How to zoom camera using Android CameraX API?

Question

I have tried to zoom camera with below code using CameraX.

First I get a Preview from CameraX and tried to perform zoom using Preview like below.

var config = CameraX.getDefaultUseCaseConfig(PreviewConfig::class.java, lensFacing)
var preview = Preview(config)
preview.zoom(zoom)

After preview.zoom() I just bind again with CameraX and get some error and it's not working.

CameraX.bindToLifecycle(this, preview, imageCapture, videoCapture)

When the above code was not working, I tried with CameraX.unbindAll() first and then I call CameraX.bindToLifecycle(). But face some error again and not get success in zoom.

Let me know how we can zoom the camera using CameraX API.

Update error log below:

Error log using only CameraX.bindToLifecycle():

java.lang.IllegalArgumentException: Exceeded max simultaneously bound image capture use cases.
   at androidx.camera.camera2.impl.UseCaseSurfaceOccupancyManager.checkUseCaseLimitNotExceeded(UseCaseSurfaceOccupancyManager.java:61)
   at androidx.camera.camera2.impl.Camera2DeviceSurfaceManager.getSuggestedResolutions(Camera2DeviceSurfaceManager.java:146)
   at androidx.camera.core.CameraX.calculateSuggestedResolutions(CameraX.java:449)
   at androidx.camera.core.CameraX.bindToLifecycle(CameraX.java:144)
   at com.android.example.cameraxbasic.fragments.CameraFragment$updateCameraUi$2.onTouch(CameraFragment.kt:408)
   at android.view.View.dispatchTouchEvent(View.java:12512)
   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
   at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3032)
   at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2719)
   at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:475)
   at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1836)
   at android.app.Activity.dispatchTouchEvent(Activity.java:3404)
   at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
   at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:433)
   at android.view.View.dispatchPointerEvent(View.java:12755)
   at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:5150)
   at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4953)
   at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4470)
   at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4523)
   at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4489)
   at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4629)
   at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4497)
   at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4686)
   at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4470)
   at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4523)
   at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4489)
   at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4497)
   at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4470)
   at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7192)
   at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7126)
   at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7087)
   at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:7295)
   at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:193)
   at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
   at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:184)
   at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:7266)
   at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:7318)
   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949)
   at android.view.Choreographer.doCallbacks(Choreographer.java:761)
   at android.view.Choreographer.doFrame(Choreographer.java:690)
   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935)
   at android.os.Handler.handleCallback(Handler.java:873)
   at android.os.Handler.dispatchMessage(Handler.java:99)
   at android.os.Looper.loop(Looper.java:193)
   at android.app.ActivityThread.main(ActivityThread.java:6912)
   at java.lang.reflect.Method.invoke(Native Method)
   at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:860)

Error log using CameraX.unbindAll() and CameraX.bindToLifecycle():

   E/Legacy-CameraDevice-JNI: getNativeWindow: Surface had no valid native window.
   E/Legacy-CameraDevice-JNI: LegacyCameraDevice_nativeDetectSurfaceDimens: Could not retrieve native window from surface.

