debug mode).

Adam888 · Oct 7, 2013

Hi Erel,

Sorry, the two methods still rotation only.
Please refer to attached picture. I want to flip the picture in preview mode.

Does the panel object can flip with camera?

Thank you

Erel · Oct 7, 2013

You will not be able to flip the panel. These two methods are the only relevant methods available.

Adam888 · Oct 7, 2013

How can I use these two methods to flip preview like the picture which I posted?

Erel · Oct 7, 2013

The setDisplayOrientation method will not help here. You can manually flip the preview image and show it on a different view.

Adam888 · Oct 7, 2013

OK. manually flip is the last method.
Thank you.

Erel · Oct 7, 2013

You will probably need to skip some of the frames. See CCTV for an example.

Adam888 · Oct 7, 2013

Oh, Yes, That's good idea. Thank you very much.

aeropic · Nov 4, 2013

Hi Erel,

Based on CameraEx and Jim Brown's v1.21 excellent work, I've added my modest contribution to CameraEx class

Additional subs added:

getExposureCompensationStep
Gets the exposure compensation Step.
Applications can get EV by multiplying the exposure compensation index AND Step. Ex: If exposure compensation index Is -6 AND Step Is 0.333333333, EV Is -2

getExposureCompensation
Gets the current exposure compensation index.
The range Is getMinExposureCompensation() To getMaxExposureCompensation(). 0 means exposure Is Not adjusted.
getMaxExposureCompensation
Gets the maximum exposure compensation index.
maximum exposure compensation index (>=0). If both this method AND getMinExposureCompensation() Return 0, exposure compensation Is Not supported.
getMinExposureCompensation
Gets the minimum exposure compensation index.
minimum exposure compensation index (<=0). If both this method AND getMaxExposureCompensation() Return 0, exposure compensation Is Not supported.
setExposureCompensation (Int value)

Also the Camera_LogFeatures added by Jim is modified to include this :

Exposure compensation options________
Expo step : 0.5
Expo compensation : 0
Expo compensation min : -4
Expo compensation Max : 4

Everything has been tested and works fine on my Galaxy S3

I intend to introduce this inside my CameraUnlock application but this is another story ! http://www.b4x.com/android/forum/threads/camera-unlock.34156/

Bye
Alain

jim0406 · Nov 27, 2013

Hi,
can i use the camera.lib and cameraex.lib with Nikon Coolpix S800c Camera?
(from tech specs:
The S800c is a full Android 2.3 (known as Gingerbread) device, meaning it can run any apps that an equivalent smartphone could offer - so you can run Photoshop Express to spruce-up your images, rather than being dependent on the manufacturer-supplied processing options. For that matter, there's nothing to stop you passing the time with a quick game of Temple Run or Fruit Ninja. You'll control all of this on the camera's 3.5" touchscreen OLED display)

thank you

Erel · Nov 28, 2013

If the camera behaves like a standard Android camera then it should work.

ChrShe · Jan 4, 2014

I'm getting NoSuchFieldError from the SetDisplayOrientation that gets called.
I should say that this is in the emulator. Unfortunately, currently that is my only option for testing code...So I don't know if it happens on a real device.

It's failing here:

B4X:

Private Sub SetDisplayOrientation
    r.Target = r.GetActivity
...
...

Here's what the log comes up with:

B4X:

** Activity (actnewmed) Resume **
cameraexclass_setdisplayorientation (B4A line: 92)
r.Target = r.GetActivity
java.lang.NoSuchFieldError: anywheresoftware.b4a.BA.activityBA
    at anywheresoftware.b4a.agraham.reflection.Reflection.GetActivity(Reflection.java:638)
    at com.MyRXList.shenarsoft.cameraexclass._setdisplayorientation(cameraexclass.java:889)
    at com.MyRXList.shenarsoft.cameraexclass._camera_ready(cameraexclass.java:153)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:167)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:151)
    at anywheresoftware.b4a.objects.CameraW$2$1.run(CameraW.java:139)
    at android.os.Handler.handleCallback(Handler.java:605)
    at android.os.Handler.dispatchMessage(Handler.java:92)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4424)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
    at dalvik.system.NativeStart.main(Native Method)

Any ideas?

Erel · Jan 5, 2014

Which version of B4A are you using? Seems like you are using an old version of Reflection library.

ChrShe · Jan 5, 2014

I thought the latest...but Reflection is version 1.90.

I'll double check my versions and report back...Thank you!

B4A Library [Class] CameraEx - Extends the camera library functionality

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