--------- beginning of crash
   2019-05-09 16:49:29.155 31123-31144/com.android.example.cameraxbasic E/AndroidRuntime: FATAL EXCEPTION: CameraX-
Process: com.android.example.cameraxbasic, PID: 31123
java.lang.IllegalArgumentException: Surface was abandoned
    at android.hardware.camera2.utils.SurfaceUtils.getSurfaceSize(SurfaceUtils.java:84)
    at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:260)
    at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:145)
    at android.hardware.camera2.impl.CameraDeviceImpl.createCaptureSession(CameraDeviceImpl.java:518)
    at androidx.camera.camera2.impl.CaptureSession.open(CaptureSession.java:196)
    at androidx.camera.camera2.impl.Camera.openCaptureSession(Camera.java:535)
    at androidx.camera.camera2.impl.Camera$StateCallback.onOpened(Camera.java:743)
    at androidx.camera.core.CameraDeviceStateCallbacks$ComboDeviceStateCallback.onOpened(CameraDeviceStateCallbacks.java:99)
    at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:152)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:193)
    at android.os.HandlerThread.run(HandlerThread.java:65)
 Caused by: android.hardware.camera2.legacy.LegacyExceptionUtils$BufferQueueAbandonedException
    at android.hardware.camera2.legacy.LegacyExceptionUtils.throwOnError(LegacyExceptionUtils.java:73)
    at android.hardware.camera2.legacy.LegacyCameraDevice.getSurfaceSize(LegacyCameraDevice.java:606)
    at android.hardware.camera2.utils.SurfaceUtils.getSurfaceSize(SurfaceUtils.java:82)
    at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:260) 
    at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:145) 
    at android.hardware.camera2.impl.CameraDeviceImpl.createCaptureSession(CameraDeviceImpl.java:518) 
    at androidx.camera.camera2.impl.CaptureSession.open(CaptureSession.java:196) 
    at androidx.camera.camera2.impl.Camera.openCaptureSession(Camera.java:535) 
    at androidx.camera.camera2.impl.Camera$StateCallback.onOpened(Camera.java:743) 
    at androidx.camera.core.CameraDeviceStateCallbacks$ComboDeviceStateCallback.onOpened(CameraDeviceStateCallbacks.java:99) 
    at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:152) 
    at android.os.Handler.handleCallback(Handler.java:873) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:193) 
    at android.os.HandlerThread.run(HandlerThread.java:65) 


--------- beginning of system

I think both approaches are wrong. You need to call `unbindAll()`, because you call `bindToLifecycle()` often. But that cleans up the use cases. Reusing these might not work well (yet). Have you tried calling `preview.zoom()` without rebinding anything? — tynn, May 11 '19 at 06:23
@tynn, I have tried `preview.zoom()` without rebinding but nothing happens. — Patel Pinkal, May 13 '19 at 06:05

Patel Pinkal · Accepted Answer · 2020-01-28T09:15:13.080

Finally, we get the Zoom API in CameraX. Please check below two way which you can use to zoom the preview of camera.

Pinch to zoom:

val scaleGestureDetector = ScaleGestureDetector(context, listener)

cameraTextureView.setOnTouchListener { _, event ->
    scaleGestureDetector.onTouchEvent(event)
    return@setOnTouchListener true
}

val listener = object : ScaleGestureDetector.SimpleOnScaleGestureListener() {
    override fun onScale(detector: ScaleGestureDetector): Boolean {
        val scale = cameraInfo.zoomRatio.value * detector.scaleFactor
        cameraControl.setZoomRatio(scale)
        return true
    }
}

Slide to zoom(using seekbar):

zoomSeekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {        
    override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
        cameraControl.setLinearZoom(progress / 100.toFloat())
    }

    override fun onStartTrackingTouch(seekBar: SeekBar?) {}

    override fun onStopTrackingTouch(seekBar: SeekBar?) {}
})

Use below to get cameraControl:

val cameraControl = CameraX.getCameraControl(lensFacing)

Code reference link: https://github.com/Pinkal7600/camera-samples/tree/master/CameraXBasic

@SuyogDorlikar, Please check my edited google code sample which is working for zoom. I added the code sample link at the bottom of my answer. — Patel Pinkal, Jan 28 '20 at 09:16

score 5 · Answer 2 · answered Feb 29 '20 at 16:55

This is what I did on the latest CameraX 1.0.0-beta01 sample project. Added to bottom of onViewCreated

val listener = object : ScaleGestureDetector.SimpleOnScaleGestureListener() {
override fun onScale(detector: ScaleGestureDetector): Boolean {
    val scale = camera!!.cameraInfo.zoomState.value!!.zoomRatio * detector.scaleFactor
        camera!!.cameraControl.setZoomRatio(scale)
        return true
    }
}

val scaleGestureDetector = ScaleGestureDetector(context, listener)

viewFinder.setOnTouchListener { _, event ->
    scaleGestureDetector.onTouchEvent(event)
    return@setOnTouchListener true
}

score 3 · Answer 3 · answered May 14 '19 at 09:44

3

For zoom to work properly, you also need to call zoom() after bindToLifecycle(). Also note that zoom() accepts a Rect which is in sensor coordinate. see here for more details.

You may also need to use camera2 API to get the sensor active array and get the camera id (please use the first camera id that has the correct LENS_FACING). We know these are a lot of works so we are developing a new higher level zoom API that is much easier and simpler to use.

answered May 14 '19 at 09:44

Scott Nien

51
1

Thanks for your answer. I have tried zoom() after bindToLifecycle() with passing Rect in zoom method but didn't get any output. But Still, I will try with Camera2 API as you mention. Hope I'll get any output with camera zoom. – Patel Pinkal May 16 '19 at 05:45
As you told you are developing new level zoom API which will be simple and easy. So, It will be different then what we work for zoom currently with the camera and camera2 API? – Patel Pinkal May 16 '19 at 05:48
Yes, the new zoom API will be different from camera1 and camera2 API. – Scott Nien May 17 '19 at 06:32
Ok, Thanks. We are waiting for that. – Patel Pinkal May 17 '19 at 09:04

score 0 · Answer 4 · answered May 14 '19 at 00:13

It looks like the error is unrelated to preview zoom: java.lang.IllegalArgumentException: Exceeded max simultaneously bound image capture use cases.

This indicates that you are calling CameraX.bindToLifecycle(imageCapture) more than once before unbinding it, and that is what is causing the crash. I would also recommend using the configuration builders instead of getDefaultUseCaseConfig, since they are more explicit and easier to read and getDefaultUseCaseConfig is a hidden API.

Please refer to the official sample for an example implementation and the documentation for more details.

Thanks for the answer but it didn't help me because I have done this zoom code by my own with help of official sample code from GitHub and there is no any kind of documentation where they mention about camera zoom using CameraX. Please let me know how to zoom? if you have any idea about this. — Patel Pinkal, May 14 '19 at 05:42

score 0 · Answer 5 · edited Mar 06 '23 at 11:01

  ScaleGestureDetector.OnScaleGestureListener listener = new ScaleGestureDetector.OnScaleGestureListener() {
            @Override
            public boolean onScale(ScaleGestureDetector scaleGestureDetector) {
                ZoomState f = cam1.getCameraInfo().getZoomState().getValue();
                Log.d("Zoom", String.valueOf(f.getZoomRatio()));

                float scale = scaleGestureDetector.getScaleFactor();
                cam1.getCameraControl().setZoomRatio(scale * f.getZoomRatio());
                return true;
            }

            @Override
            public boolean onScaleBegin(ScaleGestureDetector scaleGestureDetector) {

                return true;
            }

            @Override
            public void onScaleEnd(ScaleGestureDetector scaleGestureDetector) {

            }
        };
        ScaleGestureDetector scaleGestureDetector = new ScaleGestureDetector(getApplicationContext(), listener);

        previewView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                return scaleGestureDetector.onTouchEvent(motionEvent);

            }
        });

As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). — Community, Mar 06 '23 at 11:02
1-create the object of "ScaleGestureDetector.OnScaleGestureListener" , it will listen to the screen touching/pinching. 2- make a object of ScaleGestureDetector 3- then set touch listener on preview "scaleGestureDetector.onTouchEvent(motionEvent);" — risabvishwakarma, Apr 03 '23 at 20:18

score -1 · Answer 6 · answered Oct 14 '19 at 05:36

-1

I am able to do zoom in/out using this code

val my = Rect(left, top, right, bottom)
preview.zoom(my)

see full-example on github and just check my answer

It's perfectly working for me.

answered Oct 14 '19 at 05:36

Akshay Raiyani

1,243
9
21

How to zoom camera using Android CameraX API?

6 Answers6

